Sub‐ Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 100
1.91 1 1.36
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rainfall data for year 100
1.91 6 3.36
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rainfall data for year 100
1 1151
DA12ExSyn100yr24013
1.91 24 6.02
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ********
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 3) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)
86.0 97.2 1.91 1.000 0.055 0.943 0.052 Area‐averaged adjusted loss rate Fm (In/Hr) = 0.052
********* Area‐Averaged low loss rate fraction, Yb ********** Area Area SCS CN SCS CN S Pervious (Ac.) Fract (AMC2) (AMC3) Yield Fr
1.80 0.943 86.0 97.2 0.29 0.945
0.11 0.057 98.0 98.0 0.20 0.960 Area‐averaged catchment yield fraction, Y = 0.946
Area‐averaged low loss fraction, Yb = 0.054
User entry of time of concentration = 0.268 (hours)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Watershed area = 1.91(Ac.)
Catchment Lag time = 0.215 hours
Unit interval = 5.000 minutes
Unit interval percentage of lag time = 38.8247
Hydrograph baseflow = 0.00(CFS)
Average maximum watershed loss rate(Fm) = 0.052(In/Hr) Average low loss rate fraction (Yb) = 0.054 (decimal)
VALLEY UNDEVELOPED S‐Graph Selected
Computed peak 5‐minute rainfall = 0.503(In)
Computed peak 30‐minute rainfall = 1.031(In)
Specified peak 1‐hour rainfall = 1.360(In)
Computed peak 3‐hour rainfall = 2.368(In)
Specified peak 6‐hour rainfall = 3.360(In)
Specified peak 24‐hour rainfall = 6.020(In)
Rainfall depth area reduction factors:
Using a total area of 1.91(Ac.) (Ref: fig. E‐4)
5‐minute factor = 1.000 Adjusted rainfall = 0.503(In) 30‐minute factor = 1.000 Adjusted rainfall = 1.031(In) 1‐hour factor = 1.000 Adjusted rainfall = 1.360(In) 3‐hour factor = 1.000 Adjusted rainfall = 2.368(In) 6‐hour factor = 1.000 Adjusted rainfall = 3.360(In) 2 1152
DA12ExSyn100yr24013
24‐hour factor = 1.000 Adjusted rainfall = 6.020(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ U n i t H y d r o g r a p h
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval 'S' Graph Unit Hydrograph
Number Mean values ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ (K = 23.06 (CFS))
1 4.166 0.961
2 21.135 3.913
3 47.205 6.013
4 65.226 4.156
5 74.103 2.047
6 79.596 1.267
7 83.663 0.938
8 86.846 0.734
9 89.301 0.566
10 91.329 0.468
11 92.924 0.368
12 94.181 0.290
13 95.357 0.271
14 96.331 0.225
15 97.131 0.185
16 97.809 0.156
17 98.363 0.128
18 98.794 0.099
19 99.183 0.090
20 99.571 0.090
21 100.000 0.045
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Peak Unit Adjusted mass rainfall Unit rainfall
Number (In) (In)
1 0.5033 0.5033
2 0.6641 0.1608
3 0.7810 0.1169
4 0.8763 0.0953
5 0.9581 0.0818
6 1.0306 0.0725
7 1.0961 0.0655
8 1.1563 0.0601
9 1.2121 0.0558
10 1.2642 0.0522
11 1.3134 0.0491
12 1.3599 0.0465
13 1.4160 0.0561
14 1.4699 0.0540
3 1153
DA12ExSyn100yr24013
15 1.5220 0.0521
16 1.5724 0.0504
17 1.6213 0.0489
18 1.6688 0.0475
19 1.7150 0.0462
20 1.7600 0.0450
21 1.8038 0.0439
22 1.8467 0.0429
23 1.8886 0.0419
24 1.9296 0.0410
25 1.9698 0.0402
26 2.0092 0.0394
27 2.0479 0.0386
28 2.0858 0.0379
29 2.1231 0.0373
30 2.1597 0.0367
31 2.1958 0.0361
32 2.2313 0.0355
33 2.2662 0.0349
34 2.3006 0.0344
35 2.3345 0.0339
36 2.3680 0.0334
37 2.4010 0.0330
38 2.4335 0.0325
39 2.4656 0.0321
40 2.4973 0.0317
41 2.5287 0.0313
42 2.5596 0.0309
43 2.5902 0.0306
44 2.6204 0.0302
45 2.6503 0.0299
46 2.6799 0.0296
47 2.7091 0.0293
48 2.7381 0.0289
49 2.7667 0.0286
50 2.7951 0.0284
51 2.8232 0.0281
52 2.8510 0.0278
53 2.8785 0.0275
54 2.9058 0.0273
55 2.9329 0.0270
56 2.9597 0.0268
57 2.9862 0.0266
58 3.0125 0.0263
59 3.0387 0.0261
60 3.0645 0.0259
61 3.0902 0.0257
62 3.1157 0.0255
4 1154
DA12ExSyn100yr24013
63 3.1410 0.0253
64 3.1660 0.0251
65 3.1909 0.0249
66 3.2156 0.0247
67 3.2401 0.0245
68 3.2644 0.0243
69 3.2886 0.0241
70 3.3125 0.0240
71 3.3363 0.0238
72 3.3600 0.0236
73 3.3795 0.0196
74 3.3989 0.0194
75 3.4182 0.0192
76 3.4373 0.0191
77 3.4562 0.0190
78 3.4750 0.0188
79 3.4937 0.0187
80 3.5122 0.0185
81 3.5306 0.0184
82 3.5489 0.0183
83 3.5671 0.0181
84 3.5851 0.0180
85 3.6030 0.0179
86 3.6207 0.0178
87 3.6384 0.0177
88 3.6559 0.0175
89 3.6733 0.0174
90 3.6906 0.0173
91 3.7078 0.0172
92 3.7249 0.0171
93 3.7419 0.0170
94 3.7588 0.0169
95 3.7755 0.0168
96 3.7922 0.0167
97 3.8088 0.0166
98 3.8252 0.0165
99 3.8416 0.0164
100 3.8579 0.0163
101 3.8741 0.0162
102 3.8902 0.0161
103 3.9062 0.0160
104 3.9221 0.0159
105 3.9379 0.0158
106 3.9536 0.0157
107 3.9693 0.0156
108 3.9848 0.0156
109 4.0003 0.0155
110 4.0157 0.0154
5 1155
DA12ExSyn100yr24013
111 4.0310 0.0153
112 4.0463 0.0152
113 4.0614 0.0152
114 4.0765 0.0151
115 4.0915 0.0150
116 4.1064 0.0149
117 4.1213 0.0149
118 4.1361 0.0148
119 4.1508 0.0147
120 4.1654 0.0146
121 4.1800 0.0146
122 4.1945 0.0145
123 4.2089 0.0144
124 4.2233 0.0144
125 4.2376 0.0143
126 4.2518 0.0142
127 4.2659 0.0142
128 4.2800 0.0141
129 4.2941 0.0140
130 4.3081 0.0140
131 4.3220 0.0139
132 4.3358 0.0138
133 4.3496 0.0138
134 4.3633 0.0137
135 4.3770 0.0137
136 4.3906 0.0136
137 4.4042 0.0136
138 4.4176 0.0135
139 4.4311 0.0134
140 4.4445 0.0134
141 4.4578 0.0133
142 4.4711 0.0133
143 4.4843 0.0132
144 4.4974 0.0132
145 4.5106 0.0131
146 4.5236 0.0131
147 4.5366 0.0130
148 4.5496 0.0130
149 4.5625 0.0129
150 4.5753 0.0129
151 4.5882 0.0128
152 4.6009 0.0128
153 4.6136 0.0127
154 4.6263 0.0127
155 4.6389 0.0126
156 4.6515 0.0126
157 4.6640 0.0125
158 4.6764 0.0125
6 1156
DA12ExSyn100yr24013
159 4.6889 0.0124
160 4.7013 0.0124
161 4.7136 0.0123
162 4.7259 0.0123
163 4.7381 0.0122
164 4.7503 0.0122
165 4.7625 0.0122
166 4.7746 0.0121
167 4.7867 0.0121
168 4.7987 0.0120
169 4.8107 0.0120
170 4.8227 0.0120
171 4.8346 0.0119
172 4.8465 0.0119
173 4.8583 0.0118
174 4.8701 0.0118
175 4.8819 0.0118
176 4.8936 0.0117
177 4.9053 0.0117
178 4.9169 0.0116
179 4.9285 0.0116
180 4.9401 0.0116
181 4.9516 0.0115
182 4.9631 0.0115
183 4.9745 0.0115
184 4.9859 0.0114
185 4.9973 0.0114
186 5.0087 0.0113
187 5.0200 0.0113
188 5.0312 0.0113
189 5.0425 0.0112
190 5.0537 0.0112
191 5.0649 0.0112
192 5.0760 0.0111
193 5.0871 0.0111
194 5.0982 0.0111
195 5.1092 0.0110
196 5.1202 0.0110
197 5.1312 0.0110
198 5.1421 0.0109
199 5.1530 0.0109
200 5.1639 0.0109
201 5.1748 0.0108
202 5.1856 0.0108
203 5.1964 0.0108
204 5.2071 0.0108
205 5.2178 0.0107
206 5.2285 0.0107
7 1157
DA12ExSyn100yr24013
207 5.2392 0.0107
208 5.2498 0.0106
209 5.2604 0.0106
210 5.2710 0.0106
211 5.2815 0.0105
212 5.2921 0.0105
213 5.3025 0.0105
214 5.3130 0.0105
215 5.3234 0.0104
216 5.3338 0.0104
217 5.3442 0.0104
218 5.3546 0.0103
219 5.3649 0.0103
220 5.3752 0.0103
221 5.3854 0.0103
222 5.3957 0.0102
223 5.4059 0.0102
224 5.4161 0.0102
225 5.4262 0.0102
226 5.4363 0.0101
227 5.4465 0.0101
228 5.4565 0.0101
229 5.4666 0.0101
230 5.4766 0.0100
231 5.4866 0.0100
232 5.4966 0.0100
233 5.5066 0.0100
234 5.5165 0.0099
235 5.5264 0.0099
236 5.5363 0.0099
237 5.5461 0.0099
238 5.5560 0.0098
239 5.5658 0.0098
240 5.5755 0.0098
241 5.5853 0.0098
242 5.5950 0.0097
243 5.6048 0.0097
244 5.6145 0.0097
245 5.6241 0.0097
246 5.6338 0.0096
247 5.6434 0.0096
248 5.6530 0.0096
249 5.6626 0.0096
250 5.6721 0.0096
251 5.6817 0.0095
252 5.6912 0.0095
253 5.7007 0.0095
254 5.7101 0.0095
8 1158
DA12ExSyn100yr24013
255 5.7196 0.0094
256 5.7290 0.0094
257 5.7384 0.0094
258 5.7478 0.0094
259 5.7571 0.0094
260 5.7665 0.0093
261 5.7758 0.0093
262 5.7851 0.0093
263 5.7944 0.0093
264 5.8036 0.0093
265 5.8129 0.0092
266 5.8221 0.0092
267 5.8313 0.0092
268 5.8405 0.0092
269 5.8496 0.0092
270 5.8588 0.0091
271 5.8679 0.0091
272 5.8770 0.0091
273 5.8860 0.0091
274 5.8951 0.0091
275 5.9041 0.0090
276 5.9132 0.0090
277 5.9222 0.0090
278 5.9312 0.0090
279 5.9401 0.0090
280 5.9491 0.0089
281 5.9580 0.0089
282 5.9669 0.0089
283 5.9758 0.0089
284 5.9847 0.0089
285 5.9935 0.0089
286 6.0024 0.0088
287 6.0112 0.0088
288 6.0200 0.0088
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Unit Unit Unit Effective Period Rainfall Soil‐Loss Rainfall (number) (In) (In) (In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 1 0.0088 0.0005 0.0083 2 0.0088 0.0005 0.0083 3 0.0089 0.0005 0.0084 4 0.0089 0.0005 0.0084 5 0.0089 0.0005 0.0084 6 0.0089 0.0005 0.0084 7 0.0090 0.0005 0.0085 8 0.0090 0.0005 0.0085 9 0.0090 0.0005 0.0085 9 1159
DA12ExSyn100yr24013
10 0.0090 0.0005 0.0085 11 0.0091 0.0005 0.0086 12 0.0091 0.0005 0.0086 13 0.0091 0.0005 0.0086 14 0.0092 0.0005 0.0087 15 0.0092 0.0005 0.0087 16 0.0092 0.0005 0.0087 17 0.0093 0.0005 0.0088 18 0.0093 0.0005 0.0088 19 0.0093 0.0005 0.0088 20 0.0093 0.0005 0.0088 21 0.0094 0.0005 0.0089 22 0.0094 0.0005 0.0089 23 0.0094 0.0005 0.0089 24 0.0095 0.0005 0.0090 25 0.0095 0.0005 0.0090 26 0.0095 0.0005 0.0090 27 0.0096 0.0005 0.0091 28 0.0096 0.0005 0.0091 29 0.0096 0.0005 0.0091 30 0.0097 0.0005 0.0091 31 0.0097 0.0005 0.0092 32 0.0097 0.0005 0.0092 33 0.0098 0.0005 0.0093 34 0.0098 0.0005 0.0093 35 0.0099 0.0005 0.0093 36 0.0099 0.0005 0.0093 37 0.0099 0.0005 0.0094 38 0.0100 0.0005 0.0094 39 0.0100 0.0005 0.0095 40 0.0100 0.0005 0.0095 41 0.0101 0.0005 0.0095 42 0.0101 0.0005 0.0096 43 0.0102 0.0006 0.0096 44 0.0102 0.0006 0.0096 45 0.0102 0.0006 0.0097 46 0.0103 0.0006 0.0097 47 0.0103 0.0006 0.0098 48 0.0103 0.0006 0.0098 49 0.0104 0.0006 0.0098 50 0.0104 0.0006 0.0099 51 0.0105 0.0006 0.0099 52 0.0105 0.0006 0.0099 53 0.0106 0.0006 0.0100 54 0.0106 0.0006 0.0100 55 0.0107 0.0006 0.0101 56 0.0107 0.0006 0.0101 57 0.0108 0.0006 0.0102 10 1160
DA12ExSyn100yr24013
58 0.0108 0.0006 0.0102 59 0.0108 0.0006 0.0103 60 0.0109 0.0006 0.0103 61 0.0109 0.0006 0.0103 62 0.0110 0.0006 0.0104 63 0.0110 0.0006 0.0104 64 0.0111 0.0006 0.0105 65 0.0111 0.0006 0.0105 66 0.0112 0.0006 0.0106 67 0.0112 0.0006 0.0106 68 0.0113 0.0006 0.0107 69 0.0113 0.0006 0.0107 70 0.0114 0.0006 0.0108 71 0.0115 0.0006 0.0108 72 0.0115 0.0006 0.0109 73 0.0116 0.0006 0.0109 74 0.0116 0.0006 0.0110 75 0.0117 0.0006 0.0110 76 0.0117 0.0006 0.0111 77 0.0118 0.0006 0.0112 78 0.0118 0.0006 0.0112 79 0.0119 0.0006 0.0113 80 0.0120 0.0006 0.0113 81 0.0120 0.0007 0.0114 82 0.0121 0.0007 0.0114 83 0.0122 0.0007 0.0115 84 0.0122 0.0007 0.0115 85 0.0123 0.0007 0.0116 86 0.0123 0.0007 0.0117 87 0.0124 0.0007 0.0118 88 0.0125 0.0007 0.0118 89 0.0126 0.0007 0.0119 90 0.0126 0.0007 0.0119 91 0.0127 0.0007 0.0120 92 0.0128 0.0007 0.0121 93 0.0129 0.0007 0.0122 94 0.0129 0.0007 0.0122 95 0.0130 0.0007 0.0123 96 0.0131 0.0007 0.0123 97 0.0132 0.0007 0.0124 98 0.0132 0.0007 0.0125 99 0.0133 0.0007 0.0126 100 0.0134 0.0007 0.0127 101 0.0135 0.0007 0.0128 102 0.0136 0.0007 0.0128 103 0.0137 0.0007 0.0129 104 0.0137 0.0007 0.0130 105 0.0138 0.0008 0.0131 11 1161
DA12ExSyn100yr24013
106 0.0139 0.0008 0.0132 107 0.0140 0.0008 0.0133 108 0.0141 0.0008 0.0133 109 0.0142 0.0008 0.0135 110 0.0143 0.0008 0.0135 111 0.0144 0.0008 0.0136 112 0.0145 0.0008 0.0137 113 0.0146 0.0008 0.0138 114 0.0147 0.0008 0.0139 115 0.0149 0.0008 0.0140 116 0.0149 0.0008 0.0141 117 0.0151 0.0008 0.0143 118 0.0152 0.0008 0.0143 119 0.0153 0.0008 0.0145 120 0.0154 0.0008 0.0146 121 0.0156 0.0008 0.0147 122 0.0156 0.0009 0.0148 123 0.0158 0.0009 0.0150 124 0.0159 0.0009 0.0150 125 0.0161 0.0009 0.0152 126 0.0162 0.0009 0.0153 127 0.0164 0.0009 0.0155 128 0.0165 0.0009 0.0156 129 0.0167 0.0009 0.0158 130 0.0168 0.0009 0.0159 131 0.0170 0.0009 0.0161 132 0.0171 0.0009 0.0162 133 0.0173 0.0009 0.0164 134 0.0174 0.0009 0.0165 135 0.0177 0.0010 0.0167 136 0.0178 0.0010 0.0168 137 0.0180 0.0010 0.0170 138 0.0181 0.0010 0.0172 139 0.0184 0.0010 0.0174 140 0.0185 0.0010 0.0175 141 0.0188 0.0010 0.0178 142 0.0190 0.0010 0.0179 143 0.0192 0.0010 0.0182 144 0.0194 0.0011 0.0183 145 0.0236 0.0013 0.0224 146 0.0238 0.0013 0.0225 147 0.0241 0.0013 0.0228 148 0.0243 0.0013 0.0230 149 0.0247 0.0013 0.0233 150 0.0249 0.0014 0.0235 151 0.0253 0.0014 0.0239 152 0.0255 0.0014 0.0241 153 0.0259 0.0014 0.0245 12 1162
DA12ExSyn100yr24013
154 0.0261 0.0014 0.0247 155 0.0266 0.0014 0.0251 156 0.0268 0.0015 0.0253 157 0.0273 0.0015 0.0258 158 0.0275 0.0015 0.0260 159 0.0281 0.0015 0.0266 160 0.0284 0.0015 0.0268 161 0.0289 0.0016 0.0274 162 0.0293 0.0016 0.0277 163 0.0299 0.0016 0.0283 164 0.0302 0.0016 0.0286 165 0.0309 0.0017 0.0293 166 0.0313 0.0017 0.0296 167 0.0321 0.0017 0.0304 168 0.0325 0.0018 0.0308 169 0.0334 0.0018 0.0316 170 0.0339 0.0018 0.0321 171 0.0349 0.0019 0.0330 172 0.0355 0.0019 0.0336 173 0.0367 0.0020 0.0347 174 0.0373 0.0020 0.0353 175 0.0386 0.0021 0.0366 176 0.0394 0.0021 0.0373 177 0.0410 0.0022 0.0388 178 0.0419 0.0023 0.0396 179 0.0439 0.0024 0.0415 180 0.0450 0.0024 0.0425 181 0.0475 0.0026 0.0449 182 0.0489 0.0027 0.0462 183 0.0521 0.0028 0.0493 184 0.0540 0.0029 0.0510 185 0.0465 0.0025 0.0440 186 0.0491 0.0027 0.0465 187 0.0558 0.0030 0.0527 188 0.0601 0.0033 0.0569 189 0.0725 0.0039 0.0685 190 0.0818 0.0044 0.0775 191 0.1169 0.0044 0.1126 192 0.1608 0.0044 0.1565 193 0.5033 0.0044 0.4989 194 0.0953 0.0044 0.0909 195 0.0655 0.0036 0.0620 196 0.0522 0.0028 0.0493 197 0.0561 0.0030 0.0530 198 0.0504 0.0027 0.0477 199 0.0462 0.0025 0.0437 200 0.0429 0.0023 0.0405 201 0.0402 0.0022 0.0380 13 1163
DA12ExSyn100yr24013
202 0.0379 0.0021 0.0359 203 0.0361 0.0020 0.0341 204 0.0344 0.0019 0.0325 205 0.0330 0.0018 0.0312 206 0.0317 0.0017 0.0300 207 0.0306 0.0017 0.0289 208 0.0296 0.0016 0.0280 209 0.0286 0.0016 0.0271 210 0.0278 0.0015 0.0263 211 0.0270 0.0015 0.0256 212 0.0263 0.0014 0.0249 213 0.0257 0.0014 0.0243 214 0.0251 0.0014 0.0237 215 0.0245 0.0013 0.0232 216 0.0240 0.0013 0.0227 217 0.0196 0.0011 0.0185 218 0.0191 0.0010 0.0181 219 0.0187 0.0010 0.0177 220 0.0183 0.0010 0.0173 221 0.0179 0.0010 0.0169 222 0.0175 0.0010 0.0166 223 0.0172 0.0009 0.0163 224 0.0169 0.0009 0.0160 225 0.0166 0.0009 0.0157 226 0.0163 0.0009 0.0154 227 0.0160 0.0009 0.0151 228 0.0157 0.0009 0.0149 229 0.0155 0.0008 0.0146 230 0.0152 0.0008 0.0144 231 0.0150 0.0008 0.0142 232 0.0148 0.0008 0.0140 233 0.0146 0.0008 0.0138 234 0.0144 0.0008 0.0136 235 0.0142 0.0008 0.0134 236 0.0140 0.0008 0.0132 237 0.0138 0.0007 0.0130 238 0.0136 0.0007 0.0129 239 0.0134 0.0007 0.0127 240 0.0133 0.0007 0.0126 241 0.0131 0.0007 0.0124 242 0.0130 0.0007 0.0123 243 0.0128 0.0007 0.0121 244 0.0127 0.0007 0.0120 245 0.0125 0.0007 0.0118 246 0.0124 0.0007 0.0117 247 0.0122 0.0007 0.0116 248 0.0121 0.0007 0.0115 249 0.0120 0.0007 0.0113 14 1164
DA12ExSyn100yr24013
250 0.0119 0.0006 0.0112 251 0.0118 0.0006 0.0111 252 0.0116 0.0006 0.0110 253 0.0115 0.0006 0.0109 254 0.0114 0.0006 0.0108 255 0.0113 0.0006 0.0107 256 0.0112 0.0006 0.0106 257 0.0111 0.0006 0.0105 258 0.0110 0.0006 0.0104 259 0.0109 0.0006 0.0103 260 0.0108 0.0006 0.0102 261 0.0107 0.0006 0.0101 262 0.0106 0.0006 0.0101 263 0.0105 0.0006 0.0100 264 0.0105 0.0006 0.0099 265 0.0104 0.0006 0.0098 266 0.0103 0.0006 0.0097 267 0.0102 0.0006 0.0097 268 0.0101 0.0006 0.0096 269 0.0101 0.0005 0.0095 270 0.0100 0.0005 0.0094 271 0.0099 0.0005 0.0094 272 0.0098 0.0005 0.0093 273 0.0098 0.0005 0.0092 274 0.0097 0.0005 0.0092 275 0.0096 0.0005 0.0091 276 0.0096 0.0005 0.0090 277 0.0095 0.0005 0.0090 278 0.0094 0.0005 0.0089 279 0.0094 0.0005 0.0089 280 0.0093 0.0005 0.0088 281 0.0092 0.0005 0.0087 282 0.0092 0.0005 0.0087 283 0.0091 0.0005 0.0086 284 0.0091 0.0005 0.0086 285 0.0090 0.0005 0.0085 286 0.0089 0.0005 0.0085 287 0.0089 0.0005 0.0084 288 0.0088 0.0005 0.0084 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Total soil rain loss = 0.30(In)
Total effective rainfall = 5.72(In)
Peak flow rate in flood hydrograph = 4.64(CFS)
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 ‐ H O U R S T O R M
R u n o f f H y d r o g r a p h
15 1165
DA12ExSyn100yr24013
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 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 0.01 Q | | | | 0+10 0.0003 0.04 Q | | | | 0+15 0.0010 0.09 Q | | | | 0+20 0.0018 0.13 Q | | | | 0+25 0.0028 0.14 Q | | | | 0+30 0.0039 0.15 Q | | | | 0+35 0.0050 0.16 Q | | | | 0+40 0.0061 0.17 Q | | | | 0+45 0.0073 0.17 Q | | | | 0+50 0.0086 0.18 Q | | | | 0+55 0.0098 0.18 Q | | | | 1+ 0 0.0111 0.19 Q | | | | 1+ 5 0.0124 0.19 Q | | | | 1+10 0.0137 0.19 Q | | | | 1+15 0.0150 0.19 Q | | | | 1+20 0.0164 0.19 Q | | | | 1+25 0.0177 0.20 Q | | | | 1+30 0.0191 0.20 Q | | | | 1+35 0.0205 0.20 Q | | | | 1+40 0.0218 0.20 Q | | | | 1+45 0.0232 0.20 QV | | | | 1+50 0.0246 0.20 QV | | | | 1+55 0.0260 0.20 QV | | | | 2+ 0 0.0274 0.20 QV | | | | 2+ 5 0.0288 0.20 QV | | | | 2+10 0.0302 0.20 QV | | | | 2+15 0.0317 0.21 QV | | | | 2+20 0.0331 0.21 QV | | | | 2+25 0.0345 0.21 QV | | | | 2+30 0.0359 0.21 QV | | | | 2+35 0.0374 0.21 QV | | | | 2+40 0.0388 0.21 QV | | | | 2+45 0.0403 0.21 QV | | | | 2+50 0.0417 0.21 QV | | | | 2+55 0.0432 0.21 QV | | | | 3+ 0 0.0446 0.21 QV | | | | 3+ 5 0.0461 0.21 Q V | | | | 3+10 0.0476 0.21 Q V | | | | 3+15 0.0490 0.21 Q V | | | | 3+20 0.0505 0.22 Q V | | | | 3+25 0.0520 0.22 Q V | | | | 3+30 0.0535 0.22 Q V | | | | 16 1166
DA12ExSyn100yr24013
3+35 0.0550 0.22 Q V | | | | 3+40 0.0565 0.22 Q V | | | | 3+45 0.0580 0.22 Q V | | | | 3+50 0.0595 0.22 Q V | | | | 3+55 0.0611 0.22 Q V | | | | 4+ 0 0.0626 0.22 Q V | | | | 4+ 5 0.0641 0.22 Q V | | | | 4+10 0.0657 0.22 Q V | | | | 4+15 0.0672 0.22 Q V | | | | 4+20 0.0688 0.23 Q V | | | | 4+25 0.0703 0.23 Q V | | | | 4+30 0.0719 0.23 Q V | | | | 4+35 0.0735 0.23 Q V | | | | 4+40 0.0750 0.23 Q V | | | | 4+45 0.0766 0.23 Q V | | | | 4+50 0.0782 0.23 Q V | | | | 4+55 0.0798 0.23 Q V | | | | 5+ 0 0.0814 0.23 Q V | | | | 5+ 5 0.0830 0.23 Q V | | | | 5+10 0.0846 0.24 Q V | | | | 5+15 0.0863 0.24 Q V | | | | 5+20 0.0879 0.24 Q V | | | | 5+25 0.0895 0.24 Q V | | | | 5+30 0.0912 0.24 Q V | | | | 5+35 0.0928 0.24 Q V | | | | 5+40 0.0945 0.24 Q V | | | | 5+45 0.0962 0.24 Q V | | | | 5+50 0.0979 0.24 Q V | | | | 5+55 0.0995 0.24 Q V | | | | 6+ 0 0.1012 0.25 Q V | | | | 6+ 5 0.1029 0.25 Q V | | | | 6+10 0.1046 0.25 Q V | | | | 6+15 0.1064 0.25 Q V | | | | 6+20 0.1081 0.25 |Q V | | | | 6+25 0.1098 0.25 |Q V | | | | 6+30 0.1116 0.25 |Q V | | | | 6+35 0.1133 0.25 |Q V | | | | 6+40 0.1151 0.26 |Q V | | | | 6+45 0.1168 0.26 |Q V | | | | 6+50 0.1186 0.26 |Q V | | | | 6+55 0.1204 0.26 |Q V | | | | 7+ 0 0.1222 0.26 |Q V | | | | 7+ 5 0.1240 0.26 |Q V | | | | 7+10 0.1258 0.26 |Q V | | | | 7+15 0.1276 0.26 |Q V | | | | 7+20 0.1295 0.27 |Q V | | | | 7+25 0.1313 0.27 |Q V | | | | 7+30 0.1332 0.27 |Q V | | | | 17 1167
DA12ExSyn100yr24013
7+35 0.1350 0.27 |Q V | | | | 7+40 0.1369 0.27 |Q V | | | | 7+45 0.1388 0.27 |Q V | | | | 7+50 0.1407 0.28 |Q V | | | | 7+55 0.1426 0.28 |Q V | | | | 8+ 0 0.1445 0.28 |Q V | | | | 8+ 5 0.1464 0.28 |Q V | | | | 8+10 0.1484 0.28 |Q V | | | | 8+15 0.1503 0.28 |Q V | | | | 8+20 0.1523 0.28 |Q V | | | | 8+25 0.1543 0.29 |Q V | | | | 8+30 0.1562 0.29 |Q V | | | | 8+35 0.1582 0.29 |Q V | | | | 8+40 0.1602 0.29 |Q V | | | | 8+45 0.1623 0.29 |Q V | | | | 8+50 0.1643 0.30 |Q V | | | | 8+55 0.1664 0.30 |Q V | | | | 9+ 0 0.1684 0.30 |Q V | | | | 9+ 5 0.1705 0.30 |Q V | | | | 9+10 0.1726 0.30 |Q V | | | | 9+15 0.1747 0.31 |Q V | | | | 9+20 0.1768 0.31 |Q V | | | | 9+25 0.1789 0.31 |Q V | | | | 9+30 0.1811 0.31 |Q V | | | | 9+35 0.1833 0.31 |Q V | | | | 9+40 0.1854 0.32 |Q V | | | | 9+45 0.1876 0.32 |Q V | | | | 9+50 0.1898 0.32 |Q V | | | | 9+55 0.1921 0.32 |Q V | | | | 10+ 0 0.1943 0.33 |Q V | | | | 10+ 5 0.1966 0.33 |Q V | | | | 10+10 0.1989 0.33 |Q V | | | | 10+15 0.2012 0.33 |Q V | | | | 10+20 0.2035 0.34 |Q V | | | | 10+25 0.2058 0.34 |Q V| | | | 10+30 0.2082 0.34 |Q V| | | | 10+35 0.2105 0.34 |Q V| | | | 10+40 0.2129 0.35 |Q V| | | | 10+45 0.2153 0.35 |Q V| | | | 10+50 0.2178 0.35 |Q V| | | | 10+55 0.2202 0.36 |Q V| | | | 11+ 0 0.2227 0.36 |Q V| | | | 11+ 5 0.2252 0.36 |Q V| | | | 11+10 0.2277 0.37 |Q V | | | 11+15 0.2303 0.37 |Q V | | | 11+20 0.2328 0.37 |Q V | | | 11+25 0.2354 0.38 |Q V | | | 11+30 0.2381 0.38 |Q V | | | 18 1168
DA12ExSyn100yr24013
11+35 0.2407 0.38 |Q V | | | 11+40 0.2434 0.39 |Q V | | | 11+45 0.2461 0.39 |Q V | | | 11+50 0.2488 0.40 |Q V | | | 11+55 0.2516 0.40 |Q |V | | | 12+ 0 0.2544 0.41 |Q |V | | | 12+ 5 0.2572 0.41 |Q |V | | | 12+10 0.2602 0.43 |Q |V | | | 12+15 0.2634 0.46 |Q |V | | | 12+20 0.2667 0.48 |Q |V | | | 12+25 0.2701 0.49 |Q |V | | | 12+30 0.2736 0.50 | Q | V | | | 12+35 0.2771 0.51 | Q | V | | | 12+40 0.2807 0.52 | Q | V | | | 12+45 0.2843 0.53 | Q | V | | | 12+50 0.2880 0.54 | Q | V | | | 12+55 0.2918 0.55 | Q | V | | | 13+ 0 0.2956 0.55 | Q | V | | | 13+ 5 0.2995 0.56 | Q | V | | | 13+10 0.3034 0.57 | Q | V | | | 13+15 0.3074 0.58 | Q | V | | | 13+20 0.3114 0.59 | Q | V | | | 13+25 0.3155 0.59 | Q | V | | | 13+30 0.3196 0.60 | Q | V | | | 13+35 0.3239 0.61 | Q | V | | | 13+40 0.3281 0.62 | Q | V | | | 13+45 0.3325 0.63 | Q | V | | | 13+50 0.3369 0.64 | Q | V | | | 13+55 0.3414 0.65 | Q | V | | | 14+ 0 0.3460 0.66 | Q | V | | | 14+ 5 0.3507 0.68 | Q | V | | | 14+10 0.3554 0.69 | Q | V | | | 14+15 0.3603 0.70 | Q | V | | | 14+20 0.3652 0.72 | Q | V | | | 14+25 0.3702 0.73 | Q | V | | | 14+30 0.3754 0.75 | Q | V | | | 14+35 0.3807 0.77 | Q | V | | | 14+40 0.3861 0.79 | Q | V | | | 14+45 0.3916 0.81 | Q | V | | | 14+50 0.3973 0.83 | Q | V | | | 14+55 0.4032 0.85 | Q | V | | | 15+ 0 0.4092 0.88 | Q | V | | | 15+ 5 0.4155 0.91 | Q | V | | | 15+10 0.4219 0.94 | Q | V | | | 15+15 0.4286 0.97 | Q | V | | | 15+20 0.4356 1.01 | Q | V| | | 15+25 0.4428 1.05 | Q | V| | | 15+30 0.4501 1.06 | Q | V| | | 19 1169
DA12ExSyn100yr24013
15+35 0.4574 1.05 | Q | V | | 15+40 0.4648 1.08 | Q | V | | 15+45 0.4728 1.15 | Q | V | | 15+50 0.4814 1.26 | Q | |V | | 15+55 0.4913 1.43 | Q | |V | | 16+ 0 0.5032 1.73 | Q | | V | | 16+ 5 0.5206 2.52 | Q | V | | 16+10 0.5476 3.92 | | Q | V | | 16+15 0.5795 4.64 | | Q | V | | 16+20 0.6046 3.64 | | Q | V | | 16+25 0.6221 2.53 | Q | V | | 16+30 0.6360 2.03 | Q | | V | | 16+35 0.6483 1.78 | Q | | V | | 16+40 0.6593 1.60 | Q | | V| | 16+45 0.6692 1.44 | Q | | V| | 16+50 0.6783 1.32 | Q | | V| | 16+55 0.6866 1.20 | Q | | V | 17+ 0 0.6943 1.11 | Q | | V | 17+ 5 0.7015 1.05 | Q | | V | 17+10 0.7082 0.98 | Q | | |V | 17+15 0.7145 0.92 | Q | | |V | 17+20 0.7205 0.87 | Q | | |V | 17+25 0.7261 0.82 | Q | | | V | 17+30 0.7315 0.77 | Q | | | V | 17+35 0.7366 0.74 | Q | | | V | 17+40 0.7414 0.71 | Q | | | V | 17+45 0.7460 0.66 | Q | | | V | 17+50 0.7503 0.62 | Q | | | V | 17+55 0.7544 0.60 | Q | | | V | 18+ 0 0.7584 0.58 | Q | | | V | 18+ 5 0.7623 0.56 | Q | | | V | 18+10 0.7660 0.53 | Q | | | V | 18+15 0.7694 0.50 |Q | | | V | 18+20 0.7727 0.47 |Q | | | V | 18+25 0.7758 0.45 |Q | | | V | 18+30 0.7788 0.44 |Q | | | V | 18+35 0.7817 0.42 |Q | | | V | 18+40 0.7846 0.41 |Q | | | V | 18+45 0.7873 0.40 |Q | | | V | 18+50 0.7900 0.39 |Q | | | V | 18+55 0.7926 0.38 |Q | | | V | 19+ 0 0.7952 0.37 |Q | | | V | 19+ 5 0.7977 0.37 |Q | | | V | 19+10 0.8002 0.36 |Q | | | V | 19+15 0.8026 0.35 |Q | | | V | 19+20 0.8050 0.35 |Q | | | V | 19+25 0.8073 0.34 |Q | | | V | 19+30 0.8096 0.33 |Q | | | V | 20 1170
DA12ExSyn100yr24013
19+35 0.8119 0.33 |Q | | | V | 19+40 0.8141 0.32 |Q | | | V | 19+45 0.8163 0.32 |Q | | | V | 19+50 0.8184 0.31 |Q | | | V | 19+55 0.8206 0.31 |Q | | | V | 20+ 0 0.8227 0.30 |Q | | | V | 20+ 5 0.8247 0.30 |Q | | | V | 20+10 0.8268 0.30 |Q | | | V | 20+15 0.8288 0.29 |Q | | | V | 20+20 0.8308 0.29 |Q | | | V | 20+25 0.8328 0.29 |Q | | | V | 20+30 0.8347 0.28 |Q | | | V | 20+35 0.8366 0.28 |Q | | | V | 20+40 0.8385 0.28 |Q | | | V | 20+45 0.8404 0.27 |Q | | | V | 20+50 0.8423 0.27 |Q | | | V | 20+55 0.8441 0.27 |Q | | | V | 21+ 0 0.8459 0.26 |Q | | | V | 21+ 5 0.8477 0.26 |Q | | | V | 21+10 0.8495 0.26 |Q | | | V | 21+15 0.8512 0.26 |Q | | | V | 21+20 0.8530 0.25 |Q | | | V | 21+25 0.8547 0.25 |Q | | | V | 21+30 0.8564 0.25 Q | | | V | 21+35 0.8581 0.25 Q | | | V | 21+40 0.8598 0.24 Q | | | V | 21+45 0.8615 0.24 Q | | | V | 21+50 0.8631 0.24 Q | | | V | 21+55 0.8648 0.24 Q | | | V | 22+ 0 0.8664 0.24 Q | | | V | 22+ 5 0.8680 0.23 Q | | | V | 22+10 0.8696 0.23 Q | | | V | 22+15 0.8712 0.23 Q | | | V | 22+20 0.8727 0.23 Q | | | V | 22+25 0.8743 0.23 Q | | | V | 22+30 0.8758 0.22 Q | | | V | 22+35 0.8773 0.22 Q | | | V | 22+40 0.8789 0.22 Q | | | V | 22+45 0.8804 0.22 Q | | | V | 22+50 0.8819 0.22 Q | | | V | 22+55 0.8834 0.22 Q | | | V | 23+ 0 0.8848 0.21 Q | | | V| 23+ 5 0.8863 0.21 Q | | | V| 23+10 0.8877 0.21 Q | | | V| 23+15 0.8892 0.21 Q | | | V| 23+20 0.8906 0.21 Q | | | V| 23+25 0.8920 0.21 Q | | | V| 23+30 0.8934 0.21 Q | | | V| 21 1171
DA12ExSyn100yr24013
23+35 0.8948 0.20 Q | | | V| 23+40 0.8962 0.20 Q | | | V| 23+45 0.8976 0.20 Q | | | V| 23+50 0.8990 0.20 Q | | | V| 23+55 0.9004 0.20 Q | | | V| 24+ 0 0.9017 0.20 Q | | | V| 24+ 5 0.9030 0.19 Q | | | V| 24+10 0.9041 0.15 Q | | | V| 24+15 0.9048 0.10 Q | | | V| 24+20 0.9053 0.07 Q | | | V| 24+25 0.9056 0.05 Q | | | V| 24+30 0.9059 0.04 Q | | | V| 24+35 0.9061 0.03 Q | | | V| 24+40 0.9063 0.03 Q | | | V| 24+45 0.9064 0.02 Q | | | V| 24+50 0.9065 0.02 Q | | | V| 24+55 0.9066 0.01 Q | | | V| 25+ 0 0.9067 0.01 Q | | | V| 25+ 5 0.9068 0.01 Q | | | V| 25+10 0.9068 0.01 Q | | | V| 25+15 0.9068 0.01 Q | | | V| 25+20 0.9069 0.00 Q | | | V| 25+25 0.9069 0.00 Q | | | V| 25+30 0.9069 0.00 Q | | | V| 25+35 0.9069 0.00 Q | | | V| 25+40 0.9069 0.00 Q | | | V| ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 22 1172
DA1PrSyn10yr24013
U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2018, Version 9.0 Study date 10/06/25
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ San Bernardino County Synthetic Unit Hydrology Method
Manual date ‐ August 1986
Program License Serial Number 6474
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Commercial Development
Post‐developed DA1, 10‐YR
SEC Riverside Drive and Ontario (Champion) Avenue,
Ontario CA 91761
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Storm Event Year = 10
Antecedent Moisture Condition = 2
English (in‐lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
Area averaged rainfall intensity isohyetal data:
Sub‐ Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10
4.34 1 0.90
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rainfall data for year 10
4.34 6 2.28
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rainfall data for year 10
1 1173
DA1PrSyn10yr24013
4.34 24 4.01
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ********
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 2) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)
86.0 86.0 4.34 1.000 0.265 0.108 0.029 Area‐averaged adjusted loss rate Fm (In/Hr) = 0.029
********* Area‐Averaged low loss rate fraction, Yb ********** Area Area SCS CN SCS CN S Pervious (Ac.) Fract (AMC2) (AMC2) Yield Fr
0.47 0.108 86.0 86.0 1.63 0.637
3.87 0.892 98.0 98.0 0.20 0.941 Area‐averaged catchment yield fraction, Y = 0.908
Area‐averaged low loss fraction, Yb = 0.092
User entry of time of concentration = 0.090 (hours)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Watershed area = 4.34(Ac.)
Catchment Lag time = 0.072 hours
Unit interval = 5.000 minutes
Unit interval percentage of lag time = 115.8695
Hydrograph baseflow = 0.00(CFS)
Average maximum watershed loss rate(Fm) = 0.029(In/Hr) Average low loss rate fraction (Yb) = 0.092 (decimal)
VALLEY DEVELOPED S‐Graph Selected
Computed peak 5‐minute rainfall = 0.332(In)
Computed peak 30‐minute rainfall = 0.681(In)
Specified peak 1‐hour rainfall = 0.898(In)
Computed peak 3‐hour rainfall = 1.630(In)
Specified peak 6‐hour rainfall = 2.280(In)
Specified peak 24‐hour rainfall = 4.010(In)
Note: user specified rainfall values used.
Rainfall depth area reduction factors:
Using a total area of 4.34(Ac.) (Ref: fig. E‐4)
5‐minute factor = 1.000 Adjusted rainfall = 0.332(In) 30‐minute factor = 1.000 Adjusted rainfall = 0.680(In) 1‐hour factor = 1.000 Adjusted rainfall = 0.898(In) 3‐hour factor = 1.000 Adjusted rainfall = 1.630(In) 2 1174
DA1PrSyn10yr24013
6‐hour factor = 1.000 Adjusted rainfall = 2.280(In) 24‐hour factor = 1.000 Adjusted rainfall = 4.010(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ U n i t H y d r o g r a p h
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval 'S' Graph Unit Hydrograph
Number Mean values ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ (K = 52.45 (CFS))
1 22.589 11.848
2 87.148 33.861
3 99.001 6.217
4 100.000 0.524
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Peak Unit Adjusted mass rainfall Unit rainfall
Number (In) (In)
1 0.3323 0.3323
2 0.4385 0.1062
3 0.5157 0.0772
4 0.5785 0.0629
5 0.6326 0.0540
6 0.6804 0.0479
7 0.7237 0.0433
8 0.7634 0.0397
9 0.8002 0.0368
10 0.8347 0.0344
11 0.8671 0.0324
12 0.8978 0.0307
13 0.9377 0.0399
14 0.9762 0.0385
15 1.0134 0.0373
16 1.0496 0.0361
17 1.0847 0.0351
18 1.1189 0.0342
19 1.1522 0.0333
20 1.1847 0.0325
21 1.2165 0.0318
22 1.2476 0.0311
23 1.2781 0.0305
24 1.3080 0.0299
25 1.3373 0.0293
26 1.3660 0.0288
27 1.3943 0.0283
28 1.4221 0.0278
29 1.4495 0.0273
30 1.4764 0.0269
3 1175
DA1PrSyn10yr24013
31 1.5029 0.0265
32 1.5290 0.0261
33 1.5548 0.0258
34 1.5802 0.0254
35 1.6052 0.0251
36 1.6300 0.0247
37 1.6517 0.0218
38 1.6732 0.0215
39 1.6944 0.0212
40 1.7153 0.0209
41 1.7359 0.0206
42 1.7563 0.0204
43 1.7764 0.0201
44 1.7963 0.0199
45 1.8159 0.0197
46 1.8354 0.0194
47 1.8546 0.0192
48 1.8736 0.0190
49 1.8924 0.0188
50 1.9110 0.0186
51 1.9294 0.0184
52 1.9476 0.0182
53 1.9656 0.0180
54 1.9835 0.0179
55 2.0012 0.0177
56 2.0188 0.0175
57 2.0361 0.0174
58 2.0533 0.0172
59 2.0704 0.0171
60 2.0873 0.0169
61 2.1041 0.0168
62 2.1207 0.0166
63 2.1372 0.0165
64 2.1536 0.0164
65 2.1698 0.0162
66 2.1859 0.0161
67 2.2019 0.0160
68 2.2177 0.0159
69 2.2335 0.0157
70 2.2491 0.0156
71 2.2646 0.0155
72 2.2800 0.0154
73 2.2928 0.0128
74 2.3056 0.0127
75 2.3182 0.0126
76 2.3307 0.0125
77 2.3432 0.0124
78 2.3555 0.0123
4 1176
DA1PrSyn10yr24013
79 2.3678 0.0123
80 2.3799 0.0122
81 2.3920 0.0121
82 2.4040 0.0120
83 2.4159 0.0119
84 2.4277 0.0118
85 2.4394 0.0117
86 2.4511 0.0116
87 2.4627 0.0116
88 2.4741 0.0115
89 2.4856 0.0114
90 2.4969 0.0113
91 2.5082 0.0113
92 2.5193 0.0112
93 2.5305 0.0111
94 2.5415 0.0110
95 2.5525 0.0110
96 2.5634 0.0109
97 2.5742 0.0108
98 2.5850 0.0108
99 2.5957 0.0107
100 2.6064 0.0106
101 2.6170 0.0106
102 2.6275 0.0105
103 2.6379 0.0105
104 2.6483 0.0104
105 2.6587 0.0103
106 2.6690 0.0103
107 2.6792 0.0102
108 2.6894 0.0102
109 2.6995 0.0101
110 2.7095 0.0101
111 2.7195 0.0100
112 2.7295 0.0100
113 2.7394 0.0099
114 2.7492 0.0098
115 2.7590 0.0098
116 2.7688 0.0097
117 2.7785 0.0097
118 2.7881 0.0096
119 2.7977 0.0096
120 2.8073 0.0096
121 2.8168 0.0095
122 2.8262 0.0095
123 2.8357 0.0094
124 2.8450 0.0094
125 2.8543 0.0093
126 2.8636 0.0093
5 1177
DA1PrSyn10yr24013
127 2.8729 0.0092
128 2.8821 0.0092
129 2.8912 0.0091
130 2.9003 0.0091
131 2.9094 0.0091
132 2.9184 0.0090
133 2.9274 0.0090
134 2.9363 0.0089
135 2.9452 0.0089
136 2.9541 0.0089
137 2.9629 0.0088
138 2.9717 0.0088
139 2.9805 0.0088
140 2.9892 0.0087
141 2.9979 0.0087
142 3.0065 0.0086
143 3.0151 0.0086
144 3.0237 0.0086
145 3.0322 0.0085
146 3.0407 0.0085
147 3.0492 0.0085
148 3.0576 0.0084
149 3.0660 0.0084
150 3.0744 0.0084
151 3.0827 0.0083
152 3.0910 0.0083
153 3.0993 0.0083
154 3.1075 0.0082
155 3.1157 0.0082
156 3.1239 0.0082
157 3.1320 0.0081
158 3.1401 0.0081
159 3.1482 0.0081
160 3.1563 0.0080
161 3.1643 0.0080
162 3.1723 0.0080
163 3.1802 0.0080
164 3.1882 0.0079
165 3.1961 0.0079
166 3.2039 0.0079
167 3.2118 0.0078
168 3.2196 0.0078
169 3.2274 0.0078
170 3.2352 0.0078
171 3.2429 0.0077
172 3.2506 0.0077
173 3.2583 0.0077
174 3.2659 0.0077
6 1178
DA1PrSyn10yr24013
175 3.2736 0.0076
176 3.2812 0.0076
177 3.2888 0.0076
178 3.2963 0.0076
179 3.3039 0.0075
180 3.3114 0.0075
181 3.3188 0.0075
182 3.3263 0.0075
183 3.3337 0.0074
184 3.3411 0.0074
185 3.3485 0.0074
186 3.3559 0.0074
187 3.3632 0.0073
188 3.3705 0.0073
189 3.3778 0.0073
190 3.3851 0.0073
191 3.3923 0.0072
192 3.3996 0.0072
193 3.4068 0.0072
194 3.4139 0.0072
195 3.4211 0.0072
196 3.4282 0.0071
197 3.4353 0.0071
198 3.4424 0.0071
199 3.4495 0.0071
200 3.4565 0.0070
201 3.4636 0.0070
202 3.4706 0.0070
203 3.4776 0.0070
204 3.4845 0.0070
205 3.4915 0.0069
206 3.4984 0.0069
207 3.5053 0.0069
208 3.5122 0.0069
209 3.5191 0.0069
210 3.5259 0.0068
211 3.5328 0.0068
212 3.5396 0.0068
213 3.5464 0.0068
214 3.5531 0.0068
215 3.5599 0.0068
216 3.5666 0.0067
217 3.5733 0.0067
218 3.5800 0.0067
219 3.5867 0.0067
220 3.5934 0.0067
221 3.6000 0.0066
222 3.6066 0.0066
7 1179
DA1PrSyn10yr24013
223 3.6132 0.0066
224 3.6198 0.0066
225 3.6264 0.0066
226 3.6330 0.0066
227 3.6395 0.0065
228 3.6460 0.0065
229 3.6525 0.0065
230 3.6590 0.0065
231 3.6655 0.0065
232 3.6719 0.0065
233 3.6784 0.0064
234 3.6848 0.0064
235 3.6912 0.0064
236 3.6976 0.0064
237 3.7040 0.0064
238 3.7103 0.0064
239 3.7167 0.0063
240 3.7230 0.0063
241 3.7293 0.0063
242 3.7356 0.0063
243 3.7419 0.0063
244 3.7481 0.0063
245 3.7544 0.0062
246 3.7606 0.0062
247 3.7668 0.0062
248 3.7730 0.0062
249 3.7792 0.0062
250 3.7854 0.0062
251 3.7916 0.0062
252 3.7977 0.0061
253 3.8038 0.0061
254 3.8100 0.0061
255 3.8161 0.0061
256 3.8222 0.0061
257 3.8282 0.0061
258 3.8343 0.0061
259 3.8403 0.0060
260 3.8464 0.0060
261 3.8524 0.0060
262 3.8584 0.0060
263 3.8644 0.0060
264 3.8704 0.0060
265 3.8763 0.0060
266 3.8823 0.0060
267 3.8882 0.0059
268 3.8941 0.0059
269 3.9000 0.0059
270 3.9059 0.0059
8 1180
DA1PrSyn10yr24013
271 3.9118 0.0059
272 3.9177 0.0059
273 3.9236 0.0059
274 3.9294 0.0058
275 3.9352 0.0058
276 3.9411 0.0058
277 3.9469 0.0058
278 3.9527 0.0058
279 3.9585 0.0058
280 3.9642 0.0058
281 3.9700 0.0058
282 3.9757 0.0057
283 3.9815 0.0057
284 3.9872 0.0057
285 3.9929 0.0057
286 3.9986 0.0057
287 4.0043 0.0057
288 4.0100 0.0057
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Unit Unit Unit Effective Period Rainfall Soil‐Loss Rainfall (number) (In) (In) (In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 1 0.0057 0.0005 0.0052 2 0.0057 0.0005 0.0052 3 0.0057 0.0005 0.0052 4 0.0057 0.0005 0.0052 5 0.0057 0.0005 0.0052 6 0.0058 0.0005 0.0052 7 0.0058 0.0005 0.0053 8 0.0058 0.0005 0.0053 9 0.0058 0.0005 0.0053 10 0.0058 0.0005 0.0053 11 0.0059 0.0005 0.0053 12 0.0059 0.0005 0.0053 13 0.0059 0.0005 0.0054 14 0.0059 0.0005 0.0054 15 0.0059 0.0005 0.0054 16 0.0060 0.0005 0.0054 17 0.0060 0.0005 0.0054 18 0.0060 0.0005 0.0054 19 0.0060 0.0006 0.0055 20 0.0060 0.0006 0.0055 21 0.0061 0.0006 0.0055 22 0.0061 0.0006 0.0055 23 0.0061 0.0006 0.0055 24 0.0061 0.0006 0.0056 25 0.0061 0.0006 0.0056 9 1181
DA1PrSyn10yr24013
26 0.0062 0.0006 0.0056 27 0.0062 0.0006 0.0056 28 0.0062 0.0006 0.0056 29 0.0062 0.0006 0.0057 30 0.0062 0.0006 0.0057 31 0.0063 0.0006 0.0057 32 0.0063 0.0006 0.0057 33 0.0063 0.0006 0.0057 34 0.0063 0.0006 0.0058 35 0.0064 0.0006 0.0058 36 0.0064 0.0006 0.0058 37 0.0064 0.0006 0.0058 38 0.0064 0.0006 0.0058 39 0.0065 0.0006 0.0059 40 0.0065 0.0006 0.0059 41 0.0065 0.0006 0.0059 42 0.0065 0.0006 0.0059 43 0.0066 0.0006 0.0060 44 0.0066 0.0006 0.0060 45 0.0066 0.0006 0.0060 46 0.0066 0.0006 0.0060 47 0.0067 0.0006 0.0061 48 0.0067 0.0006 0.0061 49 0.0067 0.0006 0.0061 50 0.0068 0.0006 0.0061 51 0.0068 0.0006 0.0062 52 0.0068 0.0006 0.0062 53 0.0068 0.0006 0.0062 54 0.0069 0.0006 0.0062 55 0.0069 0.0006 0.0063 56 0.0069 0.0006 0.0063 57 0.0070 0.0006 0.0063 58 0.0070 0.0006 0.0063 59 0.0070 0.0006 0.0064 60 0.0070 0.0006 0.0064 61 0.0071 0.0006 0.0064 62 0.0071 0.0007 0.0065 63 0.0072 0.0007 0.0065 64 0.0072 0.0007 0.0065 65 0.0072 0.0007 0.0066 66 0.0072 0.0007 0.0066 67 0.0073 0.0007 0.0066 68 0.0073 0.0007 0.0066 69 0.0074 0.0007 0.0067 70 0.0074 0.0007 0.0067 71 0.0074 0.0007 0.0068 72 0.0075 0.0007 0.0068 73 0.0075 0.0007 0.0068 10 1182
DA1PrSyn10yr24013
74 0.0075 0.0007 0.0068 75 0.0076 0.0007 0.0069 76 0.0076 0.0007 0.0069 77 0.0077 0.0007 0.0070 78 0.0077 0.0007 0.0070 79 0.0077 0.0007 0.0070 80 0.0078 0.0007 0.0071 81 0.0078 0.0007 0.0071 82 0.0078 0.0007 0.0071 83 0.0079 0.0007 0.0072 84 0.0079 0.0007 0.0072 85 0.0080 0.0007 0.0073 86 0.0080 0.0007 0.0073 87 0.0081 0.0007 0.0073 88 0.0081 0.0007 0.0074 89 0.0082 0.0007 0.0074 90 0.0082 0.0008 0.0075 91 0.0083 0.0008 0.0075 92 0.0083 0.0008 0.0075 93 0.0084 0.0008 0.0076 94 0.0084 0.0008 0.0076 95 0.0085 0.0008 0.0077 96 0.0085 0.0008 0.0077 97 0.0086 0.0008 0.0078 98 0.0086 0.0008 0.0078 99 0.0087 0.0008 0.0079 100 0.0087 0.0008 0.0079 101 0.0088 0.0008 0.0080 102 0.0088 0.0008 0.0080 103 0.0089 0.0008 0.0081 104 0.0089 0.0008 0.0081 105 0.0090 0.0008 0.0082 106 0.0091 0.0008 0.0082 107 0.0091 0.0008 0.0083 108 0.0092 0.0008 0.0084 109 0.0093 0.0008 0.0084 110 0.0093 0.0009 0.0085 111 0.0094 0.0009 0.0086 112 0.0095 0.0009 0.0086 113 0.0096 0.0009 0.0087 114 0.0096 0.0009 0.0087 115 0.0097 0.0009 0.0088 116 0.0097 0.0009 0.0089 117 0.0098 0.0009 0.0089 118 0.0099 0.0009 0.0090 119 0.0100 0.0009 0.0091 120 0.0101 0.0009 0.0091 121 0.0102 0.0009 0.0092 11 1183
DA1PrSyn10yr24013
122 0.0102 0.0009 0.0093 123 0.0103 0.0009 0.0094 124 0.0104 0.0010 0.0094 125 0.0105 0.0010 0.0096 126 0.0106 0.0010 0.0096 127 0.0107 0.0010 0.0097 128 0.0108 0.0010 0.0098 129 0.0109 0.0010 0.0099 130 0.0110 0.0010 0.0100 131 0.0111 0.0010 0.0101 132 0.0112 0.0010 0.0102 133 0.0113 0.0010 0.0103 134 0.0114 0.0010 0.0104 135 0.0116 0.0011 0.0105 136 0.0116 0.0011 0.0106 137 0.0118 0.0011 0.0107 138 0.0119 0.0011 0.0108 139 0.0121 0.0011 0.0110 140 0.0122 0.0011 0.0110 141 0.0123 0.0011 0.0112 142 0.0124 0.0011 0.0113 143 0.0126 0.0012 0.0115 144 0.0127 0.0012 0.0116 145 0.0154 0.0014 0.0140 146 0.0155 0.0014 0.0141 147 0.0157 0.0014 0.0143 148 0.0159 0.0015 0.0144 149 0.0161 0.0015 0.0146 150 0.0162 0.0015 0.0147 151 0.0165 0.0015 0.0150 152 0.0166 0.0015 0.0151 153 0.0169 0.0015 0.0154 154 0.0171 0.0016 0.0155 155 0.0174 0.0016 0.0158 156 0.0175 0.0016 0.0159 157 0.0179 0.0016 0.0162 158 0.0180 0.0017 0.0164 159 0.0184 0.0017 0.0167 160 0.0186 0.0017 0.0169 161 0.0190 0.0017 0.0173 162 0.0192 0.0018 0.0175 163 0.0197 0.0018 0.0179 164 0.0199 0.0018 0.0181 165 0.0204 0.0019 0.0185 166 0.0206 0.0019 0.0187 167 0.0212 0.0019 0.0192 168 0.0215 0.0020 0.0195 169 0.0247 0.0023 0.0225 12 1184
DA1PrSyn10yr24013
170 0.0251 0.0023 0.0228 171 0.0258 0.0024 0.0234 172 0.0261 0.0024 0.0237 173 0.0269 0.0024 0.0245 174 0.0273 0.0024 0.0250 175 0.0283 0.0024 0.0259 176 0.0288 0.0024 0.0264 177 0.0299 0.0024 0.0275 178 0.0305 0.0024 0.0281 179 0.0318 0.0024 0.0294 180 0.0325 0.0024 0.0301 181 0.0342 0.0024 0.0318 182 0.0351 0.0024 0.0327 183 0.0373 0.0024 0.0349 184 0.0385 0.0024 0.0361 185 0.0307 0.0024 0.0283 186 0.0324 0.0024 0.0300 187 0.0368 0.0024 0.0344 188 0.0397 0.0024 0.0373 189 0.0479 0.0024 0.0455 190 0.0540 0.0024 0.0516 191 0.0772 0.0024 0.0748 192 0.1062 0.0024 0.1038 193 0.3323 0.0024 0.3299 194 0.0629 0.0024 0.0605 195 0.0433 0.0024 0.0409 196 0.0344 0.0024 0.0321 197 0.0399 0.0024 0.0375 198 0.0361 0.0024 0.0337 199 0.0333 0.0024 0.0309 200 0.0311 0.0024 0.0287 201 0.0293 0.0024 0.0269 202 0.0278 0.0024 0.0254 203 0.0265 0.0024 0.0241 204 0.0254 0.0023 0.0231 205 0.0218 0.0020 0.0198 206 0.0209 0.0019 0.0190 207 0.0201 0.0018 0.0183 208 0.0194 0.0018 0.0176 209 0.0188 0.0017 0.0171 210 0.0182 0.0017 0.0166 211 0.0177 0.0016 0.0161 212 0.0172 0.0016 0.0156 213 0.0168 0.0015 0.0152 214 0.0164 0.0015 0.0149 215 0.0160 0.0015 0.0145 216 0.0156 0.0014 0.0142 217 0.0128 0.0012 0.0117 13 1185
DA1PrSyn10yr24013
218 0.0125 0.0011 0.0114 219 0.0123 0.0011 0.0111 220 0.0120 0.0011 0.0109 221 0.0117 0.0011 0.0107 222 0.0115 0.0011 0.0104 223 0.0113 0.0010 0.0102 224 0.0110 0.0010 0.0100 225 0.0108 0.0010 0.0098 226 0.0106 0.0010 0.0097 227 0.0105 0.0010 0.0095 228 0.0103 0.0009 0.0093 229 0.0101 0.0009 0.0092 230 0.0100 0.0009 0.0090 231 0.0098 0.0009 0.0089 232 0.0096 0.0009 0.0088 233 0.0095 0.0009 0.0086 234 0.0094 0.0009 0.0085 235 0.0092 0.0008 0.0084 236 0.0091 0.0008 0.0083 237 0.0090 0.0008 0.0082 238 0.0089 0.0008 0.0081 239 0.0088 0.0008 0.0080 240 0.0086 0.0008 0.0079 241 0.0085 0.0008 0.0078 242 0.0084 0.0008 0.0077 243 0.0083 0.0008 0.0076 244 0.0082 0.0008 0.0075 245 0.0081 0.0007 0.0074 246 0.0080 0.0007 0.0073 247 0.0080 0.0007 0.0072 248 0.0079 0.0007 0.0072 249 0.0078 0.0007 0.0071 250 0.0077 0.0007 0.0070 251 0.0076 0.0007 0.0069 252 0.0076 0.0007 0.0069 253 0.0075 0.0007 0.0068 254 0.0074 0.0007 0.0067 255 0.0073 0.0007 0.0067 256 0.0073 0.0007 0.0066 257 0.0072 0.0007 0.0065 258 0.0071 0.0007 0.0065 259 0.0071 0.0006 0.0064 260 0.0070 0.0006 0.0064 261 0.0069 0.0006 0.0063 262 0.0069 0.0006 0.0063 263 0.0068 0.0006 0.0062 264 0.0068 0.0006 0.0062 265 0.0067 0.0006 0.0061 14 1186
DA1PrSyn10yr24013
266 0.0067 0.0006 0.0061 267 0.0066 0.0006 0.0060 268 0.0066 0.0006 0.0060 269 0.0065 0.0006 0.0059 270 0.0065 0.0006 0.0059 271 0.0064 0.0006 0.0058 272 0.0064 0.0006 0.0058 273 0.0063 0.0006 0.0057 274 0.0063 0.0006 0.0057 275 0.0062 0.0006 0.0056 276 0.0062 0.0006 0.0056 277 0.0061 0.0006 0.0056 278 0.0061 0.0006 0.0055 279 0.0060 0.0006 0.0055 280 0.0060 0.0005 0.0055 281 0.0060 0.0005 0.0054 282 0.0059 0.0005 0.0054 283 0.0059 0.0005 0.0053 284 0.0058 0.0005 0.0053 285 0.0058 0.0005 0.0053 286 0.0058 0.0005 0.0052 287 0.0057 0.0005 0.0052 288 0.0057 0.0005 0.0052 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Total soil rain loss = 0.30(In)
Total effective rainfall = 3.71(In)
Peak flow rate in flood hydrograph = 12.57(CFS)
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 ‐ H O U R S T O R M
R u n o f f H y d r o g r a p h
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Hydrograph in 5 Minute intervals ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Time(h+m) Volume Ac.Ft Q(CFS) 0 5.0 10.0 15.0 20.0 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 0+ 5 0.0004 0.06 Q | | | | 0+10 0.0020 0.24 Q | | | | 0+15 0.0039 0.27 Q | | | | 0+20 0.0058 0.27 Q | | | | 0+25 0.0076 0.27 Q | | | | 0+30 0.0095 0.27 Q | | | | 0+35 0.0114 0.27 Q | | | | 0+40 0.0133 0.28 Q | | | | 0+45 0.0152 0.28 Q | | | | 0+50 0.0171 0.28 Q | | | | 15 1187
DA1PrSyn10yr24013
0+55 0.0191 0.28 Q | | | | 1+ 0 0.0210 0.28 Q | | | | 1+ 5 0.0229 0.28 Q | | | | 1+10 0.0248 0.28 Q | | | | 1+15 0.0268 0.28 Q | | | | 1+20 0.0287 0.28 Q | | | | 1+25 0.0307 0.28 Q | | | | 1+30 0.0326 0.28 Q | | | | 1+35 0.0346 0.29 QV | | | | 1+40 0.0366 0.29 QV | | | | 1+45 0.0386 0.29 QV | | | | 1+50 0.0406 0.29 QV | | | | 1+55 0.0426 0.29 QV | | | | 2+ 0 0.0446 0.29 QV | | | | 2+ 5 0.0466 0.29 QV | | | | 2+10 0.0486 0.29 QV | | | | 2+15 0.0506 0.29 QV | | | | 2+20 0.0526 0.29 QV | | | | 2+25 0.0547 0.30 QV | | | | 2+30 0.0567 0.30 QV | | | | 2+35 0.0588 0.30 QV | | | | 2+40 0.0608 0.30 QV | | | | 2+45 0.0629 0.30 QV | | | | 2+50 0.0650 0.30 QV | | | | 2+55 0.0671 0.30 Q V | | | | 3+ 0 0.0691 0.30 Q V | | | | 3+ 5 0.0712 0.30 Q V | | | | 3+10 0.0734 0.31 Q V | | | | 3+15 0.0755 0.31 Q V | | | | 3+20 0.0776 0.31 Q V | | | | 3+25 0.0797 0.31 Q V | | | | 3+30 0.0819 0.31 Q V | | | | 3+35 0.0840 0.31 Q V | | | | 3+40 0.0862 0.31 Q V | | | | 3+45 0.0883 0.31 Q V | | | | 3+50 0.0905 0.32 Q V | | | | 3+55 0.0927 0.32 Q V | | | | 4+ 0 0.0949 0.32 Q V | | | | 4+ 5 0.0971 0.32 Q V | | | | 4+10 0.0993 0.32 Q V | | | | 4+15 0.1015 0.32 Q V | | | | 4+20 0.1037 0.32 Q V | | | | 4+25 0.1060 0.32 Q V | | | | 4+30 0.1082 0.33 Q V | | | | 4+35 0.1105 0.33 Q V | | | | 4+40 0.1127 0.33 Q V | | | | 4+45 0.1150 0.33 Q V | | | | 4+50 0.1173 0.33 Q V | | | | 16 1188
DA1PrSyn10yr24013
4+55 0.1196 0.33 Q V | | | | 5+ 0 0.1219 0.33 Q V | | | | 5+ 5 0.1242 0.34 Q V | | | | 5+10 0.1265 0.34 Q V | | | | 5+15 0.1289 0.34 Q V | | | | 5+20 0.1312 0.34 Q V | | | | 5+25 0.1336 0.34 Q V | | | | 5+30 0.1360 0.34 Q V | | | | 5+35 0.1383 0.35 Q V | | | | 5+40 0.1407 0.35 Q V | | | | 5+45 0.1431 0.35 Q V | | | | 5+50 0.1455 0.35 Q V | | | | 5+55 0.1480 0.35 Q V | | | | 6+ 0 0.1504 0.35 Q V | | | | 6+ 5 0.1529 0.36 Q V | | | | 6+10 0.1553 0.36 Q V | | | | 6+15 0.1578 0.36 Q V | | | | 6+20 0.1603 0.36 Q V | | | | 6+25 0.1628 0.36 Q V | | | | 6+30 0.1653 0.36 Q V | | | | 6+35 0.1678 0.37 Q V | | | | 6+40 0.1704 0.37 Q V | | | | 6+45 0.1729 0.37 Q V | | | | 6+50 0.1755 0.37 Q V | | | | 6+55 0.1780 0.37 Q V | | | | 7+ 0 0.1806 0.38 Q V | | | | 7+ 5 0.1832 0.38 Q V | | | | 7+10 0.1859 0.38 Q V | | | | 7+15 0.1885 0.38 Q V | | | | 7+20 0.1912 0.38 Q V | | | | 7+25 0.1938 0.39 Q V | | | | 7+30 0.1965 0.39 Q V | | | | 7+35 0.1992 0.39 Q V | | | | 7+40 0.2019 0.39 Q V | | | | 7+45 0.2046 0.40 Q V | | | | 7+50 0.2074 0.40 Q V | | | | 7+55 0.2101 0.40 Q V | | | | 8+ 0 0.2129 0.40 Q V | | | | 8+ 5 0.2157 0.41 Q V | | | | 8+10 0.2185 0.41 Q V | | | | 8+15 0.2213 0.41 Q V | | | | 8+20 0.2242 0.41 Q V | | | | 8+25 0.2271 0.42 Q V | | | | 8+30 0.2299 0.42 Q V | | | | 8+35 0.2328 0.42 Q V | | | | 8+40 0.2358 0.42 Q V | | | | 8+45 0.2387 0.43 Q V | | | | 8+50 0.2417 0.43 Q V | | | | 17 1189
DA1PrSyn10yr24013
8+55 0.2446 0.43 Q V | | | | 9+ 0 0.2476 0.44 Q V | | | | 9+ 5 0.2507 0.44 Q V | | | | 9+10 0.2537 0.44 Q V | | | | 9+15 0.2568 0.44 Q V | | | | 9+20 0.2599 0.45 Q V | | | | 9+25 0.2630 0.45 Q V | | | | 9+30 0.2661 0.46 Q V | | | | 9+35 0.2693 0.46 Q V | | | | 9+40 0.2724 0.46 Q V | | | | 9+45 0.2756 0.47 Q V | | | | 9+50 0.2789 0.47 Q V | | | | 9+55 0.2821 0.47 Q V | | | | 10+ 0 0.2854 0.48 Q V | | | | 10+ 5 0.2887 0.48 Q V | | | | 10+10 0.2921 0.48 Q V | | | | 10+15 0.2954 0.49 Q V | | | | 10+20 0.2988 0.49 Q V | | | | 10+25 0.3022 0.50 Q V| | | | 10+30 0.3057 0.50 |Q V| | | | 10+35 0.3092 0.51 |Q V| | | | 10+40 0.3127 0.51 |Q V| | | | 10+45 0.3162 0.51 |Q V| | | | 10+50 0.3198 0.52 |Q V| | | | 10+55 0.3234 0.52 |Q V| | | | 11+ 0 0.3271 0.53 |Q V| | | | 11+ 5 0.3307 0.53 |Q V| | | | 11+10 0.3345 0.54 |Q V| | | | 11+15 0.3382 0.54 |Q V | | | 11+20 0.3420 0.55 |Q V | | | 11+25 0.3458 0.56 |Q V | | | 11+30 0.3497 0.56 |Q V | | | 11+35 0.3536 0.57 |Q V | | | 11+40 0.3576 0.58 |Q V | | | 11+45 0.3616 0.58 |Q V | | | 11+50 0.3656 0.59 |Q V | | | 11+55 0.3697 0.59 |Q |V | | | 12+ 0 0.3739 0.60 |Q |V | | | 12+ 5 0.3782 0.63 |Q |V | | | 12+10 0.3832 0.72 |Q |V | | | 12+15 0.3883 0.74 |Q |V | | | 12+20 0.3934 0.75 |Q |V | | | 12+25 0.3987 0.76 |Q |V | | | 12+30 0.4039 0.77 |Q | V | | | 12+35 0.4093 0.78 |Q | V | | | 12+40 0.4147 0.79 |Q | V | | | 12+45 0.4202 0.79 |Q | V | | | 12+50 0.4257 0.81 |Q | V | | | 18 1190
DA1PrSyn10yr24013
12+55 0.4313 0.82 |Q | V | | | 13+ 0 0.4370 0.83 |Q | V | | | 13+ 5 0.4428 0.84 |Q | V | | | 13+10 0.4487 0.85 |Q | V | | | 13+15 0.4546 0.86 |Q | V | | | 13+20 0.4606 0.88 |Q | V | | | 13+25 0.4668 0.89 |Q | V | | | 13+30 0.4730 0.91 |Q | V | | | 13+35 0.4793 0.92 |Q | V | | | 13+40 0.4858 0.94 |Q | V | | | 13+45 0.4923 0.95 |Q | V | | | 13+50 0.4990 0.97 |Q | V | | | 13+55 0.5058 0.99 |Q | V | | | 14+ 0 0.5128 1.01 | Q | V | | | 14+ 5 0.5200 1.06 | Q | V | | | 14+10 0.5280 1.16 | Q | V | | | 14+15 0.5363 1.20 | Q | V | | | 14+20 0.5447 1.23 | Q | V | | | 14+25 0.5533 1.25 | Q | V | | | 14+30 0.5622 1.29 | Q | V | | | 14+35 0.5713 1.32 | Q | V | | | 14+40 0.5806 1.36 | Q | V | | | 14+45 0.5902 1.39 | Q | V | | | 14+50 0.6001 1.44 | Q | V | | | 14+55 0.6103 1.48 | Q | V | | | 15+ 0 0.6210 1.54 | Q | V | | | 15+ 5 0.6319 1.59 | Q | V | | | 15+10 0.6434 1.67 | Q | V| | | 15+15 0.6554 1.73 | Q | V| | | 15+20 0.6680 1.83 | Q | V| | | 15+25 0.6803 1.79 | Q | V | | 15+30 0.6910 1.56 | Q | V | | 15+35 0.7022 1.62 | Q | V | | 15+40 0.7146 1.81 | Q | |V | | 15+45 0.7286 2.03 | Q | |V | | 15+50 0.7452 2.40 | Q | | V | | 15+55 0.7654 2.94 | Q | | V | | 16+ 0 0.7937 4.11 | Q | | V | | 16+ 5 0.8482 7.91 | | Q | V | | 16+10 0.9348 12.57 | | | Q V | | 16+15 0.9667 4.64 | Q| | V | | 16+20 0.9826 2.31 | Q | | V| | 16+25 0.9951 1.82 | Q | | V| | 16+30 1.0082 1.89 | Q | | V | 16+35 1.0203 1.76 | Q | | V | 16+40 1.0314 1.62 | Q | | V | 16+45 1.0417 1.50 | Q | | |V | 16+50 1.0514 1.41 | Q | | |V | 19 1191
DA1PrSyn10yr24013
16+55 1.0606 1.33 | Q | | |V | 17+ 0 1.0693 1.26 | Q | | |V | 17+ 5 1.0774 1.18 | Q | | | V | 17+10 1.0846 1.05 | Q | | | V | 17+15 1.0915 0.99 |Q | | | V | 17+20 1.0981 0.96 |Q | | | V | 17+25 1.1044 0.92 |Q | | | V | 17+30 1.1106 0.89 |Q | | | V | 17+35 1.1165 0.87 |Q | | | V | 17+40 1.1223 0.84 |Q | | | V | 17+45 1.1280 0.82 |Q | | | V | 17+50 1.1335 0.80 |Q | | | V | 17+55 1.1388 0.78 |Q | | | V | 18+ 0 1.1441 0.76 |Q | | | V | 18+ 5 1.1490 0.72 |Q | | | V | 18+10 1.1533 0.63 |Q | | | V | 18+15 1.1574 0.60 |Q | | | V | 18+20 1.1614 0.58 |Q | | | V | 18+25 1.1654 0.57 |Q | | | V | 18+30 1.1692 0.56 |Q | | | V | 18+35 1.1730 0.55 |Q | | | V | 18+40 1.1767 0.54 |Q | | | V | 18+45 1.1803 0.53 |Q | | | V | 18+50 1.1838 0.52 |Q | | | V | 18+55 1.1873 0.51 |Q | | | V | 19+ 0 1.1908 0.50 Q | | | V | 19+ 5 1.1941 0.49 Q | | | V | 19+10 1.1974 0.48 Q | | | V | 19+15 1.2007 0.47 Q | | | V | 19+20 1.2039 0.47 Q | | | V | 19+25 1.2071 0.46 Q | | | V | 19+30 1.2102 0.45 Q | | | V | 19+35 1.2133 0.45 Q | | | V | 19+40 1.2163 0.44 Q | | | V | 19+45 1.2193 0.43 Q | | | V | 19+50 1.2222 0.43 Q | | | V | 19+55 1.2251 0.42 Q | | | V | 20+ 0 1.2280 0.42 Q | | | V | 20+ 5 1.2308 0.41 Q | | | V | 20+10 1.2336 0.41 Q | | | V | 20+15 1.2364 0.40 Q | | | V | 20+20 1.2391 0.40 Q | | | V | 20+25 1.2418 0.39 Q | | | V | 20+30 1.2445 0.39 Q | | | V | 20+35 1.2471 0.38 Q | | | V | 20+40 1.2497 0.38 Q | | | V | 20+45 1.2523 0.37 Q | | | V | 20+50 1.2549 0.37 Q | | | V | 20 1192
DA1PrSyn10yr24013
20+55 1.2574 0.37 Q | | | V | 21+ 0 1.2599 0.36 Q | | | V | 21+ 5 1.2624 0.36 Q | | | V | 21+10 1.2648 0.36 Q | | | V | 21+15 1.2673 0.35 Q | | | V | 21+20 1.2697 0.35 Q | | | V | 21+25 1.2721 0.35 Q | | | V | 21+30 1.2744 0.34 Q | | | V | 21+35 1.2768 0.34 Q | | | V | 21+40 1.2791 0.34 Q | | | V | 21+45 1.2814 0.33 Q | | | V | 21+50 1.2837 0.33 Q | | | V | 21+55 1.2859 0.33 Q | | | V | 22+ 0 1.2881 0.33 Q | | | V | 22+ 5 1.2904 0.32 Q | | | V | 22+10 1.2926 0.32 Q | | | V | 22+15 1.2948 0.32 Q | | | V | 22+20 1.2969 0.31 Q | | | V | 22+25 1.2991 0.31 Q | | | V | 22+30 1.3012 0.31 Q | | | V | 22+35 1.3033 0.31 Q | | | V | 22+40 1.3054 0.31 Q | | | V| 22+45 1.3075 0.30 Q | | | V| 22+50 1.3096 0.30 Q | | | V| 22+55 1.3116 0.30 Q | | | V| 23+ 0 1.3137 0.30 Q | | | V| 23+ 5 1.3157 0.29 Q | | | V| 23+10 1.3177 0.29 Q | | | V| 23+15 1.3197 0.29 Q | | | V| 23+20 1.3217 0.29 Q | | | V| 23+25 1.3237 0.29 Q | | | V| 23+30 1.3256 0.28 Q | | | V| 23+35 1.3276 0.28 Q | | | V| 23+40 1.3295 0.28 Q | | | V| 23+45 1.3314 0.28 Q | | | V| 23+50 1.3333 0.28 Q | | | V| 23+55 1.3352 0.27 Q | | | V| 24+ 0 1.3371 0.27 Q | | | V| 24+ 5 1.3385 0.21 Q | | | V| 24+10 1.3388 0.03 Q | | | V| 24+15 1.3388 0.00 Q | | | V| ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 21 1193
DA1PrSyn100yr24013
U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2018, Version 9.0 Study date 10/06/25
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ San Bernardino County Synthetic Unit Hydrology Method
Manual date ‐ August 1986
Program License Serial Number 6474
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Commercial Development
Post‐developed DA1, 100‐YR
SEC Riverside Drive and Ontario (Champion) Avenue,
Ontario CA 91761
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Storm Event Year = 100
Antecedent Moisture Condition = 3
English (in‐lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
Area averaged rainfall intensity isohyetal data:
Sub‐ Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 100
4.34 1 1.36
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rainfall data for year 100
4.34 6 3.36
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rainfall data for year 100
1 1194
DA1PrSyn100yr24013
4.34 24 6.02
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ********
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 3) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)
86.0 97.2 4.34 1.000 0.055 0.108 0.006 Area‐averaged adjusted loss rate Fm (In/Hr) = 0.006
********* Area‐Averaged low loss rate fraction, Yb ********** Area Area SCS CN SCS CN S Pervious (Ac.) Fract (AMC2) (AMC3) Yield Fr
0.47 0.108 86.0 97.2 0.29 0.945
3.87 0.892 98.0 98.0 0.20 0.960 Area‐averaged catchment yield fraction, Y = 0.959
Area‐averaged low loss fraction, Yb = 0.041
User entry of time of concentration = 0.090 (hours)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Watershed area = 4.34(Ac.)
Catchment Lag time = 0.072 hours
Unit interval = 5.000 minutes
Unit interval percentage of lag time = 115.8695
Hydrograph baseflow = 0.00(CFS)
Average maximum watershed loss rate(Fm) = 0.006(In/Hr) Average low loss rate fraction (Yb) = 0.041 (decimal)
VALLEY DEVELOPED S‐Graph Selected
Computed peak 5‐minute rainfall = 0.503(In)
Computed peak 30‐minute rainfall = 1.031(In)
Specified peak 1‐hour rainfall = 1.360(In)
Computed peak 3‐hour rainfall = 2.410(In)
Specified peak 6‐hour rainfall = 3.360(In)
Specified peak 24‐hour rainfall = 6.020(In)
Note: user specified rainfall values used.
Rainfall depth area reduction factors:
Using a total area of 4.34(Ac.) (Ref: fig. E‐4)
5‐minute factor = 1.000 Adjusted rainfall = 0.503(In) 30‐minute factor = 1.000 Adjusted rainfall = 1.030(In) 1‐hour factor = 1.000 Adjusted rainfall = 1.360(In) 3‐hour factor = 1.000 Adjusted rainfall = 2.410(In) 2 1195
DA1PrSyn100yr24013
6‐hour factor = 1.000 Adjusted rainfall = 3.360(In) 24‐hour factor = 1.000 Adjusted rainfall = 6.020(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ U n i t H y d r o g r a p h
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval 'S' Graph Unit Hydrograph
Number Mean values ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ (K = 52.45 (CFS))
1 22.589 11.848
2 87.148 33.861
3 99.001 6.217
4 100.000 0.524
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Peak Unit Adjusted mass rainfall Unit rainfall
Number (In) (In)
1 0.5032 0.5032
2 0.6640 0.1608
3 0.7810 0.1169
4 0.8762 0.0952
5 0.9580 0.0818
6 1.0305 0.0725
7 1.0960 0.0655
8 1.1561 0.0601
9 1.2119 0.0558
10 1.2641 0.0522
11 1.3132 0.0491
12 1.3597 0.0465
13 1.4176 0.0579
14 1.4734 0.0558
15 1.5273 0.0539
16 1.5796 0.0522
17 1.6302 0.0507
18 1.6795 0.0493
19 1.7275 0.0480
20 1.7743 0.0468
21 1.8200 0.0457
22 1.8646 0.0446
23 1.9083 0.0437
24 1.9511 0.0428
25 1.9930 0.0419
26 2.0341 0.0411
27 2.0745 0.0404
28 2.1142 0.0397
29 2.1532 0.0390
30 2.1916 0.0384
3 1196
DA1PrSyn100yr24013
31 2.2293 0.0378
32 2.2665 0.0372
33 2.3031 0.0366
34 2.3392 0.0361
35 2.3748 0.0356
36 2.4099 0.0351
37 2.4418 0.0319
38 2.4732 0.0314
39 2.5042 0.0310
40 2.5348 0.0306
41 2.5650 0.0302
42 2.5948 0.0298
43 2.6242 0.0294
44 2.6533 0.0291
45 2.6821 0.0287
46 2.7105 0.0284
47 2.7386 0.0281
48 2.7664 0.0278
49 2.7938 0.0275
50 2.8210 0.0272
51 2.8479 0.0269
52 2.8746 0.0266
53 2.9009 0.0264
54 2.9271 0.0261
55 2.9529 0.0259
56 2.9785 0.0256
57 3.0039 0.0254
58 3.0291 0.0252
59 3.0540 0.0249
60 3.0787 0.0247
61 3.1032 0.0245
62 3.1275 0.0243
63 3.1516 0.0241
64 3.1755 0.0239
65 3.1992 0.0237
66 3.2227 0.0235
67 3.2460 0.0233
68 3.2691 0.0231
69 3.2921 0.0230
70 3.3149 0.0228
71 3.3375 0.0226
72 3.3600 0.0225
73 3.3795 0.0196
74 3.3989 0.0194
75 3.4182 0.0192
76 3.4372 0.0191
77 3.4562 0.0190
78 3.4750 0.0188
4 1197
DA1PrSyn100yr24013
79 3.4937 0.0187
80 3.5122 0.0185
81 3.5306 0.0184
82 3.5489 0.0183
83 3.5670 0.0181
84 3.5850 0.0180
85 3.6029 0.0179
86 3.6207 0.0178
87 3.6384 0.0177
88 3.6559 0.0175
89 3.6733 0.0174
90 3.6906 0.0173
91 3.7078 0.0172
92 3.7249 0.0171
93 3.7419 0.0170
94 3.7588 0.0169
95 3.7755 0.0168
96 3.7922 0.0167
97 3.8088 0.0166
98 3.8252 0.0165
99 3.8416 0.0164
100 3.8579 0.0163
101 3.8741 0.0162
102 3.8901 0.0161
103 3.9061 0.0160
104 3.9220 0.0159
105 3.9379 0.0158
106 3.9536 0.0157
107 3.9692 0.0156
108 3.9848 0.0156
109 4.0003 0.0155
110 4.0157 0.0154
111 4.0310 0.0153
112 4.0462 0.0152
113 4.0614 0.0152
114 4.0765 0.0151
115 4.0915 0.0150
116 4.1064 0.0149
117 4.1213 0.0149
118 4.1360 0.0148
119 4.1508 0.0147
120 4.1654 0.0146
121 4.1800 0.0146
122 4.1945 0.0145
123 4.2089 0.0144
124 4.2232 0.0144
125 4.2375 0.0143
126 4.2518 0.0142
5 1198
DA1PrSyn100yr24013
127 4.2659 0.0142
128 4.2800 0.0141
129 4.2941 0.0140
130 4.3080 0.0140
131 4.3219 0.0139
132 4.3358 0.0138
133 4.3496 0.0138
134 4.3633 0.0137
135 4.3770 0.0137
136 4.3906 0.0136
137 4.4041 0.0136
138 4.4176 0.0135
139 4.4311 0.0134
140 4.4444 0.0134
141 4.4578 0.0133
142 4.4710 0.0133
143 4.4843 0.0132
144 4.4974 0.0132
145 4.5105 0.0131
146 4.5236 0.0131
147 4.5366 0.0130
148 4.5496 0.0130
149 4.5625 0.0129
150 4.5753 0.0129
151 4.5881 0.0128
152 4.6009 0.0128
153 4.6136 0.0127
154 4.6263 0.0127
155 4.6389 0.0126
156 4.6514 0.0126
157 4.6640 0.0125
158 4.6764 0.0125
159 4.6889 0.0124
160 4.7012 0.0124
161 4.7136 0.0123
162 4.7259 0.0123
163 4.7381 0.0122
164 4.7503 0.0122
165 4.7625 0.0122
166 4.7746 0.0121
167 4.7867 0.0121
168 4.7987 0.0120
169 4.8107 0.0120
170 4.8227 0.0120
171 4.8346 0.0119
172 4.8465 0.0119
173 4.8583 0.0118
174 4.8701 0.0118
6 1199
DA1PrSyn100yr24013
175 4.8818 0.0118
176 4.8936 0.0117
177 4.9052 0.0117
178 4.9169 0.0116
179 4.9285 0.0116
180 4.9400 0.0116
181 4.9516 0.0115
182 4.9630 0.0115
183 4.9745 0.0115
184 4.9859 0.0114
185 4.9973 0.0114
186 5.0086 0.0113
187 5.0200 0.0113
188 5.0312 0.0113
189 5.0425 0.0112
190 5.0537 0.0112
191 5.0648 0.0112
192 5.0760 0.0111
193 5.0871 0.0111
194 5.0982 0.0111
195 5.1092 0.0110
196 5.1202 0.0110
197 5.1312 0.0110
198 5.1421 0.0109
199 5.1530 0.0109
200 5.1639 0.0109
201 5.1747 0.0108
202 5.1856 0.0108
203 5.1963 0.0108
204 5.2071 0.0108
205 5.2178 0.0107
206 5.2285 0.0107
207 5.2392 0.0107
208 5.2498 0.0106
209 5.2604 0.0106
210 5.2710 0.0106
211 5.2815 0.0105
212 5.2920 0.0105
213 5.3025 0.0105
214 5.3130 0.0105
215 5.3234 0.0104
216 5.3338 0.0104
217 5.3442 0.0104
218 5.3545 0.0103
219 5.3649 0.0103
220 5.3751 0.0103
221 5.3854 0.0103
222 5.3956 0.0102
7 1200
DA1PrSyn100yr24013
223 5.4059 0.0102
224 5.4160 0.0102
225 5.4262 0.0102
226 5.4363 0.0101
227 5.4464 0.0101
228 5.4565 0.0101
229 5.4666 0.0101
230 5.4766 0.0100
231 5.4866 0.0100
232 5.4966 0.0100
233 5.5065 0.0100
234 5.5165 0.0099
235 5.5264 0.0099
236 5.5362 0.0099
237 5.5461 0.0099
238 5.5559 0.0098
239 5.5657 0.0098
240 5.5755 0.0098
241 5.5853 0.0098
242 5.5950 0.0097
243 5.6047 0.0097
244 5.6144 0.0097
245 5.6241 0.0097
246 5.6337 0.0096
247 5.6434 0.0096
248 5.6530 0.0096
249 5.6625 0.0096
250 5.6721 0.0096
251 5.6816 0.0095
252 5.6911 0.0095
253 5.7006 0.0095
254 5.7101 0.0095
255 5.7195 0.0094
256 5.7290 0.0094
257 5.7384 0.0094
258 5.7478 0.0094
259 5.7571 0.0094
260 5.7665 0.0093
261 5.7758 0.0093
262 5.7851 0.0093
263 5.7944 0.0093
264 5.8036 0.0093
265 5.8128 0.0092
266 5.8221 0.0092
267 5.8313 0.0092
268 5.8404 0.0092
269 5.8496 0.0092
270 5.8587 0.0091
8 1201
DA1PrSyn100yr24013
271 5.8679 0.0091
272 5.8769 0.0091
273 5.8860 0.0091
274 5.8951 0.0091
275 5.9041 0.0090
276 5.9132 0.0090
277 5.9222 0.0090
278 5.9311 0.0090
279 5.9401 0.0090
280 5.9491 0.0089
281 5.9580 0.0089
282 5.9669 0.0089
283 5.9758 0.0089
284 5.9847 0.0089
285 5.9935 0.0089
286 6.0023 0.0088
287 6.0112 0.0088
288 6.0200 0.0088
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Unit Unit Unit Effective Period Rainfall Soil‐Loss Rainfall (number) (In) (In) (In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 1 0.0088 0.0004 0.0084 2 0.0088 0.0004 0.0085 3 0.0089 0.0004 0.0085 4 0.0089 0.0004 0.0085 5 0.0089 0.0004 0.0085 6 0.0089 0.0004 0.0086 7 0.0090 0.0004 0.0086 8 0.0090 0.0004 0.0086 9 0.0090 0.0004 0.0086 10 0.0090 0.0004 0.0087 11 0.0091 0.0004 0.0087 12 0.0091 0.0004 0.0087 13 0.0091 0.0004 0.0088 14 0.0092 0.0004 0.0088 15 0.0092 0.0004 0.0088 16 0.0092 0.0004 0.0088 17 0.0093 0.0004 0.0089 18 0.0093 0.0004 0.0089 19 0.0093 0.0004 0.0089 20 0.0093 0.0004 0.0090 21 0.0094 0.0004 0.0090 22 0.0094 0.0004 0.0090 23 0.0094 0.0004 0.0091 24 0.0095 0.0004 0.0091 25 0.0095 0.0004 0.0091 9 1202
DA1PrSyn100yr24013
26 0.0095 0.0004 0.0091 27 0.0096 0.0004 0.0092 28 0.0096 0.0004 0.0092 29 0.0096 0.0004 0.0092 30 0.0097 0.0004 0.0093 31 0.0097 0.0004 0.0093 32 0.0097 0.0004 0.0093 33 0.0098 0.0004 0.0094 34 0.0098 0.0004 0.0094 35 0.0099 0.0004 0.0094 36 0.0099 0.0004 0.0095 37 0.0099 0.0004 0.0095 38 0.0100 0.0004 0.0095 39 0.0100 0.0004 0.0096 40 0.0100 0.0004 0.0096 41 0.0101 0.0004 0.0097 42 0.0101 0.0004 0.0097 43 0.0102 0.0004 0.0097 44 0.0102 0.0004 0.0098 45 0.0102 0.0004 0.0098 46 0.0103 0.0004 0.0098 47 0.0103 0.0004 0.0099 48 0.0103 0.0004 0.0099 49 0.0104 0.0004 0.0100 50 0.0104 0.0004 0.0100 51 0.0105 0.0004 0.0101 52 0.0105 0.0004 0.0101 53 0.0106 0.0004 0.0101 54 0.0106 0.0004 0.0102 55 0.0107 0.0004 0.0102 56 0.0107 0.0004 0.0103 57 0.0108 0.0004 0.0103 58 0.0108 0.0004 0.0103 59 0.0108 0.0004 0.0104 60 0.0109 0.0004 0.0104 61 0.0109 0.0005 0.0105 62 0.0110 0.0005 0.0105 63 0.0110 0.0005 0.0106 64 0.0111 0.0005 0.0106 65 0.0111 0.0005 0.0107 66 0.0112 0.0005 0.0107 67 0.0112 0.0005 0.0108 68 0.0113 0.0005 0.0108 69 0.0113 0.0005 0.0109 70 0.0114 0.0005 0.0109 71 0.0115 0.0005 0.0110 72 0.0115 0.0005 0.0110 73 0.0116 0.0005 0.0111 10 1203
DA1PrSyn100yr24013
74 0.0116 0.0005 0.0111 75 0.0117 0.0005 0.0112 76 0.0117 0.0005 0.0112 77 0.0118 0.0005 0.0113 78 0.0118 0.0005 0.0113 79 0.0119 0.0005 0.0114 80 0.0120 0.0005 0.0115 81 0.0120 0.0005 0.0115 82 0.0121 0.0005 0.0116 83 0.0122 0.0005 0.0117 84 0.0122 0.0005 0.0117 85 0.0123 0.0005 0.0118 86 0.0123 0.0005 0.0118 87 0.0124 0.0005 0.0119 88 0.0125 0.0005 0.0120 89 0.0126 0.0005 0.0121 90 0.0126 0.0005 0.0121 91 0.0127 0.0005 0.0122 92 0.0128 0.0005 0.0123 93 0.0129 0.0005 0.0124 94 0.0129 0.0005 0.0124 95 0.0130 0.0005 0.0125 96 0.0131 0.0005 0.0126 97 0.0132 0.0005 0.0127 98 0.0132 0.0005 0.0127 99 0.0133 0.0005 0.0128 100 0.0134 0.0005 0.0129 101 0.0135 0.0005 0.0130 102 0.0136 0.0005 0.0131 103 0.0137 0.0005 0.0132 104 0.0137 0.0005 0.0132 105 0.0138 0.0005 0.0133 106 0.0139 0.0005 0.0134 107 0.0140 0.0005 0.0135 108 0.0141 0.0005 0.0136 109 0.0142 0.0005 0.0137 110 0.0143 0.0005 0.0138 111 0.0144 0.0005 0.0139 112 0.0145 0.0005 0.0140 113 0.0146 0.0005 0.0141 114 0.0147 0.0005 0.0142 115 0.0149 0.0005 0.0144 116 0.0149 0.0005 0.0144 117 0.0151 0.0005 0.0146 118 0.0152 0.0005 0.0147 119 0.0153 0.0005 0.0148 120 0.0154 0.0005 0.0149 121 0.0156 0.0005 0.0151 11 1204
DA1PrSyn100yr24013
122 0.0156 0.0005 0.0151 123 0.0158 0.0005 0.0153 124 0.0159 0.0005 0.0154 125 0.0161 0.0005 0.0156 126 0.0162 0.0005 0.0157 127 0.0164 0.0005 0.0159 128 0.0165 0.0005 0.0160 129 0.0167 0.0005 0.0162 130 0.0168 0.0005 0.0163 131 0.0170 0.0005 0.0165 132 0.0171 0.0005 0.0166 133 0.0173 0.0005 0.0168 134 0.0174 0.0005 0.0169 135 0.0177 0.0005 0.0172 136 0.0178 0.0005 0.0173 137 0.0180 0.0005 0.0175 138 0.0181 0.0005 0.0176 139 0.0184 0.0005 0.0179 140 0.0185 0.0005 0.0180 141 0.0188 0.0005 0.0183 142 0.0190 0.0005 0.0185 143 0.0192 0.0005 0.0187 144 0.0194 0.0005 0.0189 145 0.0225 0.0005 0.0220 146 0.0226 0.0005 0.0221 147 0.0230 0.0005 0.0225 148 0.0231 0.0005 0.0226 149 0.0235 0.0005 0.0230 150 0.0237 0.0005 0.0232 151 0.0241 0.0005 0.0236 152 0.0243 0.0005 0.0238 153 0.0247 0.0005 0.0242 154 0.0249 0.0005 0.0244 155 0.0254 0.0005 0.0249 156 0.0256 0.0005 0.0251 157 0.0261 0.0005 0.0256 158 0.0264 0.0005 0.0259 159 0.0269 0.0005 0.0264 160 0.0272 0.0005 0.0267 161 0.0278 0.0005 0.0273 162 0.0281 0.0005 0.0276 163 0.0287 0.0005 0.0282 164 0.0291 0.0005 0.0286 165 0.0298 0.0005 0.0293 166 0.0302 0.0005 0.0297 167 0.0310 0.0005 0.0305 168 0.0314 0.0005 0.0309 169 0.0351 0.0005 0.0346 12 1205
DA1PrSyn100yr24013
170 0.0356 0.0005 0.0351 171 0.0366 0.0005 0.0361 172 0.0372 0.0005 0.0367 173 0.0384 0.0005 0.0379 174 0.0390 0.0005 0.0385 175 0.0404 0.0005 0.0399 176 0.0411 0.0005 0.0406 177 0.0428 0.0005 0.0423 178 0.0437 0.0005 0.0432 179 0.0457 0.0005 0.0452 180 0.0468 0.0005 0.0463 181 0.0493 0.0005 0.0488 182 0.0507 0.0005 0.0502 183 0.0539 0.0005 0.0534 184 0.0558 0.0005 0.0553 185 0.0465 0.0005 0.0460 186 0.0491 0.0005 0.0486 187 0.0558 0.0005 0.0553 188 0.0601 0.0005 0.0596 189 0.0725 0.0005 0.0720 190 0.0818 0.0005 0.0813 191 0.1169 0.0005 0.1164 192 0.1608 0.0005 0.1603 193 0.5032 0.0005 0.5027 194 0.0952 0.0005 0.0947 195 0.0655 0.0005 0.0650 196 0.0522 0.0005 0.0517 197 0.0579 0.0005 0.0574 198 0.0522 0.0005 0.0517 199 0.0480 0.0005 0.0475 200 0.0446 0.0005 0.0441 201 0.0419 0.0005 0.0414 202 0.0397 0.0005 0.0392 203 0.0378 0.0005 0.0373 204 0.0361 0.0005 0.0356 205 0.0319 0.0005 0.0314 206 0.0306 0.0005 0.0301 207 0.0294 0.0005 0.0289 208 0.0284 0.0005 0.0279 209 0.0275 0.0005 0.0270 210 0.0266 0.0005 0.0261 211 0.0259 0.0005 0.0254 212 0.0252 0.0005 0.0247 213 0.0245 0.0005 0.0240 214 0.0239 0.0005 0.0234 215 0.0233 0.0005 0.0228 216 0.0228 0.0005 0.0223 217 0.0196 0.0005 0.0191 13 1206
DA1PrSyn100yr24013
218 0.0191 0.0005 0.0186 219 0.0187 0.0005 0.0182 220 0.0183 0.0005 0.0178 221 0.0179 0.0005 0.0174 222 0.0175 0.0005 0.0170 223 0.0172 0.0005 0.0167 224 0.0169 0.0005 0.0164 225 0.0166 0.0005 0.0161 226 0.0163 0.0005 0.0158 227 0.0160 0.0005 0.0155 228 0.0157 0.0005 0.0152 229 0.0155 0.0005 0.0150 230 0.0152 0.0005 0.0147 231 0.0150 0.0005 0.0145 232 0.0148 0.0005 0.0143 233 0.0146 0.0005 0.0141 234 0.0144 0.0005 0.0139 235 0.0142 0.0005 0.0137 236 0.0140 0.0005 0.0135 237 0.0138 0.0005 0.0133 238 0.0136 0.0005 0.0131 239 0.0134 0.0005 0.0129 240 0.0133 0.0005 0.0128 241 0.0131 0.0005 0.0126 242 0.0130 0.0005 0.0125 243 0.0128 0.0005 0.0123 244 0.0127 0.0005 0.0122 245 0.0125 0.0005 0.0120 246 0.0124 0.0005 0.0119 247 0.0122 0.0005 0.0117 248 0.0121 0.0005 0.0116 249 0.0120 0.0005 0.0115 250 0.0119 0.0005 0.0114 251 0.0118 0.0005 0.0113 252 0.0116 0.0005 0.0112 253 0.0115 0.0005 0.0111 254 0.0114 0.0005 0.0109 255 0.0113 0.0005 0.0108 256 0.0112 0.0005 0.0107 257 0.0111 0.0005 0.0106 258 0.0110 0.0005 0.0106 259 0.0109 0.0005 0.0105 260 0.0108 0.0004 0.0104 261 0.0107 0.0004 0.0103 262 0.0106 0.0004 0.0102 263 0.0105 0.0004 0.0101 264 0.0105 0.0004 0.0100 265 0.0104 0.0004 0.0099 14 1207
DA1PrSyn100yr24013
266 0.0103 0.0004 0.0099 267 0.0102 0.0004 0.0098 268 0.0101 0.0004 0.0097 269 0.0101 0.0004 0.0096 270 0.0100 0.0004 0.0096 271 0.0099 0.0004 0.0095 272 0.0098 0.0004 0.0094 273 0.0098 0.0004 0.0094 274 0.0097 0.0004 0.0093 275 0.0096 0.0004 0.0092 276 0.0096 0.0004 0.0092 277 0.0095 0.0004 0.0091 278 0.0094 0.0004 0.0090 279 0.0094 0.0004 0.0090 280 0.0093 0.0004 0.0089 281 0.0092 0.0004 0.0089 282 0.0092 0.0004 0.0088 283 0.0091 0.0004 0.0087 284 0.0091 0.0004 0.0087 285 0.0090 0.0004 0.0086 286 0.0089 0.0004 0.0086 287 0.0089 0.0004 0.0085 288 0.0088 0.0004 0.0085 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Total soil rain loss = 0.13(In)
Total effective rainfall = 5.89(In)
Peak flow rate in flood hydrograph = 19.20(CFS)
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 ‐ H O U R S T O R M
R u n o f f H y d r o g r a p h
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Hydrograph in 5 Minute intervals ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Time(h+m) Volume Ac.Ft Q(CFS) 0 5.0 10.0 15.0 20.0 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 0+ 5 0.0007 0.10 Q | | | | 0+10 0.0033 0.39 Q | | | | 0+15 0.0064 0.44 Q | | | | 0+20 0.0094 0.45 Q | | | | 0+25 0.0125 0.45 Q | | | | 0+30 0.0156 0.45 Q | | | | 0+35 0.0187 0.45 Q | | | | 0+40 0.0218 0.45 Q | | | | 0+45 0.0249 0.45 Q | | | | 0+50 0.0280 0.45 Q | | | | 15 1208
DA1PrSyn100yr24013
0+55 0.0312 0.45 Q | | | | 1+ 0 0.0343 0.46 Q | | | | 1+ 5 0.0375 0.46 Q | | | | 1+10 0.0406 0.46 Q | | | | 1+15 0.0438 0.46 Q | | | | 1+20 0.0470 0.46 Q | | | | 1+25 0.0502 0.46 Q | | | | 1+30 0.0534 0.47 QV | | | | 1+35 0.0566 0.47 QV | | | | 1+40 0.0598 0.47 QV | | | | 1+45 0.0631 0.47 QV | | | | 1+50 0.0663 0.47 QV | | | | 1+55 0.0696 0.47 QV | | | | 2+ 0 0.0728 0.47 QV | | | | 2+ 5 0.0761 0.48 QV | | | | 2+10 0.0794 0.48 QV | | | | 2+15 0.0827 0.48 QV | | | | 2+20 0.0860 0.48 QV | | | | 2+25 0.0894 0.48 QV | | | | 2+30 0.0927 0.48 QV | | | | 2+35 0.0961 0.49 QV | | | | 2+40 0.0994 0.49 QV | | | | 2+45 0.1028 0.49 QV | | | | 2+50 0.1062 0.49 QV | | | | 2+55 0.1096 0.49 Q V | | | | 3+ 0 0.1130 0.50 Q V | | | | 3+ 5 0.1164 0.50 Q V | | | | 3+10 0.1199 0.50 Q V | | | | 3+15 0.1233 0.50 |QV | | | | 3+20 0.1268 0.50 |QV | | | | 3+25 0.1303 0.50 |QV | | | | 3+30 0.1337 0.51 |QV | | | | 3+35 0.1372 0.51 |QV | | | | 3+40 0.1408 0.51 |QV | | | | 3+45 0.1443 0.51 |QV | | | | 3+50 0.1478 0.51 |QV | | | | 3+55 0.1514 0.52 |QV | | | | 4+ 0 0.1550 0.52 |QV | | | | 4+ 5 0.1586 0.52 |QV | | | | 4+10 0.1622 0.52 |Q V | | | | 4+15 0.1658 0.52 |Q V | | | | 4+20 0.1694 0.53 |Q V | | | | 4+25 0.1730 0.53 |Q V | | | | 4+30 0.1767 0.53 |Q V | | | | 4+35 0.1804 0.53 |Q V | | | | 4+40 0.1841 0.54 |Q V | | | | 4+45 0.1878 0.54 |Q V | | | | 4+50 0.1915 0.54 |Q V | | | | 16 1209
DA1PrSyn100yr24013
4+55 0.1952 0.54 |Q V | | | | 5+ 0 0.1990 0.55 |Q V | | | | 5+ 5 0.2028 0.55 |Q V | | | | 5+10 0.2066 0.55 |Q V | | | | 5+15 0.2104 0.55 |Q V | | | | 5+20 0.2142 0.56 |Q V | | | | 5+25 0.2180 0.56 |Q V | | | | 5+30 0.2219 0.56 |Q V | | | | 5+35 0.2258 0.56 |Q V | | | | 5+40 0.2296 0.57 |Q V | | | | 5+45 0.2336 0.57 |Q V | | | | 5+50 0.2375 0.57 |Q V | | | | 5+55 0.2414 0.57 |Q V | | | | 6+ 0 0.2454 0.58 |Q V | | | | 6+ 5 0.2494 0.58 |Q V | | | | 6+10 0.2534 0.58 |Q V | | | | 6+15 0.2574 0.58 |Q V | | | | 6+20 0.2614 0.59 |Q V | | | | 6+25 0.2655 0.59 |Q V | | | | 6+30 0.2696 0.59 |Q V | | | | 6+35 0.2737 0.60 |Q V | | | | 6+40 0.2778 0.60 |Q V | | | | 6+45 0.2820 0.60 |Q V | | | | 6+50 0.2861 0.61 |Q V | | | | 6+55 0.2903 0.61 |Q V | | | | 7+ 0 0.2945 0.61 |Q V | | | | 7+ 5 0.2988 0.61 |Q V | | | | 7+10 0.3030 0.62 |Q V | | | | 7+15 0.3073 0.62 |Q V | | | | 7+20 0.3116 0.63 |Q V | | | | 7+25 0.3159 0.63 |Q V | | | | 7+30 0.3203 0.63 |Q V | | | | 7+35 0.3247 0.64 |Q V | | | | 7+40 0.3291 0.64 |Q V | | | | 7+45 0.3335 0.64 |Q V | | | | 7+50 0.3380 0.65 |Q V | | | | 7+55 0.3425 0.65 |Q V | | | | 8+ 0 0.3470 0.66 |Q V | | | | 8+ 5 0.3515 0.66 |Q V | | | | 8+10 0.3561 0.66 |Q V | | | | 8+15 0.3607 0.67 |Q V | | | | 8+20 0.3653 0.67 |Q V | | | | 8+25 0.3700 0.68 |Q V | | | | 8+30 0.3747 0.68 |Q V | | | | 8+35 0.3794 0.69 |Q V | | | | 8+40 0.3842 0.69 |Q V | | | | 8+45 0.3890 0.69 |Q V | | | | 8+50 0.3938 0.70 |Q V | | | | 17 1210
DA1PrSyn100yr24013
8+55 0.3986 0.70 |Q V | | | | 9+ 0 0.4035 0.71 |Q V | | | | 9+ 5 0.4084 0.71 |Q V | | | | 9+10 0.4134 0.72 |Q V | | | | 9+15 0.4184 0.72 |Q V | | | | 9+20 0.4234 0.73 |Q V | | | | 9+25 0.4285 0.74 |Q V | | | | 9+30 0.4336 0.74 |Q V | | | | 9+35 0.4387 0.75 |Q V | | | | 9+40 0.4439 0.75 |Q V | | | | 9+45 0.4491 0.76 |Q V | | | | 9+50 0.4544 0.76 |Q V | | | | 9+55 0.4597 0.77 |Q V | | | | 10+ 0 0.4650 0.78 |Q V | | | | 10+ 5 0.4704 0.78 |Q V | | | | 10+10 0.4759 0.79 |Q V | | | | 10+15 0.4814 0.80 |Q V| | | | 10+20 0.4869 0.80 |Q V| | | | 10+25 0.4925 0.81 |Q V| | | | 10+30 0.4981 0.82 |Q V| | | | 10+35 0.5038 0.82 |Q V| | | | 10+40 0.5095 0.83 |Q V| | | | 10+45 0.5153 0.84 |Q V| | | | 10+50 0.5211 0.85 |Q V| | | | 10+55 0.5270 0.85 |Q V| | | | 11+ 0 0.5330 0.86 |Q V | | | 11+ 5 0.5390 0.87 |Q V | | | 11+10 0.5450 0.88 |Q V | | | 11+15 0.5512 0.89 |Q V | | | 11+20 0.5573 0.90 |Q V | | | 11+25 0.5636 0.91 |Q V | | | 11+30 0.5699 0.92 |Q V | | | 11+35 0.5763 0.93 |Q V | | | 11+40 0.5828 0.94 |Q V | | | 11+45 0.5893 0.95 |Q |V | | | 11+50 0.5959 0.96 |Q |V | | | 11+55 0.6026 0.97 |Q |V | | | 12+ 0 0.6094 0.98 |Q |V | | | 12+ 5 0.6164 1.03 | Q |V | | | 12+10 0.6242 1.13 | Q |V | | | 12+15 0.6322 1.16 | Q |V | | | 12+20 0.6404 1.18 | Q | V | | | 12+25 0.6485 1.19 | Q | V | | | 12+30 0.6569 1.21 | Q | V | | | 12+35 0.6653 1.22 | Q | V | | | 12+40 0.6738 1.24 | Q | V | | | 12+45 0.6824 1.25 | Q | V | | | 12+50 0.6911 1.27 | Q | V | | | 18 1211
DA1PrSyn100yr24013
12+55 0.7000 1.28 | Q | V | | | 13+ 0 0.7090 1.30 | Q | V | | | 13+ 5 0.7181 1.32 | Q | V | | | 13+10 0.7273 1.34 | Q | V | | | 13+15 0.7367 1.36 | Q | V | | | 13+20 0.7462 1.38 | Q | V | | | 13+25 0.7559 1.40 | Q | V | | | 13+30 0.7658 1.43 | Q | V | | | 13+35 0.7758 1.45 | Q | V | | | 13+40 0.7860 1.48 | Q | V | | | 13+45 0.7963 1.51 | Q | V | | | 13+50 0.8069 1.54 | Q | V | | | 13+55 0.8177 1.56 | Q | V | | | 14+ 0 0.8287 1.60 | Q | V | | | 14+ 5 0.8401 1.66 | Q | V | | | 14+10 0.8525 1.80 | Q | V | | | 14+15 0.8652 1.85 | Q | V | | | 14+20 0.8783 1.89 | Q | V | | | 14+25 0.8916 1.93 | Q | V | | | 14+30 0.9053 1.99 | Q | V | | | 14+35 0.9193 2.03 | Q | V | | | 14+40 0.9337 2.09 | Q | V | | | 14+45 0.9484 2.15 | Q | V | | | 14+50 0.9637 2.22 | Q | V | | | 14+55 0.9794 2.28 | Q | V | | | 15+ 0 0.9957 2.37 | Q | V | | | 15+ 5 1.0126 2.45 | Q | V| | | 15+10 1.0302 2.56 | Q | V| | | 15+15 1.0485 2.66 | Q | V| | | 15+20 1.0678 2.80 | Q | V | | 15+25 1.0869 2.78 | Q | V | | 15+30 1.1042 2.51 | Q | V | | 15+35 1.1222 2.62 | Q | |V | | 15+40 1.1422 2.90 | Q | |V | | 15+45 1.1645 3.24 | Q | |V | | 15+50 1.1907 3.80 | Q | | V | | 15+55 1.2225 4.61 | Q| | V | | 16+ 0 1.2664 6.38 | | Q | V | | 16+ 5 1.3501 12.15 | | | QV | | 16+10 1.4824 19.20 | | | V | Q | 16+15 1.5319 7.19 | | Q | V | | 16+20 1.5571 3.67 | Q | | V| | 16+25 1.5770 2.88 | Q | | V| | 16+30 1.5970 2.91 | Q | | V | 16+35 1.6156 2.70 | Q | | V | 16+40 1.6327 2.48 | Q | | V | 16+45 1.6486 2.31 | Q | | |V | 16+50 1.6635 2.17 | Q | | |V | 19 1212
DA1PrSyn100yr24013
16+55 1.6776 2.05 | Q | | |V | 17+ 0 1.6911 1.95 | Q | | |V | 17+ 5 1.7037 1.83 | Q | | | V | 17+10 1.7151 1.66 | Q | | | V | 17+15 1.7259 1.58 | Q | | | V | 17+20 1.7364 1.51 | Q | | | V | 17+25 1.7464 1.46 | Q | | | V | 17+30 1.7562 1.41 | Q | | | V | 17+35 1.7656 1.37 | Q | | | V | 17+40 1.7747 1.33 | Q | | | V | 17+45 1.7836 1.29 | Q | | | V | 17+50 1.7923 1.26 | Q | | | V | 17+55 1.8007 1.22 | Q | | | V | 18+ 0 1.8089 1.19 | Q | | | V | 18+ 5 1.8167 1.13 | Q | | | V | 18+10 1.8237 1.02 | Q | | | V | 18+15 1.8304 0.98 |Q | | | V | 18+20 1.8370 0.95 |Q | | | V | 18+25 1.8434 0.93 |Q | | | V | 18+30 1.8497 0.91 |Q | | | V | 18+35 1.8558 0.89 |Q | | | V | 18+40 1.8618 0.87 |Q | | | V | 18+45 1.8677 0.86 |Q | | | V | 18+50 1.8735 0.84 |Q | | | V | 18+55 1.8792 0.83 |Q | | | V | 19+ 0 1.8848 0.81 |Q | | | V | 19+ 5 1.8903 0.80 |Q | | | V | 19+10 1.8957 0.78 |Q | | | V | 19+15 1.9010 0.77 |Q | | | V | 19+20 1.9063 0.76 |Q | | | V | 19+25 1.9114 0.75 |Q | | | V | 19+30 1.9165 0.74 |Q | | | V | 19+35 1.9215 0.73 |Q | | | V | 19+40 1.9264 0.72 |Q | | | V | 19+45 1.9313 0.71 |Q | | | V | 19+50 1.9361 0.70 |Q | | | V | 19+55 1.9408 0.69 |Q | | | V | 20+ 0 1.9455 0.68 |Q | | | V | 20+ 5 1.9501 0.67 |Q | | | V | 20+10 1.9546 0.66 |Q | | | V | 20+15 1.9591 0.65 |Q | | | V | 20+20 1.9636 0.64 |Q | | | V | 20+25 1.9680 0.64 |Q | | | V | 20+30 1.9723 0.63 |Q | | | V | 20+35 1.9766 0.62 |Q | | | V | 20+40 1.9808 0.62 |Q | | | V | 20+45 1.9850 0.61 |Q | | | V | 20+50 1.9892 0.60 |Q | | | V | 20 1213
DA1PrSyn100yr24013
20+55 1.9933 0.60 |Q | | | V | 21+ 0 1.9974 0.59 |Q | | | V | 21+ 5 2.0014 0.58 |Q | | | V | 21+10 2.0054 0.58 |Q | | | V | 21+15 2.0093 0.57 |Q | | | V | 21+20 2.0132 0.57 |Q | | | V | 21+25 2.0171 0.56 |Q | | | V | 21+30 2.0210 0.56 |Q | | | V | 21+35 2.0248 0.55 |Q | | | V | 21+40 2.0285 0.55 |Q | | | V | 21+45 2.0323 0.54 |Q | | | V | 21+50 2.0360 0.54 |Q | | | V | 21+55 2.0397 0.53 |Q | | | V | 22+ 0 2.0433 0.53 |Q | | | V | 22+ 5 2.0469 0.53 |Q | | | V | 22+10 2.0505 0.52 |Q | | | V | 22+15 2.0541 0.52 |Q | | | V | 22+20 2.0576 0.51 |Q | | | V | 22+25 2.0611 0.51 |Q | | | V | 22+30 2.0646 0.51 |Q | | | V | 22+35 2.0681 0.50 |Q | | | V | 22+40 2.0715 0.50 Q | | | V | 22+45 2.0749 0.49 Q | | | V| 22+50 2.0783 0.49 Q | | | V| 22+55 2.0816 0.49 Q | | | V| 23+ 0 2.0850 0.48 Q | | | V| 23+ 5 2.0883 0.48 Q | | | V| 23+10 2.0916 0.48 Q | | | V| 23+15 2.0948 0.47 Q | | | V| 23+20 2.0981 0.47 Q | | | V| 23+25 2.1013 0.47 Q | | | V| 23+30 2.1045 0.46 Q | | | V| 23+35 2.1076 0.46 Q | | | V| 23+40 2.1108 0.46 Q | | | V| 23+45 2.1139 0.46 Q | | | V| 23+50 2.1171 0.45 Q | | | V| 23+55 2.1202 0.45 Q | | | V| 24+ 0 2.1232 0.45 Q | | | V| 24+ 5 2.1256 0.34 Q | | | V| 24+10 2.1260 0.06 Q | | | V| 24+15 2.1260 0.00 Q | | | V| ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ 21 1214
HYDROLOGY STUDY SEC Riverside Drive and Ontario Avenue, Ontario CA 91761
Hydrology Report
Prepared for Commercial Development
APPENDIX E
Hydraflow Hydrographs Report
1215
1 2
1 Watershed Model Schematic Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Project: stormtech.gpw Monday, 10 / 6 / 2025
Hyd. Origin Description
Legend
1 Manual Post-developed DA1
2 Reservoir routing stormtech
1216
Hydrograph Summary Report
2 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft)
1 Manual 12.57 5 970 58,332 ------ ------ ------ Post-developed DA1 2 Reservoir 0.061 5 1200 681 1 773.10 35,953 routing stormtech stormtech.gpw Return Period: 10 Year Monday, 10 / 6 / 2025 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 1217
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Monday, 10 / 6 / 2025 Hyd. No. 1
Post-developed DA1
Hydrograph type = Manual Peak discharge = 12.57 cfs
Storm frequency = 10 yrs Time to peak = 970 min
Time interval = 5 min Hyd. volume = 58,332 cuft
3 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)
0.00 0.00
2.00 2.00
4.00 4.00
6.00 6.00
8.00 8.00
10.00 10.00
12.00 12.00
14.00 14.00
Q (cfs)
Time (min)
Post-developed DA1
Hyd. No. 1 -- 10 Year
Hyd No. 1
1218
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Monday, 10 / 6 / 2025 Hyd. No. 2
routing stormtech
Hydrograph type = Reservoir P eak discharge = 0.061 cfs Storm frequency = 10 yrs Time to peak = 1200 min
Time interval = 5 min Hyd. volume = 681 cuft
Inflow hyd. No. = 1 - Post-dev eloped DA1 Max. Elevation = 773.10 ft Reservoir name = MC-4500 Stor mtech Max. Storage = 35,953 cuft Storage Indication method used. Exfiltration extracted from Outflow. 4 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)
0.00 0.00
2.00 2.00
4.00 4.00
6.00 6.00
8.00 8.00
10.00 10.00
12.00 12.00
14.00 14.00
Q (cfs)
Time (min)
routing stormtech
Hyd. No. 2 -- 10 Year
Hyd No. 2 Hyd No. 1
Total storage used = 35,953 cuft
1219
Pond Report 5
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Monday, 10 / 6 / 2025 Pond No. 1 - MC-4500 Stormtech
Pond Data
UG Chambers -Invert elev. = 769.45 ft, Rise x Span = 4.65 x 7.24 ft, Barrel Len = 150.00 ft, No. Barrels = 8, Slope = 0.00%, Headers = No Encasement -Invert elev. = 768.70 ft, Width = 9.08 ft, Height = 6.75 ft, Voids = 40.00% Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cuft) Total storage (cuft)
0.00 768.70 n/a 0 0
0.68 769.38 n/a 2,943 2,943
1.35 770.05 n/a 6,062 9,004
2.03 770.72 n/a 6,387 15,391
2.70 771.40 n/a 6,240 21,631
3.38 772.08 n/a 6,002 27,633
4.05 772.75 n/a 5,648 33,281
4.72 773.42 n/a 5,122 38,403
5.40 774.10 n/a 4,179 42,582
6.08 774.78 n/a 2,943 45,524
6.75 775.45 n/a 2,943 48,467
Culvert / Orifice Structures Weir Structures
[A] [B] [C] [PrfRsr] [A] [B] [C] [D]
Rise (in) = 18.00 0.00 0.00 0.00
Span (in) = 18.00 0.00 0.00 0.00
No. Barrels = 1 000
Invert El. (ft) = 773.00 0.00 0.00 0.00
Length (ft) = 48.00 0.00 0.00 0.00
Slope (%) = 2.10 0.00 0.00 n/a
N-Value = .013 .013 .013 n/a
Orifice Coeff. = 0.60 0.60 0.60 0.60
Multi-Stage = n / a N oN oN o
Crest Len (ft) = 0.00 0.00 0.00 0.00
Crest El. (ft) = 0.00 0.00 0.00 0.00
Weir Coeff. = 3.33 3.33 3.33 3.33
Weir Type = --- --- --- ---
Multi-Stage = No No No No
Exfil.(in/hr) = 0.720 (by Wet area)
TW Elev. (ft) = 0.00
Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s).
Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv B Clv C PrfRsr Wr A Wr B Wr C Wr D Exfil User Total ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
0.00 0 768.70 0.00 --- --- --- --- --- --- --- 0.000 --- 0.000
0.68 2,943 769.38 0.00 --- --- --- --- --- --- --- 0.209 --- 0.209
1.35 9,004 770.05 0.00 --- --- --- --- --- --- --- 0.236 --- 0.236
2.03 15,391 770.72 0.00 --- --- --- --- --- --- --- 0.263 --- 0.263
2.70 21,631 771.40 0.00 --- --- --- --- --- --- --- 0.290 --- 0.290
3.38 27,633 772.08 0.00 --- --- --- --- --- --- --- 0.317 --- 0.317
4.05 33,281 772.75 0.00 --- --- --- --- --- --- --- 0.344 --- 0.344
4.72 38,403 773.42 0.92 ic --- --- --- --- --- --- --- 0.371 --- 1.286
5.40 42,582 774.10 4.96 ic --- --- --- --- --- --- --- 0.398 --- 5.361
6.08 45,524 774.78 8.61 ic --- --- --- --- --- --- --- 0.425 --- 9.038
6.75 48,467 775.45 11.09 ic --- --- --- --- --- --- --- 0.452 --- 11.54 1220
Hydrograph Summary Report
6 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft)
1 Manual 19.20 5 970 92,610 ------ ------ ------ Post-developed DA1 2 Reservoir 8.788 5 975 31,614 1 774.82 45,708 routing stormtech stormtech.gpw Return Period: 100 Year Monday, 10 / 6 / 2025 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 1221
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Monday, 10 / 6 / 2025 Hyd. No. 1
Post-developed DA1
Hydrograph type = Manual Peak discharge = 19.20 cfs
Storm frequency = 100 yrs Time to peak = 970 min
Time interval = 5 min Hyd. volume = 92,610 cuft
7 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)
0.00 0.00
3.00 3.00
6.00 6.00
9.00 9.00
12.00 12.00
15.00 15.00
18.00 18.00
21.00 21.00
Q (cfs)
Time (min)
Post-developed DA1
Hyd. No. 1 -- 100 Year
Hyd No. 1
1222
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Monday, 10 / 6 / 2025 Hyd. No. 2
routing stormtech
Hydrograph type = Reservoir P eak discharge = 8.788 cfs Storm frequency = 100 yrs Time to peak = 975 min
Time interval = 5 min Hyd. volume = 31,614 cuft
Inflow hyd. No. = 1 - Post-dev eloped DA1 Max. Elevation = 774.82 ft Reservoir name = MC-4500 Stor mtech Max. Storage = 45,708 cuft Storage Indication method used. Exfiltration extracted from Outflow. 8 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs)
0.00 0.00
3.00 3.00
6.00 6.00
9.00 9.00
12.00 12.00
15.00 15.00
18.00 18.00
21.00 21.00
Q (cfs)
Time (min)
routing stormtech
Hyd. No. 2 -- 100 Year
Hyd No. 2 Hyd No. 1
Total storage used = 45,708 cuft
1223
Hydraflow Table of Contents stormtech.gpw
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2025 Monday, 10 / 6 / 2025 Watershed Model Schematic...................................................................................... 1 10 - Year
Summary Report......................................................................................................................... 2 Hydrograph Reports................................................................................................................... 3 Hydrograph No. 1, Manual, Post-developed DA1.................................................................... 3 Hydrograph No. 2, Reservoir, routing stormtech...................................................................... 4 Pond Report - MC-4500 Stormtech..................................................................................... 5 100 - Year
Summary Report......................................................................................................................... 6 Hydrograph Reports................................................................................................................... 7 Hydrograph No. 1, Manual, Post-developed DA1.................................................................... 7 Hydrograph No. 2, Reservoir, routing stormtech...................................................................... 8 1224
HYDROLOGY STUDY SEC Riverside Drive and Ontario Avenue, Ontario CA 91761
Hydrology Report
Prepared for Commercial Development
APPENDIX F
Existing Hydrology Map – Synthetic Unit Hydrograph Method Post-developed Hydrology Map – Synthetic Unit Hydrograph Method Post-developed Hydrology Map – Rational Method
1225
785
780
780
775
775
775
775
782.8
781.4
780.9 781.3
781.5
780.6
780.7
782.2
779.4
778.5
776.7 778.3
778.3
777.8
776.6
775.9
776.6
776.3
775.7
775.9
774.5
773.9
775.2
775.2
774.2
775.2
773.3
776.8
774.2
A STREET
RIVERSIDE DR
C STREET
CHAMPION AVE
E:\PROJECTS\24-013 Marriott Hotel (near Stadium) Ontario CA\PG
REVISIONS
DATEMARK BY DESCRIPTION
DESIGNED BY:
DATE: 06/10/2025
DA
DRAWN BY:
DATE: 06/10/2025
PS
CHECKED BY:
DATE:
SHEET
CONTRACT
ACCOUNT
DWG. NO.
OF 07
RECOMMENDED BY:
APPROVED BY: KHOI DO P.E., CITY ENGINEER
BRYAN LIRLEY P.E., ASSISTANT CITY ENGINEER DATE
DATE
C I T Y O F O N T A R I O ALOFT-RESIDENCE INN HOTEL
PRE-DEVELOPED HYDROLOGY MAP
SYNTHETIC UNIT HYDROGRAPH METHOD
01 03
1226
T
T
MAIN ELEC
BOILER
PATIO
POOL
RESTROOMS
EQUIP
EVENT AREA
SPA
CAFE-RETAIL
LEGENDS ATTIC
CONFERENCE
IRRIGATION BACKFLOW
YOGURT - LAND
IRRIGATION
CONTROLLER
KID POOL
OUTDOOR
EXERCISE
ALOFT + RESIDENCE INN
5 STORY HOTEL
(PARCEL 1)
SD
SD
SD
SD
125+00 126+00 127+00 128+00 129+00 130+00 131+00 131+16 120+00 121+00 122+00 123+00
124+00 125+00 126+00 126+81
21+0021+04
21+11 22+00 23+00 24+00 25+00 26+00 26+32
77+00 78+00 79+00 80+00 81+00 82+00 83+00
CHAMPION AVE
A STREET
RIVERSIDE DR
C STREET
777.70 FFE
E:\PROJECTS\24-013 Marriott Hotel (near Stadium) Ontario CA\PG
REVISIONS
DATEMARK BY DESCRIPTION
DESIGNED BY:
DATE: 06/10/2025
DA
DRAWN BY:
DATE: 06/10/2025
PS
CHECKED BY:
DATE:
SHEET
CONTRACT
ACCOUNT
DWG. NO.
OF 07
RECOMMENDED BY:
APPROVED BY: KHOI DO P.E., CITY ENGINEER
BRYAN LIRLEY P.E., ASSISTANT CITY ENGINEER DATE
DATE
C I T Y O F O N T A R I O ALOFT-RESIDENCE INN HOTEL
POST-DEVELOPED HYDROLOGY MAP
SYNTHETIC UNIT HYDROGRAPH METHOD
02 03
1227
SD
SD
T
T
MAIN ELEC
BOILER
PATIO
POOL
RESTROOMS
EQUIP
EVENT AREA
SPA
CAFE-RETAIL
LEGENDS ATTIC
CONFERENCE
IRRIGATION BACKFLOW
YOGURT - LAND
IRRIGATION
CONTROLLER
KID POOL
OUTDOOR
EXERCISE
ALOFT + RESIDENCE INN
5 STORY HOTEL
(PARCEL 1)
125+00 126+00 127+00 128+00 129+00 130+00 131+00 131+16 120+00
121+00 122+00 123+00 124+00 125+00 126+00 126+81
21+0021+04
21+11 22+00 23+00 24+00 25+00 26+00 26+32
77+00 78+00 79+00 80+00 81+00 82+00 83+00
777.70 FFE
A STREET
RIVERSIDE DR
C STREET
SD
SD
CHAMPION AVE
E:\PROJECTS\24-013 Marriott Hotel (near Stadium) Ontario CA\PG
REVISIONS
DATEMARK BY DESCRIPTION
DESIGNED BY:
DATE: 06/10/2025
DA
DRAWN BY:
DATE: 06/10/2025
PS
CHECKED BY:
DATE:
SHEET
CONTRACT
ACCOUNT
DWG. NO.
OF 07
RECOMMENDED BY:
APPROVED BY: KHOI DO P.E., CITY ENGINEER
BRYAN LIRLEY P.E., ASSISTANT CITY ENGINEER DATE
DATE
C I T Y O F O N T A R I O ALOFT-RESIDENCE INN HOTEL 03 03 1228
Project Information:
Project Name: Marriott Hotel
Location: Hellman Avenue, Ontario CA
Date: 06-10-2025
Engineer: Deepak
StormTech RPM:
MC-4500 Site Calculator
System Requirements System Sizing
Units Imperial Number of Chambers Required 288 each
Required Storage Volume 48500 CF Number of End Caps Required 16 each Stone Porosity (Industry Standard = 40%) 40 % Bed Size (including perimeter stone) 11,236 square feet Stone Above Chambers (12 inch min.) 12 inches Stone Required (including perimeter stone) 2342 tons Stone Foundation Depth (9 inch min.) 9 inches Volume of Excavation 3225 cubic yards Average Cover over Chambers (24 inch min.) 24 inches Non-woven Filter Fabric Required (20% Safety Factor) 3403 square yards Bed size controlled by WIDTH or LENGTH? WIDTH Length of Isolator Row 152.0 feet Limiting WIDTH or LENGTH dimension 75 feet Woven Isolator Row Fabric (20% Safety Factor) 418 square yards Storage Volume per Chamber 162.6 CF
Storage Volume per End Cap 108.6 CF Installed Storage Volume 48,566 cubic feet 24 Maximum Width = 75 feet inches
8 rows of 36 chambers 12
inches
Maximum Length = 152.0 feet
Maximum Width = 73.9 feet
9 inches
Controlled by Width (Rows)
60"
(1524 mm)
24"
(610 mm)
MIN.
7.0'
(2.13 m)
MAX.
100" (2540 mm)
1229
TECHNICAL MEMORANDUM
DATE November 17, 2025
TO Tracy Chu, Project Manager
T&B Planning
ADDRESS 3200 El Camino Real, Suite 100
Irvine, CA 92602
FROM Nicole Vermilion, Principal
Lance Park, Senior Associate II
Chris Shields, Senior Associate II
Lexie Zimny, Associate I
SUBJECT Noise & Vibration Technical Memorandum for Hotel Ontario Aloft + Residence Inn Project
PROJECT NUMBER T&B-02
PlaceWorks’ technical staff has prepared a noise and vibration memorandum to support the environmental documentation required under the California Environmental Quality Act (CEQA) for the proposed amendments to the Ontario Regional Sports Complex and Hotel Ontario Aloft + Residence Inn Project (together referred to as the “Proposed Project”) compared to the previously approved Ontario Regional Sport Complex (ORSC ).
Project Background and Prior Environmental Analysis
This memorandum was prepared to support an Addendum to the previously approved ORSC Environmental Impact Report (Certified EIR) (State Clearinghouse [SCH] No. 2023110328) for the Proposed Project. The memorandum has been prepared in accordance with the provisions of Section 21166 of the CEQA statute and Sections 15162 and 15164 of the CEQA Guidelines.
The land use plan for the ORSC (Approved Project) designates land uses within seven planning areas (PA) —Baseball Stadium (PA 1), Commercial Retail (PA 2), Baseball Stadium Retail-Hospitality (PA 3), Baseball Stadium Retail- Hospitality South (PA 4), City Park–Active Fields (PA 5), City Park–Indoor Athletic Facility (PA 6), and Community Recreation Center (PA 7). The Approved Project allows for up to 540,750 square feet of commercial building space, 450,000 square feet of stadium space (110,000 square feet of conditioned space and 340,000 square feet of unconditioned space), and 272,000 square feet of parking structures on the 199-gross-acre site. The EIR for the ORSC was certified in August 2024.
CERTIFIED EIR MITIGATION MEASURES
The Certified EIR determined that the following noise mitigation measures would be applicable to future individual projects under the Approved Project on PA 2, 3, and 4.
1230
November 17, 2025 | Page 2
N-1 The construction contractor shall implement the following measures during construction activities on the ORSC site and Offsite Improvement Area. These measures shall be identified on demolition, grading, and/or building permits.
Prior to construction activities that warrant nighttime construction (e.g., infrastructure work, concrete pours, etc.), the construction contractor shall install noise pathway controls, including noise barriers and enclosures free from gaps and holes, which shall be placed as close as possible to construction areas. The temporary noise barrier shall be a sufficient height to block the direct line-of-sight between the on-site construction areas and off-site noise sensitive receptors and shall be a minimum of 6 feet tall and shall be constructed out of wood or other materials with a minimum surface weight of approximately 2.5 pounds per square foot. Construction equipment operating on a site shall be equipped with the appropriate manufacturer’s noise reduction devices, including but not limited to a manufacturer’s muffler (or equivalently rated material) that is free of rust, holes, and exhaust leaks. Noise from construction devices with internal combustion engines shall be mitigated by ensuring that the engine's housing doors are kept closed, and by using noise-insulating material mounted on the engine housing that does not interfere with the manufacturer's guidelines for engine operation or exhaust.
Portable compressors, generators, pumps, and other such devices shall be covered with noise- insulating fabric to the maximum extent possible that does not interfere with the manufacturer's guidelines for engine operation or exhaust, and shall further reduce noise by operating the device at lower engine speeds during the work to the maximum extent possible. Idling on-site of heavy-duty diesel vehicles with Gross Vehicle Weight Rating of 10,000 pounds shall be limited to no longer than five minutes while parking, standing, or stopping, as per 13 California Code of Regulations Section 2485, Airborne Toxic Control Measure to Limit Diesel-Fueled Commercial Motor Vehicle Idling.
Quieter back-up alarms on construction equipment shall be used whenever feasible. Construction vehicles shall be strategically positioned to minimize operation near receptors and avoiding tailgate slamming to the extent possible.
N-2 HVAC Equipment, Planning Area 6 Indoor Athletic Facility Building. An acoustics study shall be provided to the City of Ontario prior to building permit issuance for the indoor athletic facility in Planning Area 6 that documents compliance with the overnight noise levels in the City’s municipal code (45 dBA at single-family residences from 10:00 pm to 7:00 am). HVAC equipment for the indoor athletic facility shall be designed and/or placed to yield a sound level less than 58 dBA at 50 feet. Noise associated with operation of heating and cooling equipment shall be minimized by the design and strategic placement of equipment.
N-3 HVAC Equipment, Planning Areas 2, 3, 4, and 7 Buildings. An acoustics study shall be provided to the City of Ontario prior to building permit issuance for new structures with HVAC systems in Planning Areas 2, 3, 4, and 7 that documents compliance with the overnight noise levels in the City’s municipal code (45 dBA at single-family residences from 10:00 pm to 7:00 am). HVAC equipment for the indoor athletic facility shall be designed and/or placed to yield a sound level less than 65 dBA at 50 feet to ensure compliance would result in a noise level of approximately 44 dBA at residential land uses to the east along Plymouth Avenue. Noise associated with operation of heating and cooling equipment shall be minimized by the design and strategic placement of equipment.
1231
November 17, 2025 | Page 3
Project Location
The ORSC is in the southern portion of Ontario, which is known as the Ontario Ranch. The ORSC site is bounded to the north by Riverside Drive, to the south by Chino Avenue, to the west by the unimproved right -of-way (ROW) for Vineyard Avenue, and to the east by the Cucamonga Creek Flood Control Channel. The Proposed Project, which covers PAs 2 through 4 of the ORSC, is largely concentrated in the northeastern portion of the ORSC. PA 2 and PA 3 border Riverside Drive; PA 2 borders the Cucamonga Creek Flood Control Channel; and PA 4 is bordered by PAs 2, 3, and 5.
The proposed hotel and retail building (Aloft & Residence Inn) is in a 3.41-acre portion of PA 2 of the ORSC. This site encompasses three assessor’s parcel numbers (APNs): 0218-111-12-0-000, 0218-111-49-0-000, and 0218-111-50-0- 000. This site has a General Plan designation of Hospitability (HOS) and a zoning designation of Convention Center Support Commercial (CCS). The site is bounded by Riverside Drive to the north, Hellman Avenue and the baseball stadium of PA 1 to the west, A Street and the Cucamonga Flood Control Channel to the east, and C Street to the south.
Project Description
The Proposed Project encompasses the amendments to the ORSC to relocate and reconfigure the hotel and retail building space across PAs 2 through 4 as well as construction and operation of the proposed Aloft & Residence Inn Hotel in PA 2. As shown in Table 1, Approved Project and Proposed Project Comparison, across all three PAs, the hotel space would increase from 70,000 square feet with 100 rooms to up to 170,000 square feet with 249 rooms, and the retail building space would diminish from 180,000 square feet to 72,144 square feet, resulting in a net decrease of building space—from 250,000 square feet to 242,144 square feet—across all retail and hotel uses in those three PAs.
The proposed Aloft & Residence Inn is a five-story hotel complex consisting of 249 rooms across the second through fifth floors and a retail/conference area on the first floor. The retail/conference area would include conference rooms, a “hall of fame” area, a Yogurtland, and a café. A courtyard on the first floor of the hotel would consist of a patio, three pool areas, and an event area with artificial turf. The total proposed Aloft & Residence Inn building is anticipated to consist of up to 195,700 square feet. The proposed Aloft & Residence Inn would also have two parking areas with a total of 197 parking stalls and an off-site sidewalk improvement.
Table 1 Approved Project and Proposed Project Comparison Land Use Approved Project Proposed Project Difference
PA 2 Commercial Retail
Retail/Commercial, East 45,000 Sq Ft 25,631 Sq Ft -19,369 Sq Ft Hotel 0 Sq Ft 170,000 Sq Ft
249 Rooms
170,000 Sq Ft
249 Rooms
PA 3 Baseball Stadium Retail Stadium Retail and Hospitality Retail/Commercial 21,000 Sq Ft 10,000 Sq Ft -11,000 Sq Ft Hotel 70,000 Sq Ft
100 Rooms
0 Sq Ft
0 Rooms
-70,000 Sq Ft
-100 Rooms
PA 4 Baseball Stadium Retail and Hospitality South
Retail/Commercial 114,000 Sq Ft 36,513 Sq Ft -77,487 Sq Ft 1232
November 17, 2025 | Page 4
Table 1 Approved Project and Proposed Project Comparison Land Use Approved Project Proposed Project Difference
TOTAL Retail Space 180,000 Sq Ft 72,144 Sq Ft -107,856 Sq Ft TOTAL Hotel Space 70,000 Sq Ft
100 Rooms
170,000 Sq Ft
249 Rooms
100,000 Sq Ft
149 Rooms
TOTAL Building Space PAs 2 to 4 250,000 Sq Ft
100 Rooms
242,144 Sq Ft
249 Rooms
-7,856 Sq Ft
149 Rooms
Environmental Setting
NOISE FUNDAMENTALS
Noise is defined as unwanted sound and, when overexposed, is known to have several adverse effects on people, including hearing loss, speech and sleep interference, physiological responses, and annoyance. Based on these known adverse effects of noise, state and city governments have established criteria to protect public health and safety and to prevent the disruption of certain human activities, such as classroom instruction, communication, or sleep.
Noise Terminology
» Sound. A disturbance created by a vibrating object, which, when transmitted by pressure waves through a medium such as air, is capable of being detected by a receiving mechanism, such as the human ear or a microphone.
» Noise. Sound that is loud, unpleasant, unexpected, or otherwise undesirable. » Decibel (dB). A unitless measure of sound on a logarithmic scale. » A-Weighted Decibel (dBA). An overall frequency-weighted sound level in decibels that approximates the frequency response of the human ear.
» Equivalent Continuous Noise Level (Leq); also called the Energy -Equivalent Noise Level. The value of an equivalent, steady sound level which, in a stated time period (often over an hour) and at a stated location, has the same A-weighted sound energy as the time-varying sound. Thus, the Leq metric is a single numerical value that represents the equivalent amount of variable sound energy received by a receptor over the specified duration.
» Statistical Sound Level (Ln). The sound level that is exceeded “n” percent of time during a given sample period.
For example, the L50 level is the statistical indicator of the time-varying noise signal that is exceeded 50 percent of the time (during each sampling period); that is, half of the sampling time, the changing noise levels are above this value and half of the time they are below it. This is called the “median sound level.” The L10 level, likewise, is the value that is exceeded 10 percent of the time (i.e., near the maximum) and this is often known as the “intrusive sound level.” The L90 is the sound level exceeded 90 percent of the time and is often considered the “effective background level” or “residual noise level.” 1233
November 17, 2025 | Page 5
» Day-Night Sound Level (DNL). The energy-average of the A-weighted sound levels occurring during a 24-hour period, with 10 dB added to the sound levels occurring during the period from 10:00 pm to 7:00 am. » Community Noise Equivalent Level (CNEL). The energy average of the A-weighted sound levels occurring during a 24-hour period, with 5 dB added from 7:00 pm to 10:00 pm and 10 dB from 10:00 pm to 7:00 am. For general community/environmental noise, CNEL and DNL values rarely differ by more than 1 dB (with the CNEL being only slightly more restrictive, that is, higher than the Ldn value). As a matter of practice, DNL and CNEL values are interchangeable and are treated as equivalent in this assessment. » Sensitive Receptor. Noise- and vibration-sensitive receptors include land uses where quiet environments are necessary for enjoyment and public health and safety. Residences, schools, motels and hotels, libraries, religious institutions, hospitals, and nursing homes are examples. » Peak Particle Velocity (PPV). The peak rate of speed at which soil particles move (e.g., inches per second) due to ground vibration.
» Vibration Decibel (VdB). A unitless measure of vibration, expressed on a logarithmic scale and with respect to a defined reference vibration velocity. In the U.S., the standard reference velocity is 1 micro-inch per second (1x10- 6 in/sec).
EXISTING NOISE ENVIRONMENT
The Proposed Project involves PAs 2 through 4 of the ORSC. The primary noise source for this portion of the ORSC is traffic noise on Riverside Drive, located north of these PAs. Noise measurements conducted in October 2023 for the Certified EIR measured noise levels at the Cucamonga Creek Channel adjacent to PA 2 and at South Whispering Lakes Lane approximately 1,400 feet northwest of PA 3. The 24-hour noise level measured at the Cucamonga Creek Channel was 59 dBA CNEL, and the average hourly Leq during the daytime was 52 dBA Leq. The 24-hour noise level at South Whispering Lakes Lane was 58 dBA CNEL, and the average hourly Leq during the daytime was 53 dBA Leq.
Existing traffic noise modeled for the Certified EIR estimated that traffic noise at the Whispering Lake Golf Course north of the ORSC was between 47 and 73 dBA CNEL, and traffic noise along the Cucamonga Creek Channel was between 36 and 67 dBA CNEL.
SENSITIVE RECEPTORS
Certain land uses are particularly sensitive to noise and vibration. These uses include residences, schools, hospital facilities, houses of worship, and open space/recreation areas where quiet environments are necessary for the enjoyment, public health, and safety of the community. The nearest receptors to the ORSC PAs involved in the Proposed Project are the residences east of the ORSC on Plymouth Avenue, approximately 140 feet east of PA 2.
The backyards of these residences have an approximately 6-foot concrete sound wall that runs along the western boundary of the residences. These receptors were referred to within the noise analysis of the Certified EIR as Receptor Group 5. Figure 5.13-2, Noise-Sensitive Receptor Groups, in the Certified EIR (see Attachment A) shows the location and boundaries of all receptor groups analyzed in the Certified EIR. 1234
November 17, 2025 | Page 6
Applicable Standards
STATE NOISE REGULATIONS
California Building Code
The California Building Code (CBC) (California Code of Regulations Title 24, Part 2), Volume 1, Chapter 12, Section 1207.11.2, Allowable Interior Noise Levels, requires interior noise levels attributable to exterior sources to not exceed 45 dBA in any habitable room. The noise metric is evaluated as either the day -night average sound level (Ldn) or the community noise equivalent level (CNEL), whichever is consistent with the noise element of the local general plan.
The California Green Building Standards Code (CALGreen) has requirements for insulation that affects exterior - interior noise transmission for nonresidential structures. Pursuant to CALGreen Section 5.507.4, Acoustical Control, an architectural acoustics study may be required when a project site is within a 65 dBA CNEL or L dn noise contour of an airport, freeway or expressway, railroad, industrial source, or fixed-guideway source. Where noise contours are not readily available, if buildings are exposed to a noise level of 65 dBA Leq during any hour of operation, specific wall and ceiling assembly and sound-rated windows may be necessary to reduce interior noise to acceptable levels .
LOCAL NOISE REGULATIONS
The Ontario Plan
The Ontario Plan 2050 safety element is designed to limit excessive community noise exposure through effective and guided land use compatibility planning. Table 2, Ontario Noise Level Exposure and Land Use Compatibility Guidelines, summarizes the City of Ontario’s standards to facilitate land use compatibility regarding existing and future noise levels.
Table 2 Ontario Noise Level Exposure and Land Use Compatibility Guidelines Categories Uses
CNEL (dBA)
Clearly
Acceptable1
Normally
Acceptable2
Normally
Unacceptable3
Clearly
Unacceptable4
Residential/Lodging
Single Family/Duplex <60 60-65 65-70 70-85
Multifamily <60 60-65 65-75 75-85
Mobile Homes <60 60-65 - 65-85
Hotel/Motel <65 65-70 70-80 80-85
Public/Institutional
Schools/Hospitals <60 60-65 65-70 70-85
Churches/Libraries <60 60-65 65-70 70-85
Auditoriums/Concert
Halls <55 55-60 60-70 70-85
Commercial
Offices <65 65-75 75-80 80-85
Retail <70 70-75 75-80 80-85
Industrial Manufacturing <70 70-75 75-85 -
1235
November 17, 2025 | Page 7
Table 2 Ontario Noise Level Exposure and Land Use Compatibility Guidelines Categories Uses
CNEL (dBA)
Clearly
Acceptable1
Normally
Acceptable2
Normally
Unacceptable3
Clearly
Unacceptable4
Warehousing <70 70-80 80-85 -
Recreational/Open
Space
Parks/Playgrounds <65 65-70 70-75 75-85
Golf Course/Riding
Stables <65 65-70 70-75 75-85
Outdoor Spectator
Sports <60 60-65 65-70
Outdoor Music
Shells/Amphitheaters - <60 60-65 65-85
Livestock/Wildlife
Preserves <70 - 70-75 75-85
Crop Agriculture <55-85 - - -
Source: Ontario 2022a.
1 No special noise insulation required, assuming buildings of normal conventional construction. 2 Acoustical reports will be required for major new residential construction. Conventional construction with closed windows and fresh air supply systems of air conditioning will normally suffice. 3 New construction should be discouraged. Noise/aviation easements required for all new construction. If new construction does proceed, a detailed analysis of noise reduction requirements must be made, and necessary noise insulation features included.
4 No new construction should be permitted.
Ontario Municipal Code
The City of Ontario Municipal Code establishes both exterior and interior noise standards for various land use types grouped into “noise zones.” Maximum permissible noise level limits are established for each noise zone from 7:00 am to 10:00 pm and 10:00 pm to 7:00 am, based on the Leq metric and a duration of 15 minutes. Pursuant to Section 5-29.04, Exterior Noise Standards, the ambient noise level shall be the standard if it exceeds the established permissible limit at any time in any zone. The code also establishes a maximum instantaneous (Lmax) permissible noise level, which is the established noise standard for the applicable zone plus 20 dBA during any period, measured in A-weighting on slow response.
The limits established for Noise Zone I, single-family residential, also apply to the exterior of schools, daycare centers, hospitals or similar healthcare institutions, churches, libraries, or museums during hours of use. Table 3, Ontario Municipal Code Exterior Noise Standards, summarizes the allowable exterior noise level limits of Section 5-
29.04(a).
1236
November 17, 2025 | Page 8
Table 3 Ontario Municipal Code Exterior Noise Standards Noise Zone Land Use
Allowable Equivalent Noise Level, Leq (dBA)
7:00 am–10:00 pm 10:00 pm–7:00 am
I Single-Family Residential 65 45
II Multi-Family Residential,
Mobile Home Parks
65 50
III Commercial Property 65 60
IV Residential Portion of Mixed Use 70 70
V Manufacturing and Industrial, Other Uses 70 70
Source: Ontario Municipal Code Section 5-29.04.
1 If the ambient level exceeds the standard, the ambient noise level shall be the standard. 2 Compliance is determined on the affected property.
3 Noise standards are based on a 15-min Leq.
4 Maximum instantaneous noise levels (Lmax) equal to the noise standard limit plus 20 dBA shall not be exceeded at any time, measured using A-weighted with the meter set to slow response. However, if ambient exceeds the standard, the standard shall be increased to reflect the maximum ambient noise level. 5 Noise Zone I noise standards also apply to the exterior of schools, daycare centers, hospitals or other similar healthcare institutions, churches, libraries, or museums during hours of use. 6 Noise Zone IV applies to the portion of the residential property within 100 feet of a commercial property or use, if the noise originates from the commercial property or use. 7 If the compliance location is on the boundary of two different noise zones, the lower noise level standard shall apply.
EXEMPTIONS
Section 5-29.06 of the City’s noise code exempts various sources of noise, some of which are applicable to the Proposed Project.
» Activities on public or private property conducted by any public entity or its authorized representatives, including sporting and recreational activities that are sponsored, co-sponsored, permitted, or allowed by the City. This also includes sporting and e ntertainment events conducted pursuant to an approval, authorization, contract, lease, permit, or sublease by the appropriate public entity, specifically the planning commission or city council. » Noise sources associated with construction, repair, remodeling, demolition, or grading of any real property, because construction activities are instead subject to the provisions of Section 5 -29.09. » Noise sources associated with the maintenance of real property. Such activities shall instead be subject to the provisions of Section 5-29.08.
» Activities regulated by state or federal law.
Property Maintenance
Pursuant to Section 5-29.08 of the City’s noise code, noise from maintenance of property shall not produce a disturbance to those who work or reside in the vicinity of the source, except between the hours of 8:00 am and 6:00 1237
November 17, 2025 | Page 9
pm. In addition, landscaping and maintenance activities are generally restricted to specific times during weekdays and on weekends. These provisions do not apply to any maintenance that meets the noise limits established in Section 5-29.04. In addition, the maintenance, repair, or improvement of any public work or facility by public employees is exempt as long as the city manager determines maintenance and repair is immediately necessary, cannot be feasibly conducted during normal business hours, or the city council has an approved project specification or an environmental document authorizing maintenance during hours otherwise prohibited by Section 5 -29.08.
Thresholds of Significance
CONSTRUCTION NOISE
Because the City does not have construction noise level limits, construction noise was assessed using criteria from the Transit Noise and Vibration Impact Assessment Manual (FTA 2018). The Certified EIR also utilized the City of Los Angeles’ CEQA guidance to assess construction noise impacts for nighttime construction activities, as discussed in Section 5.13, Noise, of the Certified EIR.
Table 4, General Assessment Construction Noise Criteria, shows the Federal Transit Administration’s (FTA) detailed analysis construction noise criteria based on the composite noise levels of the two noisiest pieces of equipment per construction phase. This provides reasonable criteria for assessing construction noise impacts based on the potential for adverse community reaction when the noise criteria are exceeded.
Table 4 General Assessment Construction Noise Criteria Land Use
Daytime 8-Hour Leq
(dBA)
Nighttime 8-Hour
Leq (dBA) 30-Day Average Ldn (dBA)
Residential 80 70 751
Commercial 85 85 802
Industrial 90 90 852
Source: FTA 2018.
Notes: “Daytime” is defined as 7 am to 10 pm, and “Nighttime” is defined as 10 pm to 7 am. dBA = A-weighted decibels
Leq = equivalent continuous sound level
Ldn = day night average sound level
1 In urban areas with very high ambient noise levels (Ldn greater than 65 dB), Ldn from construction operations should not exceed existing ambient + 10 dB.
2 24-hour Leq, not Ldn.
In order to assess construction noise impacts that would occur during nighttime hours, the Certified EIR used the City of Los Angeles’s nighttime construction noise threshold:
» Nighttime Construction. For construction activities between 7 pm and 7 am Monday through Friday, between 6 pm and 8 am on Saturdays, and anytime on Sundays or national holidays, noise levels at sensitive uses would not exceed 5 dBA above the ambient noise level at the receptor. Concrete m at pour activities (and other types of concrete pour that require an extended continuous pour beyond the allowable construction hours) that are required to occur during nighttime hours for less than five days are exempt from this provision. 1238
November 17, 2025 | Page 10
TRAFFIC NOISE
A project will normally have a significant effect on the environment related to traffic noise if it substantially increases the ambient noise levels for adjoining areas. Most people can detect changes in sound levels of approximately 3 dBA under normal, quiet conditions, and changes of 1 to 3 dBA under quiet, controlled conditions.
Changes of less than 1 dBA are usually indiscernible. A change of 5 dBA is readily discernible to most people in an outdoor environment. Noise levels above 65 dBA CNEL are normally unacceptable at sensitive receptor locations such as residences, and noise environments in these areas would be considered degraded. Based on this, a significant impact would occur if the following traffic noise increases occur relative to the existing noise environment:
» 1.5 dBA in ambient noise environments of 65 dBA CNEL and higher » 3 dBA in ambient noise environments of 60 to 64 dBA CNEL » 5 dBA in ambient noise environments of less than 60 dBA CNEL Based on existing traffic noise modeling, a significant traffic noise impact occurs when the thresholds above are exceeded under cumulative conditions (with project) and the contribution of the proposed project to future traffic is calculated to be greater than 3 dBA CNEL for Riverside Drive.
OPERATIONAL NOISE
The standards in the Ontario Municipal Code provide the thresholds for analyzing stationary noise impacts of the Proposed Project. Pursuant to Section 5-29.11 of the Ontario Municipal Code, the maximum allowable daytime exterior noise level for single-family residential uses is 65 dBA Leq and the nighttime level is 45 dBA Leq (see Table 3).
VIBRATION
The City of Ontario does not have a quantified threshold for temporary construction vibration. Therefore, to determine impact significance, FTA criteria are used. A vibration impact would occur if vibration levels exceed 0.20 inches/second (in/sec) peak particle velocity (PPV) at the façade of a non-engineered structure (e.g., wood-frame residential). Additionally, the FTA’s threshold of 78 vibration velocity (VdB) at residential uses during daytime hours will be used to assess vibration annoyance at the nearby sensitive receptors.
Environmental Impact
SUMMARY OF IMPACTS IDENTIFIED IN THE CERTIFIED EIR
The following summarizes the approved project’s environmental impacts related to noise identified in the Certified EIR.
» Construction Noise. The Certified EIR analyzed noise impacts from construction activities anticipated during the daytime and nighttime with respect to five receptor groups in the vicinity of the ORSC site. Daytime noise levels at all receptor group locations were found to not exceed the FTA’s Leq 8- hour noise level limit of 80 dBA .
However, the Certified EIR concluded that the nighttime construction activities would exceed the City of Los Angeles’ nighttime construction noise threshold of 5 dBA above ambient levels at two receptor group locations.
The Approved Project anticipated that nighttime construction would be limited to construction of the baseball stadium in PA 1 and the two parking structures in PA 5. Implementation of Mitigation Measure N -1, requiring a 1239
November 17, 2025 | Page 11
variety of noise reduction measures for nighttime construction activities, would reduce construction noise impacts to less than significant.
» Transportation Noise. The Certified EIR determined that the Approved Project would increase traffic-noise levels above the allowable increases in ambient noise levels for Receptor Groups 1 and 3. T he Certified EIR considered several mitigation measures to reduce noise levels associated with traffic increases from the ORSC, but no mitigation measures were considered feasible. The Approved Project was determined to have significant and unavoidable impacts with respect to transportation noise. » Stationary Source Noise. The Certified EIR included analyses of noise levels associated with several noise sources of the ORSC, including the baseball stadium, athletic fields, HVAC (heating ventilation, and air conditioning) equipment, loading docks, emergency generators, maintenance equipment , and the pickle ball restaurant . Both average and peak noise levels associated with baseball games and concerts at the stadium were determined to not exceed the maximum exterior noise standards in the Ontario Municipal Code at receptor group locations.
Similarly, noise levels associated with the athletic fields under weekday, weekend, and weekend with tournaments scenarios would not exceed the City’s exterior noise standards at receptor group locations. All other miscellaneous noise sources were determined to have less than significant impacts on noise -sensitive receptors; however, due to the distance of receptors to project buildings, HVAC equipment noise was determined to have a potentially significant impact. The Certified EIR incorporated Mitigation Measures N -2 and N-3, which require design and placement of HVAC equipment that ensures noise levels would not exceed the City’s maximum allowable exterior noise standards. These mitigation measures reduced HVAC noise impacts to less than significant.
» Vibration. The Certified EIR concluded that the highest level of vibration from construction equipment at the nearest off-site building would be limited to 0.1601 inches per second peak particle velocity (PPV) . Because this level is below the FTA damage impact criteria for vibration, vibration damage impacts were considered less than significant under the Approved Project. Additionally, due to the distance of receptors to project construction activities, vibration annoyance impacts were considered less than significant. » Airport Noise. The Certified EIR noted that while the ORSC is within the Influence Areas of the Ontario International Airport and the Chino Airport, the site is outside of the noise contours and safety zones of both airports. Impacts with respect to exposure to airport-related noise were considered less than significant.
IMPACTS ASSOCIATED WITH THE PROPOSED PROJECT
Would the project result in:
a) Generation of a substantial temporary or permanent increase in ambient noise levels in the vicinity of the project in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies?
The Certified EIR determined that noise associated with nighttime construction of the Approved Project would be less significant with incorporation of Mitigation Measure N-1. Additionally, while noise associated with HVAC equipment under the Approved Project was considered potentially significant, implementation of Mitigation Measures N-1 and N-2 would reduce impacts to less than significant.
CONSTRUCTION NOISE
The Proposed Project would redistribute the commercial/retail and hotel space within PAs 2 through 4 of the ORSC, resulting in an overall reduction in building square footage across these PAs of the ORSC. Due to the overall 1240
November 17, 2025 | Page 12
decrease in building space under the Proposed Project when compared to the Approved Project and corresponding decrease in construction activity, construction noise impacts are also anticipated to decrease under the Proposed Project.
The Certified EIR concluded that the maximum daytime construction noise levels at the nearest receptor group to PAs 2 through 4, Receptor Group 5 (residences east of the Cucamonga Creek Channel), would be 72 dBA, as shown in Table 5.13-14, Ontario Regional Sports Complex Daytime Cumulative Construction Noise , of the Certified EIR.
These maximum noise levels were anticipated to occur during Phase 1A of the ORSC, which included mass grading of the ORSC site. Construction of the retail and hospitality uses of PA 2 through 4 was anticipated in Phases 1B and 2 , when noise levels would reach a maximum of 68 dBA at Receptor Group 5. As shown in Table 5.13-10, Source Noise Levels for Construction Equipment, of the Certified EIR, the average Lmax of the loudest piece of equipment used for construction of the ORSC is 92 dBA at 50 feet. The nearest sensitive receptor to the Proposed Project in Receptor Group 5 is approximately 140 feet east of the boundary of PA 2. Noise levels from the loudest pieces of equipment would attenuate to 78 dBA at the outdoor activity areas of these residences, accounting for a 3 dBA reduction from the existing sound wall.
Therefore, conservatively assuming that the loudest pieces of equipment would be used at the boundary of the project site, the maximum noise level of this activity would not exceed the FTA threshold of 80 dBA Leq for residential areas. Daytime construction impacts under the Proposed Project would remain less than significant.
Though construction of the retail and hospitality uses in PAs 2 through 4 was not anticipated to occur at night , the provisions of Mitigation Measure N-1 would apply to all construction under the ORSC, including the portion under the Proposed Project. Compliance with this measure would result in a further reduction of construction noise.
Therefore, nighttime construction impacts would also be less than significant. The Proposed Project would not result in new or increase the severity of construction-related noise impacts compared to the Certified EIR.
OPERATIONAL NOISE
Traffic Noise
A project will normally have a significant effect on the environment related to traffic noise if it substantially increases the ambient noise levels for adjoining areas. Most people can detect changes in sound levels of approximately 3 dBA under normal, quiet conditions, and changes of 1 to 3 dBA under quiet, controlled conditions.
Changes of less than 1 dBA are usually indiscernible. A change of 5 dBA is readily discernible to most people in an outdoor environment. Based on this, a significant impact would occur if traffic noise increases by 3 dBA.
Table 5, Average Daily Trip Generation Comparison for the Approved Project and Proposed Project , shows that trips to the ORSC would decrease on the typical weekday with a stadium event scenario and would increase on Saturdays under both the “one tournament, no baseball stadium event” and “baseball stadium event with no tournament” scenarios. A doubling in daily traffic trips due to the Proposed Project would result in a 3 dBA increase. The increase of 114 trips on Saturdays under the Proposed Project represents a 1.4 percent increase in Saturday average daily traffic tips. This increase would result in a traffic noise level increase of less than 1 dBA due to the Proposed Project.
Therefore, traffic noise impacts under the Proposed Project are expected to remain similar to those under the Approved Project. Though impacts would continue to remain significant and unavoidable, the Proposed Project would not result in new or increase the severity of traffic-related noise impacts compared to the Certified EIR. 1241
November 17, 2025 | Page 13
Stationary Source Noise
The Proposed Project would result in a reduction of building square footage across PAs 3 and 4, which would also reduce the amount of noise-producing stationary sources in these PAs, including HVAC equipment, loading cocks, emergency generators, and maintenance equipment. The proposed Aloft & Residence Inn in PA 2 would result in an increase in hotel square footage in this PA when compared to the Approved Project. According to project site plans, the distance from the footprint of the hotel complex to the nearest sensitive receptor (residences east of the ORSC in Receptor Group 5) is approximately 370 feet.
To ensure that noise levels associated with the proposed Aloft & Residence Inn meet the City’s municipal code standards for noise from HVAC equipment at sensitive receptor locations, in addition to other development within PAs 2 through 4, the Proposed Project would be required to implement Mitigation Measure N- 3. As noted in the Certified EIR, noise associated with loading docks at hotel uses in PAs 2 through 4 would not result in noise levels that exceed the City’s noise standards at sensitive receptor locations. The loudest potential noise source from loading dock activities would be movement alarms on trucks that result in noise levels of 74 dBA at 50 feet.
However, this activity would only occur in the daytime hours, and noise levels would attenuate to 59 dBA at the nearest sensitive receptors. At 370 feet, the distance of the proposed Aloft & Residence Inn building to the nearest sensitive receptor, noise levels associated with loading dock activities would attenuate to 57 dBA. Similar to the Approved Project, potential stationary noise under the Proposed Project would not exceed the maximum allowable noise standards from Section 5-29.04 of the City’s Municipal Code, shown in Table 3.
With implementation of Mitigation Measure N-3, impacts would continue to remain less than significant, and the Proposed Project would not result in new or increase the severity of stationary source- related noise impacts compared to the Certified EIR.
b) Generation of excessive groundborne vibration or groundborne noise levels? The Certified EIR determined that vibration impacts associated with construction and operation of the Approved Project would be less than significant due to the distance of off-site buildings and receptors to vibration-producing activities. The closest off-site building to the ORSC noted in the Certified EIR is 32 feet north of the ORSC site. The closest buildings to PAs 2 through 4 are the residences east of the ORSC site along Plymouth Avenue, approximately 140 feet away. Since the Proposed Project’s use of construction equipment would remain largely the same as that under the Approved Project, vibration impacts under the Proposed Project would remain the same as under the Approved Project. Therefore, the Proposed Project would not result in any new or more severe impacts related to vibration impacts when compared to those analyzed in the Certified EIR.
Table 5 Average Daily Trip Generation Comparison for the Approved Project and Proposed Project
Weekday with
Stadium Event
Saturday with Tournament
(No Baseball Stadium
Event)
Saturday with Baseball
Stadium Event (No
Tournaments)
Approved Project 8,060 8,035 8,035
Proposed Project 7,638 8,149 8,149
Difference -422 114 114
Source: City of Ontario 2025 (see Attachment A).
1242
November 17, 2025 | Page 14
c) For a project located within the vicinity of a private airstrip or an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? The Certified EIR determined that impacts with respect to airport noise under the A pproved Project would be less than significant since the ORSC site is not within the noise contours or safety zones of Ontario International Airport or Chino Airport. As part of the ORSC within the ORSC site, the Proposed Project would have the same impacts with respect to airport-related noise as the Approved Project. Impacts would continue to be less than significant, and the Proposed Project would also not result in any new or more severe impacts when compared to those analyzed in the Certified EIR.
Adopted Mitigation Measures Applicable to the Proposed Project The following applicable mitigation measures were taken directly from the Certified EIR and would be incorporated as part of the Proposed Project. Any modifications to these mitigation measures are shown in strikethrough for deleted text and underline for new, inserted text.
Mitigation Measure N-2 references impacts related to the indoor athletic facility building in PA 6 and would therefore not apply to the Proposed Project.
N-1 The construction contractor shall implement the following measures during construction activities on the ORSC site and Offsite Improvement Area. These measures shall be identified on demolition, grading, and/or building permits.
Prior to construction activities that warrant nighttime construction (e.g., infrastructure work, concrete pours, etc.), the construction contractor shall install noise pathway controls, including noise barriers and enclosures free from gaps and holes, which shall be placed as close as possible to construction areas. The temporary noise barrier shall be a sufficient height to block the direct line-of-sight between the on-site construction areas and off-site noise sensitive receptors and shall be a minimum of 6 feet tall and shall be constructed out of wood or other materials with a minimum surface weight of approximately 2.5 pounds per square foot. Construction equipment operating on a site shall be equipped with the appropriate manufacturer’s noise reduction devices, including but not limited to a manufacturer’s muffler (or equivalently rated material) that is free of rust, holes, and exhaust leaks. Noise from construction devices with internal combustion engines shall be mitigated by ensuring that the engine's housing doors are kept closed, and by using noise-insulating material mounted on the engine housing that does not interfere with the manufacturer's guidelines for engine operation or exhaust.
Portable compressors, generators, pumps, and other such devices shall be covered with noise- insulating fabric to the maximum extent possible that does not interfere with the manufacturer's guidelines for engine operation or exhaust, and shall further reduce noise by operating the device at lower engine speeds during the work to the maximum extent possible. Idling on-site of heavy-duty diesel vehicles with Gross Vehicle Weight Rating of 10,000 pounds shall be limited to no longer than five minutes while parking, standing, or stopping, as per 13 California Code of Regulations Section 2485, Airborne Toxic Control Measure to Limit Diesel-Fueled Commercial Motor Vehicle Idling.
Quieter back-up alarms on construction equipment shall be used whenever feasible. 1243
November 17, 2025 | Page 15
Construction vehicles shall be strategically positioned to minimize operation near receptors and avoiding tailgate slamming to the extent possible.
N-2 HVAC Equipment, Planning Area 6 Indoor Athletic Facility Building. An acoustics study shall be provided to the City of Ontario prior to building permit issuance for the indoor athletic facility in Planning Area 6 that documents compliance with the overnight noise levels in the City’s municipal code (45 dBA at single-family residences from 10:00 pm to 7:00 am). HVAC equipment for the indoor athletic facility shall be designed and/or placed to yield a sound level less than 58 dBA at 50 feet. Noise associated with operation of heating and cooling equipment shall be minimized by the design and strategic placement of equipment.
N-3 HVAC Equipment, Planning Areas 2, 3, 4, and 7 Buildings. An acoustics study shall be provided to the City of Ontario prior to building permit issuance for new structures with HVAC systems in Planning Areas 2, 3, 4, and 7 that documents compliance with the overnight noise levels in the City’s municipal code (45 dBA at single-family residences from 10:00 pm to 7:00 am). HVAC equipment for the indoor athletic facility shall be designed and/or placed to yield a sound level less than 65 dBA at 50 feet to ensure compliance would result in a noise level of approximately 44 dBA at residential land uses to the east along Plymouth Avenue. Noise associated with operation of heating and cooling equipment shall be minimized by the design and strategic placement of equipment.
Bibliography
Federal Transit Administration (FTA). 2018, September. Transit Noise and Vibration Impact Assessment Manual. https://www.transit.dot.gov/sites/fta.dot.gov/files/docs/research-innovation/118131/ transit-noise-and-vibration-impact-assessment-manual-fta-report-no-0123_0.pdf.
Ontario, City of. 2022a. The Ontario Plan: Policy Plan, Safety. https://www.ontarioca.gov/government/ community-development/planning/ontario-plan/ontario-plan-policy-plan/safety. ––––––. 2022a, August. The Ontario Plan 2050 Final Supplemental Environmental Impact Report (SCH No. 2021070364).
https://content.ontarioca.gov/sites/default/files/2024-12/Final_DraftSEIR_TOP2050.pdf. ––––––. 2025, September. Approved Project and Proposed Project Trip Generation . (Attachment A).
1244
November 17, 2025 | Page 16
Attachment A: Approved Project and Proposed Project Trip Generation
1245
ORSC EIR Data Source Quantity Unit Rate %In %Out Rate %In %Out In Out Total In Out Total PA 2
ITE Code 821-Shopping Plaza 22.5 KSF 67.52 1.73 62% 38% 5.19 49% 51% 1519 24 15 39 58 59 117 ITE Code 930-Fast Casual Restaurant 22.5 KSF 97.14 1.43 50% 50% 12.55 55% 45% 2186 16 17 33 155 127 282 Hotel 0
PA 3
ITE Code 821-Shopping Plaza 10.5 KSF 67.52 1.73 62% 38% 5.19 49% 51% 709 11 7 18 27 28 55 ITE Code 930-Fast Casual Restaurant 10.5 KSF 97.14 1.43 50% 50% 12.55 55% 45% 1020 8 8 16 72 59 131 Hotel 70,000 sq ft/100 rooms ITE Code 310-Hotel 100 Keys 7.99 0.46 56% 44% 0.59 51% 49% 799 26 20 46 30 29 59 PA 4
ITE Code 821-Shopping Plaza 7 KSF 67.52 1.73 62% 38% 5.19 49% 51% 473 8 5 13 18 19 37 ITE Code 930-Fast Casual Restaurant 7 KSF 97.14 1.43 50% 50% 12.55 55% 45% 680 5 5 10 48 40 88 Chicken 'n Pickle San Antonio Data 12 Courts 124.4 4.6 93% 7% 11.7 68% 32% 1493 51 4 55 95 45 140 Lodging and Retail Total 8879 149 81 230 503 406 909
Hotel Internalization Reduction (20% of Hotel Trips) -160 -5 -4 -9 -6 -6 -12 Retail Internalization Reduction (10% of Retail Trips) -659 -7 -6 -13 -38 -33 -71 Lodging and Retail Total Subtotal 8060 137 71 208 459 367 826 Revised Data Source Quantity Unit Rate %In %Out Rate %In %Out In Out Total In Out Total PA 2
ITE Code 821-Shopping Plaza 17.53 KSF 67.52 1.73 62% 38% 5.19 49% 51% 1184 19 12 31 45 46 91 ITE Code 930-Fast Casual Restaurant 17.53 KSF 97.14 1.43 50% 50% 12.55 55% 45% 1703 13 13 26 121 99 220 Hotel 249 Rooms ITE Code 310-Hotel 249 Keys 7.99 0.46 56% 44% 0.59 51% 49% 1990 64 50 114 75 72 147 PA 3
ITE Code 821-Shopping Plaza 5 KSF 67.52 1.73 62% 38% 5.19 49% 51% 338 5 4 9 13 13 26 ITE Code 930-Fast Casual Restaurant 5 KSF 97.14 1.43 50% 50% 12.55 55% 45% 486 4 4 8 35 28 63 Hotel 0
PA 4
ITE Code 821-Shopping Plaza 18.26 KSF 67.52 1.73 62% 38% 5.19 49% 51% 1233 20 13 33 46 48 94 ITE Code 930-Fast Casual Restaurant 18.26 KSF 97.14 1.43 50% 50% 12.55 55% 45% 1774 13 14 27 126 103 229 Lodging and Retail Total 8708 138 110 248 461 409 870
Hotel Internalization Reduction (20% of Hotel Trips) -398 -13 -10 -23 -15 -14 -29 Retail Internalization Reduction (10% of Retail Trips) -672 -7 -6 -13 -39 -34 -72 Lodging and Retail Total Subtotal 7638 118 94 212 407 361 769 PROPOSED - APPROVED (TYPICAL WEEKDAY WITH STADIUM EVENT) -422 -19 23 4 -52 -6 -57 AM Peak PM Peak
Trip Generation Rates (11th Edition) Estimated Trip Generation (11th Edition) AM Peak PM PeakDaily TripsDaily Rate
Trip Generation Rates (11th Edition) Estimated Trip Generation (11th Edition) Daily Trips AM Peak PM Peak Daily Trips AM Peak PM Peak Retail 21,000 sq ft
Retail 45,000 sq ft
Retail 114,000 sq ft
Retail 35,055.44 sq ft
Retail 10,000 sq ft
Retail 36,512.54 sq ft
1246
ORSC EIR Data Source Quantity Unit Rate %In %Out In Out Total PA 2
ITE Code 821-Shopping Plaza 22.5 KSF 81.07 6.22 52% 48% 1824 73 67 140 ITE Code 930-Fast Casual Restaurant 22.5 KSF 97.14 32.64 55% 45% 2186 404 330 734 Hotel 0
PA 3
ITE Code 821-Shopping Plaza 10.5 KSF 81.07 6.22 52% 48% 851 34 31 65 ITE Code 930-Fast Casual Restaurant 10.5 KSF 97.14 32.64 55% 45% 1020 188 154 342 Hotel 70,000 sq ft/100 rooms ITE Code 310-Hotel 100 Keys 8.07 0.72 56% 44% 807 40 32 72 PA 4
ITE Code 821-Shopping Plaza 7 KSF 81.07 6.22 52% 48% 567 23 21 44 ITE Code 930-Fast Casual Restaurant 7 KSF 97.14 32.64 55% 45% 680 126 103 229 Chicken 'n Pickle San Antonio Data 12 Courts 238 11.2 59% 41% 2856 79 55 134 Lodging and Retail Total 10791 967 793 1760
Hotel Internalization Reduction (50% of Hotel Trips) -404 -20 -16 -36 Retail Internalization Reduction (33% of Retail Trips) -2352 -280 -233 -513 Lodging and Retail Total Subtotal 8035 667 544 1211
Revised Data Source Quantity Unit Rate %In %Out In Out Total PA 2
ITE Code 821-Shopping Plaza 17.53 KSF 81.07 6.22 52% 48% 1421 57 52 109 ITE Code 930-Fast Casual Restaurant 17.53 KSF 97.14 32.64 55% 45% 1703 315 257 572 Hotel 249 Rooms ITE Code 310-Hotel 249 Keys 8.07 0.72 56% 44% 2009 100 79 179 PA 3
ITE Code 821-Shopping Plaza 5 KSF 81.07 6.22 52% 48% 405 16 15 31 ITE Code 930-Fast Casual Restaurant 5 KSF 97.14 32.64 55% 45% 486 90 73 163 Hotel 0
PA 4
ITE Code 821-Shopping Plaza 18.26 KSF 81.07 6.22 52% 48% 1480 59 55 114 ITE Code 930-Fast Casual Restaurant 18.26 KSF 97.14 32.64 55% 45% 1774 328 268 596 Lodging and Retail Total 9278 965 799 1764
Hotel Internalization Reduction (50% of Hotel Trips) -402 -20 -16 -36 Retail Internalization Reduction (33% of Retail Trips) -727 -87 -72 -159 Lodging and Retail Total Subtotal 8149 858 711 1569
PROPOSED - APPROVED (SATURDAY WITH ONE TOURNAMENT - NO BASEBALL STADIUM USE) 114 191 167 358 Trip Generation Rates (11th Edition) Estimated Trip Generation (11th Edition) Daily Rate Midday Peak Hour Daily
Trips
Midday Peak Hour
Retail 45,000 sq ft
Retail 21,000 sq ft
Retail 114,000 sq ft
Trip Generation Rates (11th Edition) Estimated Trip Generation (11th Edition) Daily Trips Midday Peak Hour Daily
Trips
Midday Peak Hour
Retail 35,055.44 sq ft
Retail 10,000 sq ft
Retail 36,512.54 sq ft
1247
ORSC EIR Data Source Quantity Unit Rate %In %Out In Out Total PA 2
ITE Code 821-Shopping Plaza 22.5 KSF 81.07 6.22 52% 48% 1824 73 67 140 ITE Code 930-Fast Casual Restaurant 22.5 KSF 97.14 32.64 55% 45% 2186 404 330 734 Hotel 0
PA 3
ITE Code 821-Shopping Plaza 10.5 KSF 81.07 6.22 52% 48% 851 34 31 65 ITE Code 930-Fast Casual Restaurant 10.5 KSF 97.14 32.64 55% 45% 1020 188 154 342 Hotel 70,000 sq ft/100 rooms ITE Code 310-Hotel 100 Keys 8.07 0.72 56% 44% 807 40 32 72 PA 4
ITE Code 821-Shopping Plaza 7 KSF 81.07 6.22 52% 48% 567 23 21 44 ITE Code 930-Fast Casual Restaurant 7 KSF 97.14 32.64 55% 45% 680 126 103 229 Chicken 'n Pickle San Antonio Data 12 Courts 238 17.8 58% 42% 2856 124 90 214 Lodging and Retail Total 10791 1012 828 1840
Hotel Internalization Reduction (50% of Hotel Trips) -404 -20 -16 -36 Retail Internalization Reduction (33% of Retail Trips) -2352 -280 -233 -513 Lodging and Retail Total Subtotal 8035 712 579 1291
Revised Data Source Quantity Unit Rate %In %Out In Out Total PA 2
ITE Code 821-Shopping Plaza 17.53 KSF 81.07 6.22 52% 48% 1421 57 52 109 ITE Code 930-Fast Casual Restaurant 17.53 KSF 97.14 32.64 55% 45% 1703 315 257 572 Hotel 249 Rooms ITE Code 310-Hotel 249 Keys 8.07 0.72 56% 44% 2009 100 79 179 PA 3
ITE Code 821-Shopping Plaza 5 KSF 81.07 6.22 52% 48% 405 16 15 31 ITE Code 930-Fast Casual Restaurant 5 KSF 97.14 32.64 55% 45% 486 90 73 163 Hotel 0
PA 4
ITE Code 821-Shopping Plaza 18.26 KSF 81.07 6.22 52% 48% 1480 59 55 114 ITE Code 930-Fast Casual Restaurant 18.26 KSF 97.14 32.64 55% 45% 1774 328 268 596 Lodging and Retail Total 9278 965 799 1764
Hotel Internalization Reduction (50% of Hotel Trips) -402 -20 -16 -36 Retail Internalization Reduction (33% of Retail Trips) -727 -87 -72 -159 Lodging and Retail Total Subtotal 8149 858 711 1569
PROPOSED - APPROVED (SATURDAY WITH STADIUM EVENT - NO FIELD TOURNAMENTS) 114 146 132 278 Trip Generation Rates (11th Edition) Estimated Trip Generation (11th Edition) Daily Rate Peak Hour of Arrival (5-6PM) Daily
Trips
Peak Hour of Arrival (5-6PM)
Retail 45,000 sq ft
Retail 21,000 sq ft
Retail 114,000 sq ft
Trip Generation Rates (11th Edition) Estimated Trip Generation (11th Edition) Daily Trips Peak Hour of Arrival (5-6PM) Daily
Trips
Peak Hour of Arrival (5-6PM)
Retail 35,055.44 sq ft
Retail 10,000 sq ft
Retail 36,512.54 sq ft
1248
November 17, 2025 | Page 17
Attachment B: Certified EIR Noise-Sensitive Receptors Figure
1249
!!(
!!( !!( !!(!!( !!(!!( !!( !!( !!( !!( !!(!!(
!!(
!!( !!( !!(!!( !!( !!(!!( !!( !!( !!( !!( !!(!!(
!!(!!(
!!(
!!(
!!(
!!(
!!( !!( !!( !!( !!( !!( !!( !!( !!( !!(
!!( !!( !!( !!( !!(!!( !!( !!( !!(!!(!!( !!( !!( !!( !!( !!( !!( !!(!!( !!( !!(
!!(
!!(
!!(
!!(!!(!!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!( !!( !!( !!( !!( !!( !!( !!( !!( !!( !!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!( !!( !!( !!( !!( !!( !!( !!( !!(!!(
!!(
!!(!!(!!(!!(!!(!!(!!(!!(!!( !!( !!( !!( !!( !!( !!( !!(!!(!!( !!(
!!(!!(!!(!!(
!!(!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(!!(
!!(
!!(
!!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!( !!( !!( !!( !!( !!( !!( !!( !!( !!( !!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!( !!( !!( !!( !!( !!( !!(
!!(
!!(
!!(
!!(
!!(!!(!!(!!(!!(!!( !!(
!!(
!!(
!!(
!!(
!!(!!(!!(!!(!!(!!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(
!!(
!!(!!(!!(
!!(
!!( !!(!!(!!(
!!( !!(
!!( !!( !!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(
!!(!!(!!(
!!(!!(!!(
!!(!!(!!(!!(!!(!!(!!(!!( !!(!!(!!(!!( !!(!!(!!(
!!(
!!(!!( !!(!!(
!!(!!(!!(
!!(!!(!!(!!(!!(!!(
!!(!!(
!!(
!!(!!(!!(
!!(!!(!!(!!(!!( !!(
!!(
!!(
!!(!!( !!( !!( !!(!!(
!!(!!(!!(!!(!!(!!(
!!(!!(!!(
!!(
!!(
!!( !!(!!( !!(!!(!!(
!!(
!!(!!( !!(
!!( !!(!!(!!(!!( !!(!!(!!(!!(!!(
!!(!!(
!!(!!(!!(!!(!!(
!!(
!!(!!(!!(!!(
!!(
!!(
!!( !!( !!( !!( !!( !!( !!( !!( !!( !!( !!( !!(
!!(
!!(
!!(
!!( !!(
!!(
!!(!!(!!(
!!(!!(!!(
!!(!!(
!!(
!!(!!(
!!(
!!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!( !!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(!!(!!(!!(!!(!!(
!!( !!(
!!(
!!(!!(
!!( !!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!( !!(!!(!!(!!(
!!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(!!( !!(
!!(
!!( !!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
O
N
M
L
S
R
Q
P
R187
R186
R185
R184
R179
R178
R180
R181
R182 R183
R32
R30
R28
R26
R13
R208
R206
R204
R202
R224
R222
R219
R217
R215
R213
R212
R210
R31
R29
R27
R14
R209
R207
R205
R203
R225
R223
R221
R220
R218
R216
R214
R211
R9R7R5R4R2R1 R11
R8R6R3
R12
R10
R455
R454
R453
R451
R450
R449
R413
R412
R410
R408
R406
R405
R403
R402
R404
R407
R409
R411R452
R422
R421
R420
R270
R269
R247
R244
R242
R241
R240
R419R418
R416 R415 R414
R425 R423R424
R239
R243
R245
R246
R268
R303
R300
R297
R294 R291R289
R290R292R293R295
R296R298
R299R301
R302
R388
R386
R383
R381
R357
R331
R329
R328
R330
R332
R358
R382
R385
R387
R277
R276
R274
R271
R250
R248
R380
R249
R272
R273
R275
K
F G
J
D
E
C
B
I
A
H
R317, R316, R315, R319, R314,
R313, R318, R320, R321
R349, R348, R347, R346, R345,
R324, R323, R344, R322, R312,
R325, R311
R368, R369, R350, R352, R351,
R367, R341, R342, R343, R326,
R327, R340, R307, R308, R305,
R304, R306, R310, R309
R401, R397, R400, R399, R372,
R371, R375, R370, R376, R374,
R373, R377, R378, R398
R396, R395, R394, R393, R379,
R384, R392, R391, R390, R389
R278, R279, R287, R288, R286,
R285, R284, R283, R282, R281,
R280
R267, R265, R266, R262, R257,
R256, R255, R254, R253, R251,
R252, R258, R259, R260, R261,
R263, R264
R353, R355, R356, R360, R361,
R362, R363, R364, R365, R366,
R354
R333, R334, R335, R336, R339,
R337, R338, R359
R227, R228, R229, R230, R231,
R232, R233, R234, R235, R236,
R237, R238
R428, R429; R430, R431; R432,
R433; R434, R435; R427; R448;
R447; R446; R445; R436, R437;
R438, R439; R440; R441, R442;
R443; R444
R25, R24, R23, R22, R21, R20,
R19, R18, R17, R16, R15, R33,
R34, R35, R36, R37, R38, R39,
R40, R41, R42, R63
R64, R65, R52, R51, R50, R49,
R48, R47, R46, R45, R44, R43,
R53, R54, R55, R56, R57, R58,
R59, R60, R61, R62, R66
R69, R68, R70, R71, R72, R73,
R74, R75, R76, R77, R78, R79,
R80, R81, R82, R83, R84, R85,
R86, R87, R88, R89, R67
R90, R91, R92, R93, R94, R95,
R96, R97, R98, R99, R100, R101,
R102, R103, R104, R105, R106,
R107, R109, R108
R110, R127, R111, R112, R113, R114,
R115, R116, R117, R118, R119, R120,
R121, R122, R123, R124, R125, R126,
R127, R128, R129
R130, R131, R153, R152, R151, R150,
R149, R148, R147, R146, R145, R144,
R143, R142, R141, R140, R139, R138,
R137, R136, R135, R134, R132, R133
R154, R155, R156, R157, R158, R159,
R160, R161, R162, R163, R164, R165,
R166, R167, R168, R169, R170, R171
R172, R173, R174, R175, R176, R177,
R226, R188, R189, R190, R191, R192,
R193, R194, R195, R196, R197, R198,
R199, R200, R201
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
R475
R474
R473
R472
R471
R470
R469
R468
R467
R466
R465
R464
R463
R462
R461
R460R459
R458
R457R456R426a
R426b
R417a
R417b
ReceptorReceptor
Group 5Group 5
ReceptorReceptor
Group 3Group 3
ReceptorReceptor
Group 2Group 2
ReceptorReceptor
Group 1Group 1
ReceptorReceptor
Group 4Group 4
ReceptorReceptor
Group 6Group 6
Ontario Ave
Vineyard Ave
Dunes St
E Riverside Dr
Whispering Lakes Ln
Street A
Street B
Cucamonga Creek Flood Control Channel
Chino Ave
Multipurpose
Fields
Proforma
Fields
Soccer
Fields
Little
League
Skate
Park
Pools
Tot Lot
Tennis/Pickleball
Pool
Parking
Structure A
Parking
Structure B
Indoor
Athletic
Facility
Community
Center
Hotel
Maintenance
BuildingBatting
Cages
Retail
Retail
Retail
Retail
Retail
Retail
RetailRetail
RetailRetail
Retail
Parking
Lot
Parking
Lot
Parking
Lot
Parking
Lot
Stadium
Soccer
Field
Ontario, California
° 0 500 1,000 Feet
Ontario Regional Sports Complex
EIR
Receptor Locations and
Receptor Groups
Receptor Group
Study Area
Sports Complex Feature
Sports Complex Building
Receptor Location!!(
Source: HMMH 2023.
PlaceWorks
0 Scale (Feet)
500
ONTARIO REGIONAL SPORTS COMPLEX DRAFT EIR
CITY OF ONTARIO
Figure 5.13-2 - Noise-Sensitive Receptor Groups
5. Environmental Analysis
!!(
!!( !!( !!(!!( !!(!!( !!( !!( !!( !!( !!(!!(
!!(
!!( !!( !!(!!( !!( !!(!!( !!( !!( !!( !!( !!(!!(
!!(!!(
!!(
!!(
!!(
!!(
!!( !!( !!( !!( !!( !!( !!( !!( !!( !!(
!!( !!( !!( !!( !!(!!( !!( !!( !!(!!(!!( !!( !!( !!( !!( !!( !!( !!(!!( !!( !!(
!!(
!!(
!!(
!!(!!(!!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!( !!( !!( !!( !!( !!( !!( !!( !!( !!( !!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!( !!( !!( !!( !!( !!( !!( !!( !!(!!(
!!(
!!(!!(!!(!!(!!(!!(!!(!!(!!( !!( !!( !!( !!( !!( !!( !!(!!(!!( !!(
!!(!!(!!(!!(
!!(!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(!!(
!!(
!!(
!!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!( !!( !!( !!( !!( !!( !!( !!( !!( !!( !!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!( !!( !!( !!( !!( !!( !!(
!!(
!!(
!!(
!!(
!!(!!(!!(!!(!!(!!( !!(
!!(
!!(
!!(
!!(
!!(!!(!!(!!(!!(!!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(
!!(
!!(!!(!!(
!!(
!!( !!(!!(!!(
!!( !!(
!!( !!( !!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(
!!(!!(!!(
!!(!!(!!(
!!(!!(!!(!!(!!(!!(!!(!!( !!(!!(!!(!!( !!(!!(!!(
!!(
!!(!!( !!(!!(
!!(!!(!!(
!!(!!(!!(!!(!!(!!(
!!(!!(
!!(
!!(!!(!!(
!!(!!(!!(!!(!!( !!(
!!(
!!(
!!(!!( !!( !!( !!(!!(
!!(!!(!!(!!(!!(!!(
!!(!!(!!(
!!(
!!(
!!( !!(!!( !!(!!(!!(
!!(
!!(!!( !!(
!!( !!(!!(!!(!!( !!(!!(!!(!!(!!(
!!(!!(
!!(!!(!!(!!(!!(
!!(
!!(!!(!!(!!(
!!(
!!(
!!( !!( !!( !!( !!( !!( !!( !!( !!( !!( !!( !!(
!!(
!!(
!!(
!!( !!(
!!(
!!(!!(!!(
!!(!!(!!(
!!(!!(
!!(
!!(!!(
!!(
!!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!( !!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(!!(!!(!!(!!(!!(
!!( !!(
!!(
!!(!!(
!!( !!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(!!( !!(!!(!!(!!(
!!(
!!(!!(!!(!!(!!(!!(!!(!!(!!(!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(!!( !!(
!!(
!!( !!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
!!(
O
N
M
L
S
R
Q
P
R187
R186
R185
R184
R179
R178
R180
R181
R182 R183
R32
R30
R28
R26
R13
R208
R206
R204
R202
R224
R222
R219
R217
R215
R213
R212
R210
R31
R29
R27
R14
R209
R207
R205
R203
R225
R223
R221
R220
R218
R216
R214
R211
R9R7R5R4R2R1 R11
R8R6R3
R12
R10
R455
R454
R453
R451
R450
R449
R413
R412
R410
R408
R406
R405
R403
R402
R404
R407
R409
R411R452
R422
R421
R420
R270
R269
R247
R244
R242
R241
R240
R419R418
R416 R415 R414
R425 R423R424
R239
R243
R245
R246
R268
R303
R300
R297
R294 R291R289
R290R292R293R295
R296R298
R299R301
R302
R388
R386
R383
R381
R357
R331
R329
R328
R330
R332
R358
R382
R385
R387
R277
R276
R274
R271
R250
R248
R380
R249
R272
R273
R275
K
F G
J
D
E
C
B
I
A
H
R317, R316, R315, R319, R314,
R313, R318, R320, R321
R349, R348, R347, R346, R345,
R324, R323, R344, R322, R312,
R325, R311
R368, R369, R350, R352, R351,
R367, R341, R342, R343, R326,
R327, R340, R307, R308, R305,
R304, R306, R310, R309
R401, R397, R400, R399, R372,
R371, R375, R370, R376, R374,
R373, R377, R378, R398
R396, R395, R394, R393, R379,
R384, R392, R391, R390, R389
R278, R279, R287, R288, R286,
R285, R284, R283, R282, R281,
R280
R267, R265, R266, R262, R257,
R256, R255, R254, R253, R251,
R252, R258, R259, R260, R261,
R263, R264
R353, R355, R356, R360, R361,
R362, R363, R364, R365, R366,
R354
R333, R334, R335, R336, R339,
R337, R338, R359
R227, R228, R229, R230, R231,
R232, R233, R234, R235, R236,
R237, R238
R428, R429; R430, R431; R432,
R433; R434, R435; R427; R448;
R447; R446; R445; R436, R437;
R438, R439; R440; R441, R442;
R443; R444
R25, R24, R23, R22, R21, R20,
R19, R18, R17, R16, R15, R33,
R34, R35, R36, R37, R38, R39,
R40, R41, R42, R63
R64, R65, R52, R51, R50, R49,
R48, R47, R46, R45, R44, R43,
R53, R54, R55, R56, R57, R58,
R59, R60, R61, R62, R66
R69, R68, R70, R71, R72, R73,
R74, R75, R76, R77, R78, R79,
R80, R81, R82, R83, R84, R85,
R86, R87, R88, R89, R67
R90, R91, R92, R93, R94, R95,
R96, R97, R98, R99, R100, R101,
R102, R103, R104, R105, R106,
R107, R109, R108
R110, R127, R111, R112, R113, R114,
R115, R116, R117, R118, R119, R120,
R121, R122, R123, R124, R125, R126,
R127, R128, R129
R130, R131, R153, R152, R151, R150,
R149, R148, R147, R146, R145, R144,
R143, R142, R141, R140, R139, R138,
R137, R136, R135, R134, R132, R133
R154, R155, R156, R157, R158, R159,
R160, R161, R162, R163, R164, R165,
R166, R167, R168, R169, R170, R171
R172, R173, R174, R175, R176, R177,
R226, R188, R189, R190, R191, R192,
R193, R194, R195, R196, R197, R198,
R199, R200, R201
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
R475
R474
R473
R472
R471
R470
R469
R468
R467
R466
R465
R464
R463
R462
R461
R460R459
R458
R457R456R426a
R426b
R417a
R417b
ReceptorReceptor
Group 5Group 5
ReceptorReceptor
Group 3Group 3
ReceptorReceptor
Group 2Group 2
ReceptorReceptor
Group 1Group 1
ReceptorReceptor
Group 4Group 4
ReceptorReceptor
Group 6Group 6
Ontario Ave
Vineyard Ave
Dunes St
E Riverside Dr
Whispering Lakes Ln
Street A
Street B
Cucamonga Creek Flood Control Channel
Chino Ave
Multipurpose
Fields
Proforma
Fields
Soccer
Fields
Little
League
Skate
Park
Pools
Tot Lot
Tennis/Pickleball
Pool
Parking
Structure A
Parking
Structure B
Indoor
Athletic
Facility
Community
Center
Hotel
Maintenance
BuildingBatting
Cages
Retail
Retail
Retail
Retail
Retail
Retail
RetailRetail
RetailRetail
Retail
Parking
Lot
Parking
Lot
Parking
Lot
Parking
Lot
Stadium
Soccer
Field
Ontario, California
° 0 500 1,000 Feet
Ontario Regional Sports Complex
EIR
Receptor Locations and
Receptor Groups
Receptor Group
Study Area
Sports Complex Feature
Sports Complex Building
Receptor Location!!(
ORSC Site
Receptor Location
Sports Complex Feature
Sports Complex Building
Receptor Group
Study Area
1250
1 Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 Mitigation Monitoring and Reporting Program
SCH: 2023110328
1251
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 2 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
Air Quality
AQ-1 The City of Ontario shall require the construction contractor to incorporate the following to reduce air pollutant
emissions during construction activities:
• Use construction equipment rated by the United States Environmental Protection Agency as having Tier 4 (model year 2015 or newer) Final or stricter emission limits for all off-
road construction equipment. If Tier 4 Final
equipment is not commercially available for a specific
piece of equipment, the applicant shall provide
documentation (e.g., rental inventory requests), to the City’s satisfaction, or otherwise demonstrate its
unavailability to the City of Ontario prior to the issuance of any construction permits and replacement equipment
used by the contractor shall achieve emissions reductions that are no less than what could be achieved by a Level 3 diesel emissions control strategy for a similarly sized engine as defined by the California Air Resources Bo ard regulations.
• If Tier 4 Final equipment is not available, the
construction contractor(s) and subcontractor(s)
affected shall use Tier 4 Interim equipment.
• If Tier 4 Interim equipment is not available, the
construction contractor(s) and subcontractor(s)
affected shall use then Tier 3 equipment outfitted
with a level 3 diesel particulate filter.
• For purposes of this mitigation measure,
“commercially available” shall mean the availability of Tier 4 engines similar to the availability for other
large-scale construction projects in the City occurring at the same time and taking into consideration factors
City of Ontario
Planning
Department and
Construction
Contractor
Prior to the start
of construction
and during
construction
City of Ontario
Planning/Building
Department
1252
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 3 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
such as (i) potential significant delays to critical -path timing of construction and (ii) geographic proximity to the project site of Tier 4 equipment.
• During construction, the construction contractor shall maintain a list of all operating equipment in use on the construction site for verification by the City of Ontario.
The construction equipment list shall state the makes,
models, Equipment Identificati
on Numbers, Engine
Family Numbers, and number of construction equipment
onsite.
• Use paints with a VOC content that meets the South
Coast Air Quality Management District Super Compliant
architectural coatings standard of 10 grams per liter (g/L) or less (i.e.,) for coating architectural surfaces.
• Comply with South Coast Air Quality Management
District Rule 403, including the following measures:
• Provide National Institute for Occupational Safety and Health (NIOSH)-approved respirators for workers with
a prior history of Valley Fever.
• Half-face respirators equipped with a minimum N -95
protection factor for use during worker collocation
with surface disturbance activities. Half- face
respirators equipped with N -100 or P- 100 filters
should be used during digging activities. Employees
should wear respirators when working near earth -
moving machinery.
• Post warnings onsite and consider limiting access to
visitors, especially those without adequate training
and respiratory protection.
1253
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 4 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
These identified measures shall be incorporated into all appropriate construction documents (e.g., construction
management plans) submitted to and verified by the City.
AQ-2 All landscaping equipment (e.g., leaf blower) used for property management shall be electric powered only. The property manager/facility owner shall provide
documentation (e.g., purchase, rental, and/or services
agreement) to the City of Ontario Planning Department to verify to the City’s satisfaction that all landscaping
equipment utilized will be electric powered.
City of Ontario
Planning and
Property
Manager/Facility
Owner
During project
operation
City of Ontario
Planning/Building
Department
See Mitigation Measures GHG-1, GHG-2, TRAF-1a, below.
Biological Resources
BIO-1 Worker Environmental Awareness Program and Biological Monitor: Prior to the start of construction of the ORSC site or sewer line within the Offsite Improvement Area, a
Worker Environmental Awareness Program (WEAP) shall
be developed by the City or the City’s consultant. A
qualified biologist with experience with the s ensitive biological resources in the region shall present the WEAP to all personnel working in the ORSC site and Offsite
Improvement Area (either temporarily or permanently)
prior to the start of project activities. The WEAP may be videotaped and used to train newly hired workers or those not present for the initial WEAP. The WEAP could include but shall not be limited to discussions of the sensitive biological resources associated with the ORSC, project - specific measures to avoid or eliminate impacts to th ese resources, consequences for not complying with project
permits and agreements, and contact information for the lead biologist. Logs of personnel who have taken the
training shall be kept on the site at the construction or project office.
In addition to a WEAP, a qualified biologist (biological monitor) with experience monitoring for and identifying City of Ontario and
Qualified Biologist
Prior to the start
of construction at
the ORSC site or
Offsite
Improvement
Area
City of Ontario
Planning
Department
1254
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 5 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
sensitive biological resources known to occur in the area shall be present during initial ground- disturbing activities related to the ORSC and Offsite Improvement Area
(including fence installation and vegetation removal
activities). As required by project permits, the
qualifications of a biological monitor may need to be
submitted to appropriate wildlife agencies for approval based on the resources the biologist will be monitoring.
Biological monitoring duties shall include, but are not limited to, conducting worker education training, verifying compliance with project permits, and ensuring
construction activities stay within designated work areas.
The biological monitor shall have the right to halt all activities in an affected area if a special- status species is identified in a work area and is in danger of injury or mortality. If work is halted by the biological monitor, work shall proceed only after the hazards to the individual is removed and there is no longer a risk to the individual, or the individual has been moved from harm’s way in
accordance with the project’s permits and/or
management/translocation plans. The biological monitor
shall take representative photographs of the daily activities and shall also maintain a daily log that documents general project activities and compliance with the project’s permit conditions. Non -compliance shall also be documented in the daily log, including any
measures that were
implemented to rectify the issue.
1255
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 6 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
BIO-2 Rare Plant Survey: A rare plant survey shall be conducted within suitable habitat during the appropriate blooming period for the lucky morning- glory (March through
September) and smooth tarplant (April through
September). The survey shall be conducted by a botanist or qualified biologist in accordance with the USFWS
Guidelines for Conducting and Reporting Botanical
Inventories for Federally Listed, Proposed, and Candidate Plants; the CDFW Protocols for Surveying and Evaluating Impacts to Special Status Native Plant Populatio
ns and
Natural Communities; and the CNPS Botanical Survey
Guidelines of the CNPS. One survey shall be conducted
during a time of the year that overlaps with all blooming periods (April through September).
If these species are observed during the rare plant survey, individual plants or populations shall be marked with GPS for mapping purposes. If any of these special -status plant species are detected in the ORSC site and Offsite
Improvement Area and impacts to these species are
unavoidable and impacts would result in deleterious
effects to the regional population of the species, the City shall consult with CDFW to develop a mitigation plan or additional avoidance and minimization measures to ensure impacts t
o these plant species are minimized to the
maximum extent practicable. Examples of measures that
may be implemented after consultation with CDFW include establishing a no -disturbance buffer around locations of individuals or a population, or additional monitoring
requirements during construction of the ORSC and Offsite Improvement Area.
City of Ontario
Planning
Department and
Qualified
Biologist/Botanist
Prior to the start
of ground-
disturbing
activities from
March through
September
City of Ontario
Planning
Department
1256
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 7 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
BIO-3 Burrowing Owl Management Plan: A live burrowing owl was documented in the ORSC site and Offsite Improvement Area during a biological survey conducted in September
2023, at which time the individual could have been
migrating, arriving for the winter, or late in leaving its summer breedin g grounds. Additionally, suitable
burrowing owl habitat is present throughout the ORSC site and Offsite Improvement Area. In order to offset potential project-related impacts to burrowing owl and its habitat a Burrowing
Owl Management Plan (BOMP) shall be
developed by a qualified Project biologist who has at least three (3) years of experience working with and/or
managing burrowing owls on project sites. The BOMP shall outline project -specific protection measures that ar e in accordance with CDFW’s Staff Report on Burrowing Owl
Mitigation (Staff Report; CDFG 2012). The BOMP shall also identify protection measures to be implemented should
the species be found on the ORSC site or Offsite
Improvement Areas at any time of the year (i.e., migration periods, breeding/summer, and wintering). The BOMP shall outline specific pre -
construction survey methods and
timing in accordance with the Staff Report and shall include instruction on survey requirements should there be a lapse in construction or project activities. The BOMP shall include project activities before which pre-
construction survey
requirements shall be required (such as grading, vegetation removal, and fence installation). Mitigation methods
outlined in the BOMP shall include, but not be limited to, establishment of no -disturbance buffers around potential or occupied burrowing owl burrows, additional biological monitoring requirements during project activities, and
passive relocation during the burrowing owl non -breeding season (September 1 through January 31, annually).
Regular reporting timeframes and requirements for
communication with CDFW shall also be clearly outlined in City of Ontario
Planning
Department and
Qualified Biologist
with at least 3 years
of experience
working with and/or
managing
burrowing owls on
project site.
Prior to the start
of ground-
disturbing
activities
City of Ontario
Planning
Department
1257
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 8 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
the BOMP. The BOMP shall be submitted to CDFW for
review and subject to CDFW approval prior to the start of Project ground-disturbing activities.
Additionally, the City of Ontario shall continue to carry out the requirements of its Memorandum of Agreement (MOA)
with IERCD (dated November 21, 2023) to mitigate the loss of suitable burrowing owl habitat resulting from the
Project. The MOA outlines th e collection of Habitat
Mitigation Fees by the City of Ontario that will be managed by a Land Trust for the acquisition, restoration,
rehabilitation, and maintenance of lands selected by the Land Trust to have long -term conservation value for
burrowing owl.
BIO-4 Preconstruction Surveys for Crotch Bumble Bee: If the Crotch bumble bee is no longer a Candidate or formally
listed species under the California ESA at the time ground- disturbing activities occur, then no additional protection measures are proposed for the species.
If the Crotch bumble bee is legally protected under the California ESA as a Candidate or Listed species at the time ground-
disturbing activities are scheduled to begin,
preconstruction surveys shall be conducted in accordance with CDFW’s Survey Considerati
ons for California ESA
Candidate Bumble Bee the season immediately prior to
project-related ground disturbing activities (including but not limited to vegetation clearing, fence installation, and grading). A minimum of three Crotch bumble bee
preconstruction surveys shall be conducted at two- to four- week intervals during the colony active period (April
through August) when Crotch bumble bees are most likely to be detected. Nonlethal, photo voucher surveys shall be completed by a biologist who holds a Memor andum of
Understanding to capture and handle Crotch bumble bee
City of Ontario and
Qualified Biologist
Prior to the start
of ground-
disturbing
activities if the
Crotch bumble
bee is legally
protected under
the California ESA
as a Candidate or
Listed species at
the time ground-
disturbing
activities are
scheduled to
begin
City of Ontario
Planning
Department
1258
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 9 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
(if nesting and chilling protocol is to be utilized) or by a CDFW-approved biologist experienced in identifying native bumble bee species (if surveys are restricted to visual surveys that will provide high -resolution photo
documentation for species verification). The surveyor shall walk through all areas of suitable habitat focusing on areas with floral resources. Surveys shall be completed at a
minimum of one person-hour of searching per three acres of suitable habitat during suitable weather conditions
(sustained winds less than 8 mph, mostly sunny to full sun, temperatures between 65 and 90ºF) at an appropriate time of day for detection (at least an hour after sunrise and at least two hours before sunset, though ideally between 9:00 a.m. and 1:00 p.m.)
If Crotch bumble bees are detected, CDFW shall be notified by the designated biologist as further coordination may be required to avoid or mitigate certain impacts. At a
minimum, two nesting surveys shall be conducted with
focus on detecting active nesting colonies within one week and 24 hours immediately prior to ground disturbing
activities that are scheduled to occur during the flight season (February through October). If an active Crotch
bumble bee nest is detected, an appropriate no
disturbance buffer zone (including foraging resources and flight corridors essential for supporting the colony) shall be established around the nest to reduce the risk of
disturbance or accidental take and the designated biologist shall coordinate with CDFW to determine if an Incidental Take Permit under Section 2081 of the California ESA will be required. Nest avoidance buffers may be removed at the completion of the flight season and/or once the qualified biologist deems the nesting colony is no longer active and CDFW has provided concurrence of that determination. If no nests are found but the species is present, a full -time 1259
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 10 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
qualified biological monitor shall be present during
vegetation or ground -disturbing activities that are
scheduled to occur during the queen flight period
(February through March), colony active period (March
through September), and/or gyne flight period (September through October). Because bumble bees move nest sites
each year, two preconstruction nesting surveys shall be required during each subsequent year of construction,
regardless of the previous year’s findings, whenever
vegetation and ground -disturbing activities are scheduled to occur during the flight season if nesting and foraging habitat is still present or has re-established.
BIO-5 Bat Management Plan: A Bat Management Plan shall be prepared by a qualified bat biologist no less than one year prior to the commencement of project- related activities (including, but not limited to, structure removal or
demolition, tree removal, grading, and vegetation removal) that shall include specific avoidance and minimization
measures to reduce impacts to roosting bats.
The project-specific Bat Management Plan may include any of the following as necessary and appropriate: additional habitat assessments of inaccessible areas that would be directly or indirectly impacted during Project activities, emergence and/or acoustic surveys for bats during the
maternity season (April 1 through August 31) to assess the potential for bat maternity roosts in the ORSC site and Offsite Improvement Area, and preconstruction surveys for roosting bats including acoustic monitoring. The Bat
Management Plan shall also include recommendations to
minimize impacts to roosting bats, including the
implementation of no -disturbance buffers, tree - and cliff- swallow nest removal protocols, passive exclusion of bats outside of the maternity and hibernati on seasons (if
City of Ontario and
Qualified Bat
Biologist
No less than one
year prior to the
start of ground-
disturbing
activities
City of Ontario
Planning
Department
1260
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 11 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
impacts are unavoidable), and/or species -specific
replacement alternative roosting habitat.
BIO-6 Tree Avoidance and Removal Process. If trees are
scheduled to be removed (e.g., relocating/modified (i.e., trimming) that were determined to be suitable for bat
roosting, these activities shall be scheduled during one of the seasonal periods of bat activity listed below, and when evening temperatures are not below 45ºF and rain is not over 0.5 inch in 24 hours:
• September 1 to October 31 (preferred): This is after the maternity season but prior to winter torpor.
• February 15 to March 31: After winter torpor but prior to the start of the maternity season.
1. If trees with suitable bat roosting habitat are scheduled for removal or relocation outside of the maternity
season, tree removal during the time periods and
weather parameters described above using the two-step
method shall be conducted:
a. Prior to the two -step method, as much as feasible,
vegetation and trees within the area that are not
suitable for roosting bats shall be removed first to
provide a
disturbance that might reduce the
likelihood of bats using the habitat.
b. Two-step tree removal shall occur over two
consecutive days under the supervision of a qualified
bat biologist. On Day 1, small branches and small limbs containing no cavity, crevice or exfoliating bark
habitat on habitat trees (or outer fronds in the case of palm trees), as identified by a qualified bat biologist are removed first, using chainsaws only (i.e., no
City of Ontario,
Qualified Bat
Biologist, and
Construction
Contractor
Prior to ground-
disturbing-
activities between
September 1 and
October 31 or
February 15 and
March 31, if trees
are scheduled to
be removed
City of Ontario
Planning
Department
1261
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 12 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
dozers, backhoes). The following day (Day 2), the
remainder of the tree is to be felled/removed. (The
intention of this method is to disturb the tree with
noise and vibration and branch removal on Day 1. This
should cause any potentially present day -roosting
bats to abandon the roost tree after they emerge for
nighttime foraging. Removing the tree quickly the
next consecutive day should avoid reoccupation of the
tree by bats).
2. If tree removal/modification must occur during the
maternity season (April 1 to August 31), a qualified bat biologist shall conduct a focused emergence survey(s) of the tree(s) within 48 hours of scheduled work. If a
maternity roost is located, whether sol itary or colonial, that roost shall remain undisturbed until after the
maternity season or until a qualified biological monitor has determined the roost is no longer active.
BIO-7 Delhi Sands Flower -Loving Fly Habitat Suitability Assessment: Prior to the start of ground -disturbing
activities (including vegetation removal and fence
installation activities), a habitat assessment shall be performed within the ORSC site and Offsite Improvement
Area and adjacent areas by a USFWS -permitted biologist with a 10(a)(1)(A) permit to conduct surveys for Delhi sands flower-
loving fly and with extensive knowledge of the
species. The purpose of the habitat assessment will be to determine the presence of suitable habitat for the species in the ORSC site and Offsite Improvement Area and
adjacent areas as well as ascertain the potential for the species to occur on or adjacent to the ORSC site and Offsite Improvement Area. The habitat assessment shall include a site
walkover, a check of adjacent empty lots for
comparison of habitat quality to the ORSC site and Offsite Improvement Area, photographs to document the site
City of Ontario and
USFWS-Permitted
Biologist with a
10(a)(1)(A) permit
to conduct surveys
for Delhi sands
flower-loving fly
Prior to ground-
disturbing
activities
City of Ontario
Planning
Department
1262
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 13 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
conditions, and characterizing the type and quality of the habitats within the ORSC site and Offsite Improvement
Area with respect to Delhi sands flower-loving fly.
At the conclusion of the habitat assessment, a brief report of findings as well as recommendations on whether
focused surveys must be conducted shall be prepared by
the USFWS -permitted biologist. The report shall also
include any additional project -specific avoidance,
minimization, and mitigation measure recommendations
for the species. The City shall follow the recommendations identified in the report of findings.
If Delhi sands flower- loving fly is present in the ORSC site and Offsite Improvement Area and impacts to the species are unavoidable, then the City must initiate consultation with USFWS under either Section 7 or 10 of the federal ESA.
If suitable habitat is identified in the ORSC site and Offsite Improvement Area, then the City of Ontario will continue to carry out the requirements of its MOA with IERCD to
mitigate for loss of Delhi Sands flower- loving fly habitat.
This MOA outlines the collection of Habitat Mitigation Fees by the City of Ontario that will be managed by a Land Trust for the acquisition, restoration, rehabilitation, and
maintenance of lands selected by the Land Trust to have long-
term conservation value for species such as Delhi
Sands flower- loving fly. Up to 25 -percent of the total Mitigation Fee collected may be used for the recovery of the Delhi Sands
flower-loving fly.
BIO-8 Preconstruction Survey for Nesting Birds: If construction or other project activities are scheduled to occur during the nesting bird and raptor season (generally February 1
through August 31), a preconstruction nesting bird and
raptor survey shall be conducted by a qualified avian
City of Ontario and
Qualified Avian
Biologist
No more than
three days prior
to ground-
disturbing
activities
City of Ontario
Planning
Department
1263
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 14 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
biologist to ensure that active bird nests will not be
disturbed or destroyed. The survey shall be completed no more than three days prior to initial ground disturbance.
The nesting bird survey shall include the ORSC site and Offsite Improvement Area and adjacent areas where
Project activities have the potential to affect active nests, either directly or indirectly, due to construction activity, noise, human activity, or ground disturbance.
If an active nest is identified, a qualified avian biologist shall establish an appropriately sized nondisturbance buffer
around the nest using flagging or staking. Construction activities shall not occur within any non-disturbance buffer zones until the n est is deemed inactive by the qualified avian biologist. If initial ground -disturbing activities are scheduled during the nesting bird season, then a biological monitor shall be present during all vegetation removal
activities to ensure no impacts to nesting birds occur.
BIO-9 Biological Resources Best Management Practices: The construction contractor(s) shall implement the following construction best management practices during ground
disturbing activities:
• To prevent encroachment into areas immediately
adjacent to the Cucamonga Creek Flood Control Channel,
temporary fencing should be installed along the eastern perimeter of the ORSC site.
• Confine all work activities to a predetermined work area.
• To prevent inadvertent entrapment of wildlife during the construction phase of the ORSC, all excavated, steep -
walled holes or trenches more than two feet deep shall
be covered at the close of each working day by plywood
or similar materials. If the trenches cannot be closed, one City of Ontario and
Construction
Contractor
During ground-
disturbing
activities
City of Ontario
Planning
Department
1264
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 15 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
or more escape ramps constructed of earthen fill or
wooden planks shall be installed. Before such holes or
trenches are filled, they should be thoroughly inspected for trapped animals.
• Wildlife are often attracted to burrow - or den- like structures such as pipes and may enter stored pipes and become trapped or injured. To prevent wildlife use of
these structures, construction pipes, culverts, or similar structures with a diameter of four inches or greater shall be capped while stored onsite.
• Food-related trash items such as wrappers, cans, bottles, and food scraps shall be disposed of in securely closed containers and removed at least once a week from the
construction site.
• Use of rodenticides and herbicides on the ORSC site shall be implemented in a manner that reduces the potential
for primary or secondary poisoning of non-target species.
This is necessary to prevent poisoning of non -target
species, including special -status
species, and the
depletion of prey populations on which they depend. Use of such compounds shall observe label and other
restrictions mandated by the USEPA, California
Department of Food and Agriculture, and other state and federal legislation. If rodent control must be conducted, zinc phosphide shall be used because it has a proven
lower risk to predatory wildlife.
Cultural Resources
CUL-1 Prior to the start of construction, the Project Proponent shall retain a qualified professional archaeologist to
monitor all ground -disturbing activities associated with construction of the ORSC site and Offsite Improvement
Area. Monitoring is not required for placement of
City of Ontario and
Qualified
Professional
Archaeologist
Prior to start of
construction
City of Ontario
Planning/Building
Department
1265
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 16 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
equipment or fill inside excavations that were monitored, above-ground construction activities, or redistribution of soils that were previously monitored (such as the return of stockpiles to use in backfilling). The Monitoring
Archaeologist shall meet or w ork under the direct
supervision of someone meeting the Secretary of the
Interior’s professional qualifications standards for
prehistoric and historic archaeology. The archaeologist shall be present at a pre -grading meeting(s), establish procedures for arc heological resource monitoring during grading and construction, and establish, in conjunction with the City, procedures to temporarily halt or redirect all work to allow the sampling, identification, and evaluation of all resources as that are encountered by the
archaeologist. If archeological features are discovered, the archeologist shall report such findings to the Ontario
Planning Director. If the archeological resources are found to be significant, the archeologist shall determine the appropriate actions, in conjunction with the City, that shall be taken for exploration and/or salvage in compliance with CEQA standards.
Geology and Soils
GS-1 Prior to grading, a Paleontological Resources Mitigation and Monitoring Plan (PRMMP) shall be prepared by a Qualified Paleontologist meeting the standards of Society of
Vertebrate Paleontology (2010). The PRMMP shall discuss the laws and regulations for th
e protection of
paleontological resources, the significance of fossils, and protocol to follow in case a discovery is made. The PRMMP shall also outline the duties of paleontological monitoring onsite, including the salvaging and preparation of fossils and the final submission of all paleontological resources to an accredited museum or facility for curation.
City of Ontario and
Qualified
Paleontologist
Prior to the start
of grading
City of Ontario
Planning/Building
Department
1266
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 17 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
GS-2 During excavations exceeding depth of approximately 5 to 10 feet below ground surface, a qualified paleontological monitor shall be present during construction activities to spot check the sediments and depths of excavations to
determine the geologic unit s encountered. If
paleontological resources are discovered, full -time
monitoring shall be required during grading, as identified in the Paleontological Resources Monitoring and Mitigation Plan.
City of Ontario and
Qualified
Paleontologist
Monitor
During
construction and
grading activities
City of Ontario
Planning/Building
Department
GS-3 In the event of any fossil discovery, regardless of depth or geologic formation, construction work shall halt within a 50- foot radius of the find until its significance can be
determined by a qualified paleontologist. Significant fossils shall be recovere
d, prepared to the point of curation,
identified by qualified experts, listed in a database to facilitate analysis, and deposited in a designated
paleontological curation facility in accordance with the standards of the Society of Vertebrate Paleontology (2010).
A regional repository shall be identified by the City Council and a curatorial arrangement shall be signed prior to
collection of the fossils.
City of Ontario and
Qualified
Paleontologist
During
construction
City of Ontario
Planning/Building
Department
Greenhouse Gas Emissions
GHG-1 The City of Ontario shall require proposed buildings within the ORSC site to be all electric, with electricity to be the only permanent source of energy for all nonemergency building energy needs, including but not limited to water heating; mechanical equi
pment; and heating, ventilation, and air
conditioning (HVAC) (i.e., space-heating and space cooling).
All major appliances (e.g., dishwashers, refrigerators, and water heaters) provided/installed shall be electric-powered EnergyStar certified or an equival ent energy efficiency where applicable. The only exception to this measure shall be limited to commercial cooking uses. Prior to issuance of building permits for development projects, applicants shall provide plans that show the aforementioned requirements City of Ontario and
Future Project
Applicants
Prior to issuance
of the certificate
of occupancy for
project buildings
City of Ontario
Planning/Building
Department
1267
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 18 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
to the City of Ontario Planning Department. Prior to issuance of the certificate of occupancy, the City of Ontario Building Department shall verify installation of the electric-powered EnergyStar or equivalent appliances.
GHG-2 The City of Ontario shall require proposed buildings and parking areas within the ORSC site to include on -site
renewable energy generation systems. Proposed buildings shall include photovoltaic (PV) and battery energy storage systems compliant with the Pre scriptive Requirements of the California Building Standards Code, Part 6, California Energy Code. Proposed buildings may substitute alternative renewable energy generation technology (e.g., wind) for PV systems; however, that alternative generation technology system shall be sized to provide annual electricity equal to what would be provided by a PV system for that building compliant with the Prescriptive Requirements of the
California Building Standards Code, Part 6, California Energy Code. Proposed parking areas shall include a PV system or alternative renewable energy generation system (e.g., wind) to help offset electricity demand generated by electric vehicle charging. Prior to issuance of building permits for development projects, applicants shal l provide plans that show the aforementioned requirements to the City of
Ontario Planning Department. Prior to issuance of the
certificate of occupancy, the City of Ontario Building
Department shall verify installation of the PV and battery energy storage systems or alternative renewable energy
generation systems.
City of Ontario and
Future Project
Applicants
Prior to issuance
of the certificate
of occupancy for
project buildings
City of Ontario
Building/ Planning
Department
GHG-3 The City of Ontario shall require that the parking lots and parking structure install electric vehicle spaces in
compliance with the voluntary Tier 2 standards under
Section A5.106.5.3.2 of the Non -residential Voluntary
Measures in the 2022 California Green Building Standards Code. All site plans submitted to the City of Ontario Planning City of Ontario and
Future Project
Applicants
Prior to issuance
of the certificate
of occupancy for
project buildings
City of Ontario
Planning/Building
Department
1268
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 19 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
Department shall illustrate compliance with Section
A5.106.5.3.2.
GHG-4 The City of Ontario shall require applicants to design and construct buildings in Planning Areas 2, 3, and 4 to achieve a 100-point score with the 2022 Community Climate Action Plan (CCAP), Table 6, “Screening Table for Implementing GHG Performance Standa
rds for Commercial, Office,
Medical, Hotel, Industrial, and Retail Development, 2030.” City of Ontario and
Future Project
Applicants
Prior to issuance
of the certificate
of occupancy for
project buildings
City of Ontario
Planning
Department
Hazards and Hazardous Materials
See Mitigation Measures TRAF-3, below.
Noise
N-1 The construction contractor shall implement the following measures during construction activities on the ORSC site and Offsite Improvement Area. These measures shall be
identified on demolition, grading, and/or building permits.
• Prior to construction activities that warrant nighttime construction (e.g., infrastructure work, concrete pours, etc.), the construction contractor shall install noise
pathway controls, including noise barriers and enclosures free from gaps and holes, whic h shall be placed as close as possible to construction areas. The temporary noise
barrier shall be a sufficient height to block the direct line- of-sight between the on-site construction areas and off- site noise sensitive receptors and shall be a minimum of 6 feet tall and shall be constructed out of wood or other materials with a minimum surface weight of
approximately 2.5 pounds per square foot.
• Construction equipment operating on a site shall be
equipped with the appropriate manufacturer’s noise
reduction devices, including but not limited to a
manufacturer’s muffler (or equivalently rated material) that is free of rust, holes, and exhaust leaks.
City of Ontario’s
Construction
Contractor
During
construction
activities
City of Ontario
Planning/Building
Department
1269
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 20 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
• Noise from construction devices with internal
combustion engines shall be mitigated by ensuring that
the engine's housing doors are kept closed, and by using noise-insulating material mounted on the engine housing that does not interfere with the manufactu rer's
guidelines for engine operation or exhaust.
• Portable compressors, generators, pumps, and other
such devices shall be covered with noise-insulating fabric to the maximum extent possible that does not interfere
with the manufacturer's guidelines for engine operation or exhaust, and shall further reduc e noise by operating the device at lower engine speeds during the work to the maximum extent possible.
• Idling on -site of heavy -duty diesel vehicles with Gross Vehicle Weight Rating of 10,000 pounds shall be limited to no longer than five minutes while parking, standing, or stopping, as per 13 California Code of Regulations Section 2485, Airborne Toxic Control Measure to Limit Diesel -
Fueled Commercial Motor Vehicle Idling.
• Quieter back-up alarms on construction equipment shall be used whenever feasible.
• Construction vehicles shall be strategically positioned to minimize operation near receptors and avoiding tailgate slamming to the extent possible.
NOI-3 HVAC Equipment, Planning Areas 2, 3, 4, and 7 Buildings. An acoustics study shall be provided to the City of Ontario prior to building permit issuance for new structures with HVAC systems in Planning Areas 2, 3, 4, and 7 that documents compliance with the overnight noise levels in the City’s municipal code (45 dBA at single -family residences from 10:00 pm to 7:00 am). HVAC equipment for the indoor
City of Ontario and
Future Project
Applicants
Prior to building
permit issuance
for new structures
with HVAC
systems in
Planning Areas 2,
3, 4, and
City of Ontario and
Future Project
Applicants
1270
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 21 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
athletic facility shall be designed and/or placed to yield a sound level less than 65 dBA at 50 feet to ensure compliance would result in a noise level of approximately 44 dBA at residential land uses to the east along Plymouth Avenue.
Noise associated wit h
operation of heating and cooling
equipment shall be minimized by the design and strategic placement of equipment.
Transportation
TRAF-1a Commercial/Hospitality TDM Measures. Applicants for commercial and hotel development in Planning Areas 2, 3, and 4 shall prepare Transportation Demand Management
(TDM) measures analyzed under a VMT -reduction
methodology consistent with the California Air Pollution Control Officers Association’s (CAPCOA) Final Handbook
for Analyzing Greenhouse Gas Emission Reductions,
Assessing Climate Vulnerabilities, and Advancing Health and Equity (2021) and approved by the City of Ontario.
Measures shall include but are not limited to:
• Implement a voluntary commute trip reduction
program for employees.
• Implement an employee parking cash -out program for
employees.
• Collaborate with the City to support transit service
expansion.
• Comply with requirements detailed in the Parking
Management Plan, including providing parking
validation for retail and hospitality visitors.
City of Ontario and
Future Project
Applicants
Prior to issuance
of building
permits
City of Ontario
Planning
Department
TRAF-3 Prior to issuance of grading permits, the construction contractor shall prepare and submit a construction
management plan. The construction management plan
shall be approved by the City of Ontario Public Works
City of Ontario’s
Construction
Contractor and
Public Works
Prior to issuance
of grading permits
City of Ontario
Planning
Department and
Public Works
1271
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 22 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
Department. The construction management plan shall
identify construction hours, truck routes, travel patterns for haul routes, staging and parking areas, staggered
worker arrival times, and safety procedures for
pedestrians and cyclists. The construction m anagement
plan shall prohibit the use of heavy construction vehicles during peak hours. The plan shall also require the
construction contractor to implement the following
measures during construction activities, which shall be discussed at the pre-grading conference/meeting:
• Minimize obstruction of through -traffic lanes and
provide temporary traffic controls, such as a flag person, during all roadway improvement activities to maintain
adequate access for emergency vehicles and personnel.
• Develop a traffic plan to minimize interference for
emergency vehicles and personnel from demolition and
construction activities (e.g., advanced public notice of demolition and construction activities).
Tribal Cultural Resources
TCR-1 Tribal Cultural Resources Monitoring. The project archaeologist, in consultation with interested tribes and the City of Ontario, shall develop an archaeological
monitoring plan (AMP) to address the details, timing, and responsibility of archaeological and cultural activities that will occur on the ORSC site and Offsite Improvement Area.
Details in the AMP shall include:
1. Project-related ground disturbance (including, but not limited to, brush clearing, grading, trenching, etc.) and development scheduling;
2. The development of a rotating or simultaneous
schedule in coordination with the developer and the
project archeologist for designated Native American
City of Ontario
Planning
Department in
coordination with
Project Archeologist
and Interested
Tribes
Prior to and
during
construction
City of Ontario
Planning
Department
1272
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 23 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
Tribal Monitors from the consulting tribes during
grading, excavation, and ground-disturbing activities on the site: including the scheduling, safety requirements, duties, scope of work, and Native American Tribal
Monitors’ authority to stop and redirect grading
activities in coordination with all project archaeologists.
Tribes shall coordinate as to Tribal Monitoring
concurrent with development;
3. The protocols and stipulations that the City, Tribes, and project archaeologist will follow in the event of
inadvertent cultural resources discoveries, including any newly discovered cultural resource deposits that shall
be subject to a cultural resources evaluation.
At least 30 days prior to application for a grading permit and before any brush clearance, grading, excavation,
and/or ground -disturbing activities on the site, the
developer shall retain a tribal cultural monitor to monitor all ground-disturbing activities in an effort to identify any unknown archaeological resources.
Pursuant to the AMP, a tribal monitor from the consulting tribes shall be present during the initial grading activities.
If tribal resources are found during grubbing activities, the tribal monitoring shall be present during site grading
activities.
TCR-2 Treatment and Disposition of Cultural Resources. In the event that Native American cultural resources are
inadvertently discovered during the course of any ground- disturbing activities, including but not limited to brush clearance, grading, trenching, etc., at the ORSC site or Offsite Improvement Area, the following procedures will be carried out for treatment and disposition of the
discoveries:
Ontario’s
Construction
Contractor in
coordination with
Project Archeologist
and Interested
Tribes
During
construction
City of Ontario
Planning
Department/Building
Department
1273
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 24 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
1. Temporary Curation and Storage: During the course of construction, all discovered resources shall be
temporarily curated in a secure location on-site or at the offices of the project archaeologist. The removal of any artifacts from the ORSC site and Offsit e Improvement
Area will need to be thoroughly inventoried with tribal monitor oversight of the process;
2. Treatment and Final Disposition: The landowner(s) shall relinquish ownership of all cultural resources, including sacred items, burial goods, and all archaeological
artifacts and nonhuman remains as part of the required
mitigation for impacts to cultural resources. The City
shall relinquish the artifacts through one or more of the following methods:
a. Accommodate the process for on -site reburial of
the discovered items with the consulting Native
American tribes or bands. This shall include
measures and provisions to protect the future
reburial area from any future impacts. Reburial shall
not occur until all cataloging, basic analysis, other
analyses as recommended by the project
archaeologist and approved by consulting tribes,
and basic recordation have been completed; all
documentation should be at a level of standard
professional practice to allow the writing of a report
of professional quality;
b. A curation agreement with an appropriate qualified
repository in San Bernardino County that meets
federal standards per 36 CFR Part 79, and therefore
the resource would be professionally curated and
made available to other archaeologists/researchers
for fu rther study. The collections and associated
1274
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 25 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
records shall be transferred, including title, to an
appropriate curation facility in San Bernardino
County, to be accompanied by payment of the fees
necessary for permanent curation;
c. For purposes of conflict resolution, if more than one Native American tribe or band is involved with the
project and cannot come to an agreement as to the
disposition of cultural materials, materials shall be
curated at the San Bernardino County Museum by
default;
d. At the completion of grading, excavation, and
ground-disturbing activities on the site, a Phase IV
Monitoring Report shall be submitted to the City
documenting monitoring activities conducted by
the project archaeologist and Native Tribal
Monitors within 6 0 days of completion of grading.
This report shall document the impacts to the
known resources on the property; describe how
each mitigation measure was fulfilled; document
the type of cultural resources recovered and the
disposition of such resources; pro vide evidence of
the required cultural sensitivity training for the
construction staff held during the required
pregrade meeting; and, in a confidential appendix,
include the daily/weekly monitoring notes from the
archaeologist. All reports produced will b e
submitted to the City, County Museum, and
consulting tribes.
TCR-3 Unanticipated Discovery of Human Remains and
Associated Funerary or Ceremonial Objects. Native
American human remains are defined in Public Resources
Code Section 5097.98(d)(1) as an inhumation or
cremation, and in any state of decomposition or skeletal City of Ontario’s
Construction
Contractor in
coordination with
Interested Tribes
During
construction
City of Ontario
Planning
Department
1275
MITIGATION MONITORING & REPORTING PROGRAM
Ontario Residence Inn and Aloft Hotel/File Nos.: PDEV25-007 26 Mitigation Measure
Responsibility for
Implementation Timing
Responsibility for
Monitoring
Monitor
(Signature Required)
(Date of
Compliance)
completeness. Funerary objects, called associated grave goods in Public Resources Code Section 5097.98, are also to be treated according to this statute.
a) If Native American human remains and/or grave
goods are discovered or recognized on the ORSC site,
then Public Resource Code 5097.9 as well as Health
and Safety Code Section 7050.5 shall be followed.
b) Human remains and grave/burial goods shall be
treated alike per California Public Resources Code
section 5097.98(d)(1) and (2).
c) Preservation in place (i.e., avoidance) is the preferred manner of treatment for discovered human remains
and/or burial goods.
d) Any discovery of human remains/burial goods shall be kept confidential to prevent further disturbance.
1276
RESOLUTION NO. PC25-059
A RESOLUTION OF THE PLANNING COMMISSION OF THE CITY OF
ONTARIO, CALIFORNIA, APPROVING FILE NO. PDEV25-007, A 226 ROOM HOTEL TOTALING 183,609 SQUARE FEET (INCLUDING A
158,272 SQUARE FOOT HOTEL AND 25, 337 SQUARE FEET OF
COMMERCIAL USES) ON 3.41 ACRES OF LAND LOCATED SOUTH OF
RIVERSIDE DRIVE AND EAST OF HELLMAN AVENUE WITHIN THE CCS (CONVENTION CENTER SERVICES COMMERCIAL) ZONING
DISTRICT, AND MAKING FINDINGS IN SUPPORT THEREOF —APN:
(APN: 218-111-67, 218-111-68, AND 218-111-69).
WHEREAS, ONTARIO RANCH HOTEL, LLC (hereinafter referred to as Applicant) has filed an Application for the approval of a Development Plan, File No. PDEV25 -007, as described in the title of this Resolution (hereinafter referred to as Application or Project); and
WHEREAS, the Application applies to 3.41 acres of land generally located at the northeast corner of Hellman Avenue and “C” Street, within the Ontario Sports Empire in the CCS (Convention Center Services Commercial ) zoning district , and is presently vacant; and
WHEREAS, the property to the north, east, and south of the Project site is within the CCS (Convention Center Services Commercial) zoning district and is vacant. The property to the east is within the CCS (Convention Center Services Commercial) zoning district, and is developed with baseball stadium; and
WHEREAS, the proposed Project will construct a 226 room hotel totaling 183,609 square feet (including a 158,272 square foot hotel and 25,337 square feet of commercial use) and will provide destination dining, retail, fitness center, public gathering spaces and additional guest amenities; and
WHEREAS, the Ontario Regional Sports Complex Environmental Impact Report (State Clearinghouse No. 2023110328) was certified on July 16, 2024 (hereinafter referred to as Certified EIR), in which development and use of the Project site was discussed; and
WHEREAS, the Planning Director of the City of Ontario prepared and approved for attachment to the certified Environmental Impact Report, an Addendum to the Certified EIR (hereinafter referred to as EIR Addendum) in accordance with the requirements of the California Environmental Quality Act of 1970, together with State and local guidelines implementing said Act, all as amended to date (collectively referred to as CEQA); and
1277
Planning Commission Resolution
File No. PDEV25-007
November 25, 2025