Agenda packet — Beaumont City Council, June 17, 2025 (part 3 of 21)

Point rain (area averaged) = 2.710(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 2.710(In)
Sub -Area Data:

Area(Ac.)

1.340
Runoff Index

32.00 Impervious %

0.788
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F
AMC2 AMC -1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

32.0 16.2 0.870 0.788 0.253 1.000 0.253
Sum (F) = 0.253
Area averaged mean soil loss (F) (In/Hr) = 0.253
Minimum soil loss rate ((In/Hr)) = 9.126
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.269
Unit Hydrograph
DESERT S -Curve
Unit Hydrograph Data
Unit time period Time % of lag Distribution Unit Hydrograph (hrs)
Graph % (CFS)
1 0.083 829.542
100.000 1.350
Sum = 100.000 Sum= 1.350
The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain
(Hr.) Percent (In/Hr)
1 0.08 0.07 0.022
2 0.17 0.07 0.022
3 0.25 0.07 0.022
4 0.33 0.10 0.033
5 0.42 0.10 0.033
6 0.50 0.10 0.033
7 0.58 0.10 0.033
8 0.67 0.10 0.033
9 0.75 0.10 0.033
10 0.83 0.13 0.043
11 0.92 0.13 0.043
12 1.00 0.13 0.043
13 1.08 0.10 0.033
14 1.17 0.10 0.033
15 1.25 0.10 0.033
16 1.33 0.10 0.033
17 1.42 0.10 0.033
18 1.50 0.10 0.033
19 1.58 0.10 0.033
20 1.67 0.10 0.033
21 1.75 0.10 0.033
22 1.83 0.13 0.043
23 1.92 0.13 0.043
24 2.00 0.13 0.043
Loss rate(In./Hr)
Max
( 0.448)
( 0.446)
( 0.445)
( 0.443)
( 0.441)
( 0.440)
( 0.438)
( 0.436)
( 0.434)
( 0.433)
( 0.431)
( 0.429)
( 0.428)
( 0.426)
( 0.424)
( 0.422)
( 0.421)
( 0.419)
( 0.417)
( 0.416)
( 0.414)
( 0.412)
( 0.411)
( 0.409)
Low

0.006

0.009

0.012

0.009

0.012

0.012
Effective
(In/Hr)

0.016

0.024

0.032

0.024

0.032

Page 269 of 2775 ends

25 2.08 0.13 0.043 ( 0.407) 0.012 0.032
26 2.17 0.13 0.043 ( 0.406) 0.012 0.032
27 2.25 0.13 0.043 ( 0.404) 0.012 0.032
28 2.33 0.13 0.043 ( 0.403) 0.012 0.032
29 2.42 0.13 0.043 ( 0.401) 0.012 0.032
30 2.50 0.13 0.043 ( 0.399) 0.012 0.032
31 2.58 0.17 0.054 ( 0.398) 0.015 0.040
32 2.67 0.17 0.054 ( 0.396) 0.015 0.040
33 2.75 0.17 0.054 ( 0.394) 0.015 0.040
34 2.83 0.17 0.054 ( 0.393) 0.015 0.040
35 2.92 0.17 0.054 ( 0.391) 0.015 0.040
36 3.00 0.17 0.054 ( 0.390) 0.015 0.040
37 3.08 0.17 0.054 ( 0.388) 0.015 0.040
38 3.17 0.17 0.054 ( 0.386) 0.015 0.040
39 3.25 0.17 0.054 ( 0.385) 0.015 0.040
40 3.33 0.17 0.054 ( 0.383) 0.015 0.040
41 3.42 0.17 0.054 ( 0.381) 0.015 0.040
42 3.50 0.17 0.054 ( 0.380) 0.015 0.040
43 3.58 0.17 0.054 ( 0.378) 0.015 0.040
44 3.67 0.17 0.054 ( 0.377) 0.015 0.040
45 3.75 0.17 0.054 ( 0.375) 0.015 0.040
46 3.83 0.20 0.065 ( 0.374) 0.017 0.048
47 3.92 0.20 0.065 ( 0.372) 0.017 0.048
48 4.00 0.20 0.065 ( 0.370) 0.017 0.048
49 4.08 0.20 0.065 ( 0.369) 0.017 0.048
50 4.17 0.20 0.065 ( 0.367) 0.017 0.048
51 4.25 0.20 0.065 ( 0.366) 0.017 0.048
52 4.33 0.23 0.076 ( 0.364) 0.020 0.055
53 4.42 0.23 0.076 ( 0.363) 0.020 0.055
54 4.50 0.23 0.076 ( 0.361) 0.020 0.055
55 4.58 0.23 0.076 ( 0.359) 0.020 0.055
56 4.67 0.23 0.076 ( 0.358) 0.020 0.055
57 4.75 0.23 0.076 ( 0.356) 0.020 0.055
58 4.83 0.27 0.087 ( 0.355) 0.023 0.063
59 4.92 0.27 0.087 ( 0.353) 0.023 0.063
60 5.00 0.27 0.087 ( 0.352) 0.023 0.063
61 5.08 0.20 0.065 ( 0.350) 0.017 0.048
62 5.17 0.20 0.065 ( 0.349) 0.017 0.048
63 5.25 0.20 0.065 ( 0.347) 0.017 0.048
64 5.33 0.23 0.076 ( 0.346) 0.020 0.055
65 5.42 0.23 0.076 ( 0.344) 0.020 0.055
66 5.50 0.23 0.076 ( 0.343) 0.020 0.055
67 5.58 0.27 0.087 ( 0.341) 0.023 0.063
68 5.67 0.27 0.087 ( 0.340) 0.023 0.063
69 5.75 0.27 0.087 ( 0.338) 0.023 0.063
70 5.83 0.27 0.087 ( 0.337) 0.023 0.063
71 5.92 0.27 0.087 ( 0.335) 0.023 0.063
72 6.00 0.27 0.087 ( 0.334) 0.023 0.063
73 6.08 0.30 0.098 ( 0.332) 0.026 0.071
74 6.17 0.30 0.098 ( 0.331) 0.026 0.071
75 6.25 0.30 0.098 ( 0.329) 0.026 0.071
76 6.33 0.30 0.098 ( 0.328) 0.026 0.071
77 6.42 0.30 0.098 ( 0.326) 0.026 0.071
78 6.50 0.30 0.098 ( 0.325) 0.026 0.071
79 6.58 0.33 0.108 ( 0.323) 0.029 0.079
80 6.67 0.33 0.108 ( 0.322) 0.029 0.079
81 6.75 0.33 0.108 ( 0.320) 0.029 0.079
82 6.83 0.33 0.108 ( 0.319) 0.029 0.079
83 6.92 0.33 0.108 ( 0.318) 0.029 0.079
84 7.00 0.33 0.108 ( 0.316) 0.029 0.079
85 7.08 0.33 0.108 ( 0.315) 0.029 0.079
86 7.17 0.33 0.108 ( 0.313) 0.029 0.079
87 7.25 0.33 0.108 ( 0.312) 0.029 0.079

Page 270 of 2775 ends

88 7.33 0.37 0.119 ( 0.310) 0.032 0.087
89 7.42 0.37 0.119 ( 0.309) 0.032 0.087
90 7.50 0.37 0.119 ( 0.308) 0.032 0.087
91 7.58 0.40 0.130 ( 0.306) 0.035 0.095
92 7.67 0.40 0.130 ( 0.305) 0.035 0.095
93 7.75 0.40 0.130 ( 0.303) 0.035 0.095
94 7.83 0.43 0.141 ( 0.302) 0.038 0.103
95 7.92 0.43 0.141 ( 0.301) 0.038 0.103
96 8.00 0.43 0.141 ( 0.299) 0.038 0.103
97 8.08 0.50 0.163 ( 0.298) 0.044 0.119
98 8.17 0.50 0.163 ( 0.296) 0.044 0.119
99 8.25 0.50 0.163 ( 0.295) 0.044 0.119
100 8.33 0.50 0.163 ( 0.294) 0.044 0.119
101 8.42 0.50 0.163 ( 0.292) 0.044 0.119
102 8.50 0.50 0.163 ( 0.291) 0.044 0.119
103 8.58 0.53 0.173 ( 0.290) 0.047 0.127
104 8.67 0.53 0.173 ( 0.288) 0.047 0.127
105 8.75 0.53 0.173 ( 0.287) 0.047 0.127
106 8.83 0.57 0.184 ( 0.285) 0.050 0.135
107 8.92 0.57 0.184 ( 0.284) 0.050 0.135
108 9.00 0.57 0.184 ( 0.283) 0.050 0.135
109 9.08 0.63 0.206 ( 0.281) 0.055 0.151
110 9.17 0.63 0.206 ( 0.280) 0.055 0.151
111 9.25 0.63 0.206 ( 0.279) 0.055 0.151
112 9.33 0.67 0.217 ( 0.277) 0.058 0.158
113 9.42 0.67 0.217 ( 0.276) 0.058 0.158
114 9.50 0.67 0.217 ( 0.275) 0.058 0.158
115 9.58 0.70 0.228 ( 0.273) 0.061 0.166
116 9.67 0.70 0.228 ( 0.272) 0.061 0.166
117 9.75 0.70 0.228 ( 0.271) 0.061 0.166
118 9.83 0.73 0.238 ( 0.270) 0.064 0.174
119 9.92 0.73 0.238 ( 0.268) 0.064 0.174
120 10.00 0.73 0.238 ( 0.267) 0.064 0.174
121 10.08 0.50 0.163 ( 0.266) 0.044 0.119
122 10.17 0.50 0.163 ( 0.264) 0.044 0.119
123 10.25 0.50 0.163 ( 0.263) 0.044 0.119
124 10.33 0.50 0.163 ( 0.262) 0.044 0.119
125 10.42 0.50 0.163 ( 0.261) 0.044 0.119
126 10.50 0.50 0.163 ( 0.259) 0.044 0.119
127 10.58 0.67 0.217 ( 0.258) 0.058 0.158
128 10.67 0.67 0.217 ( 0.257) 0.058 0.158
129 10.75 0.67 0.217 ( 0.255) 0.058 0.158
130 10.83 0.67 0.217 ( 0.254) 0.058 0.158
131 10.92 0.67 0.217 ( 0.253) 0.058 0.158
132 11.00 0.67 0.217 ( 0.252) 0.058 0.158
133 11.08 0.63 0.206 ( 0.251) 0.055 0.151
134 11.17 0.63 0.206 ( 0.249) 0.055 0.151
135 11.25 0.63 0.206 ( 0.248) 0.055 0.151
136 11.33 0.63 0.206 ( 0.247) 0.055 0.151
137 11.42 0.63 0.206 ( 0.246) 0.055 0.151
138 11.50 0.63 0.206 ( 0.244) 0.055 0.151
139 11.58 0.57 0.184 ( 0.243) 0.050 0.135
140 11.67 0.57 0.184 ( 0.242) 0.050 0.135
141 11.75 0.57 0.184 ( 0.241) 0.050 0.135
142 11.83 0.60 0.195 ( 0.240) 0.052 0.143
143 11.92 0.60 0.195 ( 0.238) 0.052 0.143
144 12.00 0.60 0.195 ( 0.237) 0.052 0.143
145 12.08 0.83 0.271 ( 0.236) 0.073 0.198
146 12.17 0.83 0.271 ( 0.235) 0.073 0.198
147 12.25 0.83 0.271 ( 0.234) 0.073 0.198
148 12.33 0.87 0.282 ( 0.232) 0.076 0.206
149 12.42 0.87 0.282 ( 0.231) 0.076 0.206
150 12.50 0.87 0.282 ( 0.230) 0.076 0.206

Page 271 of 2775 ends

151 12.58 0.93 0.304 ( 0.229) 0.082 0.222
152 12.67 0.93 0.304 ( 0.228) 0.082 0.222
153 12.75 0.93 0.304 ( 0.227) 0.082 0.222
154 12.83 0.97 0.314 ( 0.226) 0.085 0.230
155 12.92 0.97 0.314 ( 0.224) 0.085 0.230
156 13.00 0.97 0.314 ( 0.223) 0.085 0.230
157 13.08 1.13 0.369 ( 0.222) 0.099 0.269
158 13.17 1.13 0.369 ( 0.221) 0.099 0.269
159 13.25 1.13 0.369 ( 0.220) 0.099 0.269
160 13.33 1.13 0.369 ( 0.219) 0.099 0.269
161 13.42 1.13 0.369 ( 0.218) 0.099 0.269
162 13.50 1.13 0.369 ( 0.217) 0.099 0.269
163 13.58 0.77 0.249 ( 0.215) 0.067 0.182
164 13.67 0.77 0.249 ( 0.214) 0.067 0.182
165 13.75 0.77 0.249 ( 0.213) 0.067 0.182
166 13.83 0.77 0.249 ( 0.212) 0.067 0.182
167 13.92 0.77 0.249 ( 0.211) 0.067 0.182
168 14.00 0.77 0.249 ( 0.210) 0.067 0.182
169 14.08 0.90 0.293 ( 0.209) 0.079 0.214
170 14.17 0.90 0.293 ( 0.208) 0.079 0.214
171 14.25 0.90 0.293 ( 0.207) 0.079 0.214
172 14.33 0.87 0.282 ( 0.206) 0.076 0.206
173 14.42 0.87 0.282 ( 0.205) 0.076 0.206
174 14.50 0.87 0.282 ( 0.204) 0.076 0.206
175 14.58 0.87 0.282 ( 0.203) 0.076 0.206
176 14.67 0.87 0.282 ( 0.202) 0.076 0.206
177 14.75 0.87 0.282 ( 0.201) 0.076 0.206
178 14.83 0.83 0.271 ( 0.199) 0.073 0.198
179 14.92 0.83 0.271 ( 0.198) 0.073 0.198
180 15.00 0.83 0.271 ( 0.197) 0.073 0.198
181 15.08 0.80 0.260 ( 0.196) 0.070 0.190
182 15.17 0.80 0.260 ( 0.195) 0.070 0.190
183 15.25 0.80 0.260 ( 0.194) 0.070 0.190
184 15.33 0.77 0.249 ( 0.193) 0.067 0.182
185 15.42 0.77 0.249 ( 0.192) 0.067 0.182
186 15.50 0.77 0.249 ( 0.191) 0.067 0.182
187 15.58 0.63 0.206 ( 0.190) 0.055 0.151
188 15.67 0.63 0.206 ( 0.189) 0.055 0.151
189 15.75 0.63 0.206 ( 0.189) 0.055 0.151
190 15.83 0.63 0.206 ( 0.188) 0.055 0.151
191 15.92 0.63 0.206 ( 0.187) 0.055 0.151
192 16.00 0.63 0.206 ( 0.186) 0.055 0.151
193 16.08 0.13 0.043 ( 0.185) 0.012 0.032
194 16.17 0.13 0.043 ( 0.184) 0.012 0.032
195 16.25 0.13 0.043 ( 0.183) 0.012 0.032
196 16.33 0.13 0.043 ( 0.182) 0.012 0.032
197 16.42 0.13 0.043 ( 0.181) 0.012 0.032
198 16.50 0.13 0.043 ( 0.180) 0.012 0.032
199 16.58 0.10 0.033 ( 0.179) 0.009 0.024
200 16.67 0.10 0.033 ( 0.178) 0.009 0.024
201 16.75 0.10 0.033 ( 0.177) 0.009 0.024
202 16.83 0.10 0.033 ( 0.176) 0.009 0.024
203 16.92 0.10 0.033 ( 0.176) 0.009 0.024
204 17.00 0.10 0.033 ( 0.175) 0.009 0.024
205 17.08 0.17 0.054 ( 0.174) 0.015 0.040
206 17.17 0.17 0.054 ( 0.173) 0.015 0.040
207 17.25 0.17 0.054 ( 0.172) 0.015 0.040
208 17.33 0.17 0.054 ( 0.171) 0.015 0.040
209 17.42 0.17 0.054 ( 0.170) 0.015 0.040
210 17.50 0.17 0.054 ( 0.169) 0.015 0.040
211 17.58 0.17 0.054 ( 0.169) 0.015 0.040
212 17.67 0.17 0.054 ( 0.168) 0.015 0.040
213 17.75 0.17 0.054 ( 0.167) 0.015 0.040

Page 272 of 2775 ends

214 17.83 0.13 0.043 ( 0.166) 0.012 0.032
215 17.92 0.13 0.043 ( 0.165) 0.012 0.032
216 18.00 0.13 0.043 ( 0.164) 0.012 0.032
217 18.08 0.13 0.043 ( 0.164) 0.012 0.032
218 18.17 0.13 0.043 ( 0.163) 0.012 0.032
219 18.25 0.13 0.043 ( 0.162) 0.012 0.032
220 18.33 0.13 0.043 ( 0.161) 0.012 0.032
221 18.42 0.13 0.043 ( 0.160) 0.012 0.032
222 18.50 0.13 0.043 ( 0.160) 0.012 0.032
223 18.58 0.10 0.033 ( 0.159) 0.009 0.024
224 18.67 0.10 0.033 ( 0.158) 0.009 0.024
225 18.75 0.10 0.033 ( 0.157) 0.009 0.024
226 18.83 0.07 0.022 ( 0.157) 0.006 0.016
227 18.92 0.07 0.022 ( 0.156) 0.006 0.016
228 19.00 0.07 0.022 ( 0.155) 0.006 0.016
229 19.08 0.10 0.033 ( 0.154) 0.009 0.024
230 19.17 0.10 0.033 ( 0.154) 0.009 0.024
231 19.25 0.10 0.033 ( 0.153) 0.009 0.024
232 19.33 0.13 0.043 ( 0.152) 0.012 0.032
233 19.42 0.13 0.043 ( 0.152) 0.012 0.032
234 19.50 0.13 0.043 ( 0.151) 0.012 0.032
235 19.58 0.10 0.033 ( 0.150) 0.009 0.024
236 19.67 0.10 0.033 ( 0.149) 0.009 0.024
237 19.75 0.10 0.033 ( 0.149) 0.009 0.024
238 19.83 0.07 0.022 ( 0.148) 0.006 0.016
239 19.92 0.07 0.022 ( 0.147) 0.006 0.016
240 20.00 0.07 0.022 ( 0.147) 0.006 0.016
241 20.08 0.10 0.033 ( 0.146) 0.009 0.024
242 20.17 0.10 0.033 ( 0.146) 0.009 0.024
243 20.25 0.10 0.033 ( 0.145) 0.009 0.024
244 20.33 0.10 0.033 ( 0.144) 0.009 0.024
245 20.42 0.10 0.033 ( 0.144) 0.009 0.024
246 20.50 0.10 0.033 ( 0.143) 0.009 0.024
247 20.58 0.10 0.033 ( 0.142) 0.009 0.024
248 20.67 0.10 0.033 ( 0.142) 0.009 0.024
249 20.75 0.10 0.033 ( 0.141) 0.009 0.024
250 20.83 0.07 0.022 ( 0.141) 0.006 0.016
251 20.92 0.07 0.022 ( 0.140) 0.006 0.016
252 21.00 0.07 0.022 ( 0.140) 0.006 0.016
253 21.08 0.10 0.033 ( 0.139) 0.009 0.024
254 21.17 0.10 0.033 ( 0.138) 0.009 0.024
255 21.25 0.10 0.033 ( 0.138) 0.009 0.024
256 21.33 0.07 0.022 ( 0.137) 0.006 0.016
257 21.42 0.07 0.022 ( 0.137) 0.006 0.016
258 21.50 0.07 0.022 ( 0.136) 0.006 0.016
259 21.58 0.10 0.033 ( 0.136) 0.009 0.024
260 21.67 0.10 0.033 ( 0.135) 0.009 0.024
261 21.75 0.10 0.033 ( 0.135) 0.009 0.024
262 21.83 0.07 0.022 ( 0.134) 0.006 0.016
263 21.92 0.07 0.022 ( 0.134) 0.006 0.016
264 22.00 0.07 0.022 ( 0.133) 0.006 0.016
265 22.08 0.10 0.033 ( 0.133) 0.009 0.024
266 22.17 0.10 0.033 ( 0.133) 0.009 0.024
267 22.25 0.10 0.033 ( 0.132) 0.009 0.024
268 22.33 0.07 0.022 ( 0.132) 0.006 0.016
269 22.42 0.07 0.022 ( 0.131) 0.006 0.016
270 22.50 0.07 0.022 ( 0.131) 0.006 0.016
271 22.58 0.07 0.022 ( 0.131) 0.006 0.016
272 22.67 0.07 0.022 ( 0.130) 0.006 0.016
273 22.75 0.07 0.022 ( 0.130) 0.006 0.016
274 22.83 0.07 0.022 ( 0.130) 0.006 0.016
275 22.92 0.07 0.022 ( 0.129) 0.006 0.016
276 23.00 0.07 0.022 ( 0.129) 0.006 0.016

Page 273 of 2775 ends

277 23.08
278 23.17
279 23.25
280 23.33
281 23.42
282 23.50
283 23.58
284 23.67
285 23.75
286 23.83
287 23.92
288 24.00

0.07 0.07

0.022

0.129)

0.128)

0.127)

0.126)

0.126)
(Loss Rate Not Used)
Sum = 100.0
Flood volume = Effective rainfall 1.98(In)
times area 1.3(Ac.)/[(In)/(Ft.)] =
Total soil loss = 0.73(In)
Total soil loss = 0.081(Ac.Ft)
Total rainfall = 2.71(In)
Flood volume = 9636.0 Cubic Feet
Total soil loss = 3545.9 Cubic Feet

0.006

0.016

0.016
Sum = 23.8

0.2(Ac.Ft)
Peak flow rate of this hydrograph = 0.364(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - H O U R STORM
Runoff Hydrograph
Hydrograph in 5 Minute intervals ((CFS))
Time(h+m) Volume Ac.Ft Q(CFS) 0

2.5 5.0

7.5 10.0
0+ 5 0.0001 0.02 Q I
0+10 0.0003 0.02 Q I
0+15 0.0004 0.02 Q I
0+20 0.0007 0.03 Q I
0+25 0.0009 0.03 Q I
0+30 0.0011 0.03 Q I
0+35 0.0013 0.03 Q I
0+40 0.0015 0.03 Q I
0+45 0.0018 0.03 Q I
0+50 0.0021 0.04 Q I
0+55 0.0024 0.04 Q I
1+ 0 0.0027 0.04 Q
1+ 5 0.0029 0.03 Q I
1+10 0.0031 0.03 Q I
1+15 0.0033 0.03 Q I
1+20 0.0035 0.03 Q I
1+25 0.0038 0.03 Q I
1+30 0.0040 0.03 Q I
1+35 0.0042 0.03 Q I
1+40 0.0044 0.03 Q I
1+45 0.0046 0.03 Q I
1+50 0.0049 0.04 Q
1+55 0.0052 0.04 Q I
2+ 0 0.0055 0.04 Q I
2+ 5 0.0058 0.04 QV I
2+10 0.0061 0.04 QV I
2+15 0.0064 0.04 QV I
2+20 0.0067 0.04 QV I
2+25 0.0070 0.04 QV I
2+30 0.0073 0.04 QV I

Page 274 of 2775 ends

2+35 0.0077 0.05 QV
2+40 0.0080 0.05 QV
2+45 0.0084 0.05 QV
2+50 0.0088 0.05 QV
2+55 0.0091 0.05 QV
3+ 0 0.0095 0.05 QV
3+ 5 0.0099 0.05 QV
3+10 0.0102 0.05 QV
3+15 0.0106 0.05 QV
3+20 0.0110 0.05 QV
3+25 0.0114 0.05 Q V
3+30 0.0117 0.05 Q V
3+35 0.0121 0.05 Q V
3+40 0.0125 0.05 Q V
3+45 0.0128 0.05 Q V
3+50 0.0133 0.06 Q V
3+55 0.0137 0.06 Q V
4+ 0 0.0142 0.06 Q V
4+ 5 0.0146 0.06 Q V
4+10 0.0150 0.06 Q V
4+15 0.0155 0.06 Q V
4+20 0.0160 0.07 Q V
4+25 0.0165 0.07 Q V
4+30 0.0170 0.07 Q V
4+35 0.0175 0.07 Q V
4+40 0.0181 0.07 Q V
4+45 0.0186 0.07 Q V
4+50 0.0192 0.09 Q V
4+55 0.0198 0.09 Q V
5+ 0 0.0204 0.09 Q V
5+ 5 0.0208 0.06 Q V
5+10 0.0212 0.06 Q V
5+15 0.0217 0.06 Q V
5+20 0.0222 0.07 Q v
5+25 0.0227 0.07 Q V
5+30 0.0232 0.07 Q V
5+35 0.0238 0.09 Q V
5+40 0.0244 0.09 Q V
5+45 0.0250 0.09 Q v
5+50 0.0256 0.09 Q V
5+55 0.0262 0.09 Q V
6+ 0 0.0268 0.09 Q V
6+ 5 0.0274 0.10 Q V
6+10 0.0281 0.10 Q V
6+15 0.0288 0.10 Q V
6+20 0.0294 0.10 Q V
6+25 0.0301 0.10 Q V
6+30 0.0307 0.10 Q V
6+35 0.0315 0.11 Q V
6+40 0.0322 0.11 Q V
6+45 0.0330 0.11 Q V
6+50 0.0337 0.11 Q V
6+55 0.0344 0.11 Q V
7+ 0 0.0352 0.11 Q V
7+ 5 0.0359 0.11 Q V
7+10 0.0366 0.11 Q V
7+15 0.0374 0.11 Q V
7+20 0.0382 0.12 Q V
7+25 0.0390 0.12 Q V
7+30 0.0398 0.12 Q V
7+35 0.0407 0.13 Q V
7+40 0.0416 0.13 Q V
7+45 0.0425 0.13 Q V

Page 275 of 2775 ends

7+50 0.0434 0.14 Q V I
7+55 0.0444 0.14 Q V
8+ 0 0.0453 0.14 Q V
8+ 5 0.0465 0.16 Q V I
8+10 0.0476 0.16 Q V I
8+15 0.0487 0.16 Q V I
8+20 0.0498 0.16 Q V I
8+25 0.0509 0.16 Q VI
8+30 0.0520 0.16 Q VI
8+35 0.0532 0.17 Q VI
8+40 0.0543 0.17 Q VI
8+45 0.0555 0.17 Q V
8+50 0.0568 0.18 Q V
8+55 0.0580 0.18 Q V
9+ 0 0.0593 0.18 Q V
9+ 5 0.0607 0.20 Q V
9+10 0.0621 0.20 Q V
9+15 0.0635 0.20 Q V
9+20 0.0650 0.21 Q V
9+25 0.0664 0.21 Q V
9+30 0.0679 0.21 Q V
9+35 0.0695 0.22 Q V
9+40 0.0710 0.22 Q V
9+45 0.0726 0.22 Q V
9+50 0.0742 0.24 Q V
9+55 0.0758 0.24 Q V
10+ 0 0.0774 0.24 Q V
10+ 5 0.0785 0.16 Q V
10+10 0.0796 0.16 Q V
10+15 0.0807 0.16 Q V
10+20 0.0818 0.16 Q V
10+25 0.0830 0.16 Q V
10+30 0.0841 0.16 Q V
10+35 0.0855 0.21 Q V
10+40 0.0870 0.21 Q V
10+45 0.0885 0.21 Q V
10+50 0.0900 0.21 Q V
10+55 0.0914 0.21 Q V
11+ 0 0.0929 0.21 Q V
11+ 5 0.0943 0.20 Q V
11+10 0.0957 0.20 Q V
11+15 0.0971 0.20 Q V
11+20 0.0985 0.20 Q V
11+25 0.0999 0.20 Q V
11+30 0.1013 0.20 Q V
11+35 0.1026 0.18 Q V
11+40 0.1038 0.18 Q V
11+45 0.1051 0.18 Q V
11+50 0.1064 0.19 Q V
11+55 0.1077 0.19 Q V
12+ 0 0.1091 0.19 Q V
12+ 5 0.1109 0.27 Q V
12+10 0.1127 0.27 Q V
12+15 0.1146 0.27 Q V
12+20 0.1165 0.28 Q V
12+25 0.1184 0.28 Q V
12+30 0.1203 0.28 Q V
12+35 0.1224 0.30 Q V
12+40 0.1245 0.30 Q V
12+45 0.1265 0.30 Q V
12+50 0.1287 0.31 Q V
12+55 0.1308 0.31 Q V
13+ 0 0.1329 0.31 Q V

Page 276 of 2775 ends

13+ 5 0.1355 0.36 IQ
13+10 0.1380 0.36 IQ
13+15 0.1405 0.36 IQ
13+20 0.1430 0.36 IQ
13+25 0.1455 0.36 IQ
13+30 0.1480 0.36 IQ
13+35 0.1497 0.25 Q
13+40 0.1514 0.25 Q
13+45 0.1531 0.25 Q
13+50 0.1548 0.25 Q
13+55 0.1565 0.25 Q
14+ 0 0.1582 0.25 Q
14+ 5 0.1602 0.29 Q
14+10 0.1621 0.29 Q
14+15 0.1641 0.29 Q
14+20 0.1661 0.28 Q
14+25 0.1680 0.28 Q
14+30 0.1699 0.28 Q
14+35 0.1718 0.28 Q
14+40 0.1737 0.28 Q
14+45 0.1756 0.28 Q
14+50 0.1775 0.27 Q
14+55 0.1793 0.27 Q
15+ 0 0.1812 0.27 Q
15+ 5 0.1829 0.26 Q
15+10 0.1847 0.26 Q
15+15 0.1865 0.26 Q
15+20 0.1882 0.25 Q
15+25 0.1899 0.25 Q
15+30 0.1916 0.25 Q
15+35 0.1930 0.20 Q
15+40 0.1944 0.20 Q
15+45 0.1958 0.20 Q
15+50 0.1972 0.20 Q
15+55 0.1986 0.20 Q
16+ 0 0.2000 0.20 Q
16+ 5 0.2003 0.04 Q
16+10 0.2006 0.04 Q
16+15 0.2009 0.04 Q
16+20 0.2012 0.04 Q
16+25 0.2015 0.04 Q
16+30 0.2017 0.04 Q
16+35 0.2020 0.03 Q
16+40 0.2022 0.03 Q
16+45 0.2024 0.03 Q
16+50 0.2026 0.03 Q
16+55 0.2029 0.03 Q
17+ 0 0.2031 0.03 Q
17+ 5 0.2034 0.05 Q
17+10 0.2038 0.05 Q
17+15 0.2042 0.05 Q
17+20 0.2045 0.05 Q
17+25 0.2049 0.05 Q
17+30 0.2053 0.05 Q
17+35 0.2057 0.05 Q
17+40 0.2060 0.05 Q
17+45 0.2064 0.05 Q
17+50 0.2067 0.04 Q
17+55 0.2070 0.04 Q
18+ 0 0.2073 0.04 Q
18+ 5 0.2076 0.04 Q
18+10 0.2079 0.04 Q
18+15 0.2082 0.04 Q
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
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V
V

Page 277 of 2775 ends

18+20 0.2085 0.04 Q
18+25 0.2088 0.04 Q
18+30 0.2090 0.04 Q
18+35 0.2093 0.03 Q
18+40 0.2095 0.03 Q
18+45 0.2097 0.03 Q
18+50 0.2099 0.02 Q
18+55 0.2100 0.02 Q
19+ 0 0.2102 0.02 Q
19+ 5 0.2104 0.03 Q
19+10 0.2106 0.03 Q
19+15 0.2108 0.03 Q
19+20 0.2111 0.04 Q
19+25 0.2114 0.04 Q
19+30 0.2117 0.04 Q
19+35 0.2119 0.03 Q
19+40 0.2121 0.03 Q
19+45 0.2124 0.03 Q
19+50 0.2125 0.02 Q
19+55 0.2127 0.02 Q
20+ 0 0.2128 0.02 Q
20+ 5 0.2130 0.03 Q
20+10 0.2132 0.03 Q
20+15 0.2135 0.03 Q
20+20 0.2137 0.03 Q
20+25 0.2139 0.03 Q
20+30 0.2141 0.03 Q
20+35 0.2144 0.03 Q
20+40 0.2146 0.03 Q
20+45 0.2148 0.03 Q
20+50 0.2149 0.02 Q
20+55 0.2151 0.02 Q
21+ 0 0.2152 0.02 Q
21+ 5 0.2155 0.03 Q
21+10 0.2157 0.03 Q
21+15 0.2159 0.03 Q
21+20 0.2161 0.02 Q
21+25 0.2162 0.02 Q
21+30 0.2163 0.02 Q
21+35 0.2166 0.03 Q
21+40 0.2168 0.03 Q
21+45 0.2170 0.03 Q
21+50 0.2172 0.02 Q
21+55 0.2173 0.02 Q
22+ 0 0.2175 0.02 Q
22+ 5 0.2177 0.03 Q
22+10 0.2179 0.03 Q
22+15 0.2181 0.03 Q
22+20 0.2183 0.02 Q
22+25 0.2184 0.02 Q
22+30 0.2186 0.02 Q
22+35 0.2187 0.02 Q
22+40 0.2189 0.02 Q
22+45 0.2190 0.02 Q
22+50 0.2191 0.02 Q
22+55 0.2193 0.02 Q
23+ 0 0.2194 0.02 Q
23+ 5 0.2196 0.02 Q
23+10 0.2197 0.02 Q
23+15 0.2199 0.02 Q
23+20 0.2200 0.02 Q
23+25 0.2202 0.02 Q
23+30 0.2203 0.02 Q
V
V
V
V
V
V
V
V
V
V
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Page 278 of 2775 ends

23+35 0.2205 0.02 Q
23+40 0.2206 0.02 Q
23+45 0.2208 0.02 Q
23+50 0.2209 0.02 Q
23+55 0.2211 0.02 Q
24+ 0 0.2212 0.02 Q
VI
VI
VI
VI
VI
VI

Page 279 of 2775 ends

Unit H y d r o g r a p h Analysis
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 11/26/24 File: beaulibpost242.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6447
English (in -lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format

BEAUMONT LIBRARY REDEVELOPMENT PROJECT
2 -YEAR, 24 -HOUR STORM EVENT, HYDROGRAPH

POST CONDITION
Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth -Area Areal Adjustment =
Sq. Mi.

Length along longest watercourse = 330.00(Ft.)
Length along longest watercourse measured to centroid
Length along longest watercourse = 0.063 Mi.

Length along longest watercourse measured to centroid
Difference in elevation = 9.10(Ft.)
Slope along watercourse = 145.6000 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.013 Hr.

Lag time = 0.79 Min.
25% of lag time = 0.20 Min.
40% of lag time = 0.32 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area (Ac.)[1]

1.34 Rainfall(In)[2] Weighting[1*2]

2.71 3.63
100 YEAR Area rainfall data:

Area (Ac .) [1]

1.34 Rainfall(In)[2] Weighting[1*2]

6.50 8.71
STORM EVENT (YEAR) = 2.00
Area Averaged 2 -Year Rainfall = 2.710(In)
Area Averaged 100 -Year Rainfall = 6.500(In)

1.34(Ac.)
169.00(Ft.)

0.032 Mi.

Page 280 of 2775 ends

Point rain (area averaged) = 2.710(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 2.710(In)
Sub -Area Data:

Area(Ac.) Runoff Index Impervious %

1.340 32.00 0.910
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F
AMC2 AMC -1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

32.0 16.2 0.870 0.910 0.158 1.000 0.158
Sum (F) = 0.158
Area averaged mean soil loss (F) (In/Hr) = 0.158
Minimum soil loss rate ((In/Hr)) = 9.079
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.164
Unit Hydrograph
DESERT S -Curve
Unit Hydrograph Data
Unit time period Time % of lag Distribution Unit Hydrograph (hrs)
Graph % (CFS)
1 0.083
2 0.167
632.538
1265.076

76.700

23.300
Sum = 100.000 Sum=

1.036

0.315

1.350
The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain
(Hr.) Percent (In/Hr)
1 0.08 0.07 0.022
2 0.17 0.07 0.022
3 0.25 0.07 0.022
4 0.33 0.10 0.033
5 0.42 0.10 0.033
6 0.50 0.10 0.033
7 0.58 0.10 0.033
8 0.67 0.10 0.033
9 0.75 0.10 0.033
10 0.83 0.13 0.043
11 0.92 0.13 0.043
12 1.00 0.13 0.043
13 1.08 0.10 0.033
14 1.17 0.10 0.033
15 1.25 0.10 0.033
16 1.33 0.10 0.033
17 1.42 0.10 0.033
18 1.50 0.10 0.033
19 1.58 0.10 0.033
20 1.67 0.10 0.033
21 1.75 0.10 0.033
22 1.83 0.13 0.043
23 1.92 0.13 0.043
Loss rate(In./Hr) Effective
Max I Low (In/Hr)

0.279) 0.004 0.018

0.278) 0.004 0.018

0.277) 0.004 0.018

0.276) 0.005 0.027

0.275) 0.005 0.027

0.274) 0.005 0.027

0.273) 0.005 0.027

0.272) 0.005 0.027

0.271) 0.005 0.027

0.270) 0.007 0.036

0.269) 0.007 0.036

0.268) 0.007 0.036

0.266) 0.005 0.027

0.265) 0.005 0.027

0.264) 0.005 0.027

0.263) 0.005 0.027

0.262) 0.005 0.027

0.261) 0.005 0.027

0.260) 0.005 0.027

0.259) 0.005 0.027

0.258) 0.005 0.027

0.257) 0.007 0.036

0.256) 0.007 0.036

Page 281 of 2775 ends

24 2.00 0.13 0.043 ( 0.255) 0.007 0.036
25 2.08 0.13 0.043 ( 0.254) 0.007 0.036
26 2.17 0.13 0.043 ( 0.253) 0.007 0.036
27 2.25 0.13 0.043 ( 0.252) 0.007 0.036
28 2.33 0.13 0.043 ( 0.251) 0.007 0.036
29 2.42 0.13 0.043 ( 0.250) 0.007 0.036
30 2.50 0.13 0.043 ( 0.249) 0.007 0.036
31 2.58 0.17 0.054 ( 0.248) 0.009 0.045
32 2.67 0.17 0.054 ( 0.247) 0.009 0.045
33 2.75 0.17 0.054 ( 0.246) 0.009 0.045
34 2.83 0.17 0.054 ( 0.245) 0.009 0.045
35 2.92 0.17 0.054 ( 0.244) 0.009 0.045
36 3.00 0.17 0.054 ( 0.243) 0.009 0.045
37 3.08 0.17 0.054 ( 0.242) 0.009 0.045
38 3.17 0.17 0.054 ( 0.241) 0.009 0.045
39 3.25 0.17 0.054 ( 0.240) 0.009 0.045
40 3.33 0.17 0.054 ( 0.239) 0.009 0.045
41 3.42 0.17 0.054 ( 0.238) 0.009 0.045
42 3.50 0.17 0.054 ( 0.237) 0.009 0.045
43 3.58 0.17 0.054 ( 0.236) 0.009 0.045
44 3.67 0.17 0.054 ( 0.235) 0.009 0.045
45 3.75 0.17 0.054 ( 0.234) 0.009 0.045
46 3.83 0.20 0.065 ( 0.233) 0.011 0.054
47 3.92 0.20 0.065 ( 0.232) 0.011 0.054
48 4.00 0.20 0.065 ( 0.231) 0.011 0.054
49 4.08 0.20 0.065 ( 0.230) 0.011 0.054
50 4.17 0.20 0.065 ( 0.229) 0.011 0.054
51 4.25 0.20 0.065 ( 0.228) 0.011 0.054
52 4.33 0.23 0.076 ( 0.227) 0.012 0.063
53 4.42 0.23 0.076 ( 0.226) 0.012 0.063
54 4.50 0.23 0.076 ( 0.225) 0.012 0.063
55 4.58 0.23 0.076 ( 0.224) 0.012 0.063
56 4.67 0.23 0.076 ( 0.223) 0.012 0.063
57 4.75 0.23 0.076 ( 0.222) 0.012 0.063
58 4.83 0.27 0.087 ( 0.221) 0.014 0.072
59 4.92 0.27 0.087 ( 0.220) 0.014 0.072
60 5.00 0.27 0.087 ( 0.219) 0.014 0.072
61 5.08 0.20 0.065 ( 0.218) 0.011 0.054
62 5.17 0.20 0.065 ( 0.217) 0.011 0.054
63 5.25 0.20 0.065 ( 0.216) 0.011 0.054
64 5.33 0.23 0.076 ( 0.215) 0.012 0.063
65 5.42 0.23 0.076 ( 0.214) 0.012 0.063
66 5.50 0.23 0.076 ( 0.214) 0.012 0.063
67 5.58 0.27 0.087 ( 0.213) 0.014 0.072
68 5.67 0.27 0.087 ( 0.212) 0.014 0.072
69 5.75 0.27 0.087 ( 0.211) 0.014 0.072
70 5.83 0.27 0.087 ( 0.210) 0.014 0.072
71 5.92 0.27 0.087 ( 0.209) 0.014 0.072
72 6.00 0.27 0.087 ( 0.208) 0.014 0.072
73 6.08 0.30 0.098 ( 0.207) 0.016 0.082
74 6.17 0.30 0.098 ( 0.206) 0.016 0.082
75 6.25 0.30 0.098 ( 0.205) 0.016 0.082
76 6.33 0.30 0.098 ( 0.204) 0.016 0.082
77 6.42 0.30 0.098 ( 0.203) 0.016 0.082
78 6.50 0.30 0.098 ( 0.202) 0.016 0.082
79 6.58 0.33 0.108 ( 0.202) 0.018 0.091
80 6.67 0.33 0.108 ( 0.201) 0.018 0.091
81 6.75 0.33 0.108 ( 0.200) 0.018 0.091
82 6.83 0.33 0.108 ( 0.199) 0.018 0.091
83 6.92 0.33 0.108 ( 0.198) 0.018 0.091
84 7.00 0.33 0.108 ( 0.197) 0.018 0.091
85 7.08 0.33 0.108 ( 0.196) 0.018 0.091
86 7.17 0.33 0.108 ( 0.195) 0.018 0.091

Page 282 of 2775 ends

87 7.25 0.33 0.108 ( 0.194) 0.018 0.091
88 7.33 0.37 0.119 ( 0.193) 0.020 0.100
89 7.42 0.37 0.119 ( 0.193) 0.020 0.100
90 7.50 0.37 0.119 ( 0.192) 0.020 0.100
91 7.58 0.40 0.130 ( 0.191) 0.021 0.109
92 7.67 0.40 0.130 ( 0.190) 0.021 0.109
93 7.75 0.40 0.130 ( 0.189) 0.021 0.109
94 7.83 0.43 0.141 ( 0.188) 0.023 0.118
95 7.92 0.43 0.141 ( 0.187) 0.023 0.118
96 8.00 0.43 0.141 ( 0.186) 0.023 0.118
97 8.08 0.50 0.163 ( 0.186) 0.027 0.136
98 8.17 0.50 0.163 ( 0.185) 0.027 0.136
99 8.25 0.50 0.163 ( 0.184) 0.027 0.136
100 8.33 0.50 0.163 ( 0.183) 0.027 0.136
101 8.42 0.50 0.163 ( 0.182) 0.027 0.136
102 8.50 0.50 0.163 ( 0.181) 0.027 0.136
103 8.58 0.53 0.173 ( 0.180) 0.028 0.145
104 8.67 0.53 0.173 ( 0.180) 0.028 0.145
105 8.75 0.53 0.173 ( 0.179) 0.028 0.145
106 8.83 0.57 0.184 ( 0.178) 0.030 0.154
107 8.92 0.57 0.184 ( 0.177) 0.030 0.154
108 9.00 0.57 0.184 ( 0.176) 0.030 0.154
109 9.08 0.63 0.206 ( 0.175) 0.034 0.172
110 9.17 0.63 0.206 ( 0.175) 0.034 0.172
111 9.25 0.63 0.206 ( 0.174) 0.034 0.172
112 9.33 0.67 0.217 ( 0.173) 0.036 0.181
113 9.42 0.67 0.217 ( 0.172) 0.036 0.181
114 9.50 0.67 0.217 ( 0.171) 0.036 0.181
115 9.58 0.70 0.228 ( 0.170) 0.037 0.190
116 9.67 0.70 0.228 ( 0.170) 0.037 0.190
117 9.75 0.70 0.228 ( 0.169) 0.037 0.190
118 9.83 0.73 0.238 ( 0.168) 0.039 0.199
119 9.92 0.73 0.238 ( 0.167) 0.039 0.199
120 10.00 0.73 0.238 ( 0.166) 0.039 0.199
121 10.08 0.50 0.163 ( 0.166) 0.027 0.136
122 10.17 0.50 0.163 ( 0.165) 0.027 0.136
123 10.25 0.50 0.163 ( 0.164) 0.027 0.136
124 10.33 0.50 0.163 ( 0.163) 0.027 0.136
125 10.42 0.50 0.163 ( 0.162) 0.027 0.136
126 10.50 0.50 0.163 ( 0.162) 0.027 0.136
127 10.58 0.67 0.217 ( 0.161) 0.036 0.181
128 10.67 0.67 0.217 ( 0.160) 0.036 0.181
129 10.75 0.67 0.217 ( 0.159) 0.036 0.181
130 10.83 0.67 0.217 ( 0.158) 0.036 0.181
131 10.92 0.67 0.217 ( 0.158) 0.036 0.181
132 11.00 0.67 0.217 ( 0.157) 0.036 0.181
133 11.08 0.63 0.206 ( 0.156) 0.034 0.172
134 11.17 0.63 0.206 ( 0.155) 0.034 0.172
135 11.25 0.63 0.206 ( 0.155) 0.034 0.172
136 11.33 0.63 0.206 ( 0.154) 0.034 0.172
137 11.42 0.63 0.206 ( 0.153) 0.034 0.172
138 11.50 0.63 0.206 ( 0.152) 0.034 0.172
139 11.58 0.57 0.184 ( 0.152) 0.030 0.154
140 11.67 0.57 0.184 ( 0.151) 0.030 0.154
141 11.75 0.57 0.184 ( 0.150) 0.030 0.154
142 11.83 0.60 0.195 ( 0.149) 0.032 0.163
143 11.92 0.60 0.195 ( 0.149) 0.032 0.163
144 12.00 0.60 0.195 ( 0.148) 0.032 0.163
145 12.08 0.83 0.271 ( 0.147) 0.044 0.227
146 12.17 0.83 0.271 ( 0.146) 0.044 0.227
147 12.25 0.83 0.271 ( 0.146) 0.044 0.227
148 12.33 0.87 0.282 ( 0.145) 0.046 0.236
149 12.42 0.87 0.282 ( 0.144) 0.046 0.236

Page 283 of 2775 ends

150 12.50 0.87 0.282 ( 0.143) 0.046 0.236
151 12.58 0.93 0.304 ( 0.143) 0.050 0.254
152 12.67 0.93 0.304 ( 0.142) 0.050 0.254
153 12.75 0.93 0.304 ( 0.141) 0.050 0.254
154 12.83 0.97 0.314 ( 0.141) 0.052 0.263
155 12.92 0.97 0.314 ( 0.140) 0.052 0.263
156 13.00 0.97 0.314 ( 0.139) 0.052 0.263
157 13.08 1.13 0.369 ( 0.138) 0.060 0.308
158 13.17 1.13 0.369 ( 0.138) 0.060 0.308
159 13.25 1.13 0.369 ( 0.137) 0.060 0.308
160 13.33 1.13 0.369 ( 0.136) 0.060 0.308
161 13.42 1.13 0.369 ( 0.136) 0.060 0.308
162 13.50 1.13 0.369 ( 0.135) 0.060 0.308
163 13.58 0.77 0.249 ( 0.134) 0.041 0.208
164 13.67 0.77 0.249 ( 0.134) 0.041 0.208
165 13.75 0.77 0.249 ( 0.133) 0.041 0.208
166 13.83 0.77 0.249 ( 0.132) 0.041 0.208
167 13.92 0.77 0.249 ( 0.132) 0.041 0.208
168 14.00 0.77 0.249 ( 0.131) 0.041 0.208
169 14.08 0.90 0.293 ( 0.130) 0.048 0.245
170 14.17 0.90 0.293 ( 0.130) 0.048 0.245
171 14.25 0.90 0.293 ( 0.129) 0.048 0.245
172 14.33 0.87 0.282 ( 0.128) 0.046 0.236
173 14.42 0.87 0.282 ( 0.128) 0.046 0.236
174 14.50 0.87 0.282 ( 0.127) 0.046 0.236
175 14.58 0.87 0.282 ( 0.126) 0.046 0.236
176 14.67 0.87 0.282 ( 0.126) 0.046 0.236
177 14.75 0.87 0.282 ( 0.125) 0.046 0.236
178 14.83 0.83 0.271 ( 0.124) 0.044 0.227
179 14.92 0.83 0.271 ( 0.124) 0.044 0.227
180 15.00 0.83 0.271 ( 0.123) 0.044 0.227
181 15.08 0.80 0.260 ( 0.122) 0.043 0.217
182 15.17 0.80 0.260 ( 0.122) 0.043 0.217
183 15.25 0.80 0.260 ( 0.121) 0.043 0.217
184 15.33 0.77 0.249 ( 0.121) 0.041 0.208
185 15.42 0.77 0.249 ( 0.120) 0.041 0.208
186 15.50 0.77 0.249 ( 0.119) 0.041 0.208
187 15.58 0.63 0.206 ( 0.119) 0.034 0.172
188 15.67 0.63 0.206 ( 0.118) 0.034 0.172
189 15.75 0.63 0.206 ( 0.117) 0.034 0.172
190 15.83 0.63 0.206 ( 0.117) 0.034 0.172
191 15.92 0.63 0.206 ( 0.116) 0.034 0.172
192 16.00 0.63 0.206 ( 0.116) 0.034 0.172
193 16.08 0.13 0.043 ( 0.115) 0.007 0.036
194 16.17 0.13 0.043 ( 0.115) 0.007 0.036
195 16.25 0.13 0.043 ( 0.114) 0.007 0.036
196 16.33 0.13 0.043 ( 0.113) 0.007 0.036
197 16.42 0.13 0.043 ( 0.113) 0.007 0.036
198 16.50 0.13 0.043 ( 0.112) 0.007 0.036
199 16.58 0.10 0.033 ( 0.112) 0.005 0.027
200 16.67 0.10 0.033 ( 0.111) 0.005 0.027
201 16.75 0.10 0.033 ( 0.110) 0.005 0.027
202 16.83 0.10 0.033 ( 0.110) 0.005 0.027
203 16.92 0.10 0.033 ( 0.109) 0.005 0.027
204 17.00 0.10 0.033 ( 0.109) 0.005 0.027
205 17.08 0.17 0.054 ( 0.108) 0.009 0.045
206 17.17 0.17 0.054 ( 0.108) 0.009 0.045
207 17.25 0.17 0.054 ( 0.107) 0.009 0.045
208 17.33 0.17 0.054 ( 0.107) 0.009 0.045
209 17.42 0.17 0.054 ( 0.106) 0.009 0.045
210 17.50 0.17 0.054 ( 0.106) 0.009 0.045
211 17.58 0.17 0.054 ( 0.105) 0.009 0.045
212 17.67 0.17 0.054 ( 0.105) 0.009 0.045

Page 284 of 2775 ends

213 17.75 0.17 0.054 ( 0.104) 0.009 0.045
214 17.83 0.13 0.043 ( 0.103) 0.007 0.036
215 17.92 0.13 0.043 ( 0.103) 0.007 0.036
216 18.00 0.13 0.043 ( 0.102) 0.007 0.036
217 18.08 0.13 0.043 ( 0.102) 0.007 0.036
218 18.17 0.13 0.043 ( 0.101) 0.007 0.036
219 18.25 0.13 0.043 ( 0.101) 0.007 0.036
220 18.33 0.13 0.043 ( 0.100) 0.007 0.036
221 18.42 0.13 0.043 ( 0.100) 0.007 0.036
222 18.50 0.13 0.043 ( 0.100) 0.007 0.036
223 18.58 0.10 0.033 ( 0.099) 0.005 0.027
224 18.67 0.10 0.033 ( 0.099) 0.005 0.027
225 18.75 0.10 0.033 ( 0.098) 0.005 0.027
226 18.83 0.07 0.022 ( 0.098) 0.004 0.018
227 18.92 0.07 0.022 ( 0.097) 0.004 0.018
228 19.00 0.07 0.022 ( 0.097) 0.004 0.018
229 19.08 0.10 0.033 ( 0.096) 0.005 0.027
230 19.17 0.10 0.033 ( 0.096) 0.005 0.027
231 19.25 0.10 0.033 ( 0.095) 0.005 0.027
232 19.33 0.13 0.043 ( 0.095) 0.007 0.036
233 19.42 0.13 0.043 ( 0.094) 0.007 0.036
234 19.50 0.13 0.043 ( 0.094) 0.007 0.036
235 19.58 0.10 0.033 ( 0.094) 0.005 0.027
236 19.67 0.10 0.033 ( 0.093) 0.005 0.027
237 19.75 0.10 0.033 ( 0.093) 0.005 0.027
238 19.83 0.07 0.022 ( 0.092) 0.004 0.018
239 19.92 0.07 0.022 ( 0.092) 0.004 0.018
240 20.00 0.07 0.022 ( 0.091) 0.004 0.018
241 20.08 0.10 0.033 ( 0.091) 0.005 0.027
242 20.17 0.10 0.033 ( 0.091) 0.005 0.027
243 20.25 0.10 0.033 ( 0.090) 0.005 0.027
244 20.33 0.10 0.033 ( 0.090) 0.005 0.027
245 20.42 0.10 0.033 ( 0.090) 0.005 0.027
246 20.50 0.10 0.033 ( 0.089) 0.005 0.027
247 20.58 0.10 0.033 ( 0.089) 0.005 0.027
248 20.67 0.10 0.033 ( 0.088) 0.005 0.027
249 20.75 0.10 0.033 ( 0.088) 0.005 0.027
250 20.83 0.07 0.022 ( 0.088) 0.004 0.018
251 20.92 0.07 0.022 ( 0.087) 0.004 0.018
252 21.00 0.07 0.022 ( 0.087) 0.004 0.018
253 21.08 0.10 0.033 ( 0.087) 0.005 0.027
254 21.17 0.10 0.033 ( 0.086) 0.005 0.027
255 21.25 0.10 0.033 ( 0.086) 0.005 0.027
256 21.33 0.07 0.022 ( 0.086) 0.004 0.018
257 21.42 0.07 0.022 ( 0.085) 0.004 0.018
258 21.50 0.07 0.022 ( 0.085) 0.004 0.018
259 21.58 0.10 0.033 ( 0.085) 0.005 0.027
260 21.67 0.10 0.033 ( 0.084) 0.005 0.027
261 21.75 0.10 0.033 ( 0.084) 0.005 0.027
262 21.83 0.07 0.022 ( 0.084) 0.004 0.018
263 21.92 0.07 0.022 ( 0.083) 0.004 0.018
264 22.00 0.07 0.022 ( 0.083) 0.004 0.018
265 22.08 0.10 0.033 ( 0.083) 0.005 0.027
266 22.17 0.10 0.033 ( 0.083) 0.005 0.027
267 22.25 0.10 0.033 ( 0.082) 0.005 0.027
268 22.33 0.07 0.022 ( 0.082) 0.004 0.018
269 22.42 0.07 0.022 ( 0.082) 0.004 0.018
270 22.50 0.07 0.022 ( 0.082) 0.004 0.018
271 22.58 0.07 0.022 ( 0.081) 0.004 0.018
272 22.67 0.07 0.022 ( 0.081) 0.004 0.018
273 22.75 0.07 0.022 ( 0.081) 0.004 0.018
274 22.83 0.07 0.022 ( 0.081) 0.004 0.018
275 22.92 0.07 0.022 ( 0.081) 0.004 0.018

Page 285 of 2775 ends

276 23.00 0.07 0.022 ( 0.080)
277 23.08 0.07 0.022 ( 0.080)
278 23.17 0.07 0.022 ( 0.080)
279 23.25 0.07 0.022 ( 0.080)
280 23.33 0.07 0.022 ( 0.080)
281 23.42 0.07 0.022 ( 0.079)
282 23.50 0.07 0.022 ( 0.079)
283 23.58 0.07 0.022 ( 0.079)
284 23.67 0.07 0.022 ( 0.079)
285 23.75 0.07 0.022 ( 0.079)
286 23.83 0.07 0.022 ( 0.079)
287 23.92 0.07 0.022 ( 0.079)
288 24.00 0.07 0.022 ( 0.079)
(Loss Rate Not Used)
Sum = 100.0
Flood volume = Effective rainfall 2.27(In)
times area 1.3(Ac.)/[(In)/(Ft.)] =
Total soil loss = 0.44(In)
Total soil loss = 0.050(Ac.Ft)
Total rainfall = 2.71(In)
Flood volume = 11020.1 Cubic Feet
Total soil loss = 2161.8 Cubic Feet

0.004

0.018

0.018
Sum = 27.2

0.3 (Ac.Ft)
Peak flow rate of this hydrograph = 0.416(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - H O U R STORM
Runoff Hydrograph
Hydrograph in 5 Minute intervals ((CFS))
Time(h+m) Volume Ac.Ft Q(CFS) 0

2.5 5.0

7.5 10.0
0+ 5 0.0001 0.02 Q
0+10 0.0003 0.02 Q
0+15 0.0005 0.02 Q
0+20 0.0007 0.03 Q
0+25 0.0010 0.04 Q
0+30 0.0012 0.04 Q
0+35 0.0015 0.04 Q
0+40 0.0017 0.04 Q
0+45 0.0020 0.04 Q
0+50 0.0023 0.05 Q
0+55 0.0026 0.05 Q
1+ 0 0.0030 0.05 Q
1+ 5 0.0032 0.04 Q
1+10 0.0035 0.04 Q
1+15 0.0037 0.04 Q
1+20 0.0040 0.04 Q
1+25 0.0042 0.04 Q
1+30 0.0045 0.04 Q
1+35 0.0047 0.04 Q
1+40 0.0050 0.04 Q
1+45 0.0053 0.04 Q
1+50 0.0056 0.05 Q
1+55 0.0059 0.05 Q
2+ 0 0.0062 0.05 Q
2+ 5 0.0066 0.05 QV
2+10 0.0069 0.05 QV
2+15 0.0073 0.05 QV
2+20 0.0076 0.05 QV
2+25 0.0079 0.05 QV

Page 286 of 2775 ends

2+30 0.0083 0.05 QV
2+35 0.0087 0.06 QV
2+40 0.0091 0.06 QV
2+45 0.0095 0.06 QV
2+50 0.0099 0.06 QV
2+55 0.0104 0.06 QV
3+ 0 0.0108 0.06 QV
3+ 5 0.0112 0.06 QV
3+10 0.0116 0.06 QV
3+15 0.0120 0.06 QV
3+20 0.0125 0.06 QV
3+25 0.0129 0.06 Q V
3+30 0.0133 0.06 Q V
3+35 0.0137 0.06 Q V
3+40 0.0142 0.06 Q V
3+45 0.0146 0.06 Q V
3+50 0.0151 0.07 Q V
3+55 0.0156 0.07 Q V
4+ 0 0.0161 0.07 Q V
4+ 5 0.0166 0.07 Q V
4+10 0.0171 0.07 Q V
4+15 0.0176 0.07 Q V
4+20 0.0182 0.08 Q V
4+25 0.0188 0.09 Q V
4+30 0.0193 0.09 Q V
4+35 0.0199 0.09 Q V
4+40 0.0205 0.09 Q V
4+45 0.0211 0.09 Q V
4+50 0.0218 0.10 Q V
4+55 0.0224 0.10 Q V
5+ 0 0.0231 0.10 Q V
5+ 5 0.0237 0.08 Q V
5+10 0.0242 0.07 Q V
5+15 0.0247 0.07 Q V
5+20 0.0252 0.08 Q V
5+25 0.0258 0.09 Q V
5+30 0.0264 0.09 Q V
5+35 0.0271 0.10 Q V
5+40 0.0278 0.10 Q v
5+45 0.0284 0.10 Q V
5+50 0.0291 0.10 Q V
5+55 0.0298 0.10 Q V
6+ 0 0.0305 0.10 Q v
6+ 5 0.0312 0.11 Q V
6+10 0.0320 0.11 Q v
6+15 0.0327 0.11 Q V
6+20 0.0335 0.11 Q V
6+25 0.0342 0.11 Q V
6+30 0.0350 0.11 Q V
6+35 0.0358 0.12 Q V
6+40 0.0367 0.12 Q V
6+45 0.0375 0.12 Q V
6+50 0.0383 0.12 Q V
6+55 0.0392 0.12 Q V
7+ 0 0.0400 0.12 Q V
7+ 5 0.0409 0.12 Q V
7+10 0.0417 0.12 Q V
7+15 0.0426 0.12 Q V
7+20 0.0435 0.13 Q V
7+25 0.0444 0.13 Q V
7+30 0.0453 0.13 Q V
7+35 0.0463 0.14 Q V
7+40 0.0473 0.15 Q V

Page 287 of 2775 ends

7+45 0.0483 0.15 Q V I
7+50 0.0494 0.16 Q V I
7+55 0.0505 0.16 Q V
8+ 0 0.0516 0.16 Q V I
8+ 5 0.0528 0.18 Q V I
8+10 0.0541 0.18 Q V I
8+15 0.0554 0.18 Q V I
8+20 0.0566 0.18 Q V I
8+25 0.0579 0.18 Q VI
8+30 0.0592 0.18 Q VI
8+35 0.0605 0.19 Q VI
8+40 0.0618 0.20 Q VI
8+45 0.0632 0.20 Q VI
8+50 0.0646 0.21 Q V
8+55 0.0660 0.21 Q V
9+ 0 0.0675 0.21 Q V
9+ 5 0.0690 0.23 Q V
9+10 0.0706 0.23 Q V
9+15 0.0722 0.23 Q V
9+20 0.0739 0.24 Q V
9+25 0.0756 0.24 Q V
9+30 0.0773 0.24 Q V
9+35 0.0790 0.25 IQ V
9+40 0.0808 0.26 IQ V
9+45 0.0826 0.26 IQ V
9+50 0.0844 0.27 IQ V
9+55 0.0863 0.27 IQ V
10+ 0 0.0881 0.27 IQ V
10+ 5 0.0895 0.20 Q V
10+10 0.0908 0.18 Q V
10+15 0.0920 0.18 Q V
10+20 0.0933 0.18 Q V
10+25 0.0946 0.18 Q V
10+30 0.0958 0.18 Q V
10+35 0.0974 0.23 Q V
10+40 0.0991 0.24 Q V
10+45 0.1008 0.24 Q V
10+50 0.1025 0.24 Q V
10+55 0.1042 0.24 Q V
11+ 0 0.1059 0.24 Q V
11+ 5 0.1075 0.24 Q V
11+10 0.1091 0.23 Q V
11+15 0.1107 0.23 Q V
11+20 0.1123 0.23 Q V
11+25 0.1139 0.23 Q V
11+30 0.1155 0.23 Q V
11+35 0.1170 0.21 Q V
11+40 0.1184 0.21 Q V
11+45 0.1198 0.21 Q V
11+50 0.1213 0.22 Q V
11+55 0.1229 0.22 Q V
12+ 0 0.1244 0.22 Q V
12+ 5 0.1263 0.29 Q V
12+10 0.1284 0.31 Q V
12+15 0.1306 0.31 Q V
12+20 0.1327 0.32 Q V
12+25 0.1349 0.32 Q IV
12+30 0.1371 0.32 Q IV
12+35 0.1394 0.34 Q I V
12+40 0.1418 0.34 Q I V
12+45 0.1442 0.34 Q I V
12+50 0.1466 0.35 Q V
12+55 0.1490 0.36 Q I V

Page 288 of 2775 ends

13+ 0 0.1515 0.36 Q
13+ 5 0.1542 0.40 Q
13+10 0.1571 0.42 Q
13+15 0.1600 0.42 Q
13+20 0.1628 0.42 Q
13+25 0.1657 0.42 Q
13+30 0.1686 0.42 Q
13+35 0.1707 0.31 Q
13+40 0.1727 0.28 Q
13+45 0.1746 0.28 Q
13+50 0.1766 0.28 Q
13+55 0.1785 0.28 Q
14+ 0 0.1804 0.28 Q
14+ 5 0.1826 0.32 Q
14+10 0.1849 0.33 Q
14+15 0.1872 0.33 Q
14+20 0.1894 0.32 Q
14+25 0.1916 0.32 Q
14+30 0.1938 0.32 Q
14+35 0.1960 0.32 Q
14+40 0.1982 0.32 Q
14+45 0.2004 0.32 Q
14+50 0.2025 0.31 Q
14+55 0.2046 0.31 Q
15+ 0 0.2067 0.31 Q
15+ 5 0.2087 0.30 Q
15+10 0.2108 0.29 Q
15+15 0.2128 0.29 Q
15+20 0.2148 0.28 Q
15+25 0.2167 0.28 Q
15+30 0.2186 0.28 Q
15+35 0.2203 0.24 Q
15+40 0.2219 0.23 Q
15+45 0.2235 0.23 Q
15+50 0.2251 0.23 Q
15+55 0.2267 0.23 Q
16+ 0 0.2283 0.23 Q
16+ 5 0.2290 0.09 Q
16+10 0.2293 0.05 Q
16+15 0.2296 0.05 Q
16+20 0.2300 0.05 Q
16+25 0.2303 0.05 Q
16+30 0.2306 0.05 Q
16+35 0.2309 0.04 Q
16+40 0.2312 0.04 Q
16+45 0.2314 0.04 Q
16+50 0.2317 0.04 Q
16+55 0.2319 0.04 Q
17+ 0 0.2322 0.04 Q
17+ 5 0.2326 0.06 Q
17+10 0.2330 0.06 Q
17+15 0.2334 0.06 Q
17+20 0.2338 0.06 Q
17+25 0.2343 0.06 Q
17+30 0.2347 0.06 Q
17+35 0.2351 0.06 Q
17+40 0.2355 0.06 Q
17+45 0.2359 0.06 Q
17+50 0.2363 0.05 Q
17+55 0.2366 0.05 Q
18+ 0 0.2370 0.05 Q
18+ 5 0.2373 0.05 Q
18+10 0.2376 0.05 Q
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V

Page 289 of 2775 ends

18+15 0.2380 0.05 Q
18+20 0.2383 0.05 Q
18+25 0.2387 0.05 Q
18+30 0.2390 0.05 Q
18+35 0.2393 0.04 Q
18+40 0.2395 0.04 Q
18+45 0.2398 0.04 Q
18+50 0.2400 0.03 Q
18+55 0.2401 0.02 Q
19+ 0 0.2403 0.02 Q
19+ 5 0.2405 0.03 Q
19+10 0.2408 0.04 Q
19+15 0.2410 0.04 Q
19+20 0.2414 0.05 Q
19+25 0.2417 0.05 Q
19+30 0.2420 0.05 Q
19+35 0.2423 0.04 Q
19+40 0.2426 0.04 Q
19+45 0.2428 0.04 Q
19+50 0.2430 0.03 Q
19+55 0.2432 0.02 Q
20+ 0 0.2433 0.02 Q
20+ 5 0.2436 0.03 Q
20+10 0.2438 0.04 Q
20+15 0.2441 0.04 Q
20+20 0.2443 0.04 Q
20+25 0.2446 0.04 Q
20+30 0.2448 0.04 Q
20+35 0.2451 0.04 Q
20+40 0.2453 0.04 Q
20+45 0.2456 0.04 Q
20+50 0.2458 0.03 Q
20+55 0.2459 0.02 Q
21+ 0 0.2461 0.02 Q
21+ 5 0.2464 0.03 Q
21+10 0.2466 0.04 Q
21+15 0.2469 0.04 Q
21+20 0.2470 0.03 Q
21+25 0.2472 0.02 Q
21+30 0.2474 0.02 Q
21+35 0.2476 0.03 Q
21+40 0.2479 0.04 Q
21+45 0.2481 0.04 Q
21+50 0.2483 0.03 Q
21+55 0.2485 0.02 Q
22+ 0 0.2486 0.02 Q
22+ 5 0.2489 0.03 Q
22+10 0.2491 0.04 Q
22+15 0.2494 0.04 Q
22+20 0.2496 0.03 Q
22+25 0.2497 0.02 Q
22+30 0.2499 0.02 Q
22+35 0.2501 0.02 Q
22+40 0.2502 0.02 Q
22+45 0.2504 0.02 Q
22+50 0.2506 0.02 Q
22+55 0.2508 0.02 Q
23+ 0 0.2509 0.02 Q
23+ 5 0.2511 0.02 Q
23+10 0.2513 0.02 Q
23+15 0.2514 0.02 Q
23+20 0.2516 0.02 Q
23+25 0.2518 0.02 Q
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
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Page 290 of 2775 ends

23+30 0.2519 0.02 Q
23+35 0.2521 0.02 Q
23+40 0.2523 0.02 Q
23+45 0.2524 0.02 Q
23+50 0.2526 0.02 Q
23+55 0.2528 0.02 Q
24+ 0 0.2529 0.02 Q
24+ 5 0.2530 0.01 Q
VI
VI
VI
VI
VI
VI
VI
V

Page 291 of 2775 ends

DETENTION BASIN SIZING
CALCULATION OF DETENTION BASIN OUTLET CAPACITY. THE OUTLET CONSISTS OF A RESTRICTOR PLATE 4 INCH IN DIAMETER AT THE OUTLET OF THE DETENTION BASIN.

THE SUBMERGED
ORIFICE EQUATION IS: O=0.63A(2GAH)1/2

WHERE A IS THE OPENING AREA IN SF, AH IS THE DIFFERENCE IN

DEPTHS ON EACH SIDE OF THE ORIFICE OPENING (MEASURED
FROM THE CENTROID OF THE ORIFICE OPENING). G IS EQUAL TO

32.2 FT/S.

DIAMETER OF OPENING =
AREA OF OPENING=
4 INCHES

0.087 SQUARE FEET
12 INCHES

0.785 SQUARE FEET

DEPTH OF

WATER IN
BASIN
(FT)

ASSUMED DEPTH

OF FLOW AT

ORIFICE
(FT)

CALCULATED, Q
Q=0.63A(2GAH)1/2
(FT)
BASIN
OUTLET
INVERT

ELEVATION
(FT)
PONDED
WATER

SURFACE

ELEVATION
(FT)

0.5 0.40

0.28 100
100.50

1.0 0.90

0.42 100
101.00

1.5 1.40

0.52 100
101.50

2.0 1.90

0.61 100
102.00

2.5 2.40

0.68 100
102.50

3.0 2.90

0.75 100
103.00

3.5 3.40

0.81 100
103.50

3.83 3.73

0.85 100
103.83

3.9 3.80

8.18 100
103.90

4.0 3.90

8.30 100
104.00
TOP OF LOWEST GRATE = 2953.43 TG
BOTTOM OF TANK = 2591.60'
TOP OF TANK = 2595.60'
2595.60 - 2953.43 = 0.17'

4.00-0.17=3.83'
AT A BASIN DEPTH OF 3.83', THE WATER LEVEL WITHIN THE TANK BEGINS TO BECOME GREATER THAN THE LOWEST GRATE WITHIN THE STORM DRAIN SYSTEM.

THEREFORE, STORMWATER WILL BEGIN TO BUBBLE UP THE LOWEST GRATE AND DISCHARGE OUT OF THE INLET.

TO ACCOUNT FOR THIS, AN ADDITIONAL SUBMERGED EQUATION IS CALCULATED FOR THE 12" INLET PIPE THAT IS CONNECTING THE LOWEST GRATE AND UNDERGROUND TANK.

THIS DISCHARGE VALUE IS THEN ADDED TO THE CALCULATED Q.

SEE EMERGENCY OVERFLOW EXHIBIT OFc\lage 29T2 , 2775OR REFERENCE.

BEAUMONT EMERGENCY OVERFLOW EXHIBIT
FS
2594.22 INV-IN
15" SD

STORMTECH CHAMBER
(STORAGE)
2595.60 TOP

OF TANK
2591.60 BOT

OF TANK
2591.60 INV-OUT
8" SD WITH 4"

RESTRICTOR
PLATE

STORMWATER BEGINS TO
DISCHARGE THROUGH 8"
AND 12" PVC @ 2594.43 EL
2595.43 TG
2592.32 INV
S=0.005
2591.80 I NV -I N
12" SD - FUNCTIONS AS

EMERGENCY OVERFLOW
@ WATER ELEVATION OF
2594.43 WITHIN THE TANK

CALIFORNIA
AVENUE

Page 293 of 2775 ends

SQUARE FOOTAGE OF UNDERGROUND STORAGE BASIN
525.00 (5 ROWS OF 7'x15' SC -4 MODULES)
DEPTH
(FT)

FLOW VOLUME

ACCUMULATED

ACCUMULATED
(cubic feet)
(acre-feet)

0.5 262.50

0.0060

1.0 525.00

0.0121

1.5 787.50

0.0181

2.0 1050.00

0.0241

2.5 1312.50

0.0301

3.0 1575.00

0.0362

3.5 1837.50

0.0422

3.83 2010.75

0.0462

3.9 2047.50

0.0470

4.0 2159.00

0.0496
OUTFLOW RATING DATA FOR:

OUTFLOW WITH RESTRICTOR PLATE AT 4" DIAMETER OUTLET OF BASIN PONDED
WATER

SURFACE

ELEVATION
(FT)

DEPTH OF

FLOW AT
BASIN
OUTLET
(FT)

ACCUMULATED
VOLUME
(ACRE-FEET)

OUTFLOW
CFS
0 0

0.000
0 100.5

0.5 0.006

0.28 101.0

1.0 0.012

0.42 101.5

1.5 0.018

0.52 102.0

2.0 0.024

0.61 102.5

2.5 0.030

0.68 103.0

3.0 0.036

0.75 103.5

3.5 0.042

0.81 103.83

3.83 0.046

0.85 103.9

3.9 0.047

8.18 104.0

4.0 0.050

8.30

Page 294 of 2775 ends

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 11/26/24

BEAUMONT LIBRARY REDEVELOPMENT PROJECT
2 -YEAR, 24 -HOUR STORM EVENT

DETENTION BASIN ROUTING CALCULATIONS

POST -CONDITION
Program License Serial Number 6447
********************* HYDROGRAPH INFORMATION ********************** From study/file name: BEAULIBPOST242.rte
****************************HYDROGRAPH DATA**************************** Number of intervals = 289
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.416 (CFS)
Total volume = 0.253 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000
Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000
************************************************** ******************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
User entry of depth -outflow -storage data
Total number of inflow hydrograph intervals = 289
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2)
(Ft.) (Ac.Ft)
(CFS) (Ac.Ft) (Ac.Ft)

0.000

0.500

1.000

1.500

2.000

2.500

3.000

0.000

0.006

0.012

0.018

0.024

0.030

0.036

0.000

0.280

0.420

0.520

0.610

0.680

0.750

0.000

0.005

0.011

0.016

0.022

0.028

0.033

0.000

0.007

0.013

0.020

0.026

0.032

0.039

Page 295 of 2775 ends

3.500

4.000

0.042 0.810

0.048 0.870

0.039 0.045

0.045 0.051
Hydrograph Detention Basin Routing
Graph values: 'I'= unit inflow; '0'=outflow at time shown Time Inflow Outflow Storage
(Hours) (CFS) (CFS) (Ac.Ft) .0

0.083 0.02 0.00 0.000 OI

0.167 0.02 0.01 0.000 OI

0.250 0.02 0.01 0.000 OI

0.333 0.03 0.02 0.000 OI

0.417 0.04 0.02 0.000 OI

0.500 0.04 0.03 0.001 0

0.583 0.04 0.03 0.001 0

0.667 0.04 0.03 0.001 0

0.750 0.04 0.03 0.001 0

0.833 0.05 0.04 0.001 OI

0.917 0.05 0.04 0.001 OI

1.000 0.05 0.04 0.001 0

1.083 0.04 0.04 0.001 0

1.167 0.04 0.04 0.001 IO

1.250 0.04 0.04 0.001 IO

1.333 0.04 0.04 0.001 0

1.417 0.04 0.04 0.001 0

1.500 0.04 0.04 0.001 0

1.583 0.04 0.04 0.001 0

1.667 0.04 0.04 0.001 0

1.750 0.04 0.04 0.001 0

1.833 0.05 0.04 0.001 OI

1.917 0.05 0.04 0.001 0

2.000 0.05 0.04 0.001 0

2.083 0.05 0.04 0.001 0

2.167 0.05 0.05 0.001 0

2.250 0.05 0.05 0.001 0

2.333 0.05 0.05 0.001 0

2.417 0.05 0.05 0.001 0

2.500 0.05 0.05 0.001 0

2.583 0.06 0.05 0.001 OI

2.667 0.06 0.05 0.001 0

2.750 0.06 0.05 0.001 0

2.833 0.06 0.06 0.001 0

2.917 0.06 0.06 0.001 0

3.000 0.06 0.06 0.001 0

3.083 0.06 0.06 0.001 0

3.167 0.06 0.06 0.001 0

3.250 0.06 0.06 0.001 0

3.333 0.06 0.06 0.001 0

3.417 0.06 0.06 0.001 0

3.500 0.06 0.06 0.001 0

3.583 0.06 0.06 0.001 0

3.667 0.06 0.06 0.001 0

3.750 0.06 0.06 0.001 0

3.833 0.07 0.06 0.001 OI

3.917 0.07 0.07 0.001 0

4.000 0.07 0.07 0.001 0

4.083 0.07 0.07 0.001 0

4.167 0.07 0.07 0.002 0

4.250 0.07 0.07 0.002 0

4.333 0.08 0.07 0.002 OI

4.417 0.09 0.08 0.002 OI

0.1 0.21 0.31
Depth

0.42 (Ft.)

0.00 0.01

0.02 0.03

0.04 0.05

0.05 0.06

0.06 0.06

0.07 0.07

0.08 0.07

0.07 0.07

0.07 0.08

0.08 0.08

0.09 0.09

0.10 0.10

0.10 0.11

0.11 0.11

0.11 I 0.11

0.11 0.11
I 0.12

0.12 0.12

0.13 0.13

0.13 0.14

Page 296 of 2775 ends

4.500 0.09 0.08 0.002

4.583 0.09 0.08 0.002

4.667 0.09 0.08 0.002

4.750 0.09 0.08 0.002

4.833 0.10 0.09 0.002

4.917 0.10 0.09 0.002

5.000 0.10 0.09 0.002

5.083 0.08 0.09 0.002

5.167 0.07 0.09 0.002

5.250 0.07 0.08 0.002

5.333 0.08 0.08 0.002

5.417 0.09 0.08 0.002

5.500 0.09 0.08 0.002

5.583 0.10 0.09 0.002

5.667 0.10 0.09 0.002

5.750 0.10 0.09 0.002

5.833 0.10 0.09 0.002

5.917 0.10 0.09 0.002

6.000 0.10 0.10 0.002

6.083 0.11 0.10 0.002

6.167 0.11 0.10 0.002

6.250 0.11 0.10 0.002

6.333 0.11 0.11 0.002

6.417 0.11 0.11 0.002

6.500 0.11 0.11 0.002

6.583 0.12 0.11 0.002

6.667 0.12 0.11 0.002

6.750 0.12 0.12 0.002

6.833 0.12 0.12 0.003

6.917 0.12 0.12 0.003

7.000 0.12 0.12 0.003

7.083 0.12 0.12 0.003

7.167 0.12 0.12 0.003

7.250 0.12 0.12 0.003

7.333 0.13 0.12 0.003

7.417 0.13 0.13 0.003

7.500 0.13 0.13 0.003

7.583 0.14 0.13 0.003

7.667 0.15 0.14 0.003

7.750 0.15 0.14 0.003

7.833 0.16 0.14 0.003

7.917 0.16 0.15 0.003

8.000 0.16 0.15 0.003

8.083 0.18 0.16 0.003

8.167 0.18 0.16 0.003

8.250 0.18 0.17 0.004

8.333 0.18 0.17 0.004

8.417 0.18 0.18 0.004

8.500 0.18 0.18 0.004

8.583 0.19 0.18 0.004

8.667 0.20 0.18 0.004

8.750 0.20 0.19 0.004

8.833 0.21 0.19 0.004

8.917 0.21 0.20 0.004

9.000 0.21 0.20 0.004

9.083 0.23 0.20 0.004

9.167 0.23 0.21 0.005

9.250 0.23 0.22 0.005

9.333 0.24 0.22 0.005

9.417 0.24 0.23 0.005

9.500 0.24 0.23 0.005

9.583 0.25 0.24 0.005

9.667 0.26 0.24 0.005
0 0
0 0
0I
0I
0I
0 I0
IO
0 0
O
0I
0I
0I
0 0
O
0I
0I
0I
0 0
0 0I
0I
0I
0 0
0 0
0 0
0I
OI
0I
0I
0I
OI
0 I
0I
0I
0 I
0 I
0 I
0I
0I
OI
0I
0I
0I
0I
0I
OI
Oh'
0I
0I
COI
COI
I0I
I OI
I 0I

0.14 0.14

0.15 0.15

0.15 0.16

0.16 0.16

0.15 0.15

0.16 0.16

0.17 0.17

0.18 0.18

0.19 0.19

0.19 0.20

0.20 0.21

0.21 0.21

0.21 0.22

0.22 0.22

0.23 0.23

0.24 0.25

0.25 0.26

0.27 0.28

0.29 0.30

0.31 0.31

0.32 0.32

0.33 0.34

0.34 0.35

0.36 0.36

0.38 0.39

0.40 0.41

0.42 0.42

0.43

Page 297 of 2775 ends

9.750 0.26 0.25 0.005

9.833 0.27 0.25 0.005

9.917 0.27 0.26 0.005

10.000 0.27 0.26 0.006

10.083 0.20 0.25 0.005

10.167 0.18 0.24 0.005

10.250 0.18 0.22 0.005

10.333 0.18 0.21 0.005

10.417 0.18 0.20 0.004

10.500 0.18 0.20 0.004

10.583 0.23 0.20 0.004

10.667 0.24 0.21 0.005

10.750 0.24 0.22 0.005

10.833 0.24 0.23 0.005

10.917 0.24 0.23 0.005

11.000 0.24 0.24 0.005

11.083 0.24 0.24 0.005

11.167 0.23 0.24 0.005

11.250 0.23 0.24 0.005

11.333 0.23 0.23 0.005

11.417 0.23 0.23 0.005

11.500 0.23 0.23 0.005

11.583 0.21 0.23 0.005

11.667 0.21 0.23 0.005

11.750 0.21 0.22 0.005

11.833 0.22 0.22 0.005

11.917 0.22 0.22 0.005

12.000 0.22 0.22 0.005

12.083 0.29 0.23 0.005

12.167 0.31 0.25 0.005

12.250 0.31 0.26 0.006

12.333 0.32 0.28 0.006

12.417 0.32 0.28 0.006

12.500 0.32 0.29 0.006

12.583 0.34 0.29 0.007

12.667 0.34 0.30 0.007

12.750 0.34 0.31 0.007

12.833 0.35 0.31 0.007

12.917 0.36 0.32 0.008

13.000 0.36 0.32 0.008

13.083 0.40 0.33 0.008

13.167 0.42 0.34 0.009

13.250 0.42 0.35 0.009

13.333 0.42 0.36 0.010

13.417 0.42 0.37 0.010

13.500 0.42 0.38 0.010

13.583 0.31 0.38 0.010

13.667 0.28 0.36 0.010

13.750 0.28 0.35 0.009

13.833 0.28 0.34 0.009

13.917 0.28 0.33 0.008

14.000 0.28 0.33 0.008

14.083 0.32 0.32 0.008

14.167 0.33 0.32 0.008

14.250 0.33 0.32 0.008

14.333 0.32 0.32 0.008

14.417 0.32 0.32 0.008

14.500 0.32 0.32 0.008

14.583 0.32 0.32 0.008

14.667 0.32 0.32 0.008

14.750 0.32 0.32 0.008

14.833 0.31 0.32 0.008

14.917 0.31 0.32 0.008
OI
OI
OI
OI
I 0
I 0
I 0
I 0
I01
101
ohi
I
I
0I
OI
0 0
I0
IO
IO
0 0
0 0
0 I
0 I
0 I
O I
O I
O I
O II
01 I
01 I
0 I
0 I
0 I
10 I
I 0
1 0
1 0
0 0
0 I I o
I 0
I I 0
I 10
I 0
IO
IO
I
I

0.44 0.45

0.46 0.46

0.45 0.42

0.40 0.38

0.36 0.35

0.36 0.38

0.39 0.41

0.41 0.42

0.42 0.42

0.41 0.40

0.39 0.39

0.41 0.44

0.47 0.49

0.51 0.53

0.55 0.58

0.60 0.62

0.64 0.66

0.69 0.73

0.77 0.80

0.83 0.85

0.84 0.80

0.76 0.72

0.69 0.66

0.65 0.65

0.65 0.66

0.65 0.65

0.65 0.64

0.64

Page 298 of 2775 ends

15.000 0.31 0.32 0.008

15.083 0.30 0.31 0.007

15.167 0.29 0.31 0.007

15.250 0.29 0.31 0.007

15.333 0.28 0.31 0.007

15.417 0.28 0.30 0.007

15.500 0.28 0.30 0.007

15.583 0.24 0.29 0.007

15.667 0.23 0.29 0.006

15.750 0.23 0.28 0.006

15.833 0.23 0.26 0.006

15.917 0.23 0.26 0.005

16.000 0.23 0.25 0.005

16.083 0.09 0.22 0.005 I

16.167 0.05 0.18 0.004 I

16.250 0.05 0.15 0.003 I

16.333 0.05 0.12 0.003 I

16.417 0.05 0.10 0.002 I O

16.500 0.05 0.09 0.002 I O

16.583 0.04 0.07 0.002 I O

16.667 0.04 0.06 0.001 I 0

16.750 0.04 0.06 0.001 I O

16.833 0.04 0.05 0.001 IO

16.917 0.04 0.05 0.001 IO

17.000 0.04 0.04 0.001 IO

17.083 0.06 0.04 0.001 OI

17.167 0.06 0.05 0.001 OI

17.250 0.06 0.05 0.001 OI

17.333 0.06 0.05 0.001 O

17.417 0.06 0.06 0.001 O

17.500 0.06 0.06 0.001 0

17.583 0.06 0.06 0.001 O

17.667 0.06 0.06 0.001 O

17.750 0.06 0.06 0.001 O

17.833 0.05 0.06 0.001 IO

17.917 0.05 0.06 0.001 IO

18.000 0.05 0.05 0.001 IO

18.083 0.05 0.05 0.001 IO

18.167 0.05 0.05 0.001 O

18.250 0.05 0.05 0.001 O

18.333 0.05 0.05 0.001 O

18.417 0.05 0.05 0.001 O

18.500 0.05 0.05 0.001 O

18.583 0.04 0.05 0.001 O

18.667 0.04 0.05 0.001 IO

18.750 0.04 0.04 0.001 IO

18.833 0.03 0.04 0.001 IO

18.917 0.02 0.04 0.001 IO

19.000 0.02 0.03 0.001 IO

19.083 0.03 0.03 0.001 O

19.167 0.04 0.03 0.001 O

19.250 0.04 0.03 0.001 O

19.333 0.05 0.04 0.001 OI

19.417 0.05 0.04 0.001 O

19.500 0.05 0.04 0.001 O

19.583 0.04 0.04 0.001 O

19.667 0.04 0.04 0.001 IO

19.750 0.04 0.04 0.001 IO

19.833 0.03 0.04 0.001 O

19.917 0.02 0.03 0.001 IO

20.000 0.02 0.03 0.001 IO

20.083 0.03 0.03 0.001 0

20.167 0.04 0.03 0.001 O
O
O
0 IO
I O
IO
IO
I O
I O
I O
I O
I O
I O
I O
I O
I O
O

0.63 0.62

0.61 0.60

0.59 0.58

0.57 0.55

0.52 0.49

0.47 0.46

0.44 0.40

0.33 0.26

0.21 0.18

0.15 0.13

0.11 0.10

0.09 0.08

0.08 0.08

0.09 0.09

0.10 0.10

0.11 0.11

0.11 0.10

0.10 0.09

0.09 0.09

0.08 0.08

0.07 0.06

0.06 0.06

0.06 0.07

0.07 0.08

0.07 0.07

0.07 0.06

0.06 0.06

0.06

Page 299 of 2775 ends

20.250 0.04 0.03 0.001 0

20.333 0.04 0.03 0.001 0

20.417 0.04 0.04 0.001 0

20.500 0.04 0.04 0.001 0

20.583 0.04 0.04 0.001 0

20.667 0.04 0.04 0.001 0

20.750 0.04 0.04 0.001 0

20.833 0.03 0.04 0.001 0

20.917 0.02 0.03 0.001 I0

21.000 0.02 0.03 0.001 1O

21.083 0.03 0.03 0.001 0

21.167 0.04 0.03 0.001 0

21.250 0.04 0.03 0.001 0

21.333 0.03 0.03 0.001 0

21.417 0.02 0.03 0.001 I0

21.500 0.02 0.03 0.001 I0

21.583 0.03 0.03 0.001 0

21.667 0.04 0.03 0.001 0

21.750 0.04 0.03 0.001 0

21.833 0.03 0.03 0.001 0

21.917 0.02 0.03 0.001 I0

22.000 0.02 0.03 0.001 I0

22.083 0.03 0.03 0.001 0

22.167 0.04 0.03 0.001 0

22.250 0.04 0.03 0.001 0

22.333 0.03 0.03 0.001 0

22.417 0.02 0.03 0.001 IO

22.500 0.02 0.03 0.001 I0

22.583 0.02 0.03 0.001 IO

22.667 0.02 0.03 0.001 I0

22.750 0.02 0.03 0.001 I0

22.833 0.02 0.03 0.001 0

22.917 0.02 0.03 0.001 0

23.000 0.02 0.03 0.001 0

23.083 0.02 0.02 0.001 0

23.167 0.02 0.02 0.001 0

23.250 0.02 0.02 0.001 0

23.333 0.02 0.02 0.001 0

23.417 0.02 0.02 0.001 0

23.500 0.02 0.02 0.001 0

23.583 0.02 0.02 0.001 0

23.667 0.02 0.02 0.001 0

23.750 0.02 0.02 0.001 0

23.833 0.02 0.02 0.001 0

23.917 0.02 0.02 0.001 0

24.000 0.02 0.02 0.001 0

24.083 0.01 0.02 0.000 I0

24.167 0.00 0.02 0.000 I0

24.250 0.00 0.01 0.000 0

24.333 0.00 0.01 0.000 0

24.417 0.00 0.01 0.000 0

24.500 0.00 0.00 0.000 0

24.583 0.00 0.00 0.000 0

24.667 0.00 0.00 0.000 0

24.750 0.00 0.00 0.000 0

24.833 0.00 0.00 0.000 0

24.917 0.00 0.00 0.000 0

0.06 0.06

0.06 0.05

0.05 0.06

0.06 0.06

0.06 0.05

0.05 0.06

0.06 0.06

0.05 0.05

0.06 0.06

0.05 0.05

0.05 0.04

0.04 0.04

0.04 0.03

0.02 0.02

0.01 0.01

0.01 0.00

0.00 0.00

0.00 ********:t*:t***************:t*HYDROGRAPH DATA**************************** Number of intervals = 299
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.378 (CFS)
Total volume = 0.253 (Ac.Ft)

Page 300 of 2775 ends

Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000
Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000
***********************************************************************

Page 301 of 2775 ends

Unit H y d r o g r a p h Analysis
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 11/26/24 File: BEAULIBPRE24100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6447
English (in -lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format

BEAUMONT LIBRARY REDEVELOPMENT PROJECT
100 -YEAR, 24 -HOUR STORM EVENT, HYDROGRAPH

EXISTING CONDITION
Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth -Area Areal Adjustment =
Sq. Mi.

Length along longest watercourse = 267.00(Ft.)
Length along longest watercourse measured to centroid
Length along longest watercourse = 0.051 Mi.

Length along longest watercourse measured to centroid
Difference in elevation = 5.20(Ft.)
Slope along watercourse = 102.8315 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time 0.010 Hr.

Lag time = 0.60 Min.
25% of lag time = 0.15 Min.
40% of lag time = 0.24 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area (Ac.)[1]

1.34 Rainfall(In)[2] Weighting[1*2]

2.71 3.63
100 YEAR Area rainfall data:

Area (Ac .) [1]

1.34 Rainfall(In)[2] Weighting[1*2]

6.50 8.71
STORM EVENT (YEAR) = 100.00
Area Averaged 2 -Year Rainfall = 2.710(In)
Area Averaged 100 -Year Rainfall = 6.500(In)

1.34(Ac.) = 0.002

86.00(Ft.)

0.016 Mi.

Page 302 of 2775 ends

Point rain (area averaged) = 6.500(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 6.500(In)
Sub -Area Data:

Area(Ac.)

1.340
Runoff Index

32.00 Impervious %

0.788
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F
AMC2 AMC -1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

32.0 16.2 0.870 0.788 0.253 1.000 0.253
Sum (F) = 0.253
Area averaged mean soil loss (F) (In/Hr) = 0.253
Minimum soil loss rate ((In/Hr)) = 0.126
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.269
Unit Hydrograph
DESERT S -Curve
Unit Hydrograph Data
Unit time period Time % of lag Distribution Unit Hydrograph (hrs)
Graph % (CFS)
1 0.083 829.542
100.000 1.350
Sum = 100.000 Sum= 1.350
The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain
(Hr.) Percent (In/Hr)
1 0.08 0.07 0.052
2 0.17 0.07 0.052
3 0.25 0.07 0.052
4 0.33 0.10 0.078
5 0.42 0.10 0.078
6 0.50 0.10 0.078
7 0.58 0.10 0.078
8 0.67 0.10 0.078
9 0.75 0.10 0.078
10 0.83 0.13 0.104
11 0.92 0.13 0.104
12 1.00 0.13 0.104
13 1.08 0.10 0.078
14 1.17 0.10 0.078
15 1.25 0.10 0.078
16 1.33 0.10 0.078
17 1.42 0.10 0.078
18 1.50 0.10 0.078
19 1.58 0.10 0.078
20 1.67 0.10 0.078
21 1.75 0.10 0.078
22 1.83 0.13 0.104
23 1.92 0.13 0.104
24 2.00 0.13 0.104
Loss rate(In./Hr)
Max
( 0.448)
( 0.446)
( 0.445)
( 0.443)
( 0.441)
( 0.440)
( 0.438)
( 0.436)
( 0.434)
( 0.433)
( 0.431)
( 0.429)
( 0.428)
( 0.426)
( 0.424)
( 0.422)
( 0.421)
( 0.419)
( 0.417)
( 0.416)
( 0.414)
( 0.412)
( 0.411)
( 0.409)
Low

0.014

0.021

0.028

0.021

0.028

0.028
Effective
(In/Hr)

0.038

0.057

0.076

0.057

0.076

Page 303 of 2775 ends

25 2.08 0.13 0.104 ( 0.407) 0.028 0.076
26 2.17 0.13 0.104 ( 0.406) 0.028 0.076
27 2.25 0.13 0.104 ( 0.404) 0.028 0.076
28 2.33 0.13 0.104 ( 0.403) 0.028 0.076
29 2.42 0.13 0.104 ( 0.401) 0.028 0.076
30 2.50 0.13 0.104 ( 0.399) 0.028 0.076
31 2.58 0.17 0.130 ( 0.398) 0.035 0.095
32 2.67 0.17 0.130 ( 0.396) 0.035 0.095
33 2.75 0.17 0.130 ( 0.394) 0.035 0.095
34 2.83 0.17 0.130 ( 0.393) 0.035 0.095
35 2.92 0.17 0.130 ( 0.391) 0.035 0.095
36 3.00 0.17 0.130 ( 0.390) 0.035 0.095
37 3.08 0.17 0.130 ( 0.388) 0.035 0.095
38 3.17 0.17 0.130 ( 0.386) 0.035 0.095
39 3.25 0.17 0.130 ( 0.385) 0.035 0.095
40 3.33 0.17 0.130 ( 0.383) 0.035 0.095
41 3.42 0.17 0.130 ( 0.381) 0.035 0.095
42 3.50 0.17 0.130 ( 0.380) 0.035 0.095
43 3.58 0.17 0.130 ( 0.378) 0.035 0.095
44 3.67 0.17 0.130 ( 0.377) 0.035 0.095
45 3.75 0.17 0.130 ( 0.375) 0.035 0.095
46 3.83 0.20 0.156 ( 0.374) 0.042 0.114
47 3.92 0.20 0.156 ( 0.372) 0.042 0.114
48 4.00 0.20 0.156 ( 0.370) 0.042 0.114
49 4.08 0.20 0.156 ( 0.369) 0.042 0.114
50 4.17 0.20 0.156 ( 0.367) 0.042 0.114
51 4.25 0.20 0.156 ( 0.366) 0.042 0.114
52 4.33 0.23 0.182 ( 0.364) 0.049 0.133
53 4.42 0.23 0.182 ( 0.363) 0.049 0.133
54 4.50 0.23 0.182 ( 0.361) 0.049 0.133
55 4.58 0.23 0.182 ( 0.359) 0.049 0.133
56 4.67 0.23 0.182 ( 0.358) 0.049 0.133
57 4.75 0.23 0.182 ( 0.356) 0.049 0.133
58 4.83 0.27 0.208 ( 0.355) 0.056 0.152
59 4.92 0.27 0.208 ( 0.353) 0.056 0.152
60 5.00 0.27 0.208 ( 0.352) 0.056 0.152
61 5.08 0.20 0.156 ( 0.350) 0.042 0.114
62 5.17 0.20 0.156 ( 0.349) 0.042 0.114
63 5.25 0.20 0.156 ( 0.347) 0.042 0.114
64 5.33 0.23 0.182 ( 0.346) 0.049 0.133
65 5.42 0.23 0.182 ( 0.344) 0.049 0.133
66 5.50 0.23 0.182 ( 0.343) 0.049 0.133
67 5.58 0.27 0.208 ( 0.341) 0.056 0.152
68 5.67 0.27 0.208 ( 0.340) 0.056 0.152
69 5.75 0.27 0.208 ( 0.338) 0.056 0.152
70 5.83 0.27 0.208 ( 0.337) 0.056 0.152
71 5.92 0.27 0.208 ( 0.335) 0.056 0.152
72 6.00 0.27 0.208 ( 0.334) 0.056 0.152
73 6.08 0.30 0.234 ( 0.332) 0.063 0.171
74 6.17 0.30 0.234 ( 0.331) 0.063 0.171
75 6.25 0.30 0.234 ( 0.329) 0.063 0.171
76 6.33 0.30 0.234 ( 0.328) 0.063 0.171
77 6.42 0.30 0.234 ( 0.326) 0.063 0.171
78 6.50 0.30 0.234 ( 0.325) 0.063 0.171
79 6.58 0.33 0.260 ( 0.323) 0.070 0.190
80 6.67 0.33 0.260 ( 0.322) 0.070 0.190
81 6.75 0.33 0.260 ( 0.320) 0.070 0.190
82 6.83 0.33 0.260 ( 0.319) 0.070 0.190
83 6.92 0.33 0.260 ( 0.318) 0.070 0.190
84 7.00 0.33 0.260 ( 0.316) 0.070 0.190
85 7.08 0.33 0.260 ( 0.315) 0.070 0.190
86 7.17 0.33 0.260 ( 0.313) 0.070 0.190
87 7.25 0.33 0.260 ( 0.312) 0.070 0.190

Page 304 of 2775 ends

88 7.33 0.37 0.286 ( 0.310) 0.077 0.209
89 7.42 0.37 0.286 ( 0.309) 0.077 0.209
90 7.50 0.37 0.286 ( 0.308) 0.077 0.209
91 7.58 0.40 0.312 ( 0.306) 0.084 0.228
92 7.67 0.40 0.312 ( 0.305) 0.084 0.228
93 7.75 0.40 0.312 ( 0.303) 0.084 0.228
94 7.83 0.43 0.338 ( 0.302) 0.091 0.247
95 7.92 0.43 0.338 ( 0.301) 0.091 0.247
96 8.00 0.43 0.338 ( 0.299) 0.091 0.247
97 8.08 0.50 0.390 ( 0.298) 0.105 0.285
98 8.17 0.50 0.390 ( 0.296) 0.105 0.285
99 8.25 0.50 0.390 ( 0.295) 0.105 0.285
100 8.33 0.50 0.390 ( 0.294) 0.105 0.285
101 8.42 0.50 0.390 ( 0.292) 0.105 0.285
102 8.50 0.50 0.390 ( 0.291) 0.105 0.285
103 8.58 0.53 0.416 ( 0.290) 0.112 0.304
104 8.67 0.53 0.416 ( 0.288) 0.112 0.304
105 8.75 0.53 0.416 ( 0.287) 0.112 0.304
106 8.83 0.57 0.442 ( 0.285) 0.119 0.323
107 8.92 0.57 0.442 ( 0.284) 0.119 0.323
108 9.00 0.57 0.442 ( 0.283) 0.119 0.323
109 9.08 0.63 0.494 ( 0.281) 0.133 0.361
110 9.17 0.63 0.494 ( 0.280) 0.133 0.361
111 9.25 0.63 0.494 ( 0.279) 0.133 0.361
112 9.33 0.67 0.520 ( 0.277) 0.140 0.380
113 9.42 0.67 0.520 ( 0.276) 0.140 0.380
114 9.50 0.67 0.520 ( 0.275) 0.140 0.380
115 9.58 0.70 0.546 ( 0.273) 0.147 0.399
116 9.67 0.70 0.546 ( 0.272) 0.147 0.399
117 9.75 0.70 0.546 ( 0.271) 0.147 0.399
118 9.83 0.73 0.572 ( 0.270) 0.154 0.418
119 9.92 0.73 0.572 ( 0.268) 0.154 0.418
120 10.00 0.73 0.572 ( 0.267) 0.154 0.418
121 10.08 0.50 0.390 ( 0.266) 0.105 0.285
122 10.17 0.50 0.390 ( 0.264) 0.105 0.285
123 10.25 0.50 0.390 ( 0.263) 0.105 0.285
124 10.33 0.50 0.390 ( 0.262) 0.105 0.285
125 10.42 0.50 0.390 ( 0.261) 0.105 0.285
126 10.50 0.50 0.390 ( 0.259) 0.105 0.285
127 10.58 0.67 0.520 ( 0.258) 0.140 0.380
128 10.67 0.67 0.520 ( 0.257) 0.140 0.380
129 10.75 0.67 0.520 ( 0.255) 0.140 0.380
130 10.83 0.67 0.520 ( 0.254) 0.140 0.380
131 10.92 0.67 0.520 ( 0.253) 0.140 0.380
132 11.00 0.67 0.520 ( 0.252) 0.140 0.380
133 11.08 0.63 0.494 ( 0.251) 0.133 0.361
134 11.17 0.63 0.494 ( 0.249) 0.133 0.361
135 11.25 0.63 0.494 ( 0.248) 0.133 0.361
136 11.33 0.63 0.494 ( 0.247) 0.133 0.361
137 11.42 0.63 0.494 ( 0.246) 0.133 0.361
138 11.50 0.63 0.494 ( 0.244) 0.133 0.361
139 11.58 0.57 0.442 ( 0.243) 0.119 0.323
140 11.67 0.57 0.442 ( 0.242) 0.119 0.323
141 11.75 0.57 0.442 ( 0.241) 0.119 0.323
142 11.83 0.60 0.468 ( 0.240) 0.126 0.342
143 11.92 0.60 0.468 ( 0.238) 0.126 0.342
144 12.00 0.60 0.468 ( 0.237) 0.126 0.342
145 12.08 0.83 0.650 ( 0.236) 0.175 0.475
146 12.17 0.83 0.650 ( 0.235) 0.175 0.475
147 12.25 0.83 0.650 ( 0.234) 0.175 0.475
148 12.33 0.87 0.676 ( 0.232) 0.182 0.494
149 12.42 0.87 0.676 ( 0.231) 0.182 0.494
150 12.50 0.87 0.676 ( 0.230) 0.182 0.494

Page 305 of 2775 ends

151 12.58 0.93 0.728 ( 0.229) 0.196 0.532
152 12.67 0.93 0.728 ( 0.228) 0.196 0.532
153 12.75 0.93 0.728 ( 0.227) 0.196 0.532
154 12.83 0.97 0.754 ( 0.226) 0.203 0.551
155 12.92 0.97 0.754 ( 0.224) 0.203 0.551
156 13.00 0.97 0.754 ( 0.223) 0.203 0.551
157 13.08 1.13 0.884 0.222 ( 0.238) 0.662
158 13.17 1.13 0.884 0.221 ( 0.238) 0.663
159 13.25 1.13 0.884 0.220 ( 0.238) 0.664
160 13.33 1.13 0.884 0.219 ( 0.238) 0.665
161 13.42 1.13 0.884 0.218 ( 0.238) 0.666
162 13.50 1.13 0.884 0.217 ( 0.238) 0.667
163 13.58 0.77 0.598 ( 0.215) 0.161 0.437
164 13.67 0.77 0.598 ( 0.214) 0.161 0.437
165 13.75 0.77 0.598 ( 0.213) 0.161 0.437
166 13.83 0.77 0.598 ( 0.212) 0.161 0.437
167 13.92 0.77 0.598 ( 0.211) 0.161 0.437
168 14.00 0.77 0.598 ( 0.210) 0.161 0.437
169 14.08 0.90 0.702 ( 0.209) 0.189 0.513
170 14.17 0.90 0.702 ( 0.208) 0.189 0.513
171 14.25 0.90 0.702 ( 0.207) 0.189 0.513
172 14.33 0.87 0.676 ( 0.206) 0.182 0.494
173 14.42 0.87 0.676 ( 0.205) 0.182 0.494
174 14.50 0.87 0.676 ( 0.204) 0.182 0.494
175 14.58 0.87 0.676 ( 0.203) 0.182 0.494
176 14.67 0.87 0.676 ( 0.202) 0.182 0.494
177 14.75 0.87 0.676 ( 0.201) 0.182 0.494
178 14.83 0.83 0.650 ( 0.199) 0.175 0.475
179 14.92 0.83 0.650 ( 0.198) 0.175 0.475
180 15.00 0.83 0.650 ( 0.197) 0.175 0.475
181 15.08 0.80 0.624 ( 0.196) 0.168 0.456
182 15.17 0.80 0.624 ( 0.195) 0.168 0.456
183 15.25 0.80 0.624 ( 0.194) 0.168 0.456
184 15.33 0.77 0.598 ( 0.193) 0.161 0.437
185 15.42 0.77 0.598 ( 0.192) 0.161 0.437
186 15.50 0.77 0.598 ( 0.191) 0.161 0.437
187 15.58 0.63 0.494 ( 0.190) 0.133 0.361
188 15.67 0.63 0.494 ( 0.189) 0.133 0.361
189 15.75 0.63 0.494 ( 0.189) 0.133 0.361
190 15.83 0.63 0.494 ( 0.188) 0.133 0.361
191 15.92 0.63 0.494 ( 0.187) 0.133 0.361
192 16.00 0.63 0.494 ( 0.186) 0.133 0.361
193 16.08 0.13 0.104 ( 0.185) 0.028 0.076
194 16.17 0.13 0.104 ( 0.184) 0.028 0.076
195 16.25 0.13 0.104 ( 0.183) 0.028 0.076
196 16.33 0.13 0.104 ( 0.182) 0.028 0.076
197 16.42 0.13 0.104 ( 0.181) 0.028 0.076
198 16.50 0.13 0.104 ( 0.180) 0.028 0.076
199 16.58 0.10 0.078 ( 0.179) 0.021 0.057
200 16.67 0.10 0.078 ( 0.178) 0.021 0.057
201 16.75 0.10 0.078 ( 0.177) 0.021 0.057
202 16.83 0.10 0.078 ( 0.176) 0.021 0.057
203 16.92 0.10 0.078 ( 0.176) 0.021 0.057
204 17.00 0.10 0.078 ( 0.175) 0.021 0.057
205 17.08 0.17 0.130 ( 0.174) 0.035 0.095
206 17.17 0.17 0.130 ( 0.173) 0.035 0.095
207 17.25 0.17 0.130 ( 0.172) 0.035 0.095
208 17.33 0.17 0.130 ( 0.171) 0.035 0.095
209 17.42 0.17 0.130 ( 0.170) 0.035 0.095
210 17.50 0.17 0.130 ( 0.169) 0.035 0.095
211 17.58 0.17 0.130 ( 0.169) 0.035 0.095
212 17.67 0.17 0.130 ( 0.168) 0.035 0.095
213 17.75 0.17 0.130 ( 0.167) 0.035 0.095

Page 306 of 2775 ends

214 17.83 0.13 0.104 ( 0.166) 0.028 0.076
215 17.92 0.13 0.104 ( 0.165) 0.028 0.076
216 18.00 0.13 0.104 ( 0.164) 0.028 0.076
217 18.08 0.13 0.104 ( 0.164) 0.028 0.076
218 18.17 0.13 0.104 ( 0.163) 0.028 0.076
219 18.25 0.13 0.104 ( 0.162) 0.028 0.076
220 18.33 0.13 0.104 ( 0.161) 0.028 0.076
221 18.42 0.13 0.104 ( 0.160) 0.028 0.076
222 18.50 0.13 0.104 ( 0.160) 0.028 0.076
223 18.58 0.10 0.078 ( 0.159) 0.021 0.057
224 18.67 0.10 0.078 ( 0.158) 0.021 0.057
225 18.75 0.10 0.078 ( 0.157) 0.021 0.057
226 18.83 0.07 0.052 ( 0.157) 0.014 0.038
227 18.92 0.07 0.052 ( 0.156) 0.014 0.038
228 19.00 0.07 0.052 ( 0.155) 0.014 0.038
229 19.08 0.10 0.078 ( 0.154) 0.021 0.057
230 19.17 0.10 0.078 ( 0.154) 0.021 0.057
231 19.25 0.10 0.078 ( 0.153) 0.021 0.057
232 19.33 0.13 0.104 ( 0.152) 0.028 0.076
233 19.42 0.13 0.104 ( 0.152) 0.028 0.076
234 19.50 0.13 0.104 ( 0.151) 0.028 0.076
235 19.58 0.10 0.078 ( 0.150) 0.021 0.057
236 19.67 0.10 0.078 ( 0.149) 0.021 0.057
237 19.75 0.10 0.078 ( 0.149) 0.021 0.057
238 19.83 0.07 0.052 ( 0.148) 0.014 0.038
239 19.92 0.07 0.052 ( 0.147) 0.014 0.038
240 20.00 0.07 0.052 ( 0.147) 0.014 0.038
241 20.08 0.10 0.078 ( 0.146) 0.021 0.057
242 20.17 0.10 0.078 ( 0.146) 0.021 0.057
243 20.25 0.10 0.078 ( 0.145) 0.021 0.057
244 20.33 0.10 0.078 ( 0.144) 0.021 0.057
245 20.42 0.10 0.078 ( 0.144) 0.021 0.057
246 20.50 0.10 0.078 ( 0.143) 0.021 0.057
247 20.58 0.10 0.078 ( 0.142) 0.021 0.057
248 20.67 0.10 0.078 ( 0.142) 0.021 0.057
249 20.75 0.10 0.078 ( 0.141) 0.021 0.057
250 20.83 0.07 0.052 ( 0.141) 0.014 0.038
251 20.92 0.07 0.052 ( 0.140) 0.014 0.038
252 21.00 0.07 0.052 ( 0.140) 0.014 0.038
253 21.08 0.10 0.078 ( 0.139) 0.021 0.057
254 21.17 0.10 0.078 ( 0.138) 0.021 0.057
255 21.25 0.10 0.078 ( 0.138) 0.021 0.057
256 21.33 0.07 0.052 ( 0.137) 0.014 0.038
257 21.42 0.07 0.052 ( 0.137) 0.014 0.038
258 21.50 0.07 0.052 ( 0.136) 0.014 0.038
259 21.58 0.10 0.078 ( 0.136) 0.021 0.057
260 21.67 0.10 0.078 ( 0.135) 0.021 0.057
261 21.75 0.10 0.078 ( 0.135) 0.021 0.057
262 21.83 0.07 0.052 ( 0.134) 0.014 0.038
263 21.92 0.07 0.052 ( 0.134) 0.014 0.038
264 22.00 0.07 0.052 ( 0.133) 0.014 0.038
265 22.08 0.10 0.078 ( 0.133) 0.021 0.057
266 22.17 0.10 0.078 ( 0.133) 0.021 0.057
267 22.25 0.10 0.078 ( 0.132) 0.021 0.057
268 22.33 0.07 0.052 ( 0.132) 0.014 0.038
269 22.42 0.07 0.052 ( 0.131) 0.014 0.038
270 22.50 0.07 0.052 ( 0.131) 0.014 0.038
271 22.58 0.07 0.052 ( 0.131) 0.014 0.038
272 22.67 0.07 0.052 ( 0.130) 0.014 0.038
273 22.75 0.07 0.052 ( 0.130) 0.014 0.038
274 22.83 0.07 0.052 ( 0.130) 0.014 0.038
275 22.92 0.07 0.052 ( 0.129) 0.014 0.038
276 23.00 0.07 0.052 ( 0.129) 0.014 0.038

Page 307 of 2775 ends

277 23.08
278 23.17
279 23.25
280 23.33
281 23.42
282 23.50
283 23.58
284 23.67
285 23.75
286 23.83
287 23.92
288 24.00

0.07 0.07

0.052

0.129)

0.128)

0.127)

0.126)

0.126)
(Loss Rate Not Used)
Sum = 100.0
Flood volume = Effective rainfall 4.76(In)
times area 1.3(Ac.)/[(In)/(Ft.)] =
Total soil loss = 1.74(In)
Total soil loss = 0.194(Ac.Ft)
Total rainfall = 6.50(In)
Flood volume = 23157.1 Cubic Feet
Total soil loss = 8460.1 Cubic Feet

0.014

0.038

0.038
Sum = 57.1

0.5(Ac.Ft)
Peak flow rate of this hydrograph = 0.902(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - H O U R STORM
Runoff Hydrograph
Hydrograph in 5 Minute intervals ((CFS))
Time(h+m) Volume Ac.Ft Q(CFS) 0

2.5 5.0

7.5 10.0
0+ 5 0.0004 0.05 Q I
0+10 0.0007 0.05 Q I
0+15 0.0011 0.05 Q I
0+20 0.0016 0.08 Q I
0+25 0.0021 0.08 Q I
0+30 0.0027 0.08 Q I
0+35 0.0032 0.08 Q I
0+40 0.0037 0.08 Q I
0+45 0.0042 0.08 Q I
0+50 0.0050 0.10 Q I
0+55 0.0057 0.10 Q I
1+ 0 0.0064 0.10 Q
1+ 5 0.0069 0.08 Q I
1+10 0.0074 0.08 Q I
1+15 0.0080 0.08 Q I
1+20 0.0085 0.08 Q I
1+25 0.0090 0.08 Q I
1+30 0.0096 0.08 Q I
1+35 0.0101 0.08 Q I
1+40 0.0106 0.08 Q I
1+45 0.0111 0.08 Q I
1+50 0.0118 0.10 Q
1+55 0.0126 0.10 Q I
2+ 0 0.0133 0.10 Q I
2+ 5 0.0140 0.10 QV I
2+10 0.0147 0.10 QV I
2+15 0.0154 0.10 QV I
2+20 0.0161 0.10 QV I
2+25 0.0168 0.10 QV I
2+30 0.0175 0.10 QV I

Page 308 of 2775 ends

2+35 0.0184 0.13 QV
2+40 0.0193 0.13 QV
2+45 0.0202 0.13 QV
2+50 0.0210 0.13 QV
2+55 0.0219 0.13 QV
3+ 0 0.0228 0.13 QV
3+ 5 0.0237 0.13 QV
3+10 0.0246 0.13 QV
3+15 0.0255 0.13 QV
3+20 0.0264 0.13 QV
3+25 0.0272 0.13 Q V
3+30 0.0281 0.13 Q V
3+35 0.0290 0.13 Q V
3+40 0.0299 0.13 Q V
3+45 0.0308 0.13 Q V
3+50 0.0318 0.15 Q V
3+55 0.0329 0.15 Q V
4+ 0 0.0340 0.15 Q V
4+ 5 0.0350 0.15 Q V
4+10 0.0361 0.15 Q V
4+15 0.0371 0.15 Q V
4+20 0.0384 0.18 Q V
4+25 0.0396 0.18 Q V
4+30 0.0409 0.18 Q V
4+35 0.0421 0.18 Q V
4+40 0.0433 0.18 Q V
4+45 0.0446 0.18 Q V
4+50 0.0460 0.21 Q V
4+55 0.0474 0.21 Q V
5+ 0 0.0488 0.21 Q V
5+ 5 0.0499 0.15 Q V
5+10 0.0509 0.15 Q V
5+15 0.0520 0.15 Q V
5+20 0.0532 0.18 Q V
5+25 0.0545 0.18 Q V
5+30 0.0557 0.18 Q V
5+35 0.0571 0.21 Q V
5+40 0.0585 0.21 Q V
5+45 0.0600 0.21 Q v
5+50 0.0614 0.21 Q V
5+55 0.0628 0.21 Q V
6+ 0 0.0642 0.21 Q V
6+ 5 0.0658 0.23 Q V
6+10 0.0674 0.23 Q V
6+15 0.0690 0.23 Q V
6+20 0.0706 0.23 Q V
6+25 0.0722 0.23 Q V
6+30 0.0738 0.23 Q V
6+35 0.0755 0.26 Q V
6+40 0.0773 0.26 Q V
6+45 0.0791 0.26 Q V
6+50 0.0808 0.26 Q V
6+55 0.0826 0.26 Q V
7+ 0 0.0844 0.26 Q V
7+ 5 0.0861 0.26 Q V
7+10 0.0879 0.26 Q V
7+15 0.0897 0.26 Q V
7+20 0.0916 0.28 Q V
7+25 0.0936 0.28 Q V
7+30 0.0955 0.28 Q V
7+35 0.0976 0.31 Q V
7+40 0.0997 0.31 Q V
7+45 0.1019 0.31 Q V

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7+50 0.1042 0.33 Q V I
7+55 0.1065 0.33 Q V
8+ 0 0.1088 0.33 Q V
8+ 5 0.1114 0.39 Q V I
8+10 0.1141 0.39 Q V I
8+15 0.1167 0.39 Q V I
8+20 0.1194 0.39 Q V I
8+25 0.1220 0.39 Q VI
8+30 0.1247 0.39 Q VI
8+35 0.1275 0.41 Q VI
8+40 0.1303 0.41 Q VI
8+45 0.1332 0.41 Q V
8+50 0.1362 0.44 Q V
8+55 0.1392 0.44 Q V
9+ 0 0.1422 0.44 Q V
9+ 5 0.1456 0.49 Q V
9+10 0.1489 0.49 Q V
9+15 0.1523 0.49 Q V
9+20 0.1558 0.51 Q V
9+25 0.1594 0.51 Q V
9+30 0.1629 0.51 Q V
9+35 0.1666 0.54 Q V
9+40 0.1703 0.54 Q V
9+45 0.1740 0.54 Q V
9+50 0.1779 0.56 Q V
9+55 0.1818 0.56 Q V
10+ 0 0.1857 0.56 Q V
10+ 5 0.1884 0.39 Q V
10+10 0.1910 0.39 Q V
10+15 0.1937 0.39 Q V
10+20 0.1963 0.39 Q V
10+25 0.1990 0.39 Q V
10+30 0.2016 0.39 Q V
10+35 0.2052 0.51 Q V
10+40 0.2087 0.51 Q V
10+45 0.2122 0.51 Q V
10+50 0.2158 0.51 Q V
10+55 0.2193 0.51 Q V
11+ 0 0.2228 0.51 Q V
11+ 5 0.2262 0.49 Q V
11+10 0.2296 0.49 Q V
11+15 0.2329 0.49 Q V
11+20 0.2363 0.49 Q V
11+25 0.2396 0.49 Q V
11+30 0.2430 0.49 Q V
11+35 0.2460 0.44 Q V
11+40 0.2490 0.44 Q V
11+45 0.2520 0.44 Q V
11+50 0.2552 0.46 Q V
11+55 0.2584 0.46 Q V
12+ 0 0.2616 0.46 Q V
12+ 5 0.2660 0.64 Q V
12+10 0.2704 0.64 Q V
12+15 0.2748 0.64 Q V
12+20 0.2794 0.67 Q V
12+25 0.2840 0.67 Q V
12+30 0.2886 0.67 Q V
12+35 0.2936 0.72 Q V
12+40 0.2985 0.72 Q V
12+45 0.3035 0.72 Q V
12+50 0.3086 0.74 Q V
12+55 0.3138 0.74 Q V
13+ 0 0.3189 0.74 Q V

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13+ 5 0.3250 0.89 Q
13+10 0.3312 0.90 Q
13+15 0.3374 0.90 Q
13+20 0.3436 0.90 Q
13+25 0.3498 0.90 Q
13+30 0.3560 0.90 Q
13+35 0.3601 0.59 Q
13+40 0.3641 0.59 Q
13+45 0.3682 0.59 Q
13+50 0.3723 0.59 Q
13+55 0.3763 0.59 Q
14+ 0 0.3804 0.59 Q
14+ 5 0.3852 0.69 Q
14+10 0.3899 0.69 Q
14+15 0.3947 0.69 Q
14+20 0.3993 0.67 Q
14+25 0.4039 0.67 Q
14+30 0.4085 0.67 Q
14+35 0.4131 0.67 Q
14+40 0.4177 0.67 Q
14+45 0.4223 0.67 Q
14+50 0.4267 0.64 Q
14+55 0.4312 0.64 Q
15+ 0 0.4356 0.64 Q
15+ 5 0.4398 0.62 Q
15+10 0.4441 0.62 Q
15+15 0.4483 0.62 Q
15+20 0.4524 0.59 Q
15+25 0.4564 0.59 Q
15+30 0.4605 0.59 Q
15+35 0.4639 0.49 Q
15+40 0.4672 0.49 Q
15+45 0.4706 0.49 Q
15+50 0.4740 0.49 Q
15+55 0.4773 0.49 Q
16+ 0 0.4807 0.49 Q
16+ 5 0.4814 0.10 Q
16+10 0.4821 0.10 Q
16+15 0.4828 0.10 Q
16+20 0.4835 0.10 Q
16+25 0.4842 0.10 Q
16+30 0.4849 0.10 Q
16+35 0.4855 0.08 Q
16+40 0.4860 0.08 Q
16+45 0.4865 0.08 Q
16+50 0.4870 0.08 Q
16+55 0.4876 0.08 Q
17+ 0 0.4881 0.08 Q
17+ 5 0.4890 0.13 Q
17+10 0.4899 0.13 Q
17+15 0.4908 0.13 Q
17+20 0.4916 0.13 Q
17+25 0.4925 0.13 Q
17+30 0.4934 0.13 Q
17+35 0.4943 0.13 Q
17+40 0.4952 0.13 Q
17+45 0.4961 0.13 Q
17+50 0.4968 0.10 Q
17+55 0.4975 0.10 Q
18+ 0 0.4982 0.10 Q
18+ 5 0.4989 0.10 Q
18+10 0.4996 0.10 Q
18+15 0.5003 0.10 Q
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
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V
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V
V
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18+20 0.5010 0.10 Q
18+25 0.5017 0.10 Q
18+30 0.5024 0.10 Q
18+35 0.5030 0.08 Q
18+40 0.5035 0.08 Q
18+45 0.5040 0.08 Q
18+50 0.5044 0.05 Q
18+55 0.5047 0.05 Q
19+ 0 0.5051 0.05 Q
19+ 5 0.5056 0.08 Q
19+10 0.5061 0.08 Q
19+15 0.5067 0.08 Q
19+20 0.5074 0.10 Q
19+25 0.5081 0.10 Q
19+30 0.5088 0.10 Q
19+35 0.5093 0.08 Q
19+40 0.5099 0.08 Q
19+45 0.5104 0.08 Q
19+50 0.5107 0.05 Q
19+55 0.5111 0.05 Q
20+ 0 0.5115 0.05 Q
20+ 5 0.5120 0.08 Q
20+10 0.5125 0.08 Q
20+15 0.5130 0.08 Q
20+20 0.5136 0.08 Q
20+25 0.5141 0.08 Q
20+30 0.5146 0.08 Q
20+35 0.5152 0.08 Q
20+40 0.5157 0.08 Q
20+45 0.5162 0.08 Q
20+50 0.5166 0.05 Q
20+55 0.5169 0.05 Q
21+ 0 0.5173 0.05 Q
21+ 5 0.5178 0.08 Q
21+10 0.5184 0.08 Q
21+15 0.5189 0.08 Q
21+20 0.5192 0.05 Q
21+25 0.5196 0.05 Q
21+30 0.5199 0.05 Q
21+35 0.5205 0.08 Q
21+40 0.5210 0.08 Q
21+45 0.5215 0.08 Q
21+50 0.5219 0.05 Q
21+55 0.5222 0.05 Q
22+ 0 0.5226 0.05 Q
22+ 5 0.5231 0.08 Q
22+10 0.5237 0.08 Q
22+15 0.5242 0.08 Q
22+20 0.5245 0.05 Q
22+25 0.5249 0.05 Q
22+30 0.5252 0.05 Q
22+35 0.5256 0.05 Q
22+40 0.5260 0.05 Q
22+45 0.5263 0.05 Q
22+50 0.5267 0.05 Q
22+55 0.5270 0.05 Q
23+ 0 0.5274 0.05 Q
23+ 5 0.5277 0.05 Q
23+10 0.5281 0.05 Q
23+15 0.5284 0.05 Q
23+20 0.5288 0.05 Q
23+25 0.5291 0.05 Q
23+30 0.5295 0.05 Q
V
V
V
V
V
V
V
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Page 312 of 2775 ends

23+35 0.5298 0.05 Q
23+40 0.5302 0.05 Q
23+45 0.5306 0.05 Q
23+50 0.5309 0.05 Q
23+55 0.5313 0.05 Q
24+ 0 0.5316 0.05 Q
VI
VI
VI
VI
VI
V

Page 313 of 2775 ends

Unit H y d r o g r a p h Analysis
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 11/26/24 File: beaulibpost24100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6447
English (in -lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format

BEAUMONT LIBRARY REDEVELOPMENT PROJECT
100 -YEAR, 24 -HOUR STORM EVENT, HYDROGRAPH

POST CONDITION
Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth -Area Areal Adjustment =
Sq. Mi.

1.34(Ac.) = 0.002
Length along longest watercourse = 330.00(Ft.)
Length along longest watercourse measured to centroid 169.00(Ft.) Length along longest watercourse = 0.063 Mi.

Length along longest watercourse measured to centroid 0.032 Mi.

Difference in elevation = 9.10(Ft.)
Slope along watercourse = 145.6000 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.013 Hr.

Lag time = 0.79 Min.
25% of lag time = 0.20 Min.
40% of lag time = 0.32 Min.

Unit time = 5.00 Min.

Duration of storm = 24 Hour(s)
User Entered Base Flow = 0.00(CFS)
2 YEAR Area rainfall data:

Area (Ac.)[1]

1.34 Rainfall(In)[2] Weighting[1*2]

2.71 3.63
100 YEAR Area rainfall data:

Area (Ac .) [1]

1.34 Rainfall(In)[2] Weighting[1*2]

6.50 8.71
STORM EVENT (YEAR) = 100.00
Area Averaged 2 -Year Rainfall = 2.710(In)
Area Averaged 100 -Year Rainfall = 6.500(In)

Page 314 of 2775 ends

Point rain (area averaged) = 6.500(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 6.500(In)
Sub -Area Data:

Area(Ac.)

1.340
Runoff Index

32.00 Impervious %

0.910
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F
AMC2 AMC -1 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

76.700

23.300
Sum = 100.000 Sum=

1.036

0.315

1.350
The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain
(Hr.) Percent (In/Hr)
1 0.08 0.07 0.052
2 0.17 0.07 0.052
3 0.25 0.07 0.052
4 0.33 0.10 0.078
5 0.42 0.10 0.078
6 0.50 0.10 0.078
7 0.58 0.10 0.078
8 0.67 0.10 0.078
9 0.75 0.10 0.078
10 0.83 0.13 0.104
11 0.92 0.13 0.104
12 1.00 0.13 0.104
13 1.08 0.10 0.078
14 1.17 0.10 0.078
15 1.25 0.10 0.078
16 1.33 0.10 0.078
17 1.42 0.10 0.078
18 1.50 0.10 0.078
19 1.58 0.10 0.078
20 1.67 0.10 0.078
21 1.75 0.10 0.078
22 1.83 0.13 0.104
23 1.92 0.13 0.104
Loss rate(In./Hr) Effective
Max I Low (In/Hr)

0.279) 0.009 0.043

0.278) 0.009 0.043

0.277) 0.009 0.043

0.276) 0.013 0.065

0.275) 0.013 0.065

0.274) 0.013 0.065

0.273) 0.013 0.065

0.272) 0.013 0.065

0.271) 0.013 0.065

0.270) 0.017 0.087

0.269) 0.017 0.087

0.268) 0.017 0.087

0.266) 0.013 0.065

0.265) 0.013 0.065

0.264) 0.013 0.065

0.263) 0.013 0.065

0.262) 0.013 0.065

0.261) 0.013 0.065

0.260) 0.013 0.065

0.259) 0.013 0.065

0.258) 0.013 0.065

0.257) 0.017 0.087

0.256) 0.017 0.087

Page 315 of 2775 ends

24 2.00 0.13 0.104 ( 0.255) 0.017 0.087
25 2.08 0.13 0.104 ( 0.254) 0.017 0.087
26 2.17 0.13 0.104 ( 0.253) 0.017 0.087
27 2.25 0.13 0.104 ( 0.252) 0.017 0.087
28 2.33 0.13 0.104 ( 0.251) 0.017 0.087
29 2.42 0.13 0.104 ( 0.250) 0.017 0.087
30 2.50 0.13 0.104 ( 0.249) 0.017 0.087
31 2.58 0.17 0.130 ( 0.248) 0.021 0.109
32 2.67 0.17 0.130 ( 0.247) 0.021 0.109
33 2.75 0.17 0.130 ( 0.246) 0.021 0.109
34 2.83 0.17 0.130 ( 0.245) 0.021 0.109
35 2.92 0.17 0.130 ( 0.244) 0.021 0.109
36 3.00 0.17 0.130 ( 0.243) 0.021 0.109
37 3.08 0.17 0.130 ( 0.242) 0.021 0.109
38 3.17 0.17 0.130 ( 0.241) 0.021 0.109
39 3.25 0.17 0.130 ( 0.240) 0.021 0.109
40 3.33 0.17 0.130 ( 0.239) 0.021 0.109
41 3.42 0.17 0.130 ( 0.238) 0.021 0.109
42 3.50 0.17 0.130 ( 0.237) 0.021 0.109
43 3.58 0.17 0.130 ( 0.236) 0.021 0.109
44 3.67 0.17 0.130 ( 0.235) 0.021 0.109
45 3.75 0.17 0.130 ( 0.234) 0.021 0.109
46 3.83 0.20 0.156 ( 0.233) 0.026 0.130
47 3.92 0.20 0.156 ( 0.232) 0.026 0.130
48 4.00 0.20 0.156 ( 0.231) 0.026 0.130
49 4.08 0.20 0.156 ( 0.230) 0.026 0.130
50 4.17 0.20 0.156 ( 0.229) 0.026 0.130
51 4.25 0.20 0.156 ( 0.228) 0.026 0.130
52 4.33 0.23 0.182 ( 0.227) 0.030 0.152
53 4.42 0.23 0.182 ( 0.226) 0.030 0.152
54 4.50 0.23 0.182 ( 0.225) 0.030 0.152
55 4.58 0.23 0.182 ( 0.224) 0.030 0.152
56 4.67 0.23 0.182 ( 0.223) 0.030 0.152
57 4.75 0.23 0.182 ( 0.222) 0.030 0.152
58 4.83 0.27 0.208 ( 0.221) 0.034 0.174
59 4.92 0.27 0.208 ( 0.220) 0.034 0.174
60 5.00 0.27 0.208 ( 0.219) 0.034 0.174
61 5.08 0.20 0.156 ( 0.218) 0.026 0.130
62 5.17 0.20 0.156 ( 0.217) 0.026 0.130
63 5.25 0.20 0.156 ( 0.216) 0.026 0.130
64 5.33 0.23 0.182 ( 0.215) 0.030 0.152
65 5.42 0.23 0.182 ( 0.214) 0.030 0.152
66 5.50 0.23 0.182 ( 0.214) 0.030 0.152
67 5.58 0.27 0.208 ( 0.213) 0.034 0.174
68 5.67 0.27 0.208 ( 0.212) 0.034 0.174
69 5.75 0.27 0.208 ( 0.211) 0.034 0.174
70 5.83 0.27 0.208 ( 0.210) 0.034 0.174
71 5.92 0.27 0.208 ( 0.209) 0.034 0.174
72 6.00 0.27 0.208 ( 0.208) 0.034 0.174
73 6.08 0.30 0.234 ( 0.207) 0.038 0.196
74 6.17 0.30 0.234 ( 0.206) 0.038 0.196
75 6.25 0.30 0.234 ( 0.205) 0.038 0.196
76 6.33 0.30 0.234 ( 0.204) 0.038 0.196
77 6.42 0.30 0.234 ( 0.203) 0.038 0.196
78 6.50 0.30 0.234 ( 0.202) 0.038 0.196
79 6.58 0.33 0.260 ( 0.202) 0.043 0.217
80 6.67 0.33 0.260 ( 0.201) 0.043 0.217
81 6.75 0.33 0.260 ( 0.200) 0.043 0.217
82 6.83 0.33 0.260 ( 0.199) 0.043 0.217
83 6.92 0.33 0.260 ( 0.198) 0.043 0.217
84 7.00 0.33 0.260 ( 0.197) 0.043 0.217
85 7.08 0.33 0.260 ( 0.196) 0.043 0.217
86 7.17 0.33 0.260 ( 0.195) 0.043 0.217

Page 316 of 2775 ends

87 7.25 0.33 0.260 ( 0.194) 0.043 0.217
88 7.33 0.37 0.286 ( 0.193) 0.047 0.239
89 7.42 0.37 0.286 ( 0.193) 0.047 0.239
90 7.50 0.37 0.286 ( 0.192) 0.047 0.239
91 7.58 0.40 0.312 ( 0.191) 0.051 0.261
92 7.67 0.40 0.312 ( 0.190) 0.051 0.261
93 7.75 0.40 0.312 ( 0.189) 0.051 0.261
94 7.83 0.43 0.338 ( 0.188) 0.055 0.283
95 7.92 0.43 0.338 ( 0.187) 0.055 0.283
96 8.00 0.43 0.338 ( 0.186) 0.055 0.283
97 8.08 0.50 0.390 ( 0.186) 0.064 0.326
98 8.17 0.50 0.390 ( 0.185) 0.064 0.326
99 8.25 0.50 0.390 ( 0.184) 0.064 0.326
100 8.33 0.50 0.390 ( 0.183) 0.064 0.326
101 8.42 0.50 0.390 ( 0.182) 0.064 0.326
102 8.50 0.50 0.390 ( 0.181) 0.064 0.326
103 8.58 0.53 0.416 ( 0.180) 0.068 0.348
104 8.67 0.53 0.416 ( 0.180) 0.068 0.348
105 8.75 0.53 0.416 ( 0.179) 0.068 0.348
106 8.83 0.57 0.442 ( 0.178) 0.072 0.370
107 8.92 0.57 0.442 ( 0.177) 0.072 0.370
108 9.00 0.57 0.442 ( 0.176) 0.072 0.370
109 9.08 0.63 0.494 ( 0.175) 0.081 0.413
110 9.17 0.63 0.494 ( 0.175) 0.081 0.413
111 9.25 0.63 0.494 ( 0.174) 0.081 0.413
112 9.33 0.67 0.520 ( 0.173) 0.085 0.435
113 9.42 0.67 0.520 ( 0.172) 0.085 0.435
114 9.50 0.67 0.520 ( 0.171) 0.085 0.435
115 9.58 0.70 0.546 ( 0.170) 0.090 0.456
116 9.67 0.70 0.546 ( 0.170) 0.090 0.456
117 9.75 0.70 0.546 ( 0.169) 0.090 0.456
118 9.83 0.73 0.572 ( 0.168) 0.094 0.478
119 9.92 0.73 0.572 ( 0.167) 0.094 0.478
120 10.00 0.73 0.572 ( 0.166) 0.094 0.478
121 10.08 0.50 0.390 ( 0.166) 0.064 0.326
122 10.17 0.50 0.390 ( 0.165) 0.064 0.326
123 10.25 0.50 0.390 ( 0.164) 0.064 0.326
124 10.33 0.50 0.390 ( 0.163) 0.064 0.326
125 10.42 0.50 0.390 ( 0.162) 0.064 0.326
126 10.50 0.50 0.390 ( 0.162) 0.064 0.326
127 10.58 0.67 0.520 ( 0.161) 0.085 0.435
128 10.67 0.67 0.520 ( 0.160) 0.085 0.435
129 10.75 0.67 0.520 ( 0.159) 0.085 0.435
130 10.83 0.67 0.520 ( 0.158) 0.085 0.435
131 10.92 0.67 0.520 ( 0.158) 0.085 0.435
132 11.00 0.67 0.520 ( 0.157) 0.085 0.435
133 11.08 0.63 0.494 ( 0.156) 0.081 0.413
134 11.17 0.63 0.494 ( 0.155) 0.081 0.413
135 11.25 0.63 0.494 ( 0.155) 0.081 0.413
136 11.33 0.63 0.494 ( 0.154) 0.081 0.413
137 11.42 0.63 0.494 ( 0.153) 0.081 0.413
138 11.50 0.63 0.494 ( 0.152) 0.081 0.413
139 11.58 0.57 0.442 ( 0.152) 0.072 0.370
140 11.67 0.57 0.442 ( 0.151) 0.072 0.370
141 11.75 0.57 0.442 ( 0.150) 0.072 0.370
142 11.83 0.60 0.468 ( 0.149) 0.077 0.391
143 11.92 0.60 0.468 ( 0.149) 0.077 0.391
144 12.00 0.60 0.468 ( 0.148) 0.077 0.391
145 12.08 0.83 0.650 ( 0.147) 0.107 0.543
146 12.17 0.83 0.650 ( 0.146) 0.107 0.543
147 12.25 0.83 0.650 ( 0.146) 0.107 0.543
148 12.33 0.87 0.676 ( 0.145) 0.111 0.565
149 12.42 0.87 0.676 ( 0.144) 0.111 0.565

Page 317 of 2775 ends

150 12.50 0.87 0.676 ( 0.143) 0.111 0.565
151 12.58 0.93 0.728 ( 0.143) 0.119 0.609
152 12.67 0.93 0.728 ( 0.142) 0.119 0.609
153 12.75 0.93 0.728 ( 0.141) 0.119 0.609
154 12.83 0.97 0.754 ( 0.141) 0.124 0.630
155 12.92 0.97 0.754 ( 0.140) 0.124 0.630
156 13.00 0.97 0.754 ( 0.139) 0.124 0.630
157 13.08 1.13 0.884 0.138 ( 0.145) 0.746
158 13.17 1.13 0.884 0.138 ( 0.145) 0.746
159 13.25 1.13 0.884 0.137 ( 0.145) 0.747
160 13.33 1.13 0.884 0.136 ( 0.145) 0.748
161 13.42 1.13 0.884 0.136 ( 0.145) 0.748
162 13.50 1.13 0.884 0.135 ( 0.145) 0.749
163 13.58 0.77 0.598 ( 0.134) 0.098 0.500
164 13.67 0.77 0.598 ( 0.134) 0.098 0.500
165 13.75 0.77 0.598 ( 0.133) 0.098 0.500
166 13.83 0.77 0.598 ( 0.132) 0.098 0.500
167 13.92 0.77 0.598 ( 0.132) 0.098 0.500
168 14.00 0.77 0.598 ( 0.131) 0.098 0.500
169 14.08 0.90 0.702 ( 0.130) 0.115 0.587
170 14.17 0.90 0.702 ( 0.130) 0.115 0.587
171 14.25 0.90 0.702 ( 0.129) 0.115 0.587
172 14.33 0.87 0.676 ( 0.128) 0.111 0.565
173 14.42 0.87 0.676 ( 0.128) 0.111 0.565
174 14.50 0.87 0.676 ( 0.127) 0.111 0.565
175 14.58 0.87 0.676 ( 0.126) 0.111 0.565
176 14.67 0.87 0.676 ( 0.126) 0.111 0.565
177 14.75 0.87 0.676 ( 0.125) 0.111 0.565
178 14.83 0.83 0.650 ( 0.124) 0.107 0.543
179 14.92 0.83 0.650 ( 0.124) 0.107 0.543
180 15.00 0.83 0.650 ( 0.123) 0.107 0.543
181 15.08 0.80 0.624 ( 0.122) 0.102 0.522
182 15.17 0.80 0.624 ( 0.122) 0.102 0.522
183 15.25 0.80 0.624 ( 0.121) 0.102 0.522
184 15.33 0.77 0.598 ( 0.121) 0.098 0.500
185 15.42 0.77 0.598 ( 0.120) 0.098 0.500
186 15.50 0.77 0.598 ( 0.119) 0.098 0.500
187 15.58 0.63 0.494 ( 0.119) 0.081 0.413
188 15.67 0.63 0.494 ( 0.118) 0.081 0.413
189 15.75 0.63 0.494 ( 0.117) 0.081 0.413
190 15.83 0.63 0.494 ( 0.117) 0.081 0.413
191 15.92 0.63 0.494 ( 0.116) 0.081 0.413
192 16.00 0.63 0.494 ( 0.116) 0.081 0.413
193 16.08 0.13 0.104 ( 0.115) 0.017 0.087
194 16.17 0.13 0.104 ( 0.115) 0.017 0.087
195 16.25 0.13 0.104 ( 0.114) 0.017 0.087
196 16.33 0.13 0.104 ( 0.113) 0.017 0.087
197 16.42 0.13 0.104 ( 0.113) 0.017 0.087
198 16.50 0.13 0.104 ( 0.112) 0.017 0.087
199 16.58 0.10 0.078 ( 0.112) 0.013 0.065
200 16.67 0.10 0.078 ( 0.111) 0.013 0.065
201 16.75 0.10 0.078 ( 0.110) 0.013 0.065
202 16.83 0.10 0.078 ( 0.110) 0.013 0.065
203 16.92 0.10 0.078 ( 0.109) 0.013 0.065
204 17.00 0.10 0.078 ( 0.109) 0.013 0.065
205 17.08 0.17 0.130 ( 0.108) 0.021 0.109
206 17.17 0.17 0.130 ( 0.108) 0.021 0.109
207 17.25 0.17 0.130 ( 0.107) 0.021 0.109
208 17.33 0.17 0.130 ( 0.107) 0.021 0.109
209 17.42 0.17 0.130 ( 0.106) 0.021 0.109
210 17.50 0.17 0.130 ( 0.106) 0.021 0.109
211 17.58 0.17 0.130 ( 0.105) 0.021 0.109
212 17.67 0.17 0.130 ( 0.105) 0.021 0.109

Page 318 of 2775 ends

213 17.75 0.17 0.130 ( 0.104) 0.021 0.109
214 17.83 0.13 0.104 ( 0.103) 0.017 0.087
215 17.92 0.13 0.104 ( 0.103) 0.017 0.087
216 18.00 0.13 0.104 ( 0.102) 0.017 0.087
217 18.08 0.13 0.104 ( 0.102) 0.017 0.087
218 18.17 0.13 0.104 ( 0.101) 0.017 0.087
219 18.25 0.13 0.104 ( 0.101) 0.017 0.087
220 18.33 0.13 0.104 ( 0.100) 0.017 0.087
221 18.42 0.13 0.104 ( 0.100) 0.017 0.087
222 18.50 0.13 0.104 ( 0.100) 0.017 0.087
223 18.58 0.10 0.078 ( 0.099) 0.013 0.065
224 18.67 0.10 0.078 ( 0.099) 0.013 0.065
225 18.75 0.10 0.078 ( 0.098) 0.013 0.065
226 18.83 0.07 0.052 ( 0.098) 0.009 0.043
227 18.92 0.07 0.052 ( 0.097) 0.009 0.043
228 19.00 0.07 0.052 ( 0.097) 0.009 0.043
229 19.08 0.10 0.078 ( 0.096) 0.013 0.065
230 19.17 0.10 0.078 ( 0.096) 0.013 0.065
231 19.25 0.10 0.078 ( 0.095) 0.013 0.065
232 19.33 0.13 0.104 ( 0.095) 0.017 0.087
233 19.42 0.13 0.104 ( 0.094) 0.017 0.087
234 19.50 0.13 0.104 ( 0.094) 0.017 0.087
235 19.58 0.10 0.078 ( 0.094) 0.013 0.065
236 19.67 0.10 0.078 ( 0.093) 0.013 0.065
237 19.75 0.10 0.078 ( 0.093) 0.013 0.065
238 19.83 0.07 0.052 ( 0.092) 0.009 0.043
239 19.92 0.07 0.052 ( 0.092) 0.009 0.043
240 20.00 0.07 0.052 ( 0.091) 0.009 0.043
241 20.08 0.10 0.078 ( 0.091) 0.013 0.065
242 20.17 0.10 0.078 ( 0.091) 0.013 0.065
243 20.25 0.10 0.078 ( 0.090) 0.013 0.065
244 20.33 0.10 0.078 ( 0.090) 0.013 0.065
245 20.42 0.10 0.078 ( 0.090) 0.013 0.065
246 20.50 0.10 0.078 ( 0.089) 0.013 0.065
247 20.58 0.10 0.078 ( 0.089) 0.013 0.065
248 20.67 0.10 0.078 ( 0.088) 0.013 0.065
249 20.75 0.10 0.078 ( 0.088) 0.013 0.065
250 20.83 0.07 0.052 ( 0.088) 0.009 0.043
251 20.92 0.07 0.052 ( 0.087) 0.009 0.043
252 21.00 0.07 0.052 ( 0.087) 0.009 0.043
253 21.08 0.10 0.078 ( 0.087) 0.013 0.065
254 21.17 0.10 0.078 ( 0.086) 0.013 0.065
255 21.25 0.10 0.078 ( 0.086) 0.013 0.065
256 21.33 0.07 0.052 ( 0.086) 0.009 0.043
257 21.42 0.07 0.052 ( 0.085) 0.009 0.043
258 21.50 0.07 0.052 ( 0.085) 0.009 0.043
259 21.58 0.10 0.078 ( 0.085) 0.013 0.065
260 21.67 0.10 0.078 ( 0.084) 0.013 0.065
261 21.75 0.10 0.078 ( 0.084) 0.013 0.065
262 21.83 0.07 0.052 ( 0.084) 0.009 0.043
263 21.92 0.07 0.052 ( 0.083) 0.009 0.043
264 22.00 0.07 0.052 ( 0.083) 0.009 0.043
265 22.08 0.10 0.078 ( 0.083) 0.013 0.065
266 22.17 0.10 0.078 ( 0.083) 0.013 0.065
267 22.25 0.10 0.078 ( 0.082) 0.013 0.065
268 22.33 0.07 0.052 ( 0.082) 0.009 0.043
269 22.42 0.07 0.052 ( 0.082) 0.009 0.043
270 22.50 0.07 0.052 ( 0.082) 0.009 0.043
271 22.58 0.07 0.052 ( 0.081) 0.009 0.043
272 22.67 0.07 0.052 ( 0.081) 0.009 0.043
273 22.75 0.07 0.052 ( 0.081) 0.009 0.043
274 22.83 0.07 0.052 ( 0.081) 0.009 0.043
275 22.92 0.07 0.052 ( 0.081) 0.009 0.043

Page 319 of 2775 ends

276 23.00 0.07 0.052 ( 0.080)
277 23.08 0.07 0.052 ( 0.080)
278 23.17 0.07 0.052 ( 0.080)
279 23.25 0.07 0.052 ( 0.080)
280 23.33 0.07 0.052 ( 0.080)
281 23.42 0.07 0.052 ( 0.079)
282 23.50 0.07 0.052 ( 0.079)
283 23.58 0.07 0.052 ( 0.079)
284 23.67 0.07 0.052 ( 0.079)
285 23.75 0.07 0.052 ( 0.079)
286 23.83 0.07 0.052 ( 0.079)
287 23.92 0.07 0.052 ( 0.079)
288 24.00 0.07 0.052 ( 0.079)
(Loss Rate Not Used)
Sum = 100.0
Flood volume = Effective rainfall 5.44(In)
times area 1.3(Ac.)/[(In)/(Ft.)] =
Total soil loss = 1.06(In)
Total soil loss = 0.119(Ac.Ft)
Total rainfall = 6.50(In)
Flood volume = 26452.2 Cubic Feet
Total soil loss = 5165.0 Cubic Feet

0.009

0.043

0.043
Sum = 65.3

0.6 (Ac.Ft)
Peak flow rate of this hydrograph = 1.012(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - H O U R STORM
Runoff Hydrograph
Hydrograph in 5 Minute intervals ((CFS))
Time(h+m) Volume Ac.Ft Q(CFS) 0

2.5 5.0

7.5 10.0
0+ 5 0.0003 0.05 Q
0+10 0.0007 0.06 Q
0+15 0.0011 0.06 Q
0+20 0.0017 0.08 Q
0+25 0.0023 0.09 Q
0+30 0.0029 0.09 Q
0+35 0.0035 0.09 Q
0+40 0.0041 0.09 Q
0+45 0.0047 0.09 Q
0+50 0.0055 0.11 Q
0+55 0.0063 0.12 Q
1+ 0 0.0071 0.12 Q
1+ 5 0.0077 0.09 Q
1+10 0.0084 0.09 Q
1+15 0.0090 0.09 Q
1+20 0.0096 0.09 Q
1+25 0.0102 0.09 Q
1+30 0.0108 0.09 Q
1+35 0.0114 0.09 Q
1+40 0.0120 0.09 Q
1+45 0.0126 0.09 Q
1+50 0.0134 0.11 Q
1+55 0.0142 0.12 Q
2+ 0 0.0150 0.12 Q
2+ 5 0.0158 0.12 QV
2+10 0.0166 0.12 QV
2+15 0.0174 0.12 QV
2+20 0.0182 0.12 QV
2+25 0.0190 0.12 QV

Page 320 of 2775 ends

2+30 0.0198 0.12 QV
2+35 0.0208 0.14 QV
2+40 0.0218 0.15 QV
2+45 0.0228 0.15 QV
2+50 0.0238 0.15 QV
2+55 0.0248 0.15 QV
3+ 0 0.0259 0.15 QV
3+ 5 0.0269 0.15 QV
3+10 0.0279 0.15 QV
3+15 0.0289 0.15 QV
3+20 0.0299 0.15 QV
3+25 0.0309 0.15 Q V
3+30 0.0319 0.15 Q V
3+35 0.0329 0.15 Q V
3+40 0.0339 0.15 Q V
3+45 0.0350 0.15 Q V
3+50 0.0361 0.17 Q V
3+55 0.0373 0.18 Q V
4+ 0 0.0386 0.18 Q V
4+ 5 0.0398 0.18 Q V
4+10 0.0410 0.18 Q V
4+15 0.0422 0.18 Q V
4+20 0.0436 0.20 Q V
4+25 0.0450 0.21 Q V
4+30 0.0464 0.21 Q V
4+35 0.0478 0.21 Q V
4+40 0.0492 0.21 Q V
4+45 0.0506 0.21 Q V
4+50 0.0522 0.23 Q V
4+55 0.0538 0.23 Q V
5+ 0 0.0554 0.23 Q V
5+ 5 0.0568 0.19 Q V
5+10 0.0580 0.18 Q V
5+15 0.0592 0.18 Q V
5+20 0.0606 0.20 Q V
5+25 0.0620 0.21 Q V
5+30 0.0634 0.21 Q V
5+35 0.0650 0.23 Q V
5+40 0.0666 0.23 Q v
5+45 0.0682 0.23 Q V
5+50 0.0698 0.23 Q V
5+55 0.0714 0.23 Q V
6+ 0 0.0730 0.23 Q V
6+ 5 0.0748 0.26 Q V
6+10 0.0766 0.26 Q V
6+15 0.0785 0.26 Q V
6+20 0.0803 0.26 Q V
6+25 0.0821 0.26 Q V
6+30 0.0839 0.26 Q V
6+35 0.0859 0.29 Q V
6+40 0.0879 0.29 Q V
6+45 0.0899 0.29 Q V
6+50 0.0920 0.29 Q V
6+55 0.0940 0.29 Q V
7+ 0 0.0960 0.29 Q V
7+ 5 0.0980 0.29 Q V
7+10 0.1001 0.29 Q V
7+15 0.1021 0.29 Q V
7+20 0.1043 0.32 Q V
7+25 0.1065 0.32 Q V
7+30 0.1087 0.32 Q V
7+35 0.1111 0.35 Q V
7+40 0.1135 0.35 Q V

Page 321 of 2775 ends

7+45 0.1159 0.35 IQ V I
7+50 0.1185 0.37 IQ V I
7+55 0.1212 0.38 IQ V I
8+ 0 0.1238 0.38 IQ V I
8+ 5 0.1267 0.43 IQ V I
8+10 0.1298 0.44 IQ V I
8+15 0.1328 0.44 IQ V I
8+20 0.1358 0.44 IQ V I
8+25 0.1389 0.44 Q VI
8+30 0.1419 0.44 Q VI
8+35 0.1451 0.46 Q VI
8+40 0.1483 0.47 Q VI
8+45 0.1516 0.47 Q VI
8+50 0.1549 0.49 Q V
8+55 0.1584 0.50 Q V
9+ 0 0.1618 0.50 Q V
9+ 5 0.1656 0.54 Q V
9+10 0.1694 0.56 Q V
9+15 0.1733 0.56 Q V
9+20 0.1773 0.58 Q V
9+25 0.1813 0.59 Q V
9+30 0.1853 0.59 Q V
9+35 0.1895 0.61 Q V
9+40 0.1938 0.62 Q V
9+45 0.1980 0.62 Q V
9+50 0.2024 0.64 Q V
9+55 0.2069 0.65 Q V
10+ 0 0.2113 0.65 Q V
10+ 5 0.2147 0.49 Q V
10+10 0.2177 0.44 Q V
10+15 0.2208 0.44 Q V
10+20 0.2238 0.44 Q V
10+25 0.2268 0.44 Q V
10+30 0.2299 0.44 Q V
10+35 0.2337 0.55 Q V
10+40 0.2377 0.59 Q V
10+45 0.2418 0.59 Q V
10+50 0.2458 0.59 Q V
10+55 0.2499 0.59 Q V
11+ 0 0.2539 0.59 Q V
11+ 5 0.2578 0.56 Q V
11+10 0.2616 0.56 Q V
11+15 0.2655 0.56 Q V
11+20 0.2693 0.56 Q V
11+25 0.2732 0.56 Q V
11+30 0.2770 0.56 Q V
11+35 0.2805 0.51 Q V
11+40 0.2840 0.50 Q V
11+45 0.2874 0.50 Q V
11+50 0.2910 0.52 Q V
11+55 0.2947 0.53 Q V
12+ 0 0.2983 0.53 Q V
12+ 5 0.3030 0.69 Q V
12+10 0.3081 0.73 Q V
12+15 0.3131 0.73 Q V
12+20 0.3184 0.76 Q V
12+25 0.3236 0.76 Q IV
12+30 0.3289 0.76 Q IV
12+35 0.3344 0.81 Q I V
12+40 0.3401 0.82 Q I V
12+45 0.3458 0.82 Q I V
12+50 0.3516 0.84 Q I V
12+55 0.3575 0.85 Q I V

Page 322 of 2775 ends

13+ 0 0.3633 0.85
13+ 5 0.3700 0.97
13+10 0.3769 1.01
13+15 0.3839 1.01
13+20 0.3909 1.01
13+25 0.3978 1.01
13+30 0.4048 1.01
13+35 0.4100 0.75
13+40 0.4146 0.68
13+45 0.4193 0.68
13+50 0.4239 0.68
13+55 0.4286 0.68
14+ 0 0.4332 0.68
14+ 5 0.4385 0.77
14+10 0.4440 0.79
14+15 0.4494 0.79
14+20 0.4547 0.77
14+25 0.4600 0.76
14+30 0.4653 0.76
14+35 0.4705 0.76
14+40 0.4758 0.76
14+45 0.4810 0.76
14+50 0.4861 0.74
14+55 0.4912 0.73
15+ 0 0.4963 0.73
15+ 5 0.5012 0.71
15+10 0.5060 0.70
15+15 0.5109 0.70
15+20 0.5156 0.68
15+25 0.5202 0.68
15+30 0.5249 0.68
15+35 0.5289 0.59
15+40 0.5327 0.56
15+45 0.5366 0.56
15+50 0.5404 0.56
15+55 0.5443 0.56
16+ 0 0.5481 0.56
16+ 5 0.5496 0.22
16+10 0.5504 0.12
16+15 0.5512 0.12
16+20 0.5521 0.12
16+25 0.5529 0.12
16+30 0.5537 0.12
16+35 0.5543 0.09
16+40 0.5549 0.09
16+45 0.5555 0.09
16+50 0.5561 0.09
16+55 0.5568 0.09
17+ 0 0.5574 0.09
17+ 5 0.5583 0.13
17+10 0.5593 0.15
17+15 0.5603 0.15
17+20 0.5613 0.15
17+25 0.5623 0.15
17+30 0.5633 0.15
17+35 0.5643 0.15
17+40 0.5654 0.15
17+45 0.5664 0.15
17+50 0.5672 0.12
17+55 0.5680 0.12
18+ 0 0.5688 0.12
18+ 5 0.5697 0.12
18+10 0.5705 0.12
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
4 4
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
Q
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V

Page 323 of 2775 ends

18+15 0.5713 0.12 Q
18+20 0.5721 0.12 Q
18+25 0.5729 0.12 Q
18+30 0.5737 0.12 Q
18+35 0.5744 0.09 Q
18+40 0.5750 0.09 Q
18+45 0.5756 0.09 Q
18+50 0.5760 0.07 Q
18+55 0.5764 0.06 Q
19+ 0 0.5768 0.06 Q
19+ 5 0.5774 0.08 Q
19+10 0.5780 0.09 Q
19+15 0.5786 0.09 Q
19+20 0.5794 0.11 Q
19+25 0.5802 0.12 Q
19+30 0.5810 0.12 Q
19+35 0.5816 0.09 Q
19+40 0.5822 0.09 Q
19+45 0.5828 0.09 Q
19+50 0.5833 0.07 Q
19+55 0.5837 0.06 Q
20+ 0 0.5841 0.06 Q
20+ 5 0.5847 0.08 Q
20+10 0.5853 0.09 Q
20+15 0.5859 0.09 Q
20+20 0.5865 0.09 Q
20+25 0.5871 0.09 Q
20+30 0.5877 0.09 Q
20+35 0.5883 0.09 Q
20+40 0.5889 0.09 Q
20+45 0.5895 0.09 Q
20+50 0.5900 0.07 Q
20+55 0.5904 0.06 Q
21+ 0 0.5908 0.06 Q
21+ 5 0.5913 0.08 Q
21+10 0.5919 0.09 Q
21+15 0.5926 0.09 Q
21+20 0.5930 0.07 Q
21+25 0.5934 0.06 Q
21+30 0.5938 0.06 Q
21+35 0.5944 0.08 Q
21+40 0.5950 0.09 Q
21+45 0.5956 0.09 Q
21+50 0.5960 0.07 Q
21+55 0.5964 0.06 Q
22+ 0 0.5968 0.06 Q
22+ 5 0.5974 0.08 Q
22+10 0.5980 0.09 Q
22+15 0.5986 0.09 Q
22+20 0.5991 0.07 Q
22+25 0.5995 0.06 Q
22+30 0.5999 0.06 Q
22+35 0.6003 0.06 Q
22+40 0.6007 0.06 Q
22+45 0.6011 0.06 Q
22+50 0.6015 0.06 Q
22+55 0.6019 0.06 Q
23+ 0 0.6023 0.06 Q
23+ 5 0.6027 0.06 Q
23+10 0.6031 0.06 Q
23+15 0.6035 0.06 Q
23+20 0.6039 0.06 Q
23+25 0.6043 0.06 Q
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V

Page 324 of 2775 ends

23+30 0.6047 0.06 Q
23+35 0.6051 0.06 Q
23+40 0.6055 0.06 Q
23+45 0.6060 0.06 Q
23+50 0.6064 0.06 Q
23+55 0.6068 0.06 Q
24+ 0 0.6072 0.06 Q
24+ 5 0.6073 0.01 Q
VI
VI
VI
VI
VI
VI
VI
VI

Page 325 of 2775 ends

DETENTION BASIN SIZING
CALCULATION OF DETENTION BASIN OUTLET CAPACITY. THE OUTLET CONSISTS OF A RESTRICTOR PLATE 4 INCH IN DIAMETER AT THE OUTLET OF THE DETENTION BASIN.

THE SUBMERGED
ORIFICE EQUATION IS: O=0.63A(2GAH)1/2

WHERE A IS THE OPENING AREA IN SF, AH IS THE DIFFERENCE IN

DEPTHS ON EACH SIDE OF THE ORIFICE OPENING (MEASURED
FROM THE CENTROID OF THE ORIFICE OPENING). G IS EQUAL TO

32.2 FT/S.

DIAMETER OF OPENING =
AREA OF OPENING=
4 INCHES

0.087 SQUARE FEET
12 INCHES

0.785 SQUARE FEET

DEPTH OF

WATER IN
BASIN
(FT)

ASSUMED DEPTH

OF FLOW AT

ORIFICE
(FT)

CALCULATED, Q
Q=0.63A(2GAH)1/2
(FT)
BASIN
OUTLET
INVERT

ELEVATION
(FT)
PONDED
WATER

SURFACE

ELEVATION
(FT)

0.5 0.40

0.28 100
100.50

1.0 0.90

0.42 100
101.00

1.5 1.40

0.52 100
101.50

2.0 1.90

0.61 100
102.00

2.5 2.40

0.68 100
102.50

3.0 2.90

0.75 100
103.00

3.5 3.40

0.81 100
103.50

3.83 3.73

0.85 100
103.83

3.9 3.80

8.18 100
103.90

4.0 3.90

8.30 100
104.00
TOP OF LOWEST GRATE = 2953.43 TG
BOTTOM OF TANK = 2591.60'
TOP OF TANK = 2595.60'
2595.60 - 2953.43 = 0.17'

4.00-0.17=3.83'
AT A BASIN DEPTH OF 3.83', THE WATER LEVEL WITHIN THE TANK BEGINS TO BECOME GREATER THAN THE LOWEST GRATE WITHIN THE STORM DRAIN SYSTEM.

THEREFORE, STORMWATER WILL BEGIN TO BUBBLE UP THE LOWEST GRATE AND DISCHARGE OUT OF THE INLET.

TO ACCOUNT FOR THIS, AN ADDITIONAL SUBMERGED EQUATION IS CALCULATED FOR THE 12" INLET PIPE THAT IS CONNECTING THE LOWEST GRATE AND UNDERGROUND TANK.

THIS DISCHARGE VALUE IS THEN ADDED TO THE CALCULATED Q.

SEE EMERGENCY OVERFLOW EXHIBIT Oplage 326 of G775OR REFERENCE.

BEAUMONT EMERGENCY OVERFLOW EXHIBIT
FS
2594.22 INV-IN
15" SD

STORMTECH CHAMBER
(STORAGE)
2595.60 TOP

OF TANK
2591.60 BOT

OF TANK
2591.60 INV-OUT
8" SD WITH 4"

RESTRICTOR
PLATE

STORMWATER BEGINS TO
DISCHARGE THROUGH 8"
AND 12" PVC @ 2594.43 EL
2595.43 TG
2592.32 INV
S=0.005
2591.80 I NV -I N
12" SD - FUNCTIONS AS

EMERGENCY OVERFLOW
@ WATER ELEVATION OF
2594.43 WITHIN THE TANK

CALIFORNIA
AVENUE

Page 327 of 2775 ends

SQUARE FOOTAGE OF UNDERGROUND STORAGE BASIN
525.00 (5 ROWS OF 7'x15' SC -4 MODULES)
DEPTH
(FT)

FLOW VOLUME

ACCUMULATED

ACCUMULATED
(cubic feet)
(acre-feet)

0.5 262.50

0.0060

1.0 525.00

0.0121

1.5 787.50

0.0181

2.0 1050.00

0.0241

2.5 1312.50

0.0301

3.0 1575.00

0.0362

3.5 1837.50

0.0422

3.83 2010.75

0.0462

3.9 2047.50

0.0470

4.0 2159.00

0.0496
OUTFLOW RATING DATA FOR:

OUTFLOW WITH RESTRICTOR PLATE AT 4" DIAMETER OUTLET OF BASIN PONDED
WATER

SURFACE

ELEVATION
(FT)

DEPTH OF

FLOW AT
BASIN
OUTLET
(FT)

ACCUMULATED
VOLUME
(ACRE-FEET)

OUTFLOW
CFS
0 0

0.000
0 100.5

0.5 0.006

0.28 101.0

1.0 0.012

0.42 101.5

1.5 0.018

0.52 102.0

2.0 0.024

0.61 102.5

2.5 0.030

0.68 103.0

3.0 0.036

0.75 103.5

3.5 0.042

0.81 103.83

3.83 0.046

0.85 103.9

3.9 0.047

8.18 104.0

4.0 0.050

8.30

Page 328 of 2775 ends

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 11/26/24

BEAUMONT LIBRARY REDEVELOPMENT PROJECT
100 -YEAR, 24 -HOUR STORM EVENT

DETENTION BASIN ROUTING CALCULATIONS

POST -CONDITION
Program License Serial Number 6447
********************* HYDROGRAPH INFORMATION ********************** From study/file name: BEAULIBPOST24100.rte
****************************HYDROGRAPH DATA**************************** Number of intervals = 289
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 1.012 (CFS)
Total volume = 0.607 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000
Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000
************************************************** ******************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
User entry of depth -outflow -storage data
Total number of inflow hydrograph intervals = 289
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2)
(Ft.) (Ac.Ft)
(CFS) (Ac.Ft) (Ac.Ft)

0.000

0.500

1.000

1.500

2.000

2.500

3.000

0.000

0.006

0.012

0.018

0.024

0.030

0.036

0.000

0.280

0.420

0.520

0.610

0.680

0.750

0.000

0.005

0.011

0.016

0.022

0.028

0.033

0.000

0.007

0.013

0.020

0.026

0.032

0.039

Page 329 of 2775 ends

3.500

4.000

0.042 0.810

0.048 0.870

0.039 0.045

0.045 0.051
Hydrograph Detention Basin Routing
Graph values: 'I'= unit inflow; '0'=outflow at time shown Time Inflow Outflow Storage
(Hours) (CFS) (CFS) (Ac.Ft) .0

0.083 0.05 0.01 0.000 OI

0.167 0.06 0.02 0.000 OI

0.250 0.06 0.03 0.001 OI

0.333 0.08 0.04 0.001 OI

0.417 0.09 0.05 0.001 OI

0.500 0.09 0.06 0.001 OI

0.583 0.09 0.07 0.001 0

0.667 0.09 0.07 0.002 0

0.750 0.09 0.08 0.002 0

0.833 0.11 0.08 0.002 OI

0.917 0.12 0.09 0.002 OI

1.000 0.12 0.10 0.002 0

1.083 0.09 0.10 0.002 0

1.167 0.09 0.10 0.002 IO

1.250 0.09 0.10 0.002 IO

1.333 0.09 0.09 0.002 0

1.417 0.09 0.09 0.002 0

1.500 0.09 0.09 0.002 0

1.583 0.09 0.09 0.002 0

1.667 0.09 0.09 0.002 0

1.750 0.09 0.09 0.002 0

1.833 0.11 0.09 0.002 OI

1.917 0.12 0.10 0.002 0

2.000 0.12 0.10 0.002 0

2.083 0.12 0.11 0.002 0

2.167 0.12 0.11 0.002 0

2.250 0.12 0.11 0.002 0

2.333 0.12 0.11 0.002 0

2.417 0.12 0.11 0.002 0

2.500 0.12 0.12 0.002 0

2.583 0.14 0.12 0.003 OI

2.667 0.15 0.13 0.003 OI

2.750 0.15 0.13 0.003 0

2.833 0.15 0.14 0.003 0

2.917 0.15 0.14 0.003 0

3.000 0.15 0.14 0.003 0

3.083 0.15 0.14 0.003 0

3.167 0.15 0.14 0.003 0

3.250 0.15 0.14 0.003 0

3.333 0.15 0.15 0.003 0

3.417 0.15 0.15 0.003 0

3.500 0.15 0.15 0.003 0

3.583 0.15 0.15 0.003 0

3.667 0.15 0.15 0.003 0

3.750 0.15 0.15 0.003 0

3.833 0.17 0.15 0.003 OI

3.917 0.18 0.16 0.003 OI

4.000 0.18 0.16 0.003 0

4.083 0.18 0.17 0.004 0

4.167 0.18 0.17 0.004 0

4.250 0.18 0.17 0.004 0

4.333 0.20 0.18 0.004 OI

4.417 0.21 0.18 0.004 OI

0.3 0.51 0.76
Depth

1.01 (Ft.)

0.01 0.03

0.05 0.07

0.09 0.11

0.12 0.13

0.14 0.15

0.17 0.18

0.18 0.18

0.17 0.17

0.16 0.16

0.18 0.18

0.19 0.20

0.20 0.20

0.20 0.21

0.21 0.22

0.24 0.24

0.25 0.25

0.25 0.26

0.26 0.26

0.26 0.27

0.28 0.29

0.30 0.30

0.30 0.31

0.33

Page 330 of 2775 ends

4.500 0.21 0.19 0.004

4.583 0.21 0.19 0.004

4.667 0.21 0.20 0.004

4.750 0.21 0.20 0.004

4.833 0.23 0.20 0.004

4.917 0.23 0.21 0.005

5.000 0.23 0.22 0.005

5.083 0.19 0.22 0.005

5.167 0.18 0.21 0.004

5.250 0.18 0.20 0.004

5.333 0.20 0.20 0.004

5.417 0.21 0.20 0.004

5.500 0.21 0.20 0.004

5.583 0.23 0.20 0.004

5.667 0.23 0.21 0.005

5.750 0.23 0.22 0.005

5.833 0.23 0.22 0.005

5.917 0.23 0.23 0.005

6.000 0.23 0.23 0.005

6.083 0.26 0.23 0.005

6.167 0.26 0.24 0.005

6.250 0.26 0.25 0.005

6.333 0.26 0.25 0.005

6.417 0.26 0.26 0.005

6.500 0.26 0.26 0.006

6.583 0.29 0.26 0.006

6.667 0.29 0.27 0.006

6.750 0.29 0.28 0.006

6.833 0.29 0.28 0.006

6.917 0.29 0.28 0.006

7.000 0.29 0.28 0.006

7.083 0.29 0.29 0.006

7.167 0.29 0.29 0.006

7.250 0.29 0.29 0.006

7.333 0.32 0.29 0.006

7.417 0.32 0.29 0.007

7.500 0.32 0.30 0.007

7.583 0.35 0.30 0.007

7.667 0.35 0.31 0.007

7.750 0.35 0.32 0.008

7.833 0.37 0.32 0.008

7.917 0.38 0.33 0.008

8.000 0.38 0.34 0.009

8.083 0.43 0.35 0.009

8.167 0.44 0.36 0.010

8.250 0.44 0.37 0.010

8.333 0.44 0.38 0.010

8.417 0.44 0.39 0.011

8.500 0.44 0.40 0.011

8.583 0.46 0.41 0.011

8.667 0.47 0.42 0.012

8.750 0.47 0.42 0.012

8.833 0.49 0.43 0.013

8.917 0.50 0.44 0.013

9.000 0.50 0.44 0.013

9.083 0.54 0.45 0.014

9.167 0.56 0.46 0.015

9.250 0.56 0.47 0.015

9.333 0.58 0.48 0.016

9.417 0.59 0.49 0.016

9.500 0.59 0.50 0.017

9.583 0.61 0.51 0.018

9.667 0.62 0.52 0.018
OI
0 0
0 OI
OI
OI
0 I0
I0
0 0
0 OI
OI
OI
0 0
0 OI
OI
OI
OI
0 0
OI
OI
OI
OI
OI
OI
0 0
0 OI
OI
OI
OI
0 I
OI
OI
O I
O I
O I
O I
O I
OI
OI
OI
0 I
OI
OI
O I
O I
OI
O I
O I
O I
O I
O I
O I
0 I
0 I

0.34 0.35

0.35 0.36

0.36 0.38

0.39 0.39

0.37 0.35

0.35 0.35

0.36 0.37

0.38 0.39

0.40 0.40

0.41 0.42

0.43 0.44

0.45 0.46

0.46 0.47

0.48 0.49

0.50 0.51

0.52 0.52

0.52 0.53

0.54 0.55

0.57 0.59

0.61 0.63

0.66 0.69

0.71 0.75

0.79 0.83

0.87 0.90

0.93 0.95

0.99 1.01

1.05 1.08

1.12 1.16

1.21 1.26

1.32 1.37

1.42 1.47

1.53

Page 331 of 2775 ends

9.750 0.62 0.53 0.019

9.833 0.64 0.54 0.020

9.917 0.65 0.55 0.020

10.000 0.65 0.56 0.021

10.083 0.49 0.56 0.021

10.167 0.44 0.55 0.020

10.250 0.44 0.54 0.019

10.333 0.44 0.53 0.019

10.417 0.44 0.52 0.018

10.500 0.44 0.51 0.018

10.583 0.55 0.51 0.018

10.667 0.59 0.52 0.018

10.750 0.59 0.53 0.018

10.833 0.59 0.53 0.019

10.917 0.59 0.54 0.019

11.000 0.59 0.54 0.019

11.083 0.56 0.55 0.020

11.167 0.56 0.55 0.020

11.250 0.56 0.55 0.020

11.333 0.56 0.55 0.020

11.417 0.56 0.55 0.020

11.500 0.56 0.55 0.020

11.583 0.51 0.55 0.020

11.667 0.50 0.54 0.020

11.750 0.50 0.54 0.019

11.833 0.52 0.54 0.019

11.917 0.53 0.54 0.019

12.000 0.53 0.54 0.019

12.083 0.69 0.54 0.020

12.167 0.73 0.56 0.021

12.250 0.73 0.58 0.022

12.333 0.76 0.59 0.023

12.417 0.76 0.61 0.024

12.500 0.76 0.62 0.025

12.583 0.81 0.63 0.026

12.667 0.82 0.65 0.027

12.750 0.82 0.66 0.028

12.833 0.84 0.67 0.030

12.917 0.85 0.69 0.031

13.000 0.85 0.70 0.032

13.083 0.97 0.72 0.033

13.167 1.01 0.74 0.035

13.250 1.01 0.76 0.037

13.333 1.01 0.77 0.038

13.417 1.01 0.79 0.040

13.500 1.01 0.81 0.042

13.583 0.75 0.81

13.667 0.68 0.80 0.041

13.750 0.68 0.80 0.041

13.833 0.68 0.79 0.040

13.917 0.68 0.78 0.039

14.000 0.68 0.77 0.038

14.083 0.77 0.77 0.038

14.167 0.79 0.77 0.038

14.250 0.79 0.77 0.038

14.333 0.77 0.77 0.038

14.417 0.76 0.77 0.038

14.500 0.76 0.77 0.038

14.583 0.76 0.77 0.038

14.667 0.76 0.77 0.038

14.750 0.76 0.77 0.038

14.833 0.74 0.77 0.038

14.917 0.73 0.77 0.038
O I
1O I
ID I
1O I
IIO
I 1O
I 1O
I O
I O
I O
OI
O I
O I
O I
O I
1OI
IO
IO
10 IO
IO
IO
IO
IIO
110
O
0 O
IC) I
1O
1 O
O
O
O
O
0 O
O
O
I
I
I
I
I
O I I
O
OI
OI
O
O
1O
110
I IO
I 1O
I O
I O
I O
O
OI
OI
O
O
O
0 O
O
IO
IO
I
I
I
I
I

1.58 1.63

1.68 1.73

1.74 1.68

1.62 1.57

1.52 1.47

1.46 1.49

1.53 1.56

1.60 1.62

1.64 1.65

1.66 1.66

1.67 1.67

1.66 1.64

1.61 1.60

1.59 1.59

1.63 1.72

1.81 1.91

2.00 2.08

2.17 2.27

2.37 2.46

2.56 2.65

2.77 2.92

3.07 3.20

3.34 3.46

3.54 3.45

3.38 3.31

3.25 3.19

3.16 3.17

3.18 3.19

3.18 3.18

3.17 3.17

3.17 3.16

3.14

Page 332 of 2775 ends

15.000 0.73 0.76 0.037

15.083 0.71 0.76 0.037

15.167 0.70 0.76 0.037

15.250 0.70 0.75 0.036

15.333 0.68 0.75 0.036

15.417 0.68 0.75 0.036

15.500 0.68 0.74 0.035

15.583 0.59 0.73 0.034

15.667 0.56 0.72 0.033

15.750 0.56 0.71 0.032

15.833 0.56 0.70 0.031

15.917 0.56 0.68 0.030

16.000 0.56 0.67 0.030

16.083 0.22 0.65 0.028 I

16.167 0.12 0.62 0.024 I

16.250 0.12 0.57 0.021 I

16.333 0.12 0.52 0.018 I

16.417 0.12 0.48 0.016 I

16.500 0.12 0.44 0.013 I

16.583 0.09 0.40 0.011 I

16.667 0.09 0.35 0.009 I

16.750 0.09 0.31 0.007 I

16.833 0.09 0.28 0.006 I

16.917 0.09 0.23 0.005 I O

17.000 0.09 0.19 0.004 I O

17.083 0.13 0.17 0.004 IO

17.167 0.15 0.16 0.003 IO

17.250 0.15 0.16 0.003 O

17.333 0.15 0.15 0.003 O

17.417 0.15 0.15 0.003 O

17.500 0.15 0.15 0.003 O

17.583 0.15 0.15 0.003 O

17.667 0.15 0.15 0.003 O

17.750 0.15 0.15 0.003 O

17.833 0.12 0.14 0.003 IO

17.917 0.12 0.14 0.003 IO

18.000 0.12 0.13 0.003 IO

18.083 0.12 0.13 0.003 IO

18.167 0.12 0.13 0.003 O

18.250 0.12 0.12 0.003 O

18.333 0.12 0.12 0.003 O

18.417 0.12 0.12 0.003 O

18.500 0.12 0.12 0.003 O

18.583 0.09 0.12 0.002 O

18.667 0.09 0.11 0.002 IO

18.750 0.09 0.10 0.002 IO

18.833 0.07 0.10 0.002 IO

18.917 0.06 0.09 0.002 IO

19.000 0.06 0.08 0.002 IO

19.083 0.08 0.08 0.002 O

19.167 0.09 0.08 0.002 O

19.250 0.09 0.08 0.002 O

19.333 0.11 0.09 0.002 01

19.417 0.12 0.09 0.002 (II

19.500 0.12 0.10 0.002 O

19.583 0.09 0.10 0.002 O

19.667 0.09 0.10 0.002 IO

19.750 0.09 0.10 0.002 IO

19.833 0.07 0.09 0.002 O

19.917 0.06 0.08 0.002 IO

20.000 0.06 0.08 0.002 IO

20.083 0.08 0.07 0.002 0

20.167 0.09 0.08 0.002 O
O
O
O
O
I IO
I I O
1O
IO
I I O
I I O
I O
I I O
II O
II 0
II O
JI O
II O
I O
I O
1O
O
O

3.12 3.10

3.07 3.04

3.00 2.97

2.93 2.87

2.78 2.69

2.61 2.53

2.46 2.30

2.04 1.77

1.52 1.30

1.10 0.92

0.76 0.62

0.50 0.40

0.34 0.30

0.28 0.28

0.27 0.27

0.27 0.26

0.26 0.25

0.24 0.23

0.22 0.22

0.21 0.21

0.19 0.18

0.17 0.15

0.14 0.14

0.14 0.15

0.15 0.17

0.18 0.18

0.18 0.17

0.16 0.15

0.14 0.13

0.14

Page 333 of 2775 ends

20.250 0.09 0.08 0.002 0

20.333 0.09 0.08 0.002 0

20.417 0.09 0.08 0.002 0

20.500 0.09 0.09 0.002 0

20.583 0.09 0.09 0.002 0

20.667 0.09 0.09 0.002 0

20.750 0.09 0.09 0.002 0

20.833 0.07 0.08 0.002 0

20.917 0.06 0.08 0.002 I0

21.000 0.06 0.07 0.002 I0

21.083 0.08 0.07 0.002 0

21.167 0.09 0.08 0.002 0

21.250 0.09 0.08 0.002 0

21.333 0.07 0.08 0.002 0

21.417 0.06 0.07 0.002 I0

21.500 0.06 0.07 0.001 I0

21.583 0.08 0.07 0.001 0

21.667 0.09 0.07 0.002 0

21.750 0.09 0.08 0.002 0

21.833 0.07 0.08 0.002 0

21.917 0.06 0.07 0.002 I0

22.000 0.06 0.07 0.001 I0

22.083 0.08 0.07 0.001 0

22.167 0.09 0.07 0.002 0

22.250 0.09 0.08 0.002 0

22.333 0.07 0.08 0.002 0

22.417 0.06 0.07 0.002 IO

22.500 0.06 0.07 0.001 I0

22.583 0.06 0.07 0.001 IO

22.667 0.06 0.06 0.001 I0

22.750 0.06 0.06 0.001 0

22.833 0.06 0.06 0.001 0

22.917 0.06 0.06 0.001 0

23.000 0.06 0.06 0.001 0

23.083 0.06 0.06 0.001 0

23.167 0.06 0.06 0.001 0

23.250 0.06 0.06 0.001 0

23.333 0.06 0.06 0.001 0

23.417 0.06 0.06 0.001 0

23.500 0.06 0.06 0.001 0

23.583 0.06 0.06 0.001 0

23.667 0.06 0.06 0.001 O

23.750 0.06 0.06 0.001 0

23.833 0.06 0.06 0.001 0

23.917 0.06 0.06 0.001 0

24.000 0.06 0.06 0.001 0

24.083 0.01 0.05 0.001 I0

24.167 0.00 0.04 0.001 I0

24.250 0.00 0.03 0.001 0

24.333 0.00 0.02 0.000 0

24.417 0.00 0.02 0.000 0

24.500 0.00 0.01 0.000 0

24.583 0.00 0.01 0.000 0

24.667 0.00 0.01 0.000 0

24.750 0.00 0.00 0.000 0

24.833 0.00 0.00 0.000 0

24.917 0.00 0.00 0.000 0

25.000 0.00 0.00 0.000 0

25.083 0.00 0.00 0.000 0

25.167 0.00 0.00 0.000 0

0.14 0.15

0.15 0.15

0.16 0.15

0.14 0.13

0.13 0.13

0.14 0.14

0.13 0.12

0.12 0.13

0.14 0.14

0.13 0.12

0.12 0.13

0.14 0.14

0.13 0.12

0.12 0.11

0.11 0.11

0.11 0.10

0.10 0.10

0.09 0.07

0.05 0.04

0.03 0.02

0.01 0.01

0.00 0.00

0.00 0.00
********:rt***************:t*HYDROGRAPH DATA**************************** Number of intervals = 302

Page 334 of 2775 ends

Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 0.810 (CFS)
Total volume = 0.607 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000
Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000
***********************************************************************

Page 335 of 2775 ends

Unit H y d r o g r a p h Analysis
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 03/20/25 File: beaulibpre1100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6447
English (in -lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format

BEAUMONT LIBRARY REDEVELOPMENT PROJECT
100 -YEAR 1 -HOUR STORM EVENT, HYDROGRAPH

EXISTING CONDITION
Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth -Area Areal Adjustment =
Sq. Mi.

Length along longest watercourse = 267.00(Ft.)
Length along longest watercourse measured to centroid
Length along longest watercourse = 0.051 Mi.

Length along longest watercourse measured to centroid = 0.016 Mi.

Difference in elevation = 5.20(Ft.)
Slope along watercourse = 102.8315 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.010 Hr.

Lag time = 0.60 Min.
25% of lag time = 0.15 Min.
40% of lag time = 0.24 Min.

Unit time = 5.00 Min.

Duration of storm = 1 Hour(s)
User Entered Base Flow = 0.00(CFS)

1.34(Ac.) = 0.002
2 YEAR Area rainfall data:

Area (Ac .) [1]

1.34 Rainfall(In)[2] Weighting[1*2]

0.59 0.80
100 YEAR Area rainfall data:

Area (Ac .) [1]

1.34 Rainfall(In)[2] Weighting[1*2]

1.93 2.59
STORM EVENT (YEAR) = 100.00
Area Averaged 2 -Year Rainfall = 0.594(In)
Area Averaged 100 -Year Rainfall = 1.930(In)

86.00(Ft.)

Page 336 of 2775 ends

Point rain (area averaged) = 1.930(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.930(In)
Sub -Area Data:

Area(Ac.) Runoff Index Impervious

1.340 32.00 0.788
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F
AMC2 AMC -3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

32.0 52.0 0.552 0.788 0.160 1.000 0.160
Sum (F) = 0.160
Area averaged mean soil loss (F) (In/Hr) = 0.160
Minimum soil loss rate ((In/Hr)) = 0.080
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.269
Slope of intensity -duration curve for a 1 hour storm =0.4800 Unit Hydrograph
DESERT S -Curve
Unit Hydrograph Data
Unit time period Time % of lag Distribution Unit Hydrograph (hrs)
Graph % (CFS)
1 0.083 829.542
100.000 1.350
Sum = 100.000 Sum= 1.350
The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max I Low (In/Hr)
1 0.08 4.40 1.019 0.160 ( 0.274) 0.859
2 0.17 4.50 1.042 0.160 ( 0.280) 0.882
3 0.25 5.40 1.251 0.160 ( 0.336) 1.090
4 0.33 5.40 1.251 0.160 ( 0.336) 1.090
5 0.42 5.70 1.320 0.160 ( 0.355) 1.160
6 0.50 6.40 1.482 0.160 ( 0.399) 1.322
7 0.58 7.90 1.830 0.160 ( 0.492) 1.669
8 0.67 9.10 2.108 0.160 ( 0.567) 1.947
9 0.75 12.80 2.964 0.160 ( 0.797) 2.804
10 0.83 25.60 5.929 0.160 ( 1.595) 5.769
11 0.92 7.90 1.830 0.160 ( 0.492) 1.669
12 1.00 4.90 1.135 0.160 ( 0.305) 0.975
(Loss Rate Not Used)
Sum = 100.0 Sum = 21.2
Flood volume = Effective rainfall 1.77(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.2(Ac.Ft)
Total soil loss 0.16(In)
Total soil loss = 0.018(Ac.Ft)
Total rainfall = 1.93(In)
Flood volume = 8608.5 Cubic Feet
Total soil loss = 779.3 Cubic Feet
Peak flow rate of this hydrograph = 7.794(CFS)

Page 337 of 2775 ends

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -HOURR STORM
Runoff Hydrograph
Hydrograph in 5 Minute intervals ((CFS))
Time(h+m) Volume Ac.Ft Q(CFS) 0

2.5 5.0

7.5 10.0
0+ 5 0.0080 1.16
0+10 0.0162 1.19
0+15 0.0263 1.47
0+20 0.0365 1.47
0+25 0.0473 1.57
0+30 0.0596 1.79
0+35 0.0751 2.26
0+40 0.0932 2.63
0+45 0.1193 3.79
0+50 0.1730 7.79
0+55 0.1886 2.26
1+ 0 0.1976 1.32
V Q
VQ
Q
Q V
Q V
Q V
Q V
Q V
I Q
QI
Q I
V
Q V
VI
V

Page 338 of 2775 ends

Unit H y d r o g r a p h Analysis
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018, Version 9.0 Study date 03/20/25 File: beaulibpost1100.out
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Riverside County Synthetic Unit Hydrology Method
RCFC & WCD Manual date - April 1978
Program License Serial Number 6447
English (in -lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format

BEAUMONT LIBRARY REDEVELOPMENT PROJECT
100 -YEAR 1 -HOUR STORM, HYDROGRAPH

POST CONDITION
Drainage Area = 1.34(Ac.) = 0.002 Sq. Mi.

Drainage Area for Depth -Area Areal Adjustment =
Sq. Mi.

Length along longest watercourse = 330.00(Ft.)
Length along longest watercourse measured to centroid
Length along longest watercourse = 0.063 Mi.

Length along longest watercourse measured to centroid = 0.032 Mi.

Difference in elevation = 9.10(Ft.)
Slope along watercourse = 145.6000 Ft./Mi.

Average Manning's 'N' = 0.015
Lag time = 0.013 Hr.

Lag time = 0.79 Min.
25% of lag time = 0.20 Min.
40% of lag time = 0.32 Min.

Unit time = 5.00 Min.

Duration of storm = 1 Hour(s)
User Entered Base Flow = 0.00(CFS)

1.34(Ac.) = 0.002
2 YEAR Area rainfall data:

Area (Ac .) [1]

1.34 Rainfall(In)[2] Weighting[1*2]

0.59 0.80
100 YEAR Area rainfall data:

Area (Ac .) [1]

1.34 Rainfall(In)[2] Weighting[1*2]

1.93 2.59
STORM EVENT (YEAR) = 100.00
Area Averaged 2 -Year Rainfall = 0.594(In)
Area Averaged 100 -Year Rainfall = 1.930(In)
169.00(Ft.)

Page 339 of 2775 ends

Point rain (area averaged) = 1.930(In)
Areal adjustment factor = 100.00 %
Adjusted average point rain = 1.930(In)
Sub -Area Data:

Area(Ac.) Runoff Index Impervious

1.340 32.00 0.910
Total Area Entered = 1.34(Ac.)
RI RI Infil. Rate Impervious Adj. Infil. Rate Area% F
AMC2 AMC -3 (In/Hr) (Dec.%) (In/Hr) (Dec.) (In/Hr)

32.0 52.0 0.552 0.910 0.100 1.000 0.100
Sum (F) = 0.100
Area averaged mean soil loss (F) (In/Hr) = 0.100
Minimum soil loss rate ((In/Hr)) = 0.050
(for 24 hour storm duration)
Soil low loss rate (decimal) = 0.164
Slope of intensity -duration curve for a 1 hour storm =0.4800 Unit Hydrograph
DESERT S -Curve
Unit Hydrograph Data
Unit time period Time % of lag Distribution Unit Hydrograph (hrs)
Graph % (CFS)
1 0.083
2 0.167
632.538 76.700
1265.076 23.300
Sum = 100.000 Sum=

1.036

0.315

1.350
The following loss rate calculations reflect use of the minimum calculated loss rate subtracted from the Storm Rain to produce the maximum Effective Rain value Unit Time Pattern Storm Rain Loss rate(In./Hr) Effective (Hr.) Percent (In/Hr) Max I Low (In/Hr)
1 0.08 4.40 1.019 0.100 ( 0.167) 0.919
2 0.17 4.50 1.042 0.100 ( 0.171) 0.942
3 0.25 5.40 1.251 0.100 ( 0.205) 1.151
4 0.33 5.40 1.251 0.100 ( 0.205) 1.151
5 0.42 5.70 1.320 0.100 ( 0.216) 1.220
6 0.50 6.40 1.482 0.100 ( 0.243) 1.382
7 0.58 7.90 1.830 0.100 ( 0.300) 1.730
8 0.67 9.10 2.108 0.100 ( 0.346) 2.008
9 0.75 12.80 2.964 0.100 ( 0.486) 2.865
10 0.83 25.60 5.929 0.100 ( 0.972) 5.829
11 0.92 7.90 1.830 0.100 ( 0.300) 1.730
12 1.00 4.90 1.135 0.100 ( 0.186) 1.035
(Loss Rate Not Used)
Sum = 100.0 Sum = 22.0
Flood volume = Effective rainfall 1.83(In)
times area 1.3(Ac.)/[(In)/(Ft.)] = 0.2(Ac.Ft)
Total soil loss 0.10(In)
Total soil loss = 0.011(Ac.Ft)
Total rainfall = 1.93(In)
Flood volume = 8902.2 Cubic Feet
Total soil loss = 485.6 Cubic Feet
Peak flow rate of this hydrograph = 6.943(CFS)

Page 340 of 2775 ends

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -HOURR STORM
Runoff Hydrograph
Hydrograph in 5 Minute intervals ((CFS))
Time(h+m) Volume Ac.Ft Q(CFS) 0

2.5 5.0

7.5 10.0
0+ 5 0.0066 0.95
0+10 0.0153 1.27
0+15 0.0255 1.49
0+20 0.0362 1.55
0+25 0.0474 1.63
0+30 0.0600 1.82
0+35 0.0753 2.23
0+40 0.0934 2.63
0+45 0.1182 3.60
0+50 0.1660 6.94
0+55 0.1910 3.63
1+ 0 0.2021 1.62
1+ 5 0.2044 0.33
V Q I
V Q I
VQ I
QV I
Q VI
Q IV
Q I V
Q
I Q
Q
Q
Q
V
V
Q
V
V
V
V

Page 341 of 2775 ends

DETENTION BASIN SIZING
CALCULATION OF DETENTION BASIN OUTLET CAPACITY. THE OUTLET CONSISTS OF A RESTRICTOR PLATE 4 INCH IN DIAMETER AT THE OUTLET OF THE DETENTION BASIN.

THE SUBMERGED
ORIFICE EQUATION IS: O=0.63A(2GAH)1/2

WHERE A IS THE OPENING AREA IN SF, AH IS THE DIFFERENCE IN

DEPTHS ON EACH SIDE OF THE ORIFICE OPENING (MEASURED
FROM THE CENTROID OF THE ORIFICE OPENING). G IS EQUAL TO

32.2 FT/S.

DIAMETER OF OPENING =
AREA OF OPENING=
4 INCHES

0.087 SQUARE FEET
12 INCHES

0.785 SQUARE FEET

DEPTH OF

WATER IN
BASIN
(FT)

ASSUMED DEPTH

OF FLOW AT

ORIFICE
(FT)

CALCULATED, Q
Q=0.63A(2GAH)1/2
(FT)
BASIN
OUTLET
INVERT

ELEVATION
(FT)
PONDED
WATER

SURFACE

ELEVATION
(FT)

0.5 0.40

0.28 100
100.50

1.0 0.90

0.42 100
101.00

1.5 1.40

0.52 100
101.50

2.0 1.90

0.61 100
102.00

2.5 2.40

0.68 100
102.50

3.0 2.90

0.75 100
103.00

3.5 3.40

0.81 100
103.50

3.83 3.73

0.85 100
103.83

3.9 3.80

8.18 100
103.90

4.0 3.90

8.30 100
104.00
TOP OF LOWEST GRATE = 2953.43 TG
BOTTOM OF TANK = 2591.60'
TOP OF TANK = 2595.60'
2595.60 - 2953.43 = 0.17'

4.00-0.17=3.83'
AT A BASIN DEPTH OF 3.83', THE WATER LEVEL WITHIN THE TANK BEGINS TO BECOME GREATER THAN THE LOWEST GRATE WITHIN THE STORM DRAIN SYSTEM.

THEREFORE, STORMWATER WILL BEGIN TO BUBBLE UP THE LOWEST GRATE AND DISCHARGE OUT OF THE INLET.

TO ACCOUNT FOR THIS, AN ADDITIONAL SUBMERGED EQUATION IS CALCULATED FOR THE 12" INLET PIPE THAT IS CONNECTING THE LOWEST GRATE AND UNDERGROUND TANK.

THIS DISCHARGE VALUE IS THEN ADDED TO THE CALCULATED Q.

SEE EMERGENCY OVERFLOW EXHIBIT Oplage 342 of G775OR REFERENCE.

BEAUMONT EMERGENCY OVERFLOW EXHIBIT
FS
2594.22 INV-IN
15" SD

STORMTECH CHAMBER
(STORAGE)
2595.60 TOP

OF TANK
2591.60 BOT

OF TANK
2591.60 INV-OUT
8" SD WITH 4"

RESTRICTOR
PLATE

STORMWATER BEGINS TO
DISCHARGE THROUGH 8"
AND 12" PVC @ 2594.43 EL
2595.43 TG
2592.32 INV
S=0.005
2591.80 I NV -I N
12" SD - FUNCTIONS AS

EMERGENCY OVERFLOW
@ WATER ELEVATION OF
2594.43 WITHIN THE TANK

CALIFORNIA
AVENUE

Page 343 of 2775 ends

SQUARE FOOTAGE OF UNDERGROUND STORAGE BASIN
525.00 (5 ROWS OF 7'x15' SC -4 MODULES)
DEPTH
(FT)

FLOW VOLUME

ACCUMULATED

ACCUMULATED
(cubic feet)
(acre-feet)

0.5 262.50

0.0060

1.0 525.00

0.0121

1.5 787.50

0.0181

2.0 1050.00

0.0241

2.5 1312.50

0.0301

3.0 1575.00

0.0362

3.5 1837.50

0.0422

3.83 2010.75

0.0462

3.9 2047.50

0.0470

4.0 2159.00

0.0496
OUTFLOW RATING DATA FOR:

OUTFLOW WITH RESTRICTOR PLATE AT 4" DIAMETER OUTLET OF BASIN PONDED
WATER

SURFACE

ELEVATION
(FT)

DEPTH OF

FLOW AT
BASIN
OUTLET
(FT)

ACCUMULATED
VOLUME
(ACRE-FEET)

OUTFLOW
CFS
0 0

0.000
0 100.5

0.5 0.006

0.28 101.0

1.0 0.012

0.42 101.5

1.5 0.018

0.52 102.0

2.0 0.024

0.61 102.5

2.5 0.030

0.68 103.0

3.0 0.036

0.75 103.5

3.5 0.042

0.81 103.83

3.83 0.046

0.85 103.9

3.9 0.047

8.18 104.0

4.0 0.050

8.30

Page 344 of 2775 ends

FLOOD HYDROGRAPH ROUTING PROGRAM
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2018
Study date: 03/20/25

BEAUMONT LIBRARY REDEVELOPMENT PROJECT
100 -YEAR, 1 -HOUR STORM EVENT

DETENTION BASIN ROUTING CALCULATIONS

POST -CONDITION
Program License Serial Number 6447
******************** HYDROGRAPH INFORMATION ********************** From study/file name: BEAULIBPOST1100.rte
********************HYDROGRAPH DATA**************************** Number of intervals = 13
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 6.943 (CFS)
Total volume = 0.204 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000
Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000
*********************************************************************** ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING ****
User entry of depth -outflow -storage data
Total number of inflow hydrograph intervals = 13
Hydrograph time unit = 5.000 (Min.)
Initial depth in storage basin = 0.00(Ft.)
Initial basin depth = 0.00 (Ft.)
Initial basin storage = 0.00 (Ac.Ft)
Initial basin outflow = 0.00 (CFS)
Depth vs. Storage and Depth vs. Discharge data:

Basin Depth Storage Outflow (S-O*dt/2) (S+O*dt/2)
(Ft.) (Ac.Ft) (CFS) (Ac.Ft) (Ac.Ft)

0.000

0.500

1.000

1.500

2.000

2.500

3.000

3.500

3.830

3.900

0.000

0.006

0.012

0.018

0.024

0.030

0.036

0.042

0.046

0.047

0.000

0.280

0.420

0.520

0.610

0.680

0.750

0.810

0.850

8.180

0.000

0.005

0.011

0.016

0.022

0.028

0.033

0.039

0.043

0.019

0.000

0.007

0.013

0.020

0.026

0.032

0.039

0.045

0.049

0.075

Page 345 of 2775 ends

4.000

0.050 8.300

0.021 0.079
Hydrograph Detention Basin Routing
Graph values: 'I'= unit inflow; '0'=outflow at time shown Time Inflow Outflow Storage
(Hours) (CFS) (CFS) (Ac.Ft)

0.083 0.95 0.13 0.003

0.167 1.27 0.35 0.009

0.250 1.49 0.48 0.015

0.333 1.55 0.58 0.022

0.417 1.63 0.67 0.029

0.500 1.82 0.75 0.036

0.583 2.23 0.83 0.044 0

0.667 2.63 3.45 0.046

0.750 3.60 2.80 0.046

0.833 6.94 7.55 0.047

0.917 3.63 3.19 0.046

1.000 1.62 2.10 0.046

1.083 0.33 0.82 0.043 I 0

1.167 0.00 0.77 0.038 I 0

1.250 0.00 0.72 0.033 I 0

1.333 0.00 0.66 0.029 I 0

1.417 0.00 0.61 0.024 I O

1.500 0.00 0.55 0.020 I 0

1.583 0.00 0.50 0.017 I 0

1.667 0.00 0.44 0.013 I 0

1.750 0.00 0.38 0.010 IO

1.833 0.00 0.33 0.008 IO

1.917 0.00 0.28 0.006 IO

2.000 0.00 0.20 0.004 0

2.083 0.00 0.14 0.003 O

2.167 0.00 0.10 0.002 0

2.250 0.00 0.08 0.002 O

2.333 0.00 0.05 0.001 O

2.417 0.00 0.04 0.001 O

2.500 0.00 0.03 0.001 O

2.583 0.00 0.02 0.000 O

2.667 0.00 0.01 0.000 O

2.750 0.00 0.01 0.000 0

2.833 0.00 0.01 0.000 O

2.917 0.00 0.01 0.000 0

3.000 0.00 0.00 0.000 O

3.083 0.00 0.00 0.000 0

3.167 0.00 0.00 0.000 0

3.250 0.00 0.00 0.000 0

3.333 0.00 0.00 0.000 O

3.417 0.00 0.00 0.000 O
I
0 I
I 0
0 0

3.47 5.21 6.94
Depth
(Ft.)

0.24 0.74

1.29 1.86

2.41 2.99

3.70 3.85

3.85 3.89

3.85 3.84

3.57 3.20

2.78 2.38

2.01 1.68

1.38 1.11

0.87 0.67

0.49 0.36

0.26 0.19

0.14 0.10

0.07 0.05

0.04 0.03

0.02 0.01

0.01 0.01

0.01 0.00

0.00 0.00

0.00 ****************************HYDROGRAPH DATA*********:r****************** Number of intervals = 41
Time interval = 5.0 (Min.)
Maximum/Peak flow rate = 7.554 (CFS)
Total volume = 0.204 (Ac.Ft)
Status of hydrographs being held in storage
Stream 1 Stream 2 Stream 3 Stream 4 Stream 5
Peak (CFS) 0.000 0.000 0.000 0.000 0.000
Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000
***********************************************************************

Page 346 of 2775 ends

DETENTION BASIN DRAWDOWN TIME CALCULATIONS

CALCULATION OF DETENTION BASIN DRAWDOWN TIME

THE SUBMERGED
ORIFICE EQUATION IS: A 2gh
Q(h) is the discharge at a given height h,
Cd is the discharge coefficient,
A is the area of the orifice,
y is the acceleration due to gravity,
h is the height of the fluid above the orifice.

TO CALCULATE TIME (t) IT TAKES TO DRAIN THE TANK, INTEGRATION OF THE SUBMERGED ORIFICE EQUATION IS NEEDED.
dV
dt
— Atsa.nkH
d A dHI
di dt
iltank
At dt
Ca 2
Cd A
2g dot
VII Ate
V = VOLUME
t=TIME

Page 347 of 2775 ends

dB' C,4A 29 cat
o
Jo t
2`H
tH 2v/
H
— 2g t
II( tank
— =2 1
70 Cd
20 10 _ vi2g t
t san
2Atank 1'' H()
Cross Sectional Area of the Basin (Atank, sqft) = 539.75 Discharge Coefficient (Cd) = 0.63
Area of the Orifice (A, sqft) = 0.087
Height of Tank (Ho, ft) = 4
Gravity (g, ft/s) = 32.2
Detention Basin Drawdown Time (t, seconds) = 4894
Detention Basin Drawdown Time (t, hours) = 1.36

Page 348 of 2775 ends

FS: 2599.10'
FS: 2598.82'
LOWERED INLET IE FROM 2594.26' TO
2594.22' TO FIT PIPE WITHIN MODULE.
11'-9"
010" OPENING FOR 08" PVC,
OUTLET INVERT: 2591.47'. �1
030" FRAME & GRATE,
RIM: ±2599.09'. SEE DETAIL A
SHEET 2 OF 4.
! / X
i///
i
45°
FS: 2599.13'
016"x 29" OBROUND OPENING FOR
012" PVC,
INLET INVERT: 2591.80'.

FS: 2598.86'
12'-374"
r -
48' 072"
B1
018" DOGHOUSE OPENING FOR 015" PVC,
INLET INVERT: 2594.22'.
24'-O74"
STORMCAPTURE MODULES BY OLDCASTLE INFRASTRUCTURE.

INSIDE DIMENSIONS: 7' W x 15' L x 4' H, SYSTEM INVERT: 2591.47'.

C
C
I
r -
F
L
/

DESIGN NOTES

1. LIVE LOADING CRITERIA:

A. AASHTO HS -20-44 DESIGN TRUCK (WITH IMPACT AT 0.50FT MINIMUM COVER) B. LATERAL LIVE LOAD SURCHARGE: 80 PSF (TO 8.00FT DEPTH) C. NO LATERAL SURCHARGE(S) FROM ANY ADJACENT BUILDINGS, WALLS, FOUNDATIONS, OR ANY ADDITIONAL SITE ELEMENTS.

2. SOIL LOADING CRITERIA:

A. SOIL COVER DEPTH: 0.50FT (MIN.) - 5.00FT (MAX.)
B. SOIL UNIT WEIGHT: 120 PCF
C. ASSUMED WATER TABLE ELEVATION: BELOW BOTTOM OF PRECAST D. REQUIRED ALLOWABLE BEARING PRESSURE: 2,500 PSF
E. EQUIVALENT LATERAL FLUID PRESSURE, ACTIVE: 45 PCF (DRAINED) F. EQUIVALENT LATERAL FLUID PRESSURE, AT -REST: 60 PCF (DRAINED) G. EQUIVALENT LATERAL FLUID PRESSURE, PASSIVE: 150 PCF (DRAINED) H. ASSUMED COEFFICIENT OF FRICTION: 0.40
I. SEISMIC LATERAL EARTH PRESSURES: 30.5H PCF (APPLIED AS INVERTED TRIANGLE)

3. STORMCAPTURE MODULE TYPE: DETENTION (SOILTIGHT).

4. CONCRETE (NORMAL WEIGHT):

A. MIN. 28 -DAY COMPRESSIVE STRENGTH: 6,000 PSI
B. CEMENT: ASTM C150

5. STEEL REINFORCEMENT: ASTM A615 / A706 (GRADE 60), ASTM A1064 (GRADE 80)

6. REFERENCE STANDARDS: ASTM C913 & C890, ACI 318-14

PLAN VIEW
SCALE: 1/4" = 1'-0"

MODULE GAP, TYPICAL

SEE MODULE JOINT DETAIL
ON SHEET 3 OF 4.

KNOCK OUT TERMADUCTS
IN THIS/THESE LOCATIONS.

BILL OF MATERIALS
TYPE
QTY
HEIGHT
STD
NOTES
B1
C
El
F
4'
4'
4'
4'
2 TOTALS

TOP SLAB
4' BOTTOM
5 5
030" FRAME & COVER
030"x6" GRADE RING
030"x12" GRADE RING
2 VOLUME
2,159
CUBIC
FEET
BUTYL ROPE - CS 102
JOINT WRAP - CS 212

GEOTEXTILE FABRIC
21 ROLLS
ROLL
ROLL
16'-O74"
Detention/
Infiltration

UPDATED PER COMMENTS
2/10/25
REV

DESCRIPTION
DATE
a
Oldcastle Infrastructure

A WICOMANY
Ph: 800.579.8819 www.oldcastleinfrastructure.com/stormwater THIS DOCUMENT IS THE PROPERTY OF OLDCASTLE INFRASTRUCTURE, INC.

IT IS CONFIDENTIAL, SUBMITTED FOR REFERENCE PURPOSES ONLY AND SHALL NOT BE USED IN ANY WAY INJURIOUS TO THE INTERESTS OF. OR WITHOUT THE WRITTEN PERMISSION OF OLDCASTLE INFRASTRUCTURE, INC.

STORMCAPTURE ®

DETENTION SYSTEM

SYSTEM ID
CUSTOMER:

BKF Engineers
JOB NAME: BEAUMONT LIBRARY ADDITION
AND RENOVATION - Beaumont, CA
DATE
1/10/24

PLAN -N
MFG
070 -FO
DRAWN
PPS

ENGINEER
HMF

CHECKED
HMF
JOB NUMBER:
24-1202202

SALES ORDER
S302167-3
SHEET
1 OF 4

DRAWING NAME

SUBMITTAL DRAWING
P _
age
349 0- 2-75

REVIEWING NOTES

1. THIS SYSTEM HAS BEEN DESIGNED PER THE DESIGN PARAMETERS SPECIFIED IN THE DESIGN NOTES. REVIEWING ENGINEER SHALL VERIFY THAT THESE PARAMETERS MEET OR EXCEED PROJECT SPECIFIC REQUIREMENTS. IF SITE

CONDITIONS DIFFER FROM NOTED DESIGN PARAMETERS, REVIEWING

ENGINEER SHALL NOTIFY OLDCASTLE FOR POTENTIAL REDESIGN AND/OR PRICING ADJUSTMENTS.

2. REVIEWING ENGINEER SHALL VERIFY ALL PIPE PENETRATION LOCATIONS, SIZES, AND INVERTS.

3. REVIEWING ENGINEER SHALL VERIFY ALL MANWAY ACCESS LOCATIONS AND RIM ELEVATIONS.

4. THIS SYSTEM IS DESIGNED FOR A GROUNDWATER TABLE ELEVATION PER DESIGN NOTE 2C, SHEET 1. REVIEWING ENGINEER SHALL VERIFY THAT THE

DESIGN GROUNDWATER ELEVATION MEETS OR EXCEEDS SITE CONDITION REQUIREMENTS. NOTIFY OLDCASTLE IF SITE CONDITIONS VARY FROM WHAT

HAS BEEN SPECIFIED FOR POTENTIAL SYSTEM DESIGN CHANGES AND/OR PRICING ADJUSTMENTS.

COMPACTED FILL, SEE INSTALLATION GUIDE,
BY OTHERS.
030" HS -20 RATED FRAME & COVER.

DETAIL A
MODULE El
SCALE: 1/4" = 1'-0"
RIM: ±2599.09'
±3.10'
1 EL: 2595.99'.
(TOP OF SYSTEM)
2X 030"x12" GRADE RINGS.
1X 030"X6" GRADE RING.

5. STORMCAPTURE MODULES ARE NOT WATERTIGHT. IF A WATERTIGHT SOLUTION IS REQUIRED, CONTACT OLDCASTLE FOR RECOMMENDATIONS. THE

WATERTIGHT APPLICATION TO BE PROVIDED AND IMPLEMENTED BY THE CONTRACTOR. THE CONTRACTOR IS RESPONSIBLE TO ENSURE THAT THE

SELECTED WATERTIGHT SOLUTION PERFORMS AS SPECIFIED BY THE MANUFACTURER.

6. DESIGN OF THE STORMCAPTURE PRECAST MODULE SYSTEM ASSUMES NO

ADJACENT BUILDING(S), WALL(S), OR STRUCTURAL FOUNDATION(S) WITHIN A 1:1 INFLUENCE LINE FROM THE BOTTOM EDGE OF ANY SYSTEM MODULE. ANY

SITE ELEMENTS BEYOND THIS ZONE OF INFLUENCE ARE ASSUMED TO HAVE

NO IMPACT ON THE SYSTEM AND EXERT ZERO LATERAL SURCHARGE ONTO THE MODULES. THE CONTRACTOR SHALL VERIFY THAT ANY ADJACENT

BUILDING(S), WALL(S), OR STRUCTURAL FOUNDATION(S) DO NOT LIE WITHIN THIS INFLUENCE ZONE OR DO NOT SURCHARGE THE PRECAST MODULES.

7. WRITTEN APPROVAL OF SUBMITTAL DRAWINGS ALONG WITH SIGNED PURCHASE ORDER REQUIRED FOR BEGINNING OF PRODUCT FABRICATION.

ANY SYSTEM MODIFICATION POST -APPROVAL MAY RESULT IN CHANGE ORDER(S) AND/OR POTENTIAL DELIVERY DELAYS.

8. ALL SAND FILTER MEDIA, DRAIN ROCK AGGREGATE, PIPE, AND FITTINGS PROVIDED BY CONTRACTOR.

WATEPOOFI\G TO 3E PROVIDED 3Y OTHES.
030" HS -20 RATED FRAME & GRATE WITH
RISERS/GRADE RINGS AS REQUIRED TO GRADE.
01" VENT HOLE ONE SIDE ONLY.

SEE INSTALLATION GUIDE.

STORMCAPTURE MODULES BY OLDCASTLE PAVING/OVERBURDEN,
INFRASTRUCTURE. BY CONTRACTOR.

GEOTEXTILE FABRIC
TO EXTEND 1' MINIMUM
UP SIDES OF SYSTEM.

GEOTEXTILE FABRIC, CONTRACTOR TO ENSURE ADEQUATE BEARING SURFACE 04" TERMADUCT, TYPICAL.

PROVIDED IN ACCORDANCE WITH PROJECT SPECIFICATIONS.

TYPICAL ELEVATION
NTS
Detention/
Infiltration

MIN TO MAX ALLOWABLE
RIM RANGE:
2596.49'-2600.99'

0.50' MIN COVER

5.00' MAX COVER
EL: 2595.99'

6.25"
EL: 2595.47'
EL: 2591.47'
n EL: 2590.89'
NOTE:

TERMADUCT INSERTS TO BE KNOCKED OUT
AT SPECIFIED LOCATIONS ONLY (BY OTHERS).

UPDATED PER COMMENTS
2/10/25
REV

DESCRIPTION
DATE
Oldcastle Infrastructure

A WICOMANY
Ph: 800.579.8819 www.oldcastleinfrastructure.com/stormwater THIS DOCUMENT IS THE PROPERTY OF OLDCASTLE INFRASTRUCTURE, INC.

IT IS CONFIDENTIAL, SUBMITTED FOR REFERENCE PURPOSES ONLY AND

SHALL NOT BE USED IN ANY WAY INJURIOUS TO THE INTERESTS OF, OR WITHOUT THE WRITTEN PERMISSION OF OLDCASTLE INFRASTRUCTURE, INC.

STORMCAPTURE ®

DETENTION SYSTEM

SYSTEM ID
CUSTOMER:

BKF Engineers
JOB NAME: BEAUMONT LIBRARY ADDITION
AND RENOVATION - Beaumont, CA
JOB NUMBER:
24-1202202
DATE
1/10/24
MFG
070 -FO
DRAWN
PPS

ENGINEER
HMF

CHECKED
HMF

SALES ORDER
S302167-3
SHEET
2 OF 4

DRAWING NAME

SUBMITTAL DRAWING
P _
age
350 0- 2-75

INSTALLATION NOTES

KEYWAYS

SEATING
RUBBER
PROPERLY.

MUST BE FREE OF
AND SEALING PROPERLY.

SEALANT MATERIAL

DIRT, ROCKS,
REMOVE
WITH A "SIDE
AND WATER.

ALL PROTECTIVE
BY SIDE"

ROCKS AND DIRT

PAPER FROM

JOINT, AWAY FROM

PREVENT
RUBBER
CORNERS. CORNER

THE VAULT

SEALANT

SPLICING

SECTIONS FROM
MATERIAL. SPLICE

WILL NOT SEAL

TOP SLAB LIFTING
4 -WAY SLINGS
WITH MIN. 10' LEGS.
8T RING CLUTCH

BY MEADOW
BURKE

DETAIL BOTTOM
MODULE
4 -WAY
WITH

LIFTING
SLINGS
MIN.

S
10LEGS.
8T RING CLUTCH

BY MEADOW
BURKE
DETAIL

1. UNDERGROUND PRECAST CONCRETE SYSTEM INSTALLATION SHALL BE PER ASTM C891, "STANDARD PRACTICE FOR INSTALLATION OF UNDERGROUND PRECAST CONCRETE UTILITY STRUCTURES" AND PER OLDCASTLE.

2. MODULE SUBBASE OR SUBGRADE SHALL BE LEVEL/SCREEDED AND

COMPACTED ADEQUATELY FOR REQUIRED BEARING CAPACITY PER DESIGN NOTE 2D, SHEET 1. CONTRACTOR AND/OR INSTALLING SUB -CONTRACTOR

SHALL VERIFY THAT SOIL BEARING CONDITIONS MEET OR EXCEED DESIGN REQUIRED MINIMUMS PRIOR TO PLACEMENT AND INSTALLATION OF MODULES.

3. ANY CONSTRUCTION EQUIPMENT EXCEEDING NOTED DESIGN LOADING IS NOT

PERMITTED OVER OR ADJACENT TO ANY MODULE WITHOUT FORMAL REVIEW

AND WRITTEN APPROVAL BY OLDCASTLE ENGINEERING, ELSE PRODUCT WARRANTY MAY BE VOIDED. ANY DESIGN CONSTRAINT EXCEEDING THE

DESIGN PARAMETERS NOTED ABOVE MAY REQUIRE CUSTOM STRUCTURAL DESIGN, SUBGRADE REVISIONS, AND/OR PRICING ADJUSTMENTS.

4. HEAVY VIBRATORY COMPACTION EQUIPMENT SHALL NOT BE OPERATED WITHIN 10 FEET OF MODULE EXTERIOR.

5. MINIMUM OF 0.50FT OF SOIL COVER REQUIRED FOR CONSTRUCTION EQUIPMENT OPERATION ON TOP OF SYSTEM. IT IS THE RESPONSIBILITY OF

THE CONTRACTOR AND INSTALLING SUB -CONTRACTOR TO ENSURE THAT NO MODULES ARE DAMAGED DURING CONSTRUCTION.

6. UNLESS NOTED OTHERWISE, ALL PIPE SUPPLIED AND INSTALLED BY OTHERS.

7. CONTRACTOR MAY MODIFY AT RISK ANY OLDCASTLE PRODUCT(S) IN THE

FIELD OR AFTER DELIVERY WITHOUT FORMAL REVIEW AND WRITTEN APPROVAL BY OLDCASTLE ENGINEERING. THE CONTRACTOR SHALL BE

RESPONSIBLE FOR VERIFYING THAT ANY PRODUCT MODIFICATIONS DO NOT INVALIDATE THE PRODUCT WARRANTY.

8. MODULE PLACEMENT FIELD TOLERANCES SHALL NOT EXCEED 3/4" BETWEEN ADJACENT MODULES. IF MODULE GAP EXCEEDS 3/4", CONTRACTOR SHALL

MAKE NECESSARY ADJUSTMENTS AND RESET MODULE(S) TO BRING WITHIN NOTED TOLERANCES.

9. CONTRACTOR IS RESPONSIBLE FOR PRODUCTS ONCE DELIVERED TO THE SITE. OLDCASTLE IS NOT RESPONSIBLE FOR OFFLOADING PRODUCTS,

MAINTENANCE, AND INSTALLATION OF PRODUCTS ONCE THEY ARRIVE TO THE SITE.

10. CONTRACTOR SHALL INSTALL SYSTEM PER PROJECT WATERPROOFING AND SOILTIGHTNESS REQUIREMENTS. WATERPROOFING AND SOILTIGHTNESS

INSTALLATION IS NOT BY OLDCASTLE AND OLDCASTLE WILL PROVIDE NO GUARANTEE FOR THIS COMPONENT OF SYSTEM INSTALLATION.

CORRECT
RUBBER

MATERIAL
- INSTALL INCORRECT

SEALANT OVERLAP

AT THE OUTER SEALANT
- DO NOT NCORRECT

THE RUBBER RUBBER SEALANT
MATERIAL AT A CORNER.
- DO NOT SPLICE

MATERIAL AT

RUBBER SEALANT
N.T.S. N.T.S.

EDGE OF THE KEYWAY. SPLICE. SHOULD BE CONTINUOUS
RUBBER SEALANT AROUND CORNERS.

SHOULD BE CONTINUOUS
AROUND CORNERS.

HEAVIEST PICK
WEIGHT = 24,250 LBS
BUTYL RUBBER SEALANT (CONSEAL CS -102 OR EQUAL)

PLACEMENT DETAIL
NTS

MAXIMUM EQUIPMENT OPERATING WEIGHT (OW) BY TRACK WIDTH

TRACK WIDTH
12"
18"
24"
30"

MIN TRACK LENGTH
8'-0"
10'-0"
12'-0"
14'-0"

FILL DEPTH (FT)

OW (LBS)

0.5 35,000
45,000
52,500
54,500
1 35,000
45,000
56,000
60,500
2 35,000
45,000
56,000
64,000
3 76,000
78,500
83,500
88,000
4 94,000
100,000
106,000
113,000
5 100,000
116,000
132,000
14 9, 000
NOTES:

A. IF CONSTRUCTION EQUIPMENT EXCEEDS THE ABOVE OPERATING WEIGHT LIMITS REFER TO INSTALLATION NOTE 3.

B. FOR WHEELED CONSTRUCTION EQUIPMENT LIMITS REFER TO INSTALLATION NOTE 3.

C. MINIMUM AXLE SPACING FOR ALL TRACK WIDTHS IS 6'-0".
8" MIN. WIDE STRIP OF

SELF-ADHESIVE OVER ENTIRE JOINT
PROVIDE MIN. 1' OVERLAP WHEN
CONNECTING STRIPS. JOINT WRAP

SUPPLIED BY OLDCASTLE AND
Q

UPDATED

PER COMMENTS
2/10/25
INSTALLED BY OTHERS.

REV

DESCRIPTION
DATE
SEE INSTALLATION NOTES 8 & 10.

CO Oldcastle
Ph: 800.579.8819
Infrastructure-

ACMICOMANY
I www.oldcastleinfrastructure.comistormwater
— — — — — — — — — —

THIS DOCUMENT IS THE

IT IS CONFIDENTIAL, SUBMITTED

SHALL NOT BE USED IN

FOR REFERENCE PURPOSES ONLY AND

ANY WAY INJURIOUS TO THE INTERESTS OF, OR
PERMISSION OF OLDCASTLE INFRASTRUCTURE, INC.

STORMCAPTURE

DETENTION SYSTEM
®

SYSTEM ID
-
CUSTOMER:

BKF Engineers
7/ GAP MIN. (%4" MAX)
JOB NAME: BEAUMONT

AND RENOVATION

LIBRARY ADDITION
- Beaumont, CA
JOB NUMBER:
24-1202202
DATE
1/10/24
MFG
070 -FO
DRAWN
PPS

ENGINEER
HMF

CHECKED
HMF

SALES DRDER
S302167-3
.-BETWEEN STRUCTURES

MODULE JOINT DETAIL
Detention/
Infiltration on

DRAWING NAME

SUBMITTAL DRAWING
SHEET
3 OF 4
SCALE: 1/2" = 1'-0"
age o

L _
16'-0"
6"
15' 0"
8'-0" T 0"
C

TYPICAL PLAN VIEW
SCALE: 1/4" = 1'-0"
L _
r 1' 6"
4' 0"
J
`01" VENT HOLE
THIS SIDE ONLY.
4'-7"
L
•
04" TERMADUCT
TYPICAL.

DETAIL 1 - TYPICAL WALL ELEVATION
SCALE: 1/4" = 1'-0"
4' 0"
L
34'J
4'-7"
4' 0"
2' 6"
L_
J
4'-0"
DETAIL 2 - TYPICAL WALL ELEVATION
SCALE: 1/4" = 1'-0"
8'-0"
r
4'-0„
I
CJ
4'-0"
030" OPENING
1 DETAIL 5 - MODULE El
SCALE: 1/4" = 1'-0"
3'-8"
3' 9"
010" OPENING FOR
08" PVC OUTLET
11' 3"
DETAIL 6 - MODULE El
SCALE: 1/4" = 1'-0"
6%a"
7'
6%4"
DETAIL 7 - MODULE El
SCALE: 1/4" = 1'-0"
L
016"X29" OBROUND OPENING
FOR 012" PVC INLET
Detention/
Infiltration
Q UPDATED PER COMMENTS 2/10/25

REV DESCRIPTION DATE
a
Oldcastle Infrastructure

A WICOMANY
Ph: 800.579.8819 www.olticastleinfrastructure.com/stormwater THIS DOCUMENT IS THE PROPERTY OF OLDCASTLE INFRASTRUCTURE, INC.

IT IS CONFIDENTIAL, SUBMITTED FOR REFERENCE PURPOSES ONLY AND SHALL NOT BE USED IN ANY WAY INJURIOUS TO THE INTERESTS OF. OR WITHOUT THE WRITTEN PERMISSION OF OLDCASTLE INFRASTRUCTURE, INC.

STORMCAPTURE ®

DETENTION SYSTEM
CUSTOMER:

BKF Engineers
JOB NAME: BEAUMONT LIBRARY ADDITION JOB NUMBER:

AND RENOVATION - Beaumont, CA 24-1202202

DATE MFG DRAWN ENGINEER CHECKED SALES ORDER
1/10/24 070 -FO PPS HMF HMF S302167-3

DRAWING NAME SHEET

SYSTEM ID PLAN -N

SUBMITTAL DRAWING
4 OF 4
P _
age 352 of 2x75

Appendix 8: Source Control
Pollutant Sources1SourceControl Checklist

Page 353 of 2775 ends

Attachment 1

STORMWATER POLLUTANT SOURCES/SOURCE CONTROL CHECKLIST
How to use this worksheet (also see instructions in Section H of the 2018 SMR WQMP Template):

1. Review Column 1 and identify which of these potential sources of stormwater pollutants apply to your site. Check each box that applies.

2. Review Column 2 and incorporate all of the corresponding applicable BMPs in your WQMP Exhibit.

3. Review Columns 3 and 4 and incorporate all of the corresponding applicable permanent controls and operational BMPs in your WQMP. Use the format shown in Table H.1 of this WQMP Template. Describe your specific BMPs in an accompanying narrative, and explain any special conditions or situations that required omitting BMPs or substituting alternative BMPs for those shown here.

Provide stormwater pollution
prevention information to new site
owners, lessees, or operators.
0 See applicable operational BMPs in
Fact Sheet SC -44, "Drainage System
Maintenance," in the CASQA
Stormwater Quality Handbooks at
www.cabmphandbooks.com
yr Include the following in lease
agreements: "Tenant shall not allow
anyone to discharge anything to storm
drains or to store or deposit materials
so as to create a potential discharge to
storm drains."
❑ B. Interior floor drains
and elevator shaft sump
pumps
❑ State that interior floor drains and
elevator shaft sump pumps will be
plumbed to sanitary sewer.

U Inspect and maintain drains to prevent
blockages and overflow.
❑ C. Interior parking
garages
❑ State that parking garage floor
drains will be plumbed to the
sanitary sewer.
❑ Inspect and maintain drains to prevent
blockages and overflow.
2018 "Other Development Project" Water Quality Checklist Template

Page 354 of 2775 ends

Attachment 1— Page 1 of 10

Attachment 1

STORMWATER POLLUTANT SOURCES/SOURCE CONTROL CHECKLIST

State that final landscape plans will
accomplish all of the following.

Preserve existing native trees,
shrubs, and ground cover to the
maximum extent possible.
i Design landscaping to minimize
g p g
irrigation and runoff, to promote
surface infiltration where
appropriate, and to minimize the
use of fertilizers and pesticides that
can contribute to stormwater
pollution.

Aj Where landscaped areas are used to
retain or detain stormwater, specify
plants that are tolerant of saturated
soil conditions.

Z Consider using pest -resistant plants,
especially adjacent to hardscape. To
insure successful establishment,
select plants appropriate to site soils,
slopes, climate, sun, wind, rain, land
use, air movement, ecological
consistency, and plant interactions.
id Maintain landscaping using minimum
or no pesticides.
7 See applicable operational BMPs in
"What you should know
for.....Landscape and Gardening" at:
bout/
map://ww�brarv/#1450469138 95 -bb
materials-library/#1450469138395-bb76dd39-
d810
A Provide IPM information to new
owners, lessees and operators.

Page 355 of 2775 ends

2018 "Other Development Project" Water Quality Checklist Template Attachment 1— Page 2 of 10

Attachment 1

STORMWATER POLLUTANT SOURCES/SOURCE CONTROL CHECKLIST

IF THESE SOURCES WILL BE
ON THE PROJECT SITE ...
... THEN YOUR WQMP SHOULD INCLUDE THESE SOURCE CONTROL BMPs, AS APPLICABLE 1 Potential Sources of
Runoff Pollutants
2 Permanent Controls —Show on
WQMP Drawings
3 Permanent Controls —List in WQMP
Table and Narrative
4 Operational BMPs—Include in WQMP
Table and Narrative
❑ E. Pools, spas, ponds,
decorative fountains,
and other water
features.
❑ Show location of water feature and
a sanitary sewer cleanout in an
accessible area within 10 feet.
(Exception: Public pools must be
plumbed according to County
Department of Environmental
Health Guidelines.)
If the Co-Permittee requires pools
to be plumbed to the sanitary
sewer, place a note on the plans
and state in the narrative that this
connection will be made according
to local requirements.
❑ See applicable operational BMPs in
"Guidelines for Maintaining Your
Swimming Pool, Jacuzzi and
Garden Fountain" at: http://
www.rewatershed.org/about/materials-
library/#1450469201433-f5f358c9-6008
❑ F. Food service
❑ For restaurants, grocery stores, and
other food service operations, show
location (indoors or in a covered
area outdoors) of a floor sink or
other area for cleaning floor mats,
containers, and equipment.
❑ On the drawing, show a note that
this drain will be connected to a
grease interceptor before
discharging to the sanitary sewer.
❑ Describe the location and features
of the designated cleaning area.
❑ Describe the items to be cleaned in
this facility and how it has been
sized to insure that the largest
g
items can be accommodated.
❑ See the brochure, "The Food Service
Industry Best Management Practices
for: Restaurants, Grocery Stores,
Delicatessens and Bakeries" at h //
m"
www•rcwatershed.org/about/materiais-
library/#1450389926766-61e8af0b-53a9
Provide this brochure to new site
owners, lessees, and operators.

G. Refuse areas
Show where site refuse and
recycled materials will be handled
and stored for pickup. See local
municipal requirements for sizes
and other details of refuse areas.

YIf dumpsters or other receptacles
are outdoors, show how the
designated area will be covered,
graded, and paved to prevent run-
on and show locations of berms to
prevent runoff from the area.
❑ Any drains from dumpsters,
compactors, and tallow bin areas
shall be connected to a grease
removal device before discharge to
sanitary sewer.

I State how site refuse will be
handled and provide supporting
detail to what is shown on plans.
4 State that signs will be posted on or
near dumpsters with the words "Do
not dump hazardous materials
here" or similar.
le State how the following will be
implemented:

Provide adequate number of
receptacles. Inspect receptacles
regularly; repair or replace leaky
receptacles. Keep receptacles covered.

Prohibit/prevent dumping of liquid or
hazardous wastes. Post "no hazardous
materials" signs. Inspect and pick up
litter daily and clean up spills
immediately. Keep spill control
materials available on -site. See Fact
Sheet SC -34, "Waste Handling and
Disposal" in the CASQA Stormwater
Quality Handbooks at
www.cabmphandbooks.com

Page 356 of 2775 ends

2018 "Other Development Project" Water Quality Checklist Template Attachment 1— Page 3 of 10

Appendix 8

STORMWATER POLLUTANT SOURCES/SOURCE CONTROL CHECKLIST

No processes to drain to exterior or
to storm drain system."
❑ See Fact Sheet SC -10, "Non -
Stormwater Discharges" in the
CASQA Stormwater Quality
Handbooks at
www.cabmphandbooks.com
See the brochure "Industrial &
Commercial Facilities Best Management
Practices for: Industrial, Commercial
Facilities" at, http://www.rcwatershed.org/
about/materials-library/
#1450389926766-61e8af0b-53a9
❑ I. Outdoor storage of
equipment or materials.
(See rows J and K for
source control
measures for vehicle
cleaning, repair, and
maintenance.)
❑ Show any outdoor storage areas,
including how materials will be
covered. Show how areas will be
graded and bermed to prevent run-
on or run-off from area.
❑ Storage of non -hazardous liquids
shall be covered by a roof and/or
drain to the sanitary sewer system,
and be contained by berms, dikes,
liners, or vaults.
❑ Storage of hazardous materials and
wastes must be in compliance with
the local hazardous materials
ordinance and a Hazardous
Materials Management Plan for the
site.
❑ Include a detailed description of
materials to be stored, storage
areas, and structural features to
prevent pollutants from entering
storm drains.

Where appropriate, reference
documentation of compliance with
the requirements of Hazardous
Materials Programs for:
■ Hazardous Waste Generation
• Hazardous Materials Release
Response and Inventory
• California Accidental Release
(Ca1ARP)
■ Aboveground Storage Tank
• Uniform Fire Code Article 80
Section 103(b) & (c) 1991
• Underground Storage Tank
www.cchealth.org/groups /hazmat.L
❑ See the Fact Sheets SC -31, "Outdoor
Liquid Container Storage" and SC -33,
"Outdoor Storage of Raw Materials "
in the CASQA Stormwater Quality
Handbooks at
www.cabmphandbooks.com
•cabmphandbooks.com

Page 357 of 2775 ends

2018 "Other Development Project" Water Quality Checklist Template Attachment 1— Page 4 of 10

Attachment 1

STORMWATER POLLUTANT SOURCES/SOURCE CONTROL CHECKLIST

IF THESE SOURCES WILL BE
ON THE PROJECT SITE ...
... THEN YOUR WQMP SHOULD INCLUDE THESE SOURCE CONTROL BMPs, AS APPLICABLE 1 Potential Sources of
Runoff Pollutants
2 Permanent Controls —Show on
WQMP Drawings
3 Permanent Controls —List in WQMP
Table and Narrative
4 Operational BMPs—Include in WQMP
Table and Narrative
❑ J. Vehicle and
Equipment Cleaning
❑ Show on drawings as appropriate:
(1) Commercial/industrial facilities
having vehicle/equipment cleaning
needs shall either provide a
covered, bermed area for washing
activities or discourage
vehicle/equipment washing by
removing hose bibs and installing
signs prohibiting such uses.
(2) Multi -dwelling complexes shall
have a paved, bermed, and covered
car wash area (unless car washing
is prohibited on -site and hoses are
provided with an automatic shut-
off to discourage such use).
(3) Washing areas for cars, vehicles,
and equipment shall be paved,
designed to prevent run-on to or
runoff from the area, and plumbed
to drain to the sanitary sewer.
(4) Commercial car wash facilities
shall be designed such that no
runoff from the facility is
discharged to the storm drain
system. Wastewater from the
facility shall discharge to the
sanitary sewer, or a wastewater
reclamation system shall be
installed.
❑ If a car wash area is not provided,
describe any measures taken to
discourage on -site car washing and
explain how these will be enforced.

Describe operational measures to
implement the following (if
applicable):
❑ Washwater from vehicle and
equipment washing operations shall
not be discharged to the storm drain
system. Refer to "Outdoor Cleaning
Activities and Professional Mobile
Service Providers" for many of the
Potential Sources of Runoff Pollutants
categories below. Brochure can be
found at: http://www.rcwatershed.org/
about/materials-library/
#1450389926766-61e8af0b-53a9
❑ Car dealerships and similar may
rinse cars with water only.

Page 358 of 2775 ends

2018 "Other Development Project" Water Quality Checklist Template Attachment 1— Page 5 of 10

Attachment 1

STORMWATER POLLUTANT SOURCES/SOURCE CONTROL CHECKLIST

IF THESE SOURCES WILL BE
ON THE PROJECT SITE ...
... THEN YOUR WQMP SHOULD INCLUDE THESE SOURCE CONTROL BMPs, AS APPLICABLE 1 2
3 4
Potential Sources of
Permanent Controls —Show on
Permanent Controls —List in WQMP
Operational BMPs—Include in WQMP
Runoff Pollutants
WQMP Drawings
Table and Narrative
Table and Narrative
❑ K. Vehicle/Equipment
❑ Accommodate all vehicle
❑ State that no vehicle repair or
In the Stormwater Control Plan, note
Repair and
equipment repair and maintenance
maintenance will be done outdoors,
that all of the following restrictions
Maintenance
indoors. Or designate an outdoor
or else describe the required
apply to use the site:
work area and design the area to
features of the outdoor work area.
❑ No person shall dispose of, nor permit
prevent run-on and runoff of
❑ State that there are no floor drains
the disposal, directly or indirectly of
stormwater.
or if there are floor drains, note the
vehicle fluids, hazardous materials, or
❑ Show secondary containment for
agency from which an industrial
rinsewater from parts cleaning into
exterior work areas where motor
waste discharge permit will be
storm drains.
oil, brake fluid, gasoline, diesel
obtained and that the design meets
❑ No vehicle fluid removal shall be
fuel, radiator fluid, acid -containing
that agency's requirements.
performed outside a building, nor on
batteries or other hazardous
materials or hazardous wastes are
❑ State that there are no tanks,
containers or sinks to be used for
asphalt or ground surfaces, whether
inside or outside a building, except in
used or stored. Drains shall not be
parts cleaning or rinsing or, if there
such a manner as to ensure that any
installed within the secondary
are, note the agency from which an
spilled fluid will be in an area of
containment areas.
industrial waste discharge permit
secondary containment. Leaking
❑ Add a note on the plans that states
will be obtained and that the
vehicle fluids shall be contained or
either (1) there are no floor drains,
or (2) floor drains are connected to
wastewater pretreatment systems
prior to discharge to the sanitary
sewer and an industrial waste
discharge permit will be obtained.
design meets that agency's
requirements.
drained from the vehicle immediately.
❑ No person shall leave unattended drip
parts or other open containers
containing vehicle fluid, unless such
containers are in use or in an area of
secondary containment.

Refer to "Automotive Maintenance &
Car Care Best Management Practices
for Auto Body Shops, Auto Repair
Shops, Car Dealerships, Gas Stations
and Fleet Service Operations;
"Outdoor Cleaning Activities;" and
"Professional Mobile Service
Providers" for many of the Potential
Sources of Runoff Pollutants.

Brochures can be found at: http://
www.rcwatershed.org/about/materials-
library/ # 1450389926766-61 e8af0b-53a9
2018 "Other Development Project" Water Quality Checklist Template Attachment 1— Page 6 of 10

Attachment 1

STORMWATER POLLUTANT SOURCES/SOURCE CONTROL CHECKLIST

Page 360 of 2775 ends

2018 "Other Development Project" Water Quality Checklist Template Attachment 1— Page 7 of 10

Attachment 1

STORMWATER POLLUTANT SOURCES/SOURCE CONTROL CHECKLIST

D Provide a roof overhang over the
loading area or install door skirts
(cowling) at each bay that enclose
the end of the trailer.

Page 361 of 2775 ends

2018 "Other Development Project" Water Quality Checklist Template Attachment 1— Page 8 of 10

Attachment 1

STORMWATER POLLUTANT SOURCES/SOURCE CONTROL CHECKLIST

D Condensate drain lines may
discharge to landscaped areas if the
flow is small enough that runoff will
not occur. Condensate drain lines
may not discharge to the storm
drain system.
❑ Rooftop equipment with potential
to produce pollutants shall be
roofed and/or have secondary
containment.
❑ Any drainage sumps on -site shall
feature a sediment sump to reduce
the quantity of sediment in pumped
water.
❑ Avoid roofing, gutters, and trim
made of copper or other
unprotected metals that may
leach into runoff.
❑ Include controls for other sources
as specified by local reviewer.

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2018 "Other Development Project" Water Quality Checklist Template Attachment 1— Page 9 of 10

Attachment 1

STORMWATER POLLUTANT SOURCES/SOURCE CONTROL CHECKLIST

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2018 "Other Development Project" Water Quality Checklist Template Attachment 1— Page 10 of 10

Appendix 9: O&M
Operation and Maintenance Ran and Documentation of Rnance, Maintenance and Recording Mechanisms

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WQMP
Operation & Maintenance (O&M) Plan
Project Name:

Beaumont Library Addition and Renovation Project
Prepared for:

Beaumont Library District
125 East 8th Street
Beaumont, CA 92223
(951) 845-1357
Prepared on:

November 2024

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TABLE OF CONTENTS

8.1.1 Project Information 3

8.1.2 Responsible Party 4

8.1.3 Record Keeping 4

8.1.4 Electronic Date Submittal 4

8.1.5 Vector Control 4

8.1.6 Required Permits 4

8.1.7 Inspections 4

8.1.8 Monitoring Plan 5

8.1.9 Operation and Maintenance Requirements 5

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This O&M Plan describes the designated responsible party for implementation of this WQMP, including: operation and maintenance of all the structural BMP(s), conducting the training/educational program and duties, and any other necessary activities. The O&M Plan includes detailed inspection and maintenance requirements for all structural BMPs, including copies of any maintenance contract agreements, manufacturer's maintenance requirements, permits, etc.

8.1.1 Project Information
APN: 418-081-016, 418-081002, 418-081-003, 418-081-004
Address: 125 East 8th Street, Beaumont, CA 92223
Site Size: 1.23 Acres
List Structural BMPs, number of each, etc.:
- 1 Modular Wetland System Unit
How many buildings:
- 1 building
% impervious of site: 90%
There are 2 drainage areas and 1 BMP. 1 drainage area is considered self -treating.

Flows are conveyed through the parking lot and proposed storm drain system.

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8.1.2 Responsible Party
The responsible party for implementation of this WQMP is:

Beaumont Library District.

8.1.3 Record Keeping
Parties responsible for the O&M plan shall retain records for at least 5 years.

All training and educational activities and BMP operation and maintenance shall be documented to verify compliance with this O&M Plan. A sample Training Log and Inspection and Maintenance Log are included in Appendix C of this document.

The WQMP Verification Form (Appendix D) shall be completed accurately and submitted, with associated documentation, to the City of Moreno Valley as requested. Failure to complete and submit the verification form will result in a noncompliance and enforcement actions may be taken.

8.1.4 Electronic Data Submittal
This document along with the Site Plan and Attachments shall be provided in PDF format. Autocad files and/or GIS coordinates of BMPs shall also be submitted to the City.

8.1.5 Vector Control
Standing water which exists for longer than 72 hours may contribute to mosquito breeding areas. Best Management Practices (BMPs) shall be inspected for standing water on a regular basis. Standing water may indicate that the BMP is not functioning properly and proper action to remedy the situation shall be taken in a timely manner.

Elimination of standing water and managing garbage, lawn clippings, and pet droppings, can help decrease the presence of mosquitoes and flies in the area.

8.1.6 Required Permits
No permits are required for the implementation, operation, and maintenance of the BMPs.

8.1.7 Inspections
Routine inspection and required maintenance of all BMPs and the site should begin immediately upon completion of construction and continue throughout the life of the project. The City may conduct a site inspection to evaluate compliance with the Project WQMP, at any time.

8.1.8 Monitoring Plan
No monitoring is required.

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8.1.9 Operation and Maintenance Requirements
BMP
Inspection/Maintenance Activities
Minimum Frequency
On -site Storm
Drain Inlets
The painted message shall be inspected annually
& repainted as necessary.

Annually.

Catch basin inlets, area drains, curb -and -gutter
systems and other drainage systems shall be
inspected after each storm event and, if
necessary, cleaned prior to the storm season by
October 1st each year.

Annually
Indoor Pest
Control
Weekly. Maintain landscaping
using minimum or no pesticides.

Ongoing. Provide IPM
information to new owners, leesees and
operators.

Weekly, Ongoing
Landscape Pest
Control &
Fertilizers
Weekly. Maintain landscaping
using minimum or no pesticides.

Ongoing. Provide IPM
information to new owners, leesees and
operators.

Weekly, Ongoing
Plazas,
sidewalks, and
parking lots
Sweep plazas, sidewalks, and
parking lots regularly to prevent accumulation of
litter and debris.

Regularly
For treatment control maintenance of the modular wetland system, adhere to the Maintenance Guidelines for Modular Wetland System — Linear.

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BMP OPERATION & MAINTENANCE LOG

BEAUMONT LIBRARY
Today's Date:

Name of Person Performing Activity
(Printed):

Signature:

BMP Name
As Shown in O&M Plan)
Brief Description of Implementation, Maintenance, and
Inspection Activity Performed

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TRAINING / EDUCATIONAL LOG
Date of Training/Educational Activity:

Name of Person Performing Activity
(Printed):

Signature:

Topic of Training/Educational Activity:

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AND MAIL TO:

CITY CLERK
Recorded by Request of:

SPACE ABOVE FOR RECORDER'S USE ONLY

STORMWATER FACILITIES MAINTENANCE AGREEMENT
Assessor's Parcel No.: Location:

This AGREEMENT for the maintenance and repair of certain Stormwater Management Facilities is entered into between (hereinafter referred to as "OWNER") and the City of Beaumont (hereinafter referred to as "CITY") for the benefit of the CITY, the OWNER, the successors in interest to the CITY or the OWNER, and the public generally.

RECITALS
A. OWNER is the owner of certain real property located in the City of Beaumont, California, more particularly described in Exhibit "A" hereto (hereinafter referred to as the "PROPERTY").

B. In accordance with the City of Beaumont's Urban Runoff Regulations, Beaumont Municipal Code, Chapter 13.24, STORMWATER/URBAN RUNOFF MANAGEMENT AND DISCHARGE CONTROLS TITLE 13 (the "Stormwater Ordinance"), the City of Beaumont Subdivision Ordinance, the City of Beaumont Zoning Ordinance, The City of Beaumont Grading Ordinance and/or other ordinances or regulations of CITY which regulate land development and urban runoff, OWNER has prepared and submitted to CITY, a Water Quality Management Plan (hereinafter the WQMP), which is on file with CITY's Engineering Department. The WQMP proposes that stormwater runoff from the PROPERTY be managed by the use of the Stormwater Management Facilities which are identified in the WQMP as "Best Management Practices" or "BMPs". The WQMP specifies the manner and standards by which the BMPs must be repaired and maintained in order to retain their effectiveness, as set forth in the Operation Maintenance Plan (hereinafter "O&M PLAN"), as set forth in section 8.1.9 of the O & M Report dated November 2024, prepared by BKF Engineers.

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C. The information contained in the WQMP and CITY has relied upon OWNER's representations that the BMPs will be maintained pursuant to the WQMP, in approving OWNER's development applications. It is the purpose of this Agreement to assure that the BMPs are maintained, by creating obligations, which are enforceable against the OWNER and the OWNER's successors in interest in the PROPERTY. It is intended that these obligations be enforceable notwithstanding other provisions related to BMP maintenance, which are provided by law.

AGREEMENT
NOW, THEREFORE, for consideration of (a) CITY's approval of the above development applications and (b) the mutual covenants set forth herein, IT IS HEREBY AGREED AS FOLLOWS:

1. Maintenance of Stormwater Management Facilities. OWNER agrees, for itself and its successors in interest, to all or any portion of the PROPERTY, to comply in all respects with the requirements of the Stormwater Ordinance and the WQMP with regards to the maintenance of BMPs designated in the WQMP, and in particular agrees to perform, at its sole cost, expense and liability, the following "MAINTENANCE ACTIVITIES": all inspections, cleaning, repairs, servicing, maintenance and other actions specified in the O&M PLAN, with respect to all of the BMPs listed at Recital "B" above, at the times and in the manner specified in the O&M PLAN. OWNER shall initiate, perform and complete all MAINTENANCE ACTIVITIES at the required time, without request or demand from CITY or any other agency. OWNER shall provide annual written verification of BMP maintenance and operability to the CITY. OWNER further agrees that "MAINTENANCE ACTIVITIES" shall include replacement or modification of the BMPs in the event of failure. Replacement shall be with an identical type, size and model of BMP, except that:
(a) The CITY Engineer may authorize substitution of an alternative BMP if he or she determines that it will function as well as the failed BMP; and (b) Pursuant to Section 13.24 of the Stormwater Ordinance, if the failure of the BMP, in the judgment of the CITY Engineer indicates that the BMP in use is inappropriate or inadequate to the circumstances, the BMP must be modified or replaced with an upgraded BMP to prevent future failure in the same or similar circumstances.

2. Notices. OWNER further agrees that it shall, prior to transferring ownership of any land on which any of the above BMPs are located, and also prior to transferring ownership of any such BMP, provide clear written notice of the above maintenance obligations associated with that BMP to the transferee. OWNER further agrees to provide evidence to CITY Engineer that OWNER has requested the California Depai Intent of Real Estate to include in the public report issued for the development of the PROPERTY, a notification regarding the BMP maintenance requirements described herein.

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3. CITY's Right to Perform Maintenance. It is agreed that CITY shall have the right, but not the obligation, to elect to perform any or all of the MAINTENANCE ACTIVITIES if, in the CITY's sole judgment, OWNER has failed to perform the same. It is recognized and understood that the CITY makes no representation that it intends to or will perform any of the MAINTENANCE ACTIVITIES, and any election by CITY to perform any of the MAINTENANCE ACTIVITIES, shall in no way relieve OWNER of its continuing maintenance obligations under this agreement. If CITY elects to perform any of the MAINTENANCE ACTIVITIES, it is understood that CITY shall be deemed to be acting as the agent of the OWNER and said work shall be without warranty or representation by CITY as to safety or effectiveness, shall be deemed to be accepted by OWNER "as is", and shall be covered by OWNER's indemnity provisions below.

If CITY performs any of the MAINTENANCE ACTIVITIES, after CITY has demanded that OWNER perform the same and OWNER has failed to do so within a reasonable time stated in the CITY's demand, then OWNER shall pay all of CITY's costs incurred in performing the MAINTENANCE ACTIVITIES. OWNER's obligation to pay CITY's costs of performing MAINTENANCE ACTIVITIES is a continuing obligation and shall apply whether or not CITY has utilized all or any portion of the security provided pursuant to Paragraph 5.

4. Grant of Easement to CITY. OWNER hereby grants to CITY a perpetual easement over, under and across all of the PROPERTY for purposes of accessing the BMPs and performing any of the MAINTENANCE ACTIVITIES specified in Paragraph 1 above. CITY shall have the right, at any time and without prior notice to OWNER, to enter upon any part of said area as may be necessary or convenient for such purposes. OWNER shall at all times maintain the PROPERTY so as to make CITY's access clear and unobstructed.

5. Security. OWNER shall provide security to assure faithful performance of the obligations of this agreement. The security shall be in the form of an easement as referenced in Section 4, above.

CITY shall have the right to enforce its rights under the agreement through specific performance and any other remedies available to it in law. In the event that OWNER violates this agreement, CITY retains the sole right to require the posting of a performance bond or letter of credit to ensure compliance with the provisions of this agreement. The form of bond and/or letter of credit shall be subject to the approval of the City Attorney.

6. Administration of Agreement for CITY. CITY hereby designates its Engineer as the officer charged with responsibility and authority to administer this Agreement on behalf of CITY. Any notice or communication related to the implementation of this Agreement desired or required to be delivered to CITY shall be addressed to:

City Engineer
City of Beaumont
550 E. 6t' Street
Beaumont, CA 92223

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The City Engineer is also granted authority to enter into appropriate amendments to this Agreement on behalf of CITY, provided that the amendment is consistent with the purposes of this Agreement as set forth above.

7. Defense and Indemnity. CITY shall not be liable for, and OWNER and its successors in interest shall defend and indemnify CITY and the employees and agents of CITY (collectively "CITY PARTIES"), against any and all claims, demands, liability, judgments, awards, fines, mechanic's liens or other liens, labor disputes, losses, damages, expenses, charges or costs of any kind or character, including attorneys' fees and court costs (hereinafter collectively referred to as "CLAIMS"), related to this Agreement and arising either directly or indirectly from any act, error, omission or negligence of OWNER, OWNER's successors, or their contractors, licensees, agents, servants or employees, including, without limitation, claims caused by the concurrent negligent act, error or omission, whether active or passive of CITY PARTIES. OWNER shall have no obligation, however, to defend or indemnify CITY PARTIES from a claim if it is determined by a court of competent jurisdiction that such claim was caused by the sole negligence or willful misconduct of CITY PARTIES. Nothing is this Agreement, CITY's approval of the subdivision or other applications or plans and specifications, or inspection of the work, is intended to acknowledge responsibility for any such matter, and CITY PARTIES shall have absolutely no responsibility or liability therefore unless otherwise provided by applicable law.

8. Common Interest Developments. If the PROPERTY is developed as a "Common Interest Development" as defined in Civil Code section 4100 which will include membership in or ownership of an "ASSOCIATION" as defined in Civil Code section 4080 then the following provisions of this Paragraph 8 shall apply during such time as the PROPERTY is encumbered by a "DECLARATION" as defined in Civil Code section 4135, and the Common Area, as "Common Area" is defined in Civil Code section 4095, of the PROPERTY is managed and controlled by the ASSOCIATION:
(a) The ASSOCIATION, through its Board of Directors, shall assume full responsibility to perform the MAINTENANCE ACTIVITIES pursuant to this Agreement, and shall undertake all actions and efforts necessary to accomplish the MAINTENANCE ACTIVITIES, including but not limited to, levying regular or special assessments against each member of the ASSOCIATION sufficient to provide funding for the MAINTENANCE ACTIVITIES, conducting a vote of the membership related to such assessments if required by law. In the event insufficient votes have been obtained to authorize an assessment, the ASSOCIATION shall seek authority from a court of competent jurisdiction for a reduced percentage of affirmative votes necessary to authorize the assessment, re -conducting the vote of the membership in order to obtain the votes necessary to authorize an assessment, and the ASSOCIATION shall take all action authorized by the DECLARATION or California law to collect delinquent assessments, including but not limited to, the recording and foreclosure of assessment liens. (b) No provision of the DECLARATION, nor any other governing document of the ASSOCIATION or grant of authority to its members, shall grant or recognize a right of any member or other person to alter, improve, maintain or repair any of the PROPERTY in any

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manner which would impair the functioning of the BMPs to manage drainage or stormwater runoff as described in the WQMP. In the event of any conflict between the terms of this Agreement and the DECLARATION or other ASSOCIATION governing documents, the provisions of this Agreement shall prevail.

9. Agreement Binds Successors and Runs with the PROPERTY. It is understood and agreed that the terms, covenants and conditions herein contained shall constitute covenants running with the land and shall be binding upon the heirs, executors, administrators, successors and assigns of OWNER and CITY, shall be deemed to be for the benefit of all persons owning any interest in the PROPERTY (including the interest of CITY or its successors in the easement granted herein). It is the intent of the parties hereto that this Agreement may be recorded and shall be binding upon all persons purchasing or otherwise acquiring all or any lot, unit or other portion of the PROPERTY, who shall be deemed to have consented to and become bound by all the provisions hereof.

10. Amendment and Release. The terms of this Agreement may be modified only by a written amendment approved and signed by the City Council or the CITY Engineer acting on behalf of CITY and by OWNER or OWNER's successor(s) in interest. This Agreement may be terminated and OWNER and the PROPERTY released from the covenants set forth herein, by a Release, which CITY may execute if it determines that another mechanism will assure the ongoing maintenance of the BMPs or that it is no longer necessary to assure such maintenance.

11. Governing Law and Severability. This Agreement shall be governed by the laws of the State of California. Venue in any action related to this Agreement shall be in the Superior Court of the State of California, County of Riverside. In the event that any of the provisions of this Agreement are held to be unenforceable or invalid by any court of competent jurisdiction, the validity, and enforceability of the remaining provisions shall not be affected thereby.

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IN WITNESS WHEREOF, the parties have executed this Agreement on the day of 20 BY:

A Notary Public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document.

ALL SIGNATURES MUST BE NOTARIZED

STATE OF

COUNTY OF
}
}
On before me,
name and title of officer
Personally appeared who
proved to me on the basis of satisfactory evidence to be the person(s) whose name(s) is/are subscribed to the within instrument and acknowledged to me that he/she/they executed the same in his/her/their authorized capacity(ies), and that by his/her/their signature(s) on the instrument the person(s) or the entity upon behalf of which the person(s) acted, executed the instrument.

I certify under the PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature (Seal)
CITY OF BEAUMONT:

City Manager
CITY CLERK CERTIFICATION:

This is to certify that the interest in real property conveyed by deed or grant to the City of Beaumont, a political corporation and/or governmental agency is hereby accepted by the undersigned officer or agent on behalf of the City Council pursuant to authority conferred by Resolution No. adopted on and the grantee consents to recordation thereof by its duly authorized officer.

Dated: By:

City Clerk

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Appendix 10: Educational Materials
BM P Fact Sleets, Maintenance Gjidelinesand Other End -User BMP Information

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A 0RI
oft
C=::NTECH`

ENGINEERED SOLUTIONS
Modular Wetlands° Linear Operatons &
Maintenance Manual

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: iiRoopi;!iiIi
gl >ii*'MiindI�
11,k2 1_ . ,,I, ., 4
Cii10, , l!r ,,1!Ir"1llri ,lid rA

WETLANDS
-'4

MODULAR WETLANDS LINEAR

OPERATION & MAINTENANCE MANUAL

TABLE OF CONTENTS
Overview 3
Safety Notice & Personal Safety Equipment 4
Modular Wetlands Linear Components List 5
Inspection Summary & Equipment List 6
Inspection & Maintenance Notes 7
Inspection Process 7
Maintenance Indicators 9
Maintenance Summary & Equipment List 9
Maintenance Instructions 11
Replacing Biofiltration Media if Required 14
Replacing Drain Down Filter Media (Only on Older California Models) 16 Notes 17
Inspection Report 18
Cleaning & Maintenance Report 19
2

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OVERVIEW
This operation and maintenance (O&M) manual is for the Modular Wetlands Linear Biofilter (MWL). Please read the instructions and equipment lists closely prior to starting. It is important to follow all necessary safety procedures associated with state and local regulations. Please contact Contech for more information on pre -authorized third -party service providers who can provide inspection and maintenance services in your area. For a list of service providers in your area, please visit www.conteches.com/maintenance . , IIII I,il 1®10
A

WARNING
Confined space entry may be required. Contractor to obtain all equipment and training to meet applicable local and OSHA regulations regarding confined space entry. It is the Contractor's or entry personnel's responsibility to always proceed safely.

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3 SAFETY NOTICE & PERSONAL SAFETY EQUIPMENT
Maintenance and Protection
of Traffic Plan
Job site safety is a topic and a practice addressed comprehensively by others. The inclusions here are merely reminders to whole areas of Safety Practice that are the responsibility of the Owner(s), Manager(s), and Service Provider(s). OSHA and Canadian OSH, Federal, State/Provincial, and Local Jurisdiction Safety Standards apply on any given site or project.

The knowledge and applicability of those responsibilities is the Service Provider's responsibility and outside the scope of Contech Engineered Solutions.

Safety Boots
Gloves
Hard Hat
Eye Protection
4

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MODULAR WETLANDS LINEAR COMPONENTS LIST
The MWL system comes in multiple sizes and configurations, including side by side or end to end layouts, both as open planters or underground systems. See shop drawings (plans) for project specific details.

The standard MWL system is comprised of the following components:

Vertical Perforated Underdrain
Native Vegetation
Biofiltration Chamber
Pretreatment
Chamber
Inlet Pipe
N
Concrete
Structure
Pre -filter
Cartridge
Discharge
Chamber Control Riser
Biofiltration Media
Media
Containment
Cage
Outlet Pipe

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INSPECTION SUMMARY & EQUIPMENT LIST
Stormwater regulations require BMPs be inspected and maintained to ensure they are operating as designed to allow for effective pollutant removal and provide protection to receiving water bodies. It is recommended that inspections be performed multiple times during the first year to assess the site -specific loading conditions. The first year of inspections can be used to set inspection and maintenance intervals for subsequent years to ensure appropriate maintenance is provided.
• Inspect pre-treatment, biofiltration, and discharge chambers an average of once every six to twelve months. Varies based on site specific and local conditions. • Average inspection time is approximately 15 minutes. Always ensure appropriate safety protocol and procedures are followed.

The following is a list of equipment required to allow for simple and effective inspection of the MWL:

Modular Wetlands Linear
Inspection Form
Ratchet
& 7/16" Socket
(if required for older pre -filter
cartridges that have two
bolts holding the lids on)
log/
Flashlight
Tape Measure Access Cover Hook

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6 INSPECTION & MAINTENANCE NOTES

1. Following maintenance and/or inspection, it is recommended that the maintenance operator prepare a maintenance/inspection record. The record should include any maintenance activities performed, amount and description of debris collected, and condition of the system and its various filter mechanisms.

2. The owner should keep maintenance/inspection record(s) for a minimum of five years from the date of maintenance. These records should be made available to the governing municipality for inspection upon request at any time.

3. Transport all debris, trash, organics, and sediments to approved facility for disposal in accordance with local and state requirements.

4. Entry into chambers may require confined space training based on state and local regulations.

5. No fertilizer shall be used in the biofiltration chamber.

6. Irrigation should be provided as recommended by manufacturer and/or landscape architect. Amount of irrigation required is dependent on plant species. Some plants may not require irrigation after initial establishment.

INSPECTION PROCESS

1. Prepare the inspection form by writing in the necessary information including project name, location, date & time, unit number and other information (see inspection form).

2. Observe the inside of the system through the access covers. If minimal light is available and vision into the unit is impaired, utilize a flashlight to see inside the system and all chambers.

3. Look for any out of the ordinary obstructions in the inflow pipe, pre-treatment chamber, biofiltration chamber, discharge chamber or outflow pipe. Write down any observations on the inspection form.

4. Through observation and/or digital photographs, estimate the amount of trash, debris accumulated in the pre- treatment chamber. Utilizing a tape measure or measuring stick, estimate the amount of sediment in this chamber. Record this depth on the inspection form.

5. Through visual observation, inspect the condition of the pre -filter cartridges. Look for excessive build-up of sediment on the cartridges, any build-up on the tops of the cartridges, or clogging of the holes. Record this information on the inspection form. The pre -filter cartridges can be further inspected by removing the cartridge tops and assessing the color of the BioMediaGREEN filter cubes (requires entry into pre-treatment chamber - see notes previous notes regarding confined space entry). Record the color of the material. New material is a light green color. As the media becomes clogged, it will turn darker in color, eventually becoming dark brown or black. The closer to black the media is the higher percentage that the media is exhausted and in need of replacement.
7

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New
BioMediaGREEN
0%
Exhausted
BioMediaGREEN
10 6. The biofiltration chamber is generally maintenance -free due to the system's advanced pre-treatment chamber.

For units which have open planters with vegetation, it is recommended that the vegetation be inspected. Look for any plants that are dead or showing signs of disease or other negative stressors. Record the general health of the plants on the inspection form and indicate through visual observation or digital photographs if trimming of the vegetation is required.

7. The discharge chamber houses the control riser (if applicable), drain down filter (only in California - older models), and is connected to the outflow pipe. It is important to check to ensure the orifice is in proper operating condition and free of any obstructions. It is also important to assess the condition of the drain down filter media which utilizes a block form of the BioMediaGREEN. Assess in the same manner as the cubes in the pre -filter cartridge as mentioned above.

8. Finalize the inspection report for analysis by the maintenance manager to determine if maintenance is required. 8

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MAINTENANCE INDICATORS
Based upon the observations made during inspection, maintenance of the system may be required based on the following indicators:
• Missing or damaged internal components or cartridges. • Obstructions in the system or its inlet and/or outlet pipes. • Excessive accumulation of floatables in the pre-treatment chamber in which the length and width of the chamber is fully impacted more than 18".
• Excessive accumulation of sediment in the pre-treatment chamber of more than 6" in depth. • Excessive accumulation of sediment on the BioMediaGREEN media housed within the pretreatment cartridges.

When media is more than 85% clogged, replacement is required. The darker the BioMediaGREEN, the more clogged it is and in need of replacement.
• Excessive accumulation of sediment on the BioMediaGREEN media housed within the drain down filter (California only - older models).
• Overgrown vegetation.

MAINTENANCE SUMMARY & EQUIPMENT LIST
The time has come to maintain your MWL. All necessary pre -maintenance steps must be carried out before maintenance occurs. Once traffic control has been set up per local and state regulations and access covers have been safely opened, the maintenance process can begin. It should be noted that some maintenance activities require confined space entry.

All confined space requirements must be strictly followed before entry into the system. In addition, the following is recommended:
• Prepare the maintenance form by writing in the necessary information including project name, location, date & time, unit number and other info (see maintenance form). • Set up all appropriate safety and maintenance equipment. • Ensure traffic control is set up and properly positioned. • Prepared pre -checks (OSHA, safety, confined space entry) are performed. o A gas meter should be used to detect the presence of any hazardous gases prior to entering the system.

If hazardous gases are present, do not enter the vault. Following appropriate confined space procedures, take steps such as utilizing a venting system to address the hazard. Once it is determined to be safe, enter the system utilizing appropriate entry equipment such as a ladder and tripod with harness.
9

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The following is a list of equipment required for maintenance of the MWL:

Modular Wetlands Linear
Maintenance Form
Vacuum Assisted Truck with
Pressure Washer
Flashlight Access Cover Hook
, d 4,
Replacement
BioMediaGREEN
(If Required)
Ratchet
& 7/16" Socket
(if required for older pre -filter
cartridges that have two
bolts holding the lids on)
(order BioMediaGREEN from Contech's Maintenance Team members at https://www.conteches.com/maintenance) 10

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MAINTENANCE INSTRUCTIONS

1. ACCESS COVER REMOVAL
Upon determining that the vault is safe for entry, remove all access cover(s) and position the vacuum truck
accordingly.

2. PRESSURE WASH SYSTEM CHAMBERS
With the pressure washer, spray down pollutants
accumulated on the walls and floors of the pre-
treatment and discharge chambers. Then wash any
accumulated sediment from the pre -filter cartridge(s).

3. VACUUM SYSTEM CHAMBERS
Vacuum out pre-treatment and discharge chambers and
remove all accumulated pollutants including trash,
debris, and sediments. Be sure to vacuum the pre-
treatment floor until the pervious pavers are visible and clean. (MWL systems outside of California may or may
not have pervious pavers on the floor in the pre-
treatment chamber) If pre -filter cartridges require
media replacement, proceed to Step 4. If not, replace the access cover(s) and proceed to Step 7.
11

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4. PRE -FILTER CARTRIDGE LID REMOVAL
After successfully cleaning out the pre-treatment
chamber, enter the chamber and remove the lid(s) from
the pre -filter cartridge(s) by removing the two thumb
screws. (Older pre -filter cartridges have two bolts
holding the lids on that require a 7/16" socket to remove)

5. VACUUM EXISTING PRE -FILTER MEDIA
Utilize the vacuum truck hose or hose extension to
remove the filter media from each of the individual
media cages. Once filter media has been sucked out, use a pressure washer to spray down the inside of the
cartridge and its media cages. Remove cleaned media
cages and place to the side. Once removed, the vacuum
hose can be inserted into the cartridge to vacuum out
any remaining material near the bottom of the cartridge.

6. PRE -FILTER MEDIA REPLACEMENT
Reinstall media cages and fill with new media from the
manufacturer or outside supplier. Manufacturer will
provide specification of media and sources to purchase.

The easiest way to fill the media cages is to utilize a refilling tray that can also be sourced from the
manufacturer. Place the refilling tray on top of the
cartridge and fill with new bulk media shaking it down
into the cages. Using your hands, lightly compact the
media into each filter cage. Once the cages are full (each cartridge will hold five heaping 5gal buckets of bulk
media), remove the refilling tray and replace the
cartridge top, ensuring fasteners are properly tightened. 12

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7. MAINTAINING VEGETATION
In general, the biofiltration chamber is maintenance -free with the exception of maintaining the vegetation. The
MWL utilizes vegetation similar to surrounding
landscape areas, therefore, trim vegetation to match
surrounding vegetation. If any plants have died, replace them with new ones.

8. INSPECT UNDERDRAIN SYSTEM
Each vertical under drain on the biofiltration chamber
has a removable threaded cap that can be taken off to
check for any blockages or root growth. Once removed,
a jetting attachment to the pressure washer can be used to clean out the under drain and orifice riser if needed.

9. REPLACE ACCESS COVERS
Once maintenance is complete, replace all access
cover(s)
13

Page 391 of 2775 ends

REPLACING BIOFILTRATION MEDIA IF REQUIRED
As with all biofilter systems, at some point the biofiltration media will need to be replaced, either due to physical clogging or sorptive exhaustion (for dissolved pollutants) of the media ion exchange capacity (to remove dissolved metals and phosphorous). The general life of this media is 10 to 20 years based on site specific conditions and pollutant loading, so replacing the biofiltration media should not be a common occurrence. In the event that the biofiltration media requires replacement, contact one of Contech's Maintenance Team members at https://www.conteches.com/maintenance to order new biofiltration media. The quantity of media needed can be determined by providing the model number and unit depth. Media will be provided in super sacks for easy installation.

Each sack will weigh between 1,000 and 2,000 lbs. Biofiltration media replacement can be done following the steps below:

1. VACUUM EXISTING BIOFILTRATION MEDIA
Remove the mulch and vegetation to access the
biofiltration media, and then position the vacuum truck accordingly. Utilize the vacuum truck to vacuum out all the media. Once all media is removed, use the pressure
washer to spray down all the netting and underdrain
systems on the inside of the media containment cage.

Vacuum out any remaining debris after spraying down
netting. Inspect the netting for any damage or holes. If the netting is damaged, it can be repaired or replaced
with guidance by the manufacturer.

2. INSTALLING NEW BIOFILTRATION MEDIA
Ensure that the chamber is fully cleaned prior to
installation of new media into the media containment
cage(s). Media will be provided in super sacks for easy installation. A lifting apparatus (forklift, backhoe, boom truck, or other) is recommended to position the super
sack over the biofiltration chamber. Add media in lifts to ensure that the riser pipes remain vertical. Be sure to only fill the media cage(s) up to the same level as the old media.
14

Page 392 of 2775 ends

3. REPLANT VEGETATION
Once the media has been replaced, replant the
vegetation and cover biofiltration chamber with
approved mulch (if applicable). If the existing vegetation is not being reused, and new vegetation is being
planted, you will need to acquire new plant
establishment media that will be installed just below the mulch layer at each plant location. (see plan drawings for details). Contact one of Contech's Maintenance Team
members at https://www.conteches.com/maintenance
to order new plant establishment media.
15

Page 393 of 2775 ends

REPLACING DRAIN DOWN FILTER MEDIA (ONLY ON OLDER CALIFORNIA MODELS) NOTE: The drain down filter is only found on units installed in California prior to 2023 If during inspection it was determined that the drain down filter media requires replacement, contact one of Contech's Maintenance Team members at https://www.conteches.com/maintenance to order new media. ow As

1. REMOVE EXISTING DRAIN DOWN MEDIA
Pull knob back to unlock the locking mechanism and lift the drain down filter housing to remove the used
BioMediaGREEN filter block.

2. INSTALL NEW DRAIN DOWN MEDIA
Ensure that the chamber and housing are fully cleaned
prior to installation of new media, and then insert the new BioMediaGREEN filter block. The media filter block
should fit snugly between the chamber walls and be
centered under the filter housing. Lower the housing
over the filter block and secure the locking mechanism. 16

Page 394 of 2775 ends

NOTES

Page 395 of 2775 ends

17 CNTECH
ENGINEERED SOLUTIONS Modular Wetlands Linear
Inspection Report
Project Name
Project Address
Owner / Management Company
Contact
(city) (Zip Code)
Inspector Name
Phone ( ) -
Date / /
Type of Inspection ❑ Routine ❑ Follow Up ❑ Complaint ❑ Storm Additional Notes
Weather Condition
For Office Use Only
(Reviewed By)
(Date)
Office personnel to complete section to
the left.

Time AM/PM
Storm Event in Last 72 -hours? ❑ No ❑ Yes
Inspection Checklist
Modular Wetland System Type (Curb, Grate or UG Vault): Size (22', 14' or etc.):

Structural Integrity:

Yes
No
Comments
Damage to pre-treatment access cover (manhole cover/grate) or cannot be opened using normal lifting pressure?
Damage to discharge chamber access cover (manhole cover/grate) or cannot be opened using normal lifting pressure?
Does the MWS unit show signs of structural deterioration (cracks in the wall, damage to frame)? Is the inlet/outlet pipe or drain down pipe damaged or otherwise not functioning properly? Working Condition:

Is there evidence of illicit discharge or excessive oil, grease, or other automobile fluids entering and clogging the unit?
Is there standing water in inappropriate areas after a dry period? Is the filter insert (if applicable) at capacity and/or is there an accumulation of debris/trash on the shelf system? Does the depth of sediment/trash/debris suggest a blockage of the inflow pipe, bypass or cartridge filter? If yes specify which one in the comments section. Note depth of accumulation in in pre-treatment chamber.

Depth:

Does the cartridge filter media need replacement in pre-treatment chamber and/or discharge chamber? Chamber:

Any signs of improper functioning in the discharge chamber? Note issues in comments section.

Other Inspection Items:

Is there an accumulation of sediment/trash/debris in the wetland media (if applicable)? Is it evident that the plants are alive and healthy (if applicable)? Please note Plant Information below.

Is there a septic or foul odor coming from inside the system? Waste:

Yes
No
Sediment / Silt / Clay
Trash / Bags / Bottles
Green Waste / Leaves / Foliage
Additional Notes:

Recommended Maintenance
No Cleaning Needed
Schedule Maintenance as Planned
Needs Immediate Maintenance
Plant Information
Damage to Plants
Plant Replacement
Plant Trimming

Page 396 of 2775 ends

18 CONTECH®
Cleaning and Maintenance Report
ENGINEERED SOLUTIONS Modular Wetlands Linear
Project Name
Project Address
Owner / Management Company
Contact
(city) (Zip Code)
Inspector Name
Phone (
Date / / Time
Type of Inspection ❑ Routine D Follow Up ❑ Complaint ❑ Storm Storm Event in Last 72 -hours? ❑ No D Yes Additional Notes
For Office Use Only
(Reviewed By)
Date)
Office personnel to complete section to
the left.

Weather Condition

AM / PM
Site
Map #
GPS Coordinates
of Insert
Manufacturer /
Description / Sizing
Trash
Accumulation
Foliage
Accumulation
Sediment
Accumulation
Total Debris
Accumulation
Condition of Media
25/50/75/100
(will be changed
@ 75%)
Operational Per
Manufactures'
Specifications
(If not, why?)
Lat:

MWS
Catch Basins
Long:

MWS
Sedimentation
Basin
Media Filter
Condition
Plant Condition
Drain Down Media
Condition
Discharge Chamber
Condition
Drain Down Pipe
Condition
Inlet and Outlet
Pipe Condition
Comments:

Page 397 of 2775 ends

19 C=::NTECH

CONTECH ENGINEERED SOLUTIONS LLC PROVIDES SITE SOLUTIONS FOR THE CIVIL ENGINEERING INDUSTRY. CONTECH'S PORTFOLIO INCLUDES BRIDGES, DRAINAGE, SANITARY SEWER, STORMWATER AND EARTH STABILIZATION PRODUCTS. FOR INFORMATION ON OTHER CONTECH DIVISION OFFERINGS, VISIT CONTECHES.COM OR CALL 800-338-1122.

NOTHING IN THIS CATALOG SHOULD BE CONSTRUED AS A WARRANTY. APPLICATIONS

SUGGESTED HEREIN ARE DESCRIBED ONLY TO HELP READERS MAKE THEIR OWN EVALUATIONS

AND DECISIONS, AND ARE NEITHER GUARANTEES NOR WARRANTIES OF SUITABILITY FOR ANY APPLICATION. CONTECH MAKES NO WARRANTY WHATSOEVER, EXPRESS OR IMPLIED, RELATED TO THE APPLICATIONS, MATERIALS, COATINGS, OR PRODUCTS DISCUSSED HEREIN. ALL IMPLIED

WARRANTIES OF MERCHANTABILITY AND ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE ARE DISCLAIMED BY CONTECH. SEE CONTECH'S CONDITIONS OF SALE (AVAILABLE AT WWW.CONTECHES.COM/COS) FOR MORE INFORMATION.

SUPPORT
DRAWINGS AND SPECIFICATIONS ARE AVAILABLE AT WWW.CONTECHES.COM ModWetLinear OM Manual 03/24

Page 398 of 2775 ends

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Stormwater runoff occurs when precipitation
from rain or snowmelt flows over the ground.

Impervious surfaces like driveways, sidewalks,
and streets prevent stormwater from
naturally soaking into the ground.

Stormwater can pick up debris, chemicals, dirt, and other pollutants and flow into a storm sewer system or directly to a lake, stream, river, wetland, or coastal water. Anything that enters a storm sewer system is discharged untreated into the waterbodies we use for swimming, fishing, and providing drinking water.

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Polluted stormwater runoff can have
many adverse effects on plants, fish,
animals, and people.
• Sediment can cloud the water
and make it difficult or
impossible for aquatic plants to
grow. Sediment also can
destroy aquatic habitats.
• Excess nutrients can cause
algae blooms. When algae die,
they sink to the bottom and decompose
in a process that removes oxygen from
the water. Fish and other aquatic
organisms can't exist in water with low
dissolved oxygen levels.
• Bacteria and other pathogens can wash
into swimming areas and create health
hazards, often making beach closures
necessary.
• Debris —plastic bags, six-pack rings, bottles, and
cigarette butts —washed into waterbodies can choke, suffocate, or disable aquatic life like ducks, fish, turtles, and birds. • Household hazardous wastes like insecticides, pesticides, paint, solvents, used motor oil, and other auto fluids can poison aquatic life.

Land animals and people can become sick or die from eating diseased fish and shellfish or ingesting polluted water.
• Polluted stormwater often
affects drinking water
sources. This, in turn, can
affect human health and
increase drinking water
treatment costs.

Stormwater Pollution So(utions
6esiia ntiaf
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Lawn care
Excess fertilizers
and pesticides
applied to lawns
and gardens wash
off and pollute
streams. In
addition, yard
clippings and
leaves can wash
into storm drains and contribute
nutrients and organic matter to streams.
• Don't overwater your lawn. Consider
using a soaker hose instead of a
sprinkler.
• Use pesticides and fertilizers
sparingly. When use is necessary, use
these chemicals in the recommended
amounts. Use organic mulch or safer
pest control methods whenever
possible.
• Compost or mulch yard waste. Don't
leave it in the street or sweep it into
storm drains or streams.
• Cover piles of dirt or mulch being
used in landscaping projects.

Septic
systems
Leaking and
poorly
maintained
septic
systems release nutrients and
pathogens (bacteria and
viruses) that can be picked up
by stormwater and discharged
into nearby waterbodies.

Pathogens can cause public
health problems and
environmental concerns.

Auto care
Washing your car and
degreasing auto parts at home
can send detergents and other
contaminants through the
storm sewer system. Dumping
automotive fluids into storm
drains has the same result as
dumping the materials directly
into a waterbody.
• Use a commercial car wash that treats or
recycles its wastewater, or wash your car on
your yard so the water infiltrates into the
ground.
• Repair leaks and dispose of used auto fluids
and batteries at designated drop-off or
recycling locations.
• Inspect your system every
3 years and pump your
tank as necessary (every 3
to 5 years).
• Don't dispose of
household hazardous
waste in sinks or toilets.

Dirt, oil, and debris that collect in
parking lots and paved areas can be
washed into the storm sewer system
and eventually enter local
waterbodies.
• Sweep up litter and debris from
sidewalks, driveways and parking lots,
especially around storm drains.
• Cover grease storage and dumpsters
and keep them clean to avoid leaks.
• Report any chemical spill to the local
hazardous waste cleanup team.

They'll know the best way to keep
spills from harming the environment.

Pet waste
Resideorial ladiettpigy
Pet waste can be
a major source of
bacteria and
excess nutrients
in local waters.
• When walking
your pet,
remember to pick up the
waste and dispose of it
properly. Flushing pet
waste is the best disposal
method. Leaving pet waste
on the ground increases
public health risks by
allowing harmful bacteria
and nutrients to wash into
the storm drain and
eventually into local
waterbodies.
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cuttteatd atita aLad watetbody.

Permeable Pavement —Traditional concrete and
asphalt don't allow water to soak into the ground.

Instead these surfaces rely on storm drains to
divert unwanted water. Permeable pavement
systems allow rain and snowmelt to soak through,
decreasing stormwater runoff.

Rain Barrels —You can
collect rainwater from
rooftops in mosquito -
proof containers. The
water can be used later on
lawn or garden areas.

Rain Gardens and
Grassy Swales—Specially
designed areas planted
with native plants can provide natural places for
rainwater to collect
and soak into the
ground. Rain from
rooftop areas or paved
areas can be diverted
into these areas rather
than into storm drains.

Vegetated Filter Strips —Filter strips are areas of
native grass or plants created along roadways or
streams. They trap the pollutants stormwater
picks up as it flows across driveways and streets.

Erosion controls that aren't maintained can cause
excessive amounts of sediment and debris to be
carried into the stormwater system. Construction
vehicles can leak fuel, oil, and other harmful fluids
that can be picked up by stormwater and
deposited into local waterbodies.
• Divert stormwater away from disturbed or
exposed areas of the construction site.
• Install silt fences, vehicle mud removal areas,
vegetative cover, and other sediment and
erosion controls and properly maintain them,
especially after rainstorms.
• Prevent soil erosion by minimizing disturbed
areas during construction projects, and seed
and mulch bare areas as soon as possible.

Lack of vegetation on streambanks can lead to erosion. Overgrazed pastures can also contribute excessive amounts of sediment to local waterbodies. Excess fertilizers and pesticides can poison aquatic animals and lead to destructive algae blooms. Livestock in streams can contaminate waterways with bacteria, making them unsafe for human contact. • Keep livestock away from streambanks and provide
them a water source away from waterbodies.
• Store and apply manure away from waterbodies and in
accordance with a nutrient management plan.
• Vegetate riparian areas along waterways.
• Rotate animal grazing to prevent soil erosion in fields. • Apply fertilizers and pesticides according to label
instructions to save money and minimize pollution.

Improperly managed logging operations can result in erosion and sedimentation.
• Conduct preharvest planning to prevent erosion and lower costs. • Use logging methods and equipment that minimize soil disturbance. • Plan and design skid trails, yard areas, and truck access roads to minimize stream crossings and avoid disturbing the forest floor. • Construct stream crossings so that they minimize erosion and physical changes to streams.
• Expedite revegetation of cleared areas.

Page 400 of 2775 ends

Uncovered fueling stations allow spills to be
washed into storm drains. Cars waiting to be
repaired can leak fuel, oil, and other harmful
fluids that can be picked up by stormwater.
• Clean up spills immediately and properly
dispose of cleanup materials.
• Provide cover over fueling stations and
design or retrofit facilities for spill
containment.
• Properly maintain fleet vehicles to prevent
oil, gas, and other discharges from being
washed into local waterbodies.
• Install and maintain oil/water separators.

Trash Storage Areas
SD -32
Description
Trash storage areas are areas where a trash receptacle (s) are located for use as a repository for solid wastes. Stormwater runoff from areas where trash is stored or disposed of can be polluted. In addition, loose trash and debris can be easily transported by water or wind into nearby storm drain inlets, channels, and/or creeks. Waste handling operations that may be sources of stormwater pollution include dumpsters, litter control, and waste piles.

Approach
This fact sheet contains details on the specific measures required to prevent or reduce pollutants in stormwater runoff associated with trash storage and handling. Preventative measures
including enclosures, containment structures, and impervious pavements to mitigate spills, should be used to reduce the likelihood of contamination.

Design Objectives
Maximize Infiltration
Provide Retention
Slow Runoff
Minimize Impervious Land
Coverage
Prohibit Dumping of Improper
Materials
0 Contain Pollutants
Collect and Convey
Suitable Applications
Appropriate applications include residential, commercial and industrial areas planned for development or redevelopment. (Detached residential single-family homes are typically excluded from this requirement.)
Design Considerations
Design requirements for waste handling areas are governed by Building and Fire Codes, and by current local agency ordinances and zoning requirements. The design criteria described in this fact sheet are meant to enhance and be consistent with these code and ordinance requirements.

Hazardous waste should be handled in accordance with legal requirements established in Title 22, California Code of Regulation.

Wastes from commercial and industrial sites are typically hauled by either public or commercial carriers that may have design or access requirements for waste storage areas. The design criteria in this fact sheet are recommendations and are not intended to be in conflict with requirements established by the waste hauler. The waste hauler should be contacted prior to the design of your site trash collection areas. Conflicts or issues should be discussed with the local agency.

Designing New Installations
Trash storage areas should be designed to consider the following structural or treatment control BMPs:
• Design trash container areas so that drainage from adjoining roofs and pavement is diverted around the area(s) to avoid run-on. This might include berming or grading the waste handling area to prevent run-on of stormwater.
• Make sure trash container areas are screened or walled to prevent off -site transport of trash.

CALIFORNIA STORMWATER
!IT)
January 2003
California Stormwater BMP Handbook
New Development and Redevelopment
Page.c143l {a2757®cs.com
1 of 2

SD -32 Trash Storage Areas
• Use lined bins or dumpsters to reduce leaking of liquid waste. • Provide roofs, awnings, or attached lids on all trash containers to minimize direct precipitation and prevent rainfall from entering containers. • Pave trash storage areas with an impervious surface to mitigate spills. • Do not locate storm drains in immediate vicinity of the trash storage area. • Post signs on all dumpsters informing users that hazardous materials are not to be disposed of therein.

Redeveloping Existing Installations
Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.) define "redevelopment" in terms of amounts of additional impervious area, increases in gross floor area and/or exterior construction, and land disturbing activities with structural or impervious surfaces. The definition of " redevelopment" must be consulted to determine whether or not the requirements for new development apply to areas intended for redevelopment. If the definition applies, the steps outlined under "designing new installations" above should be followed.

Additional Information
Maintenance Considerations
The integrity of structural elements that are subject to damage (i.e., screens, covers, and signs) must be maintained by the owner/operator. Maintenance agreements between the local agency and the owner/operator may be required. Some agencies will require maintenance deed restrictions to be recorded of the property title. If required by the local agency, maintenance agreements or deed restrictions must be executed by the owner/operator before improvement plans are approved.

Other Resources
A Manual for the Standard Urban Stormwater Mitigation Nan (SUSMP), Los Angeles County Department of Public Works, May 2OO2.

Model Standard Urban Storm Water Mitigation Nan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2OO2.

Model Water Quality Management Nan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2003.

Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures, July 2OO2.
2 of 2 California Stormwater BMP Handbook
New Development and Redevelopment
www•cPagea46524f.22775
January 2003

Photo Credit: Geoff Brosseau
Fueling Areas SD -30
Design Objectives
Maximize Infiltration
Provide Retention
Slow Runoff
Minimize Impervious Land
Coverage
Prohibit Dumping of Improper
Materials
• Contain Pollutants
Q Collect and Convey
Description
Fueling areas have the potential to contribute oil and grease, solvents, car battery acid, coolant and gasoline to the stormwater conveyance system. Spills at vehicle and equipment fueling areas can be a significant source of pollution because fuels contain toxic materials and heavy metals that are not easily removed by stormwater treatment devices.

Approach
Project plans must be developed for cleaning near fuel dispensers, emergency spill cleanup, containment, and leak prevention.

Suitable Applications
Appropriate applications include commercial, industrial, and any other areas planned to have fuel dispensing equipment, including retail gasoline outlets, automotive repair shops, and major non -retail dispensing areas.

Design Considerations
Design requirements for fueling areas are governed by Building and Fire Codes and by current local agency ordinances and zoning requirements. Design requirements described in this fact sheet are meant to enhance and be consistent with these code and ordinance requirements.

Designing New Installations
Covering
\LlI 11 F.1-'
January 2003
California Stormwater BMP Handbook
New Development and Redevelopment
Page.LIEOM{a N3<s.com
1 of 3

SD -30 Fueling Areas
Fuel dispensing areas should provide an overhanging roof structure or canopy. The cover's minimum dimensions must be equal to or greater than the area within the grade break. The cover must not drain onto the fuel dispensing area and the downspouts must be routed to prevent drainage across the fueling area. The fueling area should drain to the project's treatment control BMP(s) prior to discharging to the stormwater conveyance system. Note - If fueling large equipment or vehicles that would prohibit the use of covers or roofs, the fueling island should be designed to sufficiently accommodate the larger vehicles and equipment and to prevent stormwater run-on and runoff. Grade to direct stormwater to a dead-end sump.

Surfacing
Fuel dispensing areas should be paved with Portland cement concrete (or equivalent smooth impervious surface). The use of asphalt concrete should be prohibited. Use asphalt sealant to protect asphalt paved areas surrounding the fueling area. This provision may be made to sites that have pre-existing asphalt surfaces.

The concrete fuel dispensing area should be extended a minimum of 6.5 ft from the corner of each fuel dispenser, or the length at which the hose and nozzle assembly may be operated plus i ft, whichever is less.

Grading/Contouring
Dispensing areas should have an appropriate slope to prevent ponding, and be separated from the rest of the site by a grade break that prevents run-on of urban runoff. (Slope is required to be 2 to 4% in some jurisdictions' stormwater management and mitigation plans.) Fueling areas should be graded to drain toward a dead-end sump. Runoff from downspouts/roofs should be directed away from fueling areas. Do not locate storm drains in the immediate vicinity of the fueling area.

Additional Information
• In the case of an emergency, provide storm drain seals, such as isolation valves, drain plugs, or drain covers, to prevent spills or contaminated stormwater from entering the stormwater conveyance system.

Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County Department of Public Works, May 2OO2.

Model Standard Urban Storm Water Mitigation Plan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2OO2. 2 of 3 California Stormwater BMP Handbook
New Development and Redevelopment
www.c ea4)44f . 5
January 2003

Fueling Areas SD -30
Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2OO3.

Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures, July 2OO2.

January 2003
California Stormwater BMP Handbook
New Development and Redevelopment
Page.05ilO{a N3<s.com
3 of 3

Description
Storm Drain Signage SD -13
Design Objectives
Maximize Infiltration
Provide Retention
Slow Runoff
Minimize Impervious Land
Coverage
Prohibit Dumping of Improper
Materials
Contain Pollutants
Collect and Convey
Waste materials dumped into storm drain inlets can have severe impacts on receiving and ground waters. Posting notices regarding discharge prohibitions at storm drain inlets can prevent waste dumping. Storm drain signs and stencils are highly visible source controls that are typically placed directly adjacent to storm drain inlets.

Approach
The stencil or affixed sign contains a brief statement that prohibits dumping of improper materials into the urban runoff conveyance system. Storm drain messages have become a popular method of alerting the public about the effects of and the prohibitions against waste disposal.

Suitable Applications
Stencils and signs alert the public to the destination of pollutants discharged to the storm drain.

Signs are appropriate in residential, commercial, and industrial areas, as well as any other area where contributions or dumping to storm drains is likely.

Design Considerations
Storm drain message markers or placards are recommended at all storm drain inlets within the boundary of a development project. The marker should be placed in clear sight facing toward anyone approaching the inlet from either side. All storm drain inlet locations should be identified on the development site map.

Designing New Installations
The following methods should be considered for inclusion in the project design and show on project plans:
• Provide stenciling or labeling of all storm drain inlets and catch basins, constructed or modified, within the project area with prohibitive language. Examples include "NO DUMPING

CALWORN'IA STORMWATER
!IT)
January 2003
California Stormwater BMP Handbook
New Development and Redevelopment
Page. fl61Ii 241378<s. co m
1 of 2

SD -13 Storm Drain Signage
— DRAINS TO OCEAN" and/or other graphical icons to discourage illegal dumping. • Post signs with prohibitive language and/or graphical icons, which prohibit illegal dumping at public access points along channels and creeks within the project area.

Note - Some local agencies have approved specific signage and/or storm drain message placards for use. Consult local agency stormwater staff to determine specific requirements for placard types and methods of application.

Redeveloping Existing Installations
Various jurisdictional stormwater management and mitigation plans (SUSMP, WQMP, etc.) define "redevelopment" in terms of amounts of additional impervious area, increases in gross floor area and/or exterior construction, and land disturbing activities with structural or impervious surfaces. If the project meets the definition of "redevelopment", then the requirements stated under " designing new installations" above should be included in all project design plans.

Additional Information
Maintenance Considerations
• Legibility of markers and signs should be maintained. If required by the agency with jurisdiction over the project, the owner/operator or homeowner's association should enter into a maintenance agreement with the agency or record a deed restriction upon the property title to maintain the legibility of placards or signs.

Placement
• Signage on top of curbs tends to weather and fade.
• Signage on face of curbs tends to be worn by contact with vehicle tires and sweeper brooms.

Supplemental Information
Examples
• Most MS4 programs have storm drain signage programs. Some MS4 programs will provide stencils, or arrange for volunteers to stencil storm drains as part of their outreach program.

Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County Department of Public Works, May 2OO2.

Model Standard Urban Storm Water Mitigation Nan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2OO2.

Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2OO3.

Efficient Irrigation SD -12
Design Objectives
Q Maximize Infiltration
O Provide Retention
O Slow Runoff
Minimize Impervious Land
Coverage
Prohibit Dumping of Improper
Materials
Contain Pollutants
Collect and Convey
Description
Irrigation water provided to landscaped areas may result in excess irrigation water being conveyed into stormwater drainage systems.

Approach
Project plan designs for development and redevelopment should include application methods of irrigation water that minimize runoff of excess irrigation water into the stormwater conveyance system.

Suitable Applications
Appropriate applications include residential, commercial and industrial areas planned for development or redevelopment. (Detached residential single-family homes are typically excluded from this requirement.)
Design Considerations
Designing New Installations
The following methods to reduce excessive irrigation runoff should be considered, and incorporated and implemented where determined applicable and feasible by the Permittee:
• Employ rain -triggered shutoff devices to prevent irrigation after precipitation. • Design irrigation systems to each landscape area's specific water requirements. • Include design featuring flow reducers or shutoff valves triggered by a pressure drop to control water loss in the event of broken sprinkler heads or lines.
• Implement landscape plans consistent with County or City water conservation resolutions, which may include provision of water sensors, programmable irrigation times (for short cycles), etc.
\LlI 11 F.1-'
January 2003
California Stormwater BMP Handbook
New Development and Redevelopment
Page.468,1,:2cRas.com
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SD -12 Efficient Irrigation
• Design timing and application methods of irrigation water to minimize the runoff of excess irrigation water into the storm water drainage system.
■ Group plants with similar water requirements in order to reduce excess irrigation runoff and promote surface filtration. Choose plants with low irrigation requirements (for example, native or drought tolerant species). Consider design features such as:

Using mulches (such as wood chips or bar) in planter areas without ground cover to minimize sediment in runoff
Installing appropriate plant materials for the location, in accordance with amount of sunlight and climate, and use native plant materials where possible and/or as recommended by the landscape architect
Leaving a vegetative barrier along the property boundary and interior watercourses, to act as a pollutant filter, where appropriate and feasible - Choosing plants that minimize or eliminate the use of fertilizer or pesticides to sustain growth
• Employ other comparable, equally effective methods to reduce irrigation water runoff.

Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County Department of Public Works, May 2OO2.

Model Standard Urban Storm Water Mitigation Nan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2OO2.

Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2003.

Site Design & Landscape Planning SD -10
Design Objectives
Maximize Infiltration
Q Provide Retention
Q Slow Runoff
Minimize Impervious Land
Coverage
Prohibit Dumping of Improper
Materials
Contain Pollutants
Collect and Convey
Description
Each project site possesses unique topographic, hydrologic, and vegetative features, some of which are more suitable for development than others. Integrating and incorporating appropriate landscape planning methodologies into the project design is the most effective action that can be done to minimize surface and groundwater contamination from stormwater.

Approach
Landscape planning should couple consideration of land suitability for urban uses with consideration of community goals and projected growth. Project plan designs should conserve natural areas to the extent possible, maximize natural water storage and infiltration opportunities, and protect slopes and channels.

Suitable Applications
Appropriate applications include residential, commercial and industrial areas planned for development or redevelopment.

Design Considerations
Design requirements for site design and landscapes planning should conform to applicable standards and specifications of agencies with jurisdiction and be consistent with applicable General Nan and Local Area Nan policies.
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SD -10 Site Design & Landscape Planning
Designing New Installations
Begin the development of a plan for the landscape unit with attention to the following general principles:
• Formulate the plan on the basis of clearly articulated community goals. Carefully identify conflicts and choices between retaining and protecting desired resources and community growth.
• Map and assess land suitability for urban uses. Include the following landscape features in the assessment: wooded land, open unwooded land, steep slopes, erosion -prone soils, foundation suitability, soil suitability for waste disposal, aquifers, aquifer recharge areas, wetlands, floodplains, surface waters, agricultural lands, and various categories of urban land use. When appropriate, the assessment can highlight outstanding local or regional resources that the community determines should be protected (e.g., a scenic area, recreational area, threatened species habitat, farmland, fish run). Mapping and assessment should recognize not only these resources but also additional areas needed for their sustenance.

Project plan designs should conserve natural areas to the extent possible, maximize natural water storage and infiltration opportunities, and protect slopes and channels.

Conserve Natural Areas during Landscape Planning
If applicable, the following items are required and must be implemented in the site layout during the subdivision design and approval process, consistent with applicable General Plan and Local Area Plan policies:
• Cluster development on least -sensitive portions of a site while leaving the remaining land in a natural undisturbed condition.
• Limit clearing and grading of native vegetation at a site to the minimum amount needed to build lots, allow access, and provide fire protection.
• Maximize trees and other vegetation at each site by planting additional vegetation, clustering tree areas, and promoting the use of native and/or drought tolerant plants. ■ Promote natural vegetation by using parking lot islands and other landscaped areas. ■ Preserve riparian areas and wetlands.

Maximize Natural Water Storage and Infiltration Opportunities Within the Landscape Unit • Promote the conservation of forest cover. Building on land that is already deforested affects basin hydrology to a lesser extent than converting forested land. Loss of forest cover reduces interception storage, detention in the organic forest floor layer, and water losses by evapotranspiration, resulting in large peak runoff increases and either their negative effects or the expense of countering them with structural solutions. • Maintain natural storage reservoirs and drainage corridors, including depressions, areas of permeable soils, swales, and intermittent streams. Develop and implement policies and 2 of 4 California Stormwater BMP Handbook
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Site Design & Landscape Planning SD -10
regulations to discourage the clearing, filling, and channelization of these features. Utilize them in drainage networks in preference to pipes, culverts, and engineered ditches. • Evaluating infiltration opportunities by referring to the stormwater management manual for the jurisdiction and pay particular attention to the selection criteria for avoiding groundwater contamination, poor soils, and hydrogeological conditions that cause these facilities to fail. If necessary, locate developments with large amounts of impervious surfaces or a potential to produce relatively contaminated runoff away from groundwater recharge areas.

Protection of Slopes and Channels during Landscape Design • Convey runoff safely from the tops of slopes.
• Avoid disturbing steep or unstable slopes.
• Avoid disturbing natural channels.
• Stabilize disturbed slopes as quickly as possible.
• Vegetate slopes with native or drought tolerant vegetation. • Control and treat flows in landscaping and/or other controls prior to reaching existing natural drainage systems.
• Stabilize temporary and permanent channel crossings as quickly as possible, and ensure that increases in run-off velocity and frequency caused by the project do not erode the channel. • Install energy dissipaters, such as riprap, at the outlets of new storm drains, culverts, conduits, or channels that enter unlined channels in accordance with applicable specifications to minimize erosion. Energy dissipaters shall be installed in such a way as to minimize impacts to receiving waters.
• Line on -site conveyance channels where appropriate, to reduce erosion caused by increased flow velocity due to increases in tributary impervious area. The first choice for linings should be grass or some other vegetative surface, since these materials not only reduce runoff velocities, but also provide water quality benefits from filtration and infiltration. If velocities in the channel are high enough to erode grass or other vegetative linings, riprap, concrete, soil cement, or geo-grid stabilization are other alternatives. • Consider other design principles that are comparable and equally effective.

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SD -10 Site Design & Landscape Planning
Redevelopment may present significant opportunity to add features which had not previously been implemented. Examples include incorporation of depressions, areas of permeable soils, and swales in newly redeveloped areas. While some site constraints may exist due to the status of already existing infrastructure, opportunities should not be missed to maximize infiltration, slow runoff, reduce impervious areas, disconnect directly connected impervious areas.

Other Resources
A Manual for the Standard Urban Stormwater Mitigation Plan (SUSMP), Los Angeles County Department of Public Works, May 2002.

Stormwater Management Manual for Western Washington, Washington State Department of Ecology, August 2001.

Model Standard Urban Storm Water Mitigation Nan (SUSMP) for San Diego County, Port of San Diego, and Cities in San Diego County, February 14, 2002.

Model Water Quality Management Plan (WQMP) for County of Orange, Orange County Flood Control District, and the Incorporated Cities of Orange County, Draft February 2003.

Ventura Countywide Technical Guidance Manual for Stormwater Quality Control Measures, July 2002.
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Drainage System Maintenance SC -44
Description
As a consequence of its function, the stormwater conveyance system collects and transports urban runoff and stormwater that may contain certain pollutants. The protocols in this fact sheet are intended to reduce pollutants reaching receiving waters through proper conveyance system operation and maintenance.

Approach
Pollution Prevention
Maintain catch basins, stormwater inlets, and other stormwater conveyance structures on a regular basis to remove pollutants, reduce high pollutant concentrations during the first flush of storms, prevent clogging of the downstream conveyance system, restore catch basins' sediment trapping capacity, and ensure the system functions properly hydraulically to avoid flooding.

Suggested Protocols
Catch Basins/Inlet Structures
■ Staff should regularly inspect facilities to ensure compliance with the following:
- Immediate repair of any deterioration threatening
structural integrity.
- Cleaning before the sump is 40% full. Catch basins
should be cleaned as frequently as needed to meet this
standard.

Stenciling of catch basins and inlets (see SC34 Waste
Handling and Disposal).

Objectives
• Cover
• Contain
• Educate
• Reduce/Minimize
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
SQA
California
Stormwater
Quality
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SC -44 Drainage System Maintenance
• Clean catch basins, storm drain inlets, and other conveyance structures before the wet season to remove sediments and debris accumulated during the summer. • Conduct inspections more frequently during the wet season for problem areas where sediment or trash accumulates more often. Clean and repair as needed. • Keep accurate logs of the number of catch basins cleaned. • Store wastes collected from cleaning activities of the drainage system in appropriate containers or temporary storage sites in a manner that prevents discharge to the storm drain.
• Dewater the wastes if necessary with outflow into the sanitary sewer if permitted. Water should be treated with an appropriate filtering device prior to discharge to the sanitary sewer. If discharge to the sanitary sewer is not allowed, water should be pumped or vacuumed to a tank and properly disposed. Do not dewater near a storm drain or stream.

Storm Drain Conveyance System
■ Locate reaches of storm drain with deposit problems and develop a flushing schedule that keeps the pipe clear of excessive buildup.
• Collect and pump flushed effluent to the sanitary sewer for treatment whenever possible.

Pump Stations
■ Clean all storm drain pump stations prior to the wet season to remove silt and trash. • Do not allow discharge to reach the storm drain system when cleaning a storm drain pump station or other facility.
• Conduct routine maintenance at each pump station.
• Inspect, clean, and repair as necessary all outlet structures prior to the wet season.

Open Channel
■ Modify storm channel characteristics to improve channel hydraulics, increase pollutant removals, and enhance channel/creek aesthetic and habitat value. • Conduct channel modification/improvement in accordance with existing laws. Any person, government agency, or public utility proposing an activity that will change the natural (emphasis added) state of any river, stream, or lake in California, must enter into a Steam or Lake Alteration Agreement with the Department of Fish and Game. The developer -applicant should also contact local governments (city, county, special districts), other state agencies (SWRCB, RWQCB, Department of Forestry, Department of Water Resources), and Federal Corps of Engineers and USFWS.

Illicit Connections and Discharges
• Look for evidence of illegal discharges or illicit connections during routine maintenance of conveyance system and drainage structures:
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- Are there any odors associated with the drainage system? - Record locations of apparent illegal discharges/illicit connections? - Track flows back to potential dischargers and conduct aboveground inspections. This can be done through visual inspection of upgradient manholes or alternate techniques including zinc chloride smoke testing, fluorometric dye testing, physical inspection testing, or television camera inspection.

Eliminate the discharge once the origin of flow is established. • Stencil or demarcate storm drains, where applicable, to prevent illegal disposal of pollutants.

Storm drain inlets should have messages such as "Dump No Waste Drains to Stream" stenciled next to them to warn against ignorant or intentional dumping of pollutants into the storm drainage system.
• Refer to fact sheet SC-io Non-Stormwater Discharges.

Illegal Dumping
• Inspect and clean up hot spots and other storm drainage areas regularly where illegal dumping and disposal occurs.
• Establish a system for tracking incidents. The system should be designed to identify the following:
- Illegal dumping hot spots
- Types and quantities (in some cases) of wastes
- Patterns in time of occurrence (time of day/night, month, or year) Mode of dumping (abandoned containers, "midnight dumping" from moving vehicles, direct dumping of materials, accidents/spills)
- Responsible parties
• Post "No Dumping" signs in problem areas with a phone number for reporting dumping and disposal. Signs should also indicate fines and penalties for illegal dumping. • Refer to fact sheet SC-io Non-Stormwater Discharges.

Training
• Train crews in proper maintenance activities, including record keeping and disposal. • Allow only properly trained individuals to handle hazardous materials/wastes. • Have staff involved in detection and removal of illicit connections trained in the following:
- OSHA -required Health and Safety Training (29 CFR 1910.120) plus annual refresher training (as needed).

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SC -44 Drainage System Maintenance
- OSHA Confined Space Entry training (Cal -OSHA Confined Space, Title 8 and Federal OSHA 29 CFR 191O.146).
- Procedural training (field screening, sampling, smoke/dye testing, TV inspection).

Spill Response and Prevention
• Investigate all reports of spills, leaks, and/or illegal dumping promptly. • Clean up all spills and leaks using "dry" methods (with absorbent materials and/or rags) or dig up, remove, and properly dispose of contaminated soil. • Refer to fact sheet SC -n Spill Prevention, Control, and Cleanup.

Other Considerations (Limitations and Regulations)
• Clean-up activities may create a slight disturbance for local aquatic species. Access to items and material on private property may be limited. Trade-offs may exist between channel hydraulics and water quality/riparian habitat. If storm channels or basins are recognized as wetlands, many activities, including maintenance, may be subject to regulation and permitting.
• Storm drain flushing is most effective in small diameter pipes (36 -inch diameter pipe or less, depending on water supply and sediment collection capacity). Other considerations associated with storm drain flushing may include the availability of a water source, finding a downstream area to collect sediments, liquid/sediment disposal, and prohibition against disposal of flushed effluent to sanitary sewer in some areas. • Regulations may include adoption of substantial penalties for illegal dumping and disposal. • Local municipal codes may include sections prohibiting discharge of soil, debris, refuse, hazardous wastes, and other pollutants into the storm drain system.

Requirements
Costs
• An aggressive catch basin cleaning program could require a significant capital and O&M budget.
• The elimination of illegal dumping is dependent on the availability, convenience, and cost of alternative means of disposal. The primary cost is for staff time. Cost depends on how aggressively a program is implemented. Other cost considerations for an illegal dumping program include:
- Purchase and installation of signs.
- Rental of vehicle(s) to haul illegally -disposed items and material to landfills. - Rental of heavy equipment to remove larger items (e.g., car bodies) from channels. - Purchase of landfill space to dispose of illegally -dumped items and material. 4 of 6 California Stormwater BMP Handbook
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• Methods used for illicit connection detection (smoke testing, dye testing, visual inspection, and flow monitoring) can be costly and time-consuming. Site -specific factors, such as the level of impervious area, the density and ages of buildings, and type of land use will determine the level of investigation necessary.

Maintenance
• Two -person teams may be required to clean catch basins with vactor trucks. • Teams of at least two people plus administrative personnel are required to identify illicit discharges, depending on the complexity of the storm sewer system. • Arrangements must be made for proper disposal of collected wastes. • Technical staff are required to detect and investigate illegal dumping violations.

Supplemental Information
Further Detail of the BMP
Storm Drain Flushing
Flushing is a common maintenance activity used to improve pipe hydraulics and to remove pollutants in storm drainage systems. Flushing may be designed to hydraulically convey accumulated material to strategic locations, such as an open channel, another point where flushing will be initiated, or the sanitary sewer and the treatment facilities, thus preventing resuspension and overflow of a portion of the solids during storm events. Flushing prevents "plug flow" discharges of concentrated pollutant loadings and sediments. Deposits can hinder the designed conveyance capacity of the storm drain system and potentially cause backwater conditions in severe cases of clogging.

Storm drain flushing usually takes place along segments of pipe with grades that are too flat to maintain adequate velocity to keep particles in suspension. An upstream manhole is selected to place an inflatable device that temporarily plugs the pipe. Further upstream, water is pumped into the line to create a flushing wave. When the upstream reach of pipe is sufficiently full to cause a flushing wave, the inflated device is rapidly deflated with the assistance of a vacuum pump, thereby releasing the backed up water and resulting in the cleaning of the storm drain segment.

To further reduce impacts of stormwater pollution, a second inflatable device placed well downstream may be used to recollect the water after the force of the flushing wave has dissipated. A pump may then be used to transfer the water and accumulated material to the sanitary sewer for treatment. In some cases, an interceptor structure may be more practical or required to recollect the flushed waters.

It has been found that cleansing efficiency of periodic flush waves is dependent upon flush volume, flush discharge rate, sewer slope, sewer length, sewer flow rate, sewer diameter, and population density. As a rule of thumb, the length of line to be flushed should not exceed 700 feet. At this maximum recommended length, the percent removal efficiency ranges between 65- 75% for organics and 55-65% for dry weather grit/inorganic material. The percent removal efficiency drops rapidly beyond that. Water is commonly supplied by a water truck, but fire hydrants can also supply water. To make the best use of water, it is recommended that reclaimed water be used or that fire hydrant line flushing coincide with storm sewer flushing.

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SC -44 Drainage System Maintenance
References and Resources
California's Nonpoint Source Program Nan http://www.swrcb.ca.gov/nps/index.html Clark County Storm Water Pollution Control Manual
http://www.co.clark.wa.us/pubworks/bmpman.pdf
Ferguson, B.K. 1991. Urban Stream Reclamation, p. 324-322, Journal of Soil and Water Conservation.

King County Storm Water Pollution Control Manual http://dnr.metrokc.gov/wlr/dss/spcm.htm Oregon Association of Clean Water Agencies. Oregon Municipal Stormwater Toolbox for Maintenance Practices. June 1998.

Santa Clara Valley Urban Runoff Pollution Prevention Program http://www.scvurppp.org The Storm Water Managers Resource Center http://www.stormwatercenter.net United States Environmental Protection Agency (USEPA). 2OO2. Pollution Prevention/Good Housekeeping for Municipal Operations Storm Drain System Cleaning. On line:
http://www.epa.gov/npdes/menuofbmps/poll 16.htm
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Parking/Storage Area Maintenance SC -43
Description
Parking lots and storage areas can contribute a number of substances, such as trash, suspended solids, hydrocarbons, oil and grease, and heavy metals that can enter receiving waters through stormwater runoff or non-stormwater discharges. The following protocols are intended to prevent or reduce the discharge of pollutants from parking/storage areas and include using good housekeeping practices, following appropriate cleaning BMPs, and training employees.

Approach
Pollution Prevention
• Encourage alternative designs and maintenance strategies for impervious parking lots. (See New Development and
Redevelopment BMP Handbook).
• Keep accurate maintenance logs to evaluate BMP
implementation.

Suggested Protocols
General
• Keep the parking and storage areas clean and orderly.

Remove debris in a timely fashion.
• Allow sheet runoff to flow into biofilters (vegetated strip and swale) and/or infiltration devices.
• Utilize sand filters or oleophilic collectors for oily waste in low concentrations.

Objectives
• Cover
• Contain
• Educate
• Reduce/Minimize
• Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
0 0 0 0 0 0 0 0
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SC -43 Parking/Storage Area Maintenance
• Arrange rooftop drains to prevent drainage directly onto paved surfaces. • Design lot to include semi -permeable hardscape.

Controlling Litter
• Post "No Littering" signs and enforce anti -litter laws. • Provide an adequate number of litter receptacles.
• Clean out and cover litter receptacles frequently to prevent spillage. • Provide trash receptacles in parking lots to discourage litter. • Routinely sweep, shovel and dispose of litter in the trash.

Surface cleaning
• Use dry cleaning methods (e.g. sweeping or vacuuming) to prevent the discharge of pollutants into the stormwater conveyance system.
• Establish frequency of public parking lot sweeping based on usage and field observations of waste accumulation.
• Sweep all parking lots at least once before the onset of the wet season. • If water is used follow the procedures below:
- Block the storm drain or contain runoff.
- Wash water should be collected and pumped to the sanitary sewer or discharged to a pervious surface, do not allow wash water to enter storm drains. - Dispose of parking lot sweeping debris and dirt at a landfill. • When cleaning heavy oily deposits:
- Use absorbent materials on oily spots prior to sweeping or washing. - Dispose of used absorbents appropriately.

Surface Repair
• Pre -heat, transfer or load hot bituminous material away from storm drain inlets. • Apply concrete, asphalt, and seal coat during dry weather to prevent contamination form contacting stormwater runoff.
• Cover and seal nearby storm drain inlets (with waterproof material or mesh) and manholes before applying seal coat, slurry seal, etc., where applicable. Leave covers in place until job is complete and until all water from emulsified oil sealants has drained or evaporated. Clean any debris from these covered manholes and drains for proper disposal. 2 of 4 California Stormwater BMP Handbook
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• Use only as much water as necessary for dust control, to avoid runoff. • Catch drips from paving equipment that is not in use with pans or absorbent material placed under the machines. Dispose of collected material and absorbents properly.

Inspection
• Have designated personnel conduct inspections of the parking facilities and stormwater conveyance systems associated with them on a regular basis. • Inspect cleaning equipment/sweepers for leaks on a regular basis.

Training
• Provide regular training to field employees and/or contractors regarding cleaning of paved areas and proper operation of equipment.
• Train employees and contractors in proper techniques for spill containment and cleanup.

Spill Response and Prevention
• Refer to SC -ii, Spill Prevention, Control & Cleanup. • Keep your Spill Prevention Control and countermeasure (SPCC) plan up-to-date, nad implement accordingly.
• Have spill cleanup materials readily available and in a known location. • Cleanup spills immediately and use dry methods if possible. • Properly dispose of spill cleanup material.

Other Considerations
• Limitations related to sweeping activities at large parking facilities may include high equipment costs, the need for sweeper operator training, and the inability of current sweeper technology to remove oil and grease.

Requirements
Costs
Cleaning/sweeping costs can be quite large, construction and maintenance of stormwater structural controls can be quite expensive as well.

Maintenance
• Sweep parking lot to minimize cleaning with water.
• Clean out oil/water/sand separators regularly, especially after heavy storms. • Clean parking facilities on a regular basis to prevent accumulated wastes and pollutants from being discharged into conveyance systems during rainy conditions.

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SC -43 Parking/Storage Area Maintenance
Supplemental Information
Further Detail of the BMP
Surface Repair
Apply concrete, asphalt, and seal coat during dry weather to prevent contamination form contacting stormwater runoff. Where applicable, cover and seal nearby storm drain inlets (with waterproof material or mesh) and manholes before applying seal coat, slurry seal, etc. Leave covers in place until job is complete and until all water from emulsified oil sealants has drained or evaporated. Clean any debris from these covered manholes and drains for proper disposal.

Use only as much water as necessary for dust control, to avoid runoff.

References and Resources
http://www.stormwatercenter.net/
California's Nonpoint Source Program Nan http://www.swrcb.ca.gov/nps/index.html Model Urban Runoff Program: A How -To Guide for Developing Urban Runoff Programs for Small Municipalities. Prepared by City of Monterey, City of Santa Cruz, California Coastal Commission, Monterey Bay National Marine Sanctuary, Association of Monterey Bay Area Governments, Woodward -Clyde, Central Coast Regional Water Quality control Board. July 1998 (Revised February 2002 by the California Coastal Commission).

Orange County Stormwater Program
http://www.ocwatersheds.com/StormWater/swp_introduction.asp Oregon Association of Clean Water Agencies. Oregon Municipal Stormwater Toolbox for Maintenance Practices. June 1998.

Pollution from Surface Cleaning Folder. 1996. Bay Area Stormwater Management Agencies Association (BASMAA) http://www.basma.org
San Diego Stormwater Co-permittees Jurisdictional Urban Runoff Management Program (URMP)
http: // www.proj ectcleanwater.org/pdf/Model%2o Program%2oMunicipal%2 oFacilities. pdf 4 of 4 California Stormwater BMP Handbook
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Building & Grounds Maintenance SC -41
Description
Stormwater runoff from building and grounds maintenance activities can be contaminated with toxic hydrocarbons in solvents, fertilizers and pesticides, suspended solids, heavy metals, and abnormal pH. Utilizing the following protocols will prevent or reduce the discharge of pollutants to stormwater from building and grounds maintenance activities by washing and cleaning up with as little water as possible, following good landscape management practices, preventing and cleaning up spills immediately, keeping debris from entering the storm drains, and maintaining the stormwater collection system.

Approach
Pollution Prevention
• Switch to non-toxic chemicals for maintenance when
possible.
• Choose cleaning agents that can be recycled.
• Encourage proper lawn management and landscaping,
including use of native vegetation.
• Encourage use of Integrated Pest Management techniques for pest control.
• Encourage proper onsite recycling of yard trimmings.
• Recycle residual paints, solvents, lumber, and other material as much as possible.

Objectives
• Cover
• Contain
• Educate
• Reduce/Minimize
• Product Substitution
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Oxygen Demanding
0 0 0 0 0 0 0 0
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SC -41 Building & Grounds Maintenance
Suggested Protocols
Pressure Washing of Buildings, Rooftops, and Other Large Objects • In situations where soaps or detergents are used and the surrounding area is paved, pressure washers must use a waste water collection device that enables collection of wash water and associated solids. A sump pump, wet vacuum or similarly effective device must be used to collect the runoff and loose materials. The collected runoff and solids must be disposed of properly.
• If soaps or detergents are not used, and the surrounding area is paved, wash water runoff does not have to be collected but must be screened. Pressure washers must use filter fabric or some other type of screen on the ground and/or in he catch basin to trap the particles in wash water runoff.
• If you are pressure washing on a grassed area (with or without soap), runoff must be dispersed as sheet flow as much as possible, rather than as a concentrated stream. The wash runoff must remain on the grass and not drain to pavement. Ensure that this practice does not kill grass.

Landscaping Activities
• Do not apply any chemicals (insecticide, herbicide, or fertilizer) directly to surface waters, unless the application is approved and permitted by the state. • Dispose of grass clippings, leaves, sticks, or other collected vegetation as garbage, or by composting. Do not dispose of collected vegetation into waterways or storm drainage systems.
• Use mulch or other erosion control measures on exposed soils. ■ Check irrigation schedules so pesticides will not be washed away and to minimize non- stormwater discharge.

Building Repair, Remodeling, and Construction
• Do not dump any toxic substance or liquid waste on the pavement, the ground, or toward a storm drain.
■ Use ground or drop cloths underneath outdoor painting, scraping, and sandblasting work, and properly dispose of collected material daily.
• Use a ground cloth or oversized tub for activities such as paint mixing and tool cleaning. • Clean paint brushes and tools covered with water -based paints in sinks connected to sanitary sewers or in portable containers that can be dumped into a sanitary sewer drain.

Brushes and tools covered with non -water -based paints, finishes, or other materials must be cleaned in a manner that enables collection of used solvents (e.g., paint thinner, turpentine, etc.) for recycling or proper disposal.
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Building & Grounds Maintenance SC -41
• Use a storm drain cover, filter fabric, or similarly effective runoff control mechanism if dust, grit, wash water, or other pollutants may escape the work area and enter a catch basin. The containment device(s) must be in place at the beginning of the work day, and accumulated dirty runoff and solids must be collected and disposed of before removing the containment device(s) at the end of the work day.
• If you need to de -water an excavation site, you may need to filter the water before discharging to a catch basin or off -site. In which case you should direct the water through hay bales and filter fabric or use other sediment filters or traps. • Store toxic material under cover with secondary containment during precipitation events and when not in use. A cover would include tarps or other temporary cover material.

Mowing, Trimming, and Planting
• Dispose of leaves, sticks, or other collected vegetation as garbage, by composting or at a permitted landfill. Do not dispose of collected vegetation into waterways or storm drainage systems.
• Use mulch or other erosion control measures when soils are exposed. • Place temporarily stockpiled material away from watercourses and drain inlets, and berm or cover stockpiles to prevent material releases to the storm drain system. • Consider an alternative approach when bailing out muddy water; do not put it in the storm drain, pour over landscaped areas.
• Use hand or mechanical weeding where practical.

Fertilizer and Pesticide Management
• Follow all federal, state, and local laws and regulations governing the use, storage, and disposal of fertilizers and pesticides and training of applicators and pest control advisors. • Follow manufacturers' recommendations and label directions. Pesticides must never be applied if precipitation is occuring or predicted. Do not apply insecticides within ioo feet of surface waters such as lakes, ponds, wetlands, and streams. • Use less toxic pesticides that will do the job, whenever possible. Avoid use of copper -based pesticides if possible.
• Do not use pesticides if rain is expected.
• Do not mix or prepare pesticides for application near storm drains. • Use the minimum amount needed for the job.
• Calibrate fertilizer distributors to avoid excessive application. • Employ techniques to minimize off -target application (e.g. spray drift) of pesticides, including consideration of alternative application techniques.

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• Apply pesticides only when wind speeds are low.
• Work fertilizers into the soil rather than dumping or broadcasting them onto the surface. • Irrigate slowly to prevent runoff and then only as much as is needed. • Clean pavement and sidewalk if fertilizer is spilled on these surfaces before applying irrigation water.
• Dispose of empty pesticide containers according to the instructions on the container label. • Use up the pesticides. Rinse containers, and use rinse water as product. Dispose of unused pesticide as hazardous waste.
• Implement storage requirements for pesticide products with guidance from the local fire department and County Agricultural Commissioner. Provide secondary containment for pesticides.

Inspection
• Inspect irrigation system periodically to ensure that the right amount of water is being applied and that excessive runoff is not occurring. Minimize excess watering, and repair leaks in the irrigation system as soon as they are observed.

Training
• Educate and train employees on use of pesticides and in pesticide application techniques to prevent pollution.
• Train employees and contractors in proper techniques for spill containment and cleanup. • Be sure the frequency of training takes into account the complexity of the operations and the nature of the staff.

Spill Response and Prevention
• Refer to SC -ii, Spill Prevention, Control & Cleanup
• Keep your Spill Prevention Control and countermeasure (SPCC) plan up-to-date, and implement accordingly.
• Have spill cleanup materials readily available and in a known location. • Cleanup spills immediately and use dry methods if possible. • Properly dispose of spill cleanup material.

Other Considerations
• Alternative pest/weed controls may not be available, suitable, or effective in many cases. 4 of 5 California Stormwater BMP Handbook
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Building & Grounds Maintenance SC -41
Requirements
Costs
■ Overall costs should be low in comparison to other BMPs.

Maintenance
• Sweep paved areas regularly to collect loose particles, and wipe up spills with rags and other absorbent material immediately, do not hose down the area to a storm drain.

Supplemental Information
Further Detail of the BMP
Fire Sprinkler Line Flushing
Building fire sprinkler line flushing may be a source of non-stormwater runoff pollution. The water entering the system is usually potable water though in some areas it may be non -potable reclaimed wastewater. There are subsequent factors that may drastically reduce the quality of the water in such systems. Black iron pipe is usually used since it is cheaper than potable piping but it is subject to rusting and results in lower quality water. Initially the black iron pipe has an oil coating to protect it from rusting between manufacture and installation; this will contaminate the water from the first flush but not from subsequent flushes. Nitrates, poly- phosphates and other corrosion inhibitors, as well as fire suppressants and antifreeze may be added to the sprinkler water system. Water generally remains in the sprinkler system a long time, typically a year, between flushes and may accumulate iron, manganese, lead, copper, nickel and zinc. The water generally becomes anoxic and contains living and dead bacteria and breakdown products from chlorination. This may result in a significant BOD problem and the water often smells. Consequently dispose fire sprinkler line flush water into the sanitary sewer.

Do not allow discharge to storm drain or infiltration due to potential high levels of pollutants in fire sprinkler line water.

References and Resources
California's Nonpoint Source Program Plan http://www.swrcb.ca.gov/nps/index.html King County - ftp://dnr.metrokc.gov/wlr/dss/spcm/Chapter%2o3.PDF Orange County Stormwater Program
http://www.ocwatersheds.com/StormWater/swp_introduction.asp Mobile Cleaners Pilot Program: Final Report. 1997. Bay Area Stormwater Management Agencies Association (BASSMA) http://www.basmaa.org/
Pollution from Surface Cleaning Folder. 1996. Bay Area Stormwater Management Agencies Association (BASMAA) http://www.basmaa.org/
San Diego Stormwater Co-permittees Jurisdictional Urban Runoff Management Program (URMP) -
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Photo Credit: Geoff Brosseau
Spill Prevention, Control & Cleanup SC -11
Objectives
• Cover
• Contain
• Educate
• Reduce/Minimize
• Product Substitution
Description Targeted Constituents
Many activities that occur at an industrial or commercial site have the potential to cause accidental or illegal spills.

Preparation for accidental or illegal spills, with proper training and reporting systems implemented, can minimize the discharge of pollutants to the environment.

Spills and leaks are one of the largest contributors of stormwater pollutants. Spill prevention and control plans are applicable to any site at which hazardous materials are stored or used. An effective plan should have spill prevention and response procedures that identify potential spill areas, specify material handling procedures, describe spill response procedures, and provide spill clean-up equipment. The plan should take steps to identify and characterize potential spills, eliminate and reduce spill potential, respond to spills when they occur in an effort to prevent pollutants from entering the stormwater drainage system, and train personnel to prevent and control future spills.

Approach
Pollution Prevention
• Develop procedures to prevent/mitigate spills to storm drain systems. Develop and standardize reporting procedures,
containment, storage, and disposal activities, documentation, and follow-up procedures.
• Develop a Spill Prevention Control and Countermeasure (SPCC) Plan. The plan should include:

Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
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- Description of the facility, owner and address, activities and chemicals present - Facility map
- Notification and evacuation procedures
- Cleanup instructions
- Identification of responsible departments
- Identify key spill response personnel
• Recycle, reclaim, or reuse materials whenever possible. This will reduce the amount of process materials that are brought into the facility.

Suggested Protocols (including equipment needs)
Spill Prevention
• Develop procedures to prevent/mitigate spills to storm drain systems. Develop and standardize reporting procedures, containment, storage, and disposal activities, documentation, and follow-up procedures.
• If consistent illegal dumping is observed at the facility:
- Post "No Dumping" signs with a phone number for reporting illegal dumping and disposal. Signs should also indicate fines and penalties applicable for illegal dumping. - Landscaping and beautification efforts may also discourage illegal dumping. - Bright lighting and/or entrance barriers may also be needed to discourage illegal dumping.
• Store and contain liquid materials in such a manner that if the tank is ruptured, the contents will not discharge, flow, or be washed into the storm drainage system, surface waters, or groundwater.
• If the liquid is oil, gas, or other material that separates from and floats on water, install a spill control device (such as a tee section) in the catch basins that collects runoff from the storage tank area.
• Routine maintenance:
- Place drip pans or absorbent materials beneath all mounted taps, and at all potential drip and spill locations during filling and unloading of tanks. Any collected liquids or soiled absorbent materials must be reused/recycled or properly disposed. - Store and maintain appropriate spill cleanup materials in a location known to all near the tank storage area; and ensure that employees are familiar with the site's spill control plan and/or proper spill cleanup procedures.
- Sweep and clean the storage area monthly if it is paved, do not hose down the area to a storm drain.
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Spill Prevention, Control & Cleanup SC -11
- Check tanks (and any containment sumps) daily for leaks and spills. Replace tanks that are leaking, corroded, or otherwise deteriorating with tanks in good condition. Collect all spilled liquids and properly dispose of them.
■ Label all containers according to their contents (e.g., solvent, gasoline). • Label hazardous substances regarding the potential hazard (corrosive, radioactive, flammable, explosive, poisonous).
• Prominently display required labels on transported hazardous and toxic materials (per US DOT regulations).
• Identify key spill response personnel.

Spill Control and Cleanup Activities
■ Follow the Spill Prevention Control and Countermeasure Plan. • Clean up leaks and spills immediately.
• Place a stockpile of spill cleanup materials where it will be readily accessible (e.g., near storage and maintenance areas).
• On paved surfaces, clean up spills with as little water as possible. Use a rag for small spills, a damp mop for general cleanup, and absorbent material for larger spills. If the spilled material is hazardous, then the used cleanup materials are also hazardous and must be sent to a certified laundry (rags) or disposed of as hazardous waste. Physical methods for the cleanup of dry chemicals include the use of brooms, shovels, sweepers, or plows. • Never hose down or bury dry material spills. Sweep up the material and dispose of properly. ■ Chemical cleanups of material can be achieved with the use of adsorbents, gels, and foams.

Use adsorbent materials on small spills rather than hosing down the spill. Remove the adsorbent materials promptly and dispose of properly.
• For larger spills, a private spill cleanup company or Hazmat team may be necessary.

Reporting
• Report spills that pose an immediate threat to human health or the environment to the Regional Water Quality Control Board.
• Federal regulations require that any oil spill into a water body or onto an adjoining shoreline be reported to the National Response Center (NRC) at 800-424-8802 (24 hour). • Report spills to local agencies, such as the fire department; they can assist in cleanup. • Establish a system for tracking incidents. The system should be designed to identify the following:
- Types and quantities (in some cases) of wastes
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- Mode of dumping (abandoned containers, "midnight dumping" from moving vehicles, direct dumping of materials, accidents/spills)
- Responsible parties
Training
■ Educate employees about spill prevention and cleanup. ■ Well -trained employees can reduce human errors that lead to accidental releases or spills:
- The employee should have the tools and knowledge to immediately begin cleaning up a spill should one occur.
- Employees should be familiar with the Spill Prevention Control and Countermeasure Plan.
• Employees should be educated about aboveground storage tank requirements. Employees responsible for aboveground storage tanks and liquid transfers should be thoroughly familiar with the Spill Prevention Control and Countermeasure Man and the plan should be readily available.
• Train employees to recognize and report illegal dumping incidents.

Other Considerations (Limitations and Regulations)
• A Spill Prevention Control and Countermeasure Plan (SPCC) is required for facilities that are subject to the oil pollution regulations specified in Part 112 of Title 40 of the Code of Federal Regulations or if they have a storage capacity of io,000 gallons or more of petroleum. (Health and Safety Code 6.67)
• State regulations also exist for storage of hazardous materials (Health & Safety Code Chapter

6.95), including the preparation of area and business plans for emergency response to the releases or threatened releases.
• Consider requiring smaller secondary containment areas (less than 2OO sq. ft.) to be connected to the sanitary sewer, prohibiting any hard connections to the storm drain.

Requirements
Costs (including capital and operation & maintenance)
• Will vary depending on the size of the facility and the necessary controls. • Prevention of leaks and spills is inexpensive. Treatment and/or disposal of contaminated soil or water can be quite expensive.

Maintenance (including administrative and staffing)
• This BMP has no major administrative or staffing requirements. However, extra time is needed to properly handle and dispose of spills, which results in increased labor costs. 4 of 9 California Stormwater BMP Handbook
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Supplemental Information
Further Detail of the BMP
Reporting
Record keeping and internal reporting represent good operating practices because they can increase the efficiency of the facility and the effectiveness of BMPs. A good record keeping system helps the facility minimize incident recurrence, correctly respond with appropriate cleanup activities, and comply with legal requirements. A record keeping and reporting system should be set up for documenting spills, leaks, and other discharges, including discharges of hazardous substances in reportable quantities. Incident records describe the quality and quantity of non-stormwater discharges to the storm sewer. These records should contain the following information:
• Date and time of the incident
• Weather conditions
• Duration of the spill/leak/discharge
• Cause of the spill/leak/discharge
• Response procedures implemented
• Persons notified
• Environmental problems associated with the spill/leak/discharge Separate record keeping systems should be established to document housekeeping and preventive maintenance inspections, and training activities. All housekeeping and preventive maintenance inspections should be documented. Inspection documentation should contain the following information:
• The date and time the inspection was performed
■ Name of the inspector
• Items inspected
■ Problems noted
• Corrective action required
■ Date corrective action was taken
Other means to document and record inspection results are field notes, timed and dated photographs, videotapes, and drawings and maps.

Aboveground Tank Leak and Spill Control
Accidental releases of materials from aboveground liquid storage tanks present the potential for contaminating stormwater with many different pollutants. Materials spilled, leaked, or lost from January 2003
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tanks may accumulate in soils or on impervious surfaces and be carried away by stormwater runoff.

The most common causes of unintentional releases are:
• Installation problems
• Failure of piping systems (pipes, pumps, flanges, couplings, hoses, and valves) • External corrosion and structural failure
• Spills and overfills due to operator error
• Leaks during pumping of liquids or gases from truck or rail car to a storage tank or vice versa Storage of reactive, ignitable, or flammable liquids should comply with the Uniform Fire Code and the National Electric Code. Practices listed below should be employed to enhance the code requirements:
• Tanks should be placed in a designated area.
• Tanks located in areas where firearms are discharged should be encapsulated in concrete or the equivalent.
• Designated areas should be impervious and paved with Portland cement concrete, free of cracks and gaps, in order to contain leaks and spills.
• Liquid materials should be stored in UL approved double walled tanks or surrounded by a curb or dike to provide the volume to contain io percent of the volume of all of the containers or iio percent of the volume of the largest container, whichever is greater. The area inside the curb should slope to a drain.
• For used oil or dangerous waste, a dead-end sump should be installed in the drain. • All other liquids should be drained to the sanitary sewer if available. The drain must have a positive control such as a lock, valve, or plug to prevent release of contaminated liquids. • Accumulated stormwater in petroleum storage areas should be passed through an oil/water separator.

Maintenance is critical to preventing leaks and spills. Conduct routine inspections and:
• Check for external corrosion and structural failure.
• Check for spills and overfills due to operator error. • Check for failure of piping system (pipes, pumps, flanger, coupling, hoses, and valves). • Check for leaks or spills during pumping of liquids or gases from truck or rail car to a storage facility or vice versa.
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BEAUMONT
-C A L I F O R N I A
Staff Report
TO: City Council
FROM: Robert Vestal, Public Works Director
DATE: June 17, 2025
SUBJECT: Accept Public Improvements and Exonerate Maintenance Bond Description Maintenance bond exoneration for storm drain improvements associated with Tract Map No. 31462 PH 4A.

Background and Analysis:

The City requires all developers to provide construction security for public improvements consisting of, but not limited to, street improvements, sewer improvements, storm drain improvements, and survey monumentation. After the improvements are constructed, City staff verifies that no liens have been filed, that the improvements are completed in accordance with the project's conditions of approval, design standards, and City requirements, and that all punch list items have been addressed. Once verified, the City Council may exonerate the construction security and accept a one-year maintenance security.

During the one-year maintenance period, the developer maintains all associated improvements. After the one-year term has elapsed, the developer may petition the City Council to accept the improvements into the publicly maintained system and exonerate the maintenance security.

After the petition is received by the Public Works Department, City staff verifies that the previously constructed improvements have been maintained in accordance with City standards. Maintenance includes replacing defective materials, repairing defective craftsmanship, replacing missing components, repairing or replacing damaged finishes and surfaces, and repairing any other deficiencies.

The drainage facilities associated with this item discharge into the Sorenstam Water Quality Basin and the existing drainage course coincident with Oak Valley Parkway.

The Principal is requesting that the public improvements listed in Table No. 1 be accepted and respective maintenance bonds be exonerated.

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Beaumont City CouncilJune 17, 2025

Beaumont City Council
June 17, 2025