RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 3 HOUR STORM EVENT
PROJECT: WORLD MUSEUM EXIST 10 YR EVENT - SOUTH
CONCENTRATION POINT: 1
BY: IES R. BAZUA, DATE 3/28/2025
EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.23
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.42
UNIT TIME -PERCENT OF LAG 1202.0
TOTAL ADJUSTED STORM RAIN -INCHES 1.50
CONSTANT LOSS RATE-in/hr 0.58
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 5
0.08 1.3
0.234
0.58 0.21
0.02 0.03
8.63 2
10 0.17
1.3 0.234
0.58 0.21
0.02 0.03
8.63 3
15 0.25
1.1 0.198
0.58 0.18
0.02 0.02
7.31 4
20 0.33
1.5 0.270
0.58 0.24
0.03 0.03
9.96 5
25 0.42
1.5 0.270
0.58 0.24
0.03 0.03
9.96 6
30 0.50
1.8 0.324
0.58 0.29
0.03 0.04
11.96 7
35 0.58
1.5 0.270
0.58 0.24
0.03 0.03
9.96 8
40 0.67
1.8 0.324
0.58 0.29
0.03 0.04
11.96 9
45 0.75
1.8 0.324
0.58 0.29
0.03 0.04
11.96 10
50 0.83
1.5 0.270
0.58 0.24
0.03 0.03
9.96 11
55 0.92
1.6 0.288
0.58 0.26
0.03 0.04
10.63 12
60 1.00
1.8 0.324
0.58 0.29
0.03 0.04
11.96 13
65 1.08
2.2 0.396
0.58 0.36
0.04 0.05
14.61 14
70 1.17
2.2 0.396
0.58 0.36
0.04 0.05
14.61 15
75 1.25
2.2 0.396
0.58 0.36
0.04 0.05
14.61 16
80 1.33
2.0 0.360
0.58 0.32
0.04 0.04
13.28 17
85 1.42
2.6 0.468
0.58 0.42
0.05 0.06
17.27 18
90 1.50
2.7 0.486
0.58 0.44
0.05 0.06
17.93 19
95 1.58
2.4 0.432
0.58 0.39
0.04 0.05
15.94 20
100
1.67 2.7
0.486
0.58 0.44
0.05 0.06
17.93 21
105
1.75 3.3
0.594
0.58 0.53
0.01 0.02
4.87 22
110
1.83 3.1
0.558
0.58 0.50
0.06 0.07
20.59 23
115
1.92 2.9
0.522
0.58 0.47
0.05 0.06
19.26 24
120
2.00 3.0
0.540
0.58 0.49
0.05 0.07
19.93 25
125
2.08 3.1
0.558
0.58 0.50
0.06 0.07
20.59 26
130
2.17 4.2
0.756
0.58 0.68
0.18 0.22
64.65 27
135
2.25 5.0
0.900
0.58 0.81
0.32 0.39
117.79
28 140
2.33 3.5
0.630
0.58 0.57
0.05 0.06
18.16 29
145
2.42 6.8
1.224
0.58 1.10
0.64 0.79
237.34
30 150
2.50 7.3
1.314
0.58 1.18
0.73 0.90
270.55
31 155
2.58 8.2
1.476
0.58 1.33
0.90 1.10
330.33
32 160
2.67 5.9
1.062
0.58 0.96
0.48 0.59
177.57
33 165
2.75 2.0
0.360
0.58 0.32
0.04 0.04
13.28 34
170
2.83 1.8
0.324
0.58 0.29
0.03 0.04
11.96 35
175
2.92 1.8
0.324
0.58 0.29
0.03 0.04
11.96 36
180
3.00 0.6
0.108
0.58 0.10
0.01 0.01
3.99 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cuft)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cuft)
PEAK FLOW RATE (cfs)
0.36 0.04
1605.16
0.04 1591.89
1.10 2086
Plate E-2.2
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 6 HOUR STORM EVENT
PROJECT: WORLD MUSEUM EXIST 10 YR EVENT - SOL
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025
EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.23
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.42
UNIT TIME -PERCENT OF LAG 1202.0
TOTAL ADJUSTED STORM RAIN -INCHES 1.93
CONSTANT LOSS RATE-in/hr 0.581
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 5
0.08 0.5
0.116
0.58 0.10
0.01 0.01
4.27 2
10 0.17
0.6 0.139
0.58 0.13
0.01 0.02
5.13 3
15 0.25
0.6 0.139
0.58 0.13
0.01 0.02
5.13 4
20 0.33
0.6 0.139
0.58 0.13
0.01 0.02
5.13 5
25 0.42
0.6 0.139
0.58 0.13
0.01 0.02
5.13 6
30 0.50
0.7 0.162
0.58 0.15
0.02 0.02
5.98 7
35 0.58
0.7 0.162
0.58 0.15
0.02 0.02
5.98 8
40 0.67
0.7 0.162
0.58 0.15
0.02 0.02
5.98 9
45 0.75
0.7 0.162
0.58 0.15
0.02 0.02
5.98 10
50 0.83
0.7 0.162
0.58 0.15
0.02 0.02
5.98 11
55 0.92
0.7 0.162
0.58 0.15
0.02 0.02
5.98 12
60 1.00
0.8 0.185
0.58 0.17
0.02 0.02
6.84 13
65 1.08
0.8 0.185
0.58 0.17
0.02 0.02
6.84 14
70 1.17
0.8 0.185
0.58 0.17
0.02 0.02
6.84 15
75 1.25
0.8 0.185
0.58 0.17
0.02 0.02
6.84 16
80 1.33
0.8 0.185
0.58 0.17
0.02 0.02
6.84 17
85 1.42
0.8 0.185
0.58 0.17
0.02 0.02
6.84 18
90 1.50
0.8 0.185
0.58 0.17
0.02 0.02
6.84 19
95 1.58
0.8 0.185
0.58 0.17
0.02 0.02
6.84 20
100
1.67 0.8
0.185
0.58 0.17
0.02 0.02
6.84 21
105
1.75 0.8
0.185
0.58 0.17
0.02 0.02
6.84 22
110
1.83 0.8
0.185
0.58 0.17
0.02 0.02
6.84 23
115
1.92 0.8
0.185
0.58 0.17
0.02 0.02
6.84 24
120
2.00 0.9
0.208
0.58 0.19
0.02 0.03
7.69 25
125
2.08 0.8
0.185
0.58 0.17
0.02 0.02
6.84 26
130
2.17 0.9
0.208
0.58 0.19
0.02 0.03
7.69 27
135
2.25 0.9
0.208
0.58 0.19
0.02 0.03
7.69 28
140
2.33 0.9
0.208
0.58 0.19
0.02 0.03
7.69 29
145
2.42 0.9
0.208
0.58 0.19
0.02 0.03
7.69 30
150
2.50 0.9
0.208
0.58 0.19
0.02 0.03
7.69 31
155
2.58 0.9
0.208
0.58 0.19
0.02 0.03
7.69 32
160
2.67 0.9
0.208
0.58 0.19
0.02 0.03
7.69 33
165
2.75 1.0
0.232
0.58 0.21
0.02 0.03
8.55 34
170
2.83 1.0
0.232
0.58 0.21
0.02 0.03
8.55 35
175
2.92 1.0
0.232
0.58 0.21
0.02 0.03
8.55 36
180
3.00 1.0
0.232
0.58 0.21
0.02 0.03
8.55 37
185
3.08 1.0
0.232
0.58 0.21
0.02 0.03
8.55 38
190
3.17 1.1
0.255
0.58 0.23
0.03 0.03
9.40 39
195
3.25 1.1
0.255
0.58 0.23
0.03 0.03
9.40 40
200
3.33 1.1
0.255
0.58 0.23
0.03 0.03
9.40 41
205
3.42 1.2
0.278
0.58 0.25
0.03 0.03
10.26 42
210
3.50 1.3
0.301
0.58 0.27
0.03 0.04
11.11 43
215
3.58 1.4
0.324
0.58 0.29
0.03 0.04
11.96 44
220
3.67 1.4
0.324
0.58 0.29
0.03 0.04
11.96 45
225
3.75 1.5
0.347
0.58 0.31
0.03 0.04
12.82 46
230
3.83 1.5
0.347
0.58 0.31
0.03 0.04
12.82 47
235
3.92 1.6
0.371
0.58 0.33
0.04 0.05
13.67 48
240
4.00 1.6
0.371
0.58 0.33
0.04 0.05
13.67 49
245
4.08 1.7
0.394
0.58 0.35
0.04 0.05
14.53 50
250
4.17 1.8
0.417
0.58 0.38
0.04 0.05
15.38 51
255
4.25 1.9
0.440
0.58 0.40
0.04 0.05
16.24 52
260
4.33 2.0
0.463
0.58 0.42
0.05 0.06
17.09 53
265
4.42 2.1
0.486
0.58 0.44
0.05 0.06
17.95 54
270
4.50 2.1
0.486
0.58 0.44
0.05 0.06
17.95 55
275
4.58 2.2
0.510
0.58 0.46
0.05 0.06
18.80 56
280
4.67 2.3
0.533
0.58 0.48
0.05 0.07
19.66 2087
Plate E-2.2
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 6 HOUR STORM EVENT
PROJECT: WORLD MUSEUM EXIST 10 YR EVENT - SOL
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025
EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.23
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.42
UNIT TIME -PERCENT OF LAG 1202.0
TOTAL ADJUSTED STORM RAIN -INCHES 1.93
CONSTANT LOSS RATE-in/hr 0.581
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
57 285
4.75 2.4
0.556
0.58 0.50
0.06 0.07
20.51 58
290
4.83 2.4
0.556
0.58 0.50
0.06 0.07
20.51 59
295
4.92 2.5
0.579
0.58 0.52
0.06 0.07
21.37 60
300
5.00 2.6
0.602
0.58 0.54
0.02 0.03
7.88 61
305
5.08 3.1
0.718
0.58 0.65
0.14 0.17
50.61 62
310
5.17 3.6
0.834
0.58 0.75
0.25 0.31
93.34 63
315
5.25 3.9
0.903
0.58 0.81
0.32 0.40
118.98
64 320
5.33 4.2
0.973
0.58 0.88
0.39 0.48
144.62
65 325
5.42 4.7
1.089
0.58 0.98
0.51 0.62
187.35
66 330
5.50 5.6
1.297
0.58 1.17
0.72 0.88
264.27
67 335
5.58 1.9
0.440
0.58 0.40
0.04 0.05
16.24 68
340
5.67 0.9
0.208
0.58 0.19
0.02 0.03
7.69 69
345
5.75 0.6
0.139
0.58 0.13
0.01 0.02
5.13 70
350
5.83 0.5
0.116
0.58 0.10
0.01 0.01
4.27 71
355
5.92 0.3
0.069
0.58 0.06
0.01 0.01
2.56 72
360
6.00 0.2
0.046
0.58 0.04
0.00 0.01
1.71 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cuft)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cuft)
PEAK FLOW RATE (cfs)
0.34 0.03
1497.32
0.03 1484.94
0.88 2088
Plate E-2.2
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 24 HOUR STORM EVENT
PROJECT: WORLD MUSEUM EXIST 10 YR EVENT - SOl
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025
EFFECTIVE
RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.230
UNIT TIME -MINUTES 15
LAG TIME - MINUTES 0.42
UNIT TIME -PERCENT OF LAG 3606.1
TOTAL ADJUSTED STORM RAIN -INCHES 2.66
CONSTANT LOSS RATE-in/hr n/a
VARIABLE LOSS RATE (AVG) in/hr 0.5808
MINIMUM LOSS RATE (for var. loss) - in/hr 0.290
LOW LOSS RATE - DECIMAL 0.90
C 0.00538
PERCOLATION RATE (cfs) 0.00
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 15
0.25 0.2
0.021
1.026
0.019
0.002
0.00 2.36
2 30
0.50 0.3
0.032
1.014
0.029
0.003
0.00 3.53
3 45
0.75 0.3
0.032
1.002
0.029
0.003
0.00 3.53
4 60
1.00 0.4
0.043
0.990
0.038
0.004
0.01 4.71
5 75
1.25 0.3
0.032
0.978
0.029
0.003
0.00 3.53
6 90
1.50 0.3
0.032
0.967
0.029
0.003
0.00 3.53
7 105
1.75 0.3
0.032
0.955
0.029
0.003
0.00 3.53
8 120
2.00 0.4
0.043
0.944
0.038
0.004
0.01 4.71
9 135
2.25 0.4
0.043
0.932
0.038
0.004
0.01 4.71
10 150
2.50 0.4
0.043
0.921
0.038
0.004
0.01 4.71
11 165
2.75 0.5
0.053
0.910
0.048
0.005
0.01 5.89
12 180
3.00 0.5
0.053
0.899
0.048
0.005
0.01 5.89
13 195
3.25 0.5
0.053
0.887
0.048
0.005
0.01 5.89
14 210
3.50 0.5
0.053
0.876
0.048
0.005
0.01 5.89
15 225
3.75 0.5
0.053
0.865
0.048
0.005
0.01 5.89
16 240
4.00 0.6
0.064
0.855
0.057
0.006
0.01 7.07
17 255
4.25 0.6
0.064
0.844
0.057
0.006
0.01 7.07
18 270
4.50 0.7
0.074
0.833
0.067
0.007
0.01 8.24
19 285
4.75 0.7
0.074
0.822
0.067
0.007
0.01 8.24
20 300
5.00 0.8
0.085
0.812
0.077
0.009
0.01 9.42
21 315
5.25 0.6
0.064
0.801
0.057
0.006
0.01 7.07
22 330
5.50 0.7
0.074
0.791
0.067
0.007
0.01 8.24
23 345
5.75 0.8
0.085
0.780
0.077
0.009
0.01 9.42
24 360
6.00 0.8
0.085
0.770
0.077
0.009
0.01 9.42
25 375
6.25 0.9
0.096
0.760
0.086
0.010
0.01 10.60
26 390
6.50 0.9
0.096
0.750
0.086
0.010
0.01 10.60
27 405
6.75 1.0
0.106
0.740
0.096
0.011
0.01 11.78
28 420
7.00 1.0
0.106
0.730
0.096
0.011
0.01 11.78
29 435
7.25 1.0
0.106
0.720
0.096
0.011
0.01 11.78
30 450
7.50 1.1
0.117
0.710
0.105
0.012
0.01 12.96
31 465
7.75 1.2
0.128
0.700
0.115
0.013
0.02 14.13
32 480
8.00 1.3
0.138
0.691
0.124
0.014
0.02 15.31
33 495
8.25 1.5
0.160
0.681
0.144
0.016
0.02 17.67
34 510
8.50 1.5
0.160
0.671
0.144
0.016
0.02 17.67
35 525
8.75 1.6
0.170
0.662
0.153
0.017
0.02 18.85
36 540
9.00 1.7
0.181
0.653
0.163
0.018
0.02 20.02
37 555
9.25 1.9
0.202
0.644
0.182
0.020
0.02 22.38
38 570
9.50 2.0
0.213
0.634
0.192
0.021
0.03 23.56
39 585
9.75 2.1
0.223
0.625
0.201
0.022
0.03 24.73
40 600
10.00 2.2
0.234
0.616
0.211
0.023
0.03 25.91
41 615
10.25 1.5
0.160
0.607
0.144
0.016
0.02 17.67
42 630
10.50 1.5
0.160
0.599
0.144
0.016
0.02 17.67
43 645
10.75 2.0
0.213
0.590
0.192
0.021
0.03 23.56
44 660
11.00 2.0
0.213
0.581
0.192
0.021
0.03 23.56
45 675
11.25 1.9
0.202
0.573
0.182
0.020
0.02 22.38
46 690
11.50 1.9
0.202
0.564
0.182
0.020
0.02 22.38
47 705
11.75 1.7
0.181
0.556
0.163
0.018
0.02 20.02
48 720
12.00 1.8
0.192
0.548
0.172
0.019
0.02 21.20
49 735
12.25 2.5
0.266
0.539
0.239
0.027
0.03 29.45
50 750
12.50 2.6
0.277
0.531
0.249
0.028
0.03 30.62
51 765
12.75 2.8
0.298
0.523
0.268
0.030
0.04 32.98
52 780
13.00 2.9
0.309
0.515
0.278
0.031
0.04 34.16
53 795
13.25 3.4
0.362
0.508
0.326
0.036
0.04 40.05
54 810
13.50 3.4
0.362
0.500
0.326
0.036
0.04 40.05
55 825
13.75 2.3
0.245
0.492
0.220
0.024
0.03 27.09
56 840
14.00 2.3
0.245
0.485
0.220
0.024
0.03 27.09
57 855
14.25 2.7
0.287
0.478
0.259
0.029
0.04 31.80
58 870
14.50 2.6
0.277
0.470
0.249
0.028
0.03 30.62
59 885
14.75 2.6
0.277
0.463
0.249
0.028
0.03 30.62
60 900
15.00 2.5
0.266
0.456
0.239
0.027
0.03 29.45
61 915
15.25 2.4
0.255
0.449
0.230
0.026
0.03 28.27
62 930
15.50 2.3
0.245
0.442
0.220
0.024
0.03 27.09
63 945
15.75 1.9
0.202
0.435
0.182
0.020
0.02 22.38
64 960
16.00 1.9
0.202
0.429
0.182
0.020
0.02 22.38
65 975
16.25 0.4
0.043
0.422
0.038
0.004
0.01 4.71
66 990
16.50 0.4
0.043
0.416
0.038
0.004
0.01 4.71
67 1005
16.75 0.3
0.032
0.409
0.029
0.003
0.00 3.53
TH
2089
Plate E-2.2
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 24 HOUR STORM EVENT
PROJECT: WORLD MUSEUM EXIST 10 YR EVENT - SOl
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025
EFFECTIVE
RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.230
UNIT TIME -MINUTES 15
LAG TIME - MINUTES 0.42
UNIT TIME -PERCENT OF LAG 3606.1
TOTAL ADJUSTED STORM RAIN -INCHES 2.66
CONSTANT LOSS RATE-in/hr n/a
VARIABLE LOSS RATE (AVG) in/hr 0.5808
MINIMUM LOSS RATE (for var. loss) - in/hr 0.290
LOW LOSS RATE - DECIMAL 0.90
C 0.00538
PERCOLATION RATE (cfs) 0.00
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
68 1020
17.00 0.3
0.032
0.403
0.029
0.003
0.00 3.53
69 1035
17.25 0.5
0.053
0.397
0.048
0.005
0.01 5.89
70 1050
17.50 0.5
0.053
0.391
0.048
0.005
0.01 5.89
71 1065
17.75 0.5
0.053
0.385
0.048
0.005
0.01 5.89
72 1080
18.00 0.4
0.043
0.380
0.038
0.004
0.01 4.71
73 1095
18.25 0.4
0.043
0.374
0.038
0.004
0.01 4.71
74 1110
18.50 0.4
0.043
0.369
0.038
0.004
0.01 4.71
75 1125
18.75 0.3
0.032
0.363
0.029
0.003
0.00 3.53
76 1140
19.00 0.2
0.021
0.358
0.019
0.002
0.00 2.36
77 1155
19.25 0.3
0.032
0.353
0.029
0.003
0.00 3.53
78 1170
19.50 0.4
0.043
0.348
0.038
0.004
0.01 4.71
79 1185
19.75 0.3
0.032
0.343
0.029
0.003
0.00 3.53
80 1200
20.00 0.2
0.021
0.339
0.019
0.002
0.00 2.36
81 1215
20.25 0.3
0.032
0.334
0.029
0.003
0.00 3.53
82 1230
20.50 0.3
0.032
0.330
0.029
0.003
0.00 3.53
83 1245
20.75 0.3
0.032
0.326
0.029
0.003
0.00 3.53
84 1260
21.00 0.2
0.021
0.322
0.019
0.002
0.00 2.36
85 1275
21.25 0.3
0.032
0.318
0.029
0.003
0.00 3.53
86 1290
21.50 0.2
0.021
0.314
0.019
0.002
0.00 2.36
87 1305
21.75 0.3
0.032
0.311
0.029
0.003
0.00 3.53
88 1320
22.00 0.2
0.021
0.308
0.019
0.002
0.00 2.36
89 1335
22.25 0.3
0.032
0.305
0.029
0.003
0.00 3.53
90 1350
22.50 0.2
0.021
0.302
0.019
0.002
0.00 2.36
91 1365
22.75 0.2
0.021
0.299
0.019
0.002
0.00 2.36
92 1380
23.00 0.2
0.021
0.297
0.019
0.002
0.00 2.36
93 1395
23.25 0.2
0.021
0.295
0.019
0.002
0.00 2.36
94 1410
23.50 0.2
0.021
0.293
0.019
0.002
0.00 2.36
95 1425
23.75 0.2
0.021
0.292
0.019
0.002
0.00 2.36
96 1440
24.00 0.2
0.021
0.291
0.019
0.002
0.00 2.36
EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cult)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cult)
PEAK FLOW (cfs)
0.27 0.03
1187.67
0.03 1177.85
0.04 TH
2090
Plate E-2.2
PROJECT: WORLD MUSEUM EXIST 10 YR EVENT - SOUTH
JOB # C2026
1 BASIN CHARACTERISTICS
CONTOUR
DEPTH
INCR TOTAL
(ft) (ft)
AREA
INCR TOTAL
(sf) (sf)
VOLUME
INCR TOTAL
(cuft) (cuft) (acre -ft)
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 PERCOLATION CALCULATIONS
PERCOLATION RATE
MAXWELL IV DRYWELLS
NUMBER USED
RATE/DRYWELL
TOTAL DISSIPATED
TOTAL PERCOLATION RATE
0 in/hr
0 0 cfs
0.00 cfs
0 cfs
0.00 cfs
Basin Characteristics
2091
1 JOB # C2026
100 YEAR - 3 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)
TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
BALANCE IN
BASIN
(cuft) (acre -ft)
1 5
0.03 9
9 0
9 -
9 0.00
2 10
0.03 9
17 0
17 -
17 0.00
3 15
0.02 7
25 0
25 -
25 0.00
4 20
0.03 10
35 0
35 -
35 0.00
5 25
0.03 10
45 0
45 -
45 0.00
6 30
0.04 12
56 0
56 -
56 0.00
7 35
0.03 10
66 0
66 -
66 0.00
8 40
0.04 12
78 0
78 -
78 0.00
9 45
0.04 12
90 0
90 -
90 0.00
10 50
0.03 10
100
0 100
-
100
0.00 11
55 0.04
11 111
0 111
-
111
0.00 12
60 0.04
12 123
0 123
-
123
0.00 13
65 0.05
15 137
0 137
-
137
0.00 14
70 0.05
15 152
0 152
-
152
0.00 15
75 0.05
15 167
0 167
-
167
0.00 16
80 0.04
13 180
0 180
-
180
0.00 17
85 0.06
17 197
0 197
-
197
0.00 18
90 0.06
18 215
0 215
-
215
0.00 19
95 0.05
16 231
0 231
-
231
0.01 20
100
0.06 18
249
0 249
-
249
0.01 21
105
0.02 5
254
0 254
-
254
0.01 22
110
0.07 21
275
0 275
-
275
0.01 23
115
0.06 19
294
0 294
-
294
0.01 24
120
0.07 20
314
0 314
-
314
0.01 25
125
0.07 21
334
0 334
-
334
0.01 26
130
0.22 65
399
0 399
-
399
0.01 27
135
0.39 118
517
0 517
-
517
0.01 28
140
0.06 18
535
0 535
-
535
0.01 29
145
0.79 237
772
0 772
-
772
0.02 30
150
0.90 271
1,043
0 1,043
-
1,043
0.02 31
155
1.10 330
1,373
0 1,373
-
1,373
0.03 32
160
0.59 178
1,551
0 1,551
-
1,551
0.04 33
165
0.04 13
1,564
0 1,564
-
1,564
0.04 34
170
0.04 12
1,576
0 1,576
-
1,576
0.04 35
175
0.04 12
1,588
0 1,588
-
1,588
0.04 36
180
0.01 4
1,592
0 1,592
-
1,592
0.04 2092
Basin Depth Analysis
1 JOB # C2026
100 YEAR - 6 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
5 0.01
2 10
3 VOLUME
IN
(cuft)
0.02 5
15 0.02
4 20
5 25
6 30
7 35
5 0.02 5
0.02 5
0.02 6
0.02 6
8 40
9 45
10 50
11 55
0.02 6
0.02 6
0.02 6
0.02 6
12 60
0.02 7
13 65
0.02 7
14 70
0.02 7
15 75
0.02 7
16 80
0.02 7
17 85
0.02 7
18 90
0.02 7
19 95
0.02 7
20 100 0.02 7
21 105 0.02 7
22 110 0.02 7
23 115 0.02 7
24 120 0.03 8
25 125 0.02 7
26 130 0.03 8
27 135 0.03 8
28 140 0.03 8
29 145 0.03 8
30 150 0.03 8
31 155 0.03 8
32 160 0.03 8
33 165 0.03 9
34 170 0.03 9
35 175 0.03 9
36 180 0.03 9
37 185 0.03 9
38 190 0.03 9
39 195 0.03 9
40 200 0.03
41 205
42 210
43 215
TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)
TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
4 9
15 20
25 31
37 0
0 0
0 0
0 0
4 9
15 20
25 31
37 43
0 43
49 0
49 55
0 55
61 0
61 68
0 68
74 0 74
81 0 81
88 0 88
95 0 95
102
0 102
109
0 109
115
0 115
122
0 122
129
0 129
136
0 136
143
0 143
150
0 150
157
0 157
165
0 165
173
0 173
180
0 180
188
0 188
196
0 196
203
0 203
211
0 211
220
0 220
228
0 228
237
0 237
245
0 245
254
0 254
263
0 263
273
0 273
BALANCE IN
BASIN
(cuft) (acre -ft)
4 9
15 20
25 31
37 43
49 55
61 68
74 81
88 95
102
109
115
122
129
136
143
150
157
165
173
180
188
196
203
211
220
228
237
245
254
263
273
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.01 0.01
0.01 0.01
0.01 0.01
0.01 9 282 0 282 - 282 0.01
0.03 10 292 0 292 - 292 0.01
0.04 11 303 0 303 - 303 0.01
0.04 12 315 0 315 - 315 0.01
44 220 0.04 12
45 225 0.04 13
46 230 0.04 13
47 235 0.05 14
48 240 0.05 14
49 245 0.05 15
50 250 0.05 15
51 255 0.05 16
52 260 0.06 17
53 265 0.06 18
54 270 0.06 18
55 275 0.06 19
327
0 327
340
0 340
353
0 353
367
0 367
380
0 380
395
0 395
410
0 410
426
0 426
444
0 444
461
0 461
479
0 479
498
0 498
327
340
353
367
380
395
410
426
444
461
479
498
0.01 0.01
0.01 0.01
0.01 0.01
0.01 0.01
0.01 0.01
0.01 0.01
2093
Basin Depth Analysis
1 JOB # C2026
100 YEAR - 6 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)
TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
BALANCE IN
BASIN
(cuft) (acre -ft)
56 280
0.07 20
518
0 518
-
518
0.01 57
285
0.07 21
538
0 538
-
538
0.01 58
290
0.07 21
559
0 559
-
559
0.01 59
295
0.07 21
580
0 580
-
580
0.01 60
300
0.03 8
588
0 588
-
588
0.01 61
305
0.17 51
639
0 639
-
639
0.01 62
310
0.31 93
732
0 732
-
732
0.02 63
315
0.40 119
851
0 851
-
851
0.02 64
320
0.48 145
996
0 996
-
996
0.02 65
325
0.62 187
1,183
0 1,183
-
1,183
0.03 66
330
0.88 264
1,447
0 1,447
-
1,447
0.03 67
335
0.05 16
1,464
0 1,464
-
1,464
0.03 68
340
0.03 8
1,471
0 1,471
-
1,471
0.03 69
345
0.02 5
1,476
0 1,476
-
1,476
0.03 70
350
0.01 4
1,481
0 1,481
-
1,481
0.03 71
355
0.01 3
1,483
0 1,483
-
1,483
0.03 72
360
0.01 2
1,485
0 1,485
-
1,485
0.03 2094
Basin Depth Analysis
1 JOB # C2026
100 YEAR - 24 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
TOTAL IN
BASIN
(cuft)
PERC TOTAL IN
OUT BASIN
(cuft) (cuft)
BASIN
DEPTH
(ft)
BALANCE IN
BASIN
(cuft) (acre -ft)
1 15
0.00 2
2 0 2
2 0.00
2 30
0.00 4
6 0 6
6 0.00
3 45
0.00 4
9 0 9
9 0.00
4 60
0.01 5
14 0 14
14 0.00
5 75
0.00 4
18 0 18
18 0.00
6 90
0.00 4
21 0 21
21 0.00
7 105
0.00 4
25 0 25
25 0.00
8 120
0.01 5
29 0 29
29 0.00
9 135
0.01 5
34 0 34
34 0.00
10 150
0.01 5
39 0 39
39 0.00
11 165
0.01 6
45 0 45
45 0.00
12 180
0.01 6
51 0 51
51 0.00
13 195
0.01 6
57 0 57
57 0.00
14 210
0.01 6
62 0 62
62 0.00
15 225
0.01 6
68 0 68
68 0.00
16 240
0.01 7
75 0 75
75 0.00
17 255
0.01 7
82 0 82
82 0.00
18 270
0.01 8
91 0 91
91 0.00
19 285
0.01 8
99 0 99
99 0.00
20 300
0.01 9
108
0 108
108
0.00 21
315
0.01 7
115
0 115
115
0.00 22
330
0.01 8
124
0 124
124
0.00 23
345
0.01 9
133
0 133
133
0.00 24
360
0.01 9
143
0 143
143
0.00 25
375
0.01 11
153
0 153
153
0.00 26
390
0.01 11
164
0 164
164
0.00 27
405
0.01 12
175
0 175
175
0.00 28
420
0.01 12
187
0 187
187
0.00 29
435
0.01 12
199
0 199
199
0.00 30
450
0.01 13
212
0 212
212
0.00 31
465
0.02 14
226
0 226
226
0.01 32
480
0.02 15
241
0 241
241
0.01 33
495
0.02 18
259
0 259
259
0.01 34
510
0.02 18
277
0 277
277
0.01 35
525
0.02 19
296
0 296
296
0.01 36
540
0.02 20
316
0 316
316
0.01 37
555
0.02 22
338
0 338
338
0.01 38
570
0.03 24
362
0 362
362
0.01 39
585
0.03 25
386
0 386
386
0.01 40
600
0.03 26
412
0 412
412
0.01 41
615
0.02 18
430
0 430
430
0.01 42
630
0.02 18
448
0 448
448
0.01 43
645
0.03 24
471
0 471
471
0.01 44
660
0.03 24
495
0 495
495
0.01 45
675
0.02 22
517
0 517
517
0.01 46
690
0.02 22
539
0 539
539
0.01 47
705
0.02 20
559
0 559
559
0.01 48
720
0.02 21
581
0 581
581
0.01 49
735
0.03 29
610
0 610
610
0.01 50
750
0.03 31
641
0 641
641
0.01 51
765
0.04 33
674
0 674
674
0.02 52
780
0.04 34
708
0 708
708
0.02 53
795
0.04 40
748
0 748
748
0.02 54
810
0.04 40
788
0 788
788
0.02 55
825
0.03 27
815
0 815
815
0.02 56
840
0.03 27
842
0 842
842
0.02 57
855
0.04 32
874
0 874
874
0.02 58
870
0.03 31
905
0 905
905
0.02 2095
Basin Depth Analysis
1 JOB # C2026
100 YEAR - 24 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)
TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
BALANCE IN
BASIN
(cuft) (acre -ft)
59 885
0.03 31
935
0 935
-
935
0.02 60
900
0.03 29
965
0 965
-
965
0.02 61
915
0.03 28
993
0 993
-
993
0.02 62
930
0.03 27
1,020
0 1,020
-
1,020
0.02 63
945
0.02 22
1,042
0 1,042
-
1,042
0.02 64
960
0.02 22
1,065
0 1,065
-
1,065
0.02 65
975
0.01 5
1,069
0 1,069
-
1,069
0.02 66
990
0.01 5
1,074
0 1,074
-
1,074
0.02 67
1005
0.00 4
1,078
0 1,078
-
1,078
0.02 68
1020
0.00 4
1,081
0 1,081
-
1,081
0.02 69
1035
0.01 6
1,087
0 1,087
-
1,087
0.02 70
1050
0.01 6
1,093
0 1,093
-
1,093
0.03 71
1065
0.01 6
1,099
0 1,099
-
1,099
0.03 72
1080
0.01 5
1,104
0 1,104
-
1,104
0.03 73
1095
0.01 5
1,108
0 1,108
-
1,108
0.03 74
1110
0.01 5
1,113
0 1,113
-
1,113
0.03 75
1125
0.00 4
1,117
0 1,117
-
1,117
0.03 76
1140
0.00 2
1,119
0 1,119
-
1,119
0.03 77
1155
0.00 4
1,122
0 1,122
-
1,122
0.03 78
1170
0.01 5
1,127
0 1,127
-
1,127
0.03 79
1185
0.00 4
1,131
0 1,131
-
1,131
0.03 80
1200
0.00 2
1,133
0 1,133
-
1,133
0.03 81
1215
0.00 4
1,137
0 1,137
-
1,137
0.03 82
1230
0.00 4
1,140
0 1,140
-
1,140
0.03 83
1245
0.00 4
1,144
0 1,144
-
1,144
0.03 84
1260
0.00 2
1,146
0 1,146
-
1,146
0.03 85
1275
0.00 4
1,150
0 1,150
-
1,150
0.03 86
1290
0.00 2
1,152
0 1,152
-
1,152
0.03 87
1305
0.00 4
1,155
0 1,155
-
1,155
0.03 88
1320
0.00 2
1,158
0 1,158
-
1,158
0.03 89
1335
0.00 4
1,161
0 1,161
-
1,161
0.03 90
1350
0.00 2
1,164
0 1,164
-
1,164
0.03 91
1365
0.00 2
1,166
0 1,166
-
1,166
0.03 92
1380
0.00 2
1,168
0 1,168
-
1,168
0.03 93
1395
0.00 2
1,171
0 1,171
-
1,171
0.03 94
1410
0.00 2
1,173
0 1,173
-
1,173
0.03 95
1425
0.00 2
1,175
0 1,175
-
1,175
0.03 96
1440
0.00 2
1,178
0 1,178
-
1,178
0.03 2096
Basin Depth Analysis
A B C
D
1 RCFC&WCD SHORTCUT UNIT HYDROGRAPH METHOD
2 DATA INPUT SHEET
3 4
WORKSHEET PREPARED BY:
JAMES R. BAZUA, P.E.
5 6
PROJECT NAME
WORLD MUSEUM SOUTH PROP 2 YR EVENT
7 JOB #
C2026
8 9
CONCENTRATION POINT DESIGNATION
1 10
AREA DESIGNATION
ON -SITE
11 12
TRIBUTARY AREAS
ACRES
13 14
COMMERCIAL
15 PAVING/HARDSCAPE
0.37 16
SF - 1 ACRE
17 SF - 1/2 ACRE
18 SF-1/4ACRE
19 MF - CONDOMINIUMS
20 MF- APARTMENTS
21 MOBILE HOME PARK
22 LANDSCAPING
0.51 23
RETENTION BASIN
24 GOLF COURSE
25 MOUNTAINOUS
0.35 26
LOW LOSS RATE (PERCENT)
90%
27 28
LENGTH OF WATERCOURSE (L)
315
29 LENGTH TO POINT OPPOSITE CENTROID (Lca)
15 30
31 ELEVATION OF HEADWATER
329
32 ELEVATION OF CONCENTRATION POINT
267
33 34
AVERAGE MANNINGS 'N' VALUE
0.02 35
36 STORM FREQUENCY (YEAR)
100
37 38
POINT RAIN
39 3 -HOUR
0.721
40 6 -HOUR
0.953
41 24 -HOUR
1.36 42
43 BASIN CHARACTERISTICS:
ELEVATION
AREA
44 45
46 47
48 49
50 51
52 PERCOLATION RATE (in/hr)
53 54
DRYWELL DATA
55 NUMBER USED
56 PERCOLATION RATE (cfs)
2097
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: WORLD MUSEUM SOUTH PROP 2 YR EVENT BASIC DATA CALCULATION FORM JOB # C2026
SHORTCUT METHOD BY =S R. BAZUA, P.E. DATE 3/28/2025
PHYSICAL DATA
[1] CONCENTRATION POINT
1 [2] AREA DESIGNATION
ON -SITE
[3] AREA - ACRES
1.230
[4] L -FEET
315
[5] L -MILES
0.060
[6] La -FEET
15.00 [7] La -MILES
0.003
[8] ELEVATION OF HEADWATER
329
[9] ELEVATION OF CONCENTRATION POINT
267
[10] H -FEET
62 [11] S-FEET/MILE
1039.2
[12] S^0.5
32.24 [13] L*LCA/S^0.5
0.000
[14] AVERAGE MANNINGS 'N'
0.02 [15] LAG TIME -HOURS
0.00 [16] LAG TIME -MINUTES
0.3 [17] 100% OF LAG -MINUTES
0.3 [18] 200% OF LAG -MINUTES
0.6 [19] UNIT TIME -MINUTES (100%-200% OF LAG)
5 [24] TOTAL PERCOLATION RATE (cfs)
0.00 RAINFALL DATA
[1] SOURCE
[2] FREQUENCY -YEARS 100
[3] DURATION:
3 -HOURS
6 -HOURS
24 -HOURS
[4]
POINT
RAIN
INCHES
(Plate E-5.2)
[5]
AREA
[6]
[7]
AVERAGE
POINT
RAIN
INCHES
[8]
POINT
RAIN
INCHES
(Plate E-5.4)
[9]
AREA
[10]
[11]
AVERAGE
POINT
RAIN
INCHES
[12]
POINT
RAIN
INCHES
(Plate E-5.6)
[13]
AREA
[14]
[15]
AVERAGE
POINT
RAIN
INCHES
0.72 1.230
1.00 0.72
0.95 1.230
1.00 0.95
1.36 1.230
1.00 1.36
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
SUM [5]
[16] AREA ADJ
[17] ADJ AVG
1.23 SUM [7]
0.72 SUM [9]
1.23 SUM [11]
0.95 SUM [13]
1.23 SUM [15]
1.36 FACTOR
POINT RAIN
1.000
1.000
1.000
0.72 0.95
1.36 STORM EVENT SUMMARY
DURATION
3 -HOUR
6 -HOUR
24 -HOUR
EFFECTIVE RAIN
(in)
0.13 0.13
0.14 FLOOD VOLUME
(cu -ft)
(acre -ft)
576
0.01 560
0.01 607
0.01 REQUIRED STORAGE
(cu -ft)
(acre -ft)
571
0.01 556
0.01 602
0.01 PEAK FLOW
(cfs)
0.40 0.32
0.02 MAXIMUM WSEL
(ft)
-
-
-
2098
Plate E-2.1
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
PROJECT WORLD MUSEUM SOUTH PROP 2 YR EVENT
CONCENTRATION POINT: 1
BY MES R. BAZUA, P.E. DATE 3/28/2025
ADJUSTED LOSS RATE
SOIL
GROUP
[Plate C-1]
LAND USE
RI
NUMBER
[Plate E-6.1]
PERVIOUS
AREA
INFILTRATION
RATE
(in/hr)
[Plate E-6.2]
DECIMAL
PERCENT
OF AREA
IMPERVIOUS
[Plate E-6.3]
ADJUSTED
INFILTRATION
RATE
(in/hr)
AREA
AVERAGE
ADJUSTED
INFILTRATION
RATE
(in/hr)
A
COMMERCIAL
32 0.74
90%
0.14 0.00
0.000
0.0000
A
PAVING/HARDSCAPE
32 0.74
100%
0.07 0.37
0.301
0.0223
A
SF - 1 ACRE
32 0.74
20%
0.61 0.00
0.000
0.0000
A
SF - 1/2 ACRE
32 0.74
40%
0.47 0.00
0.000
0.0000
A
SF - 1/4 ACRE
32 0.74
50%
0.41 0.00
0.000
0.0000
A
MF - CONDOMINIUMS
32 0.74
65%
0.31 0.00
0.000
0.0000
A
MF - APARTMENTS
32 0.74
80%
0.21 0.00
0.000
0.0000
A
MOBILE HOME PARKS
32 0.74
75%
0.24 0.00
0.000
0.0000
A
LANDSCAPING
32 0.74
0%
0.74 0.51
0.415
0.3068
A
RETENTION BASINS
32 0.74
0%
0.74 0.00
0.000
0.0000
A
GOLF COURSE
32 0.74
0%
0.74 0.00
0.000
0.0000
D
MOUNTAINOUS
93 0.95
90%
0.18 0.35
0.285
0.0514
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
VARIABLE LOSS
Fm=
C=
Ft=C(24-(T/60))^1.55
LOW LOSS RATE
Where:
T=Time in minutes.
T=1 1/2 unit time for
RATE CURVE (24
-HOUR STORM ONLY)
=
value for each unit
etc.
0.00352
SUM
(24-(T/60))^1.55 + 0.19
= 90%
T=1/2 the unit time for the first time period,
1.23 SUM
0.3805
in/hr
0.19022561
0.00352
(80-90 PERCENT)
To get an average
the second period,
time period, Use
2099
Plate E-2.1
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 3 HOUR STORM EVENT
PROJECT: WORLD MUSEUM SOUTH PROP 2 YR EVENT
CONCENTRATION POINT: 1
BY: IES R. BAZUA, DATE 3/28/2025
EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.23
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.28
UNIT TIME -PERCENT OF LAG 1760.7
TOTAL ADJUSTED STORM RAIN -INCHES 0.72
CONSTANT LOSS RATE-in/hr 0.38
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 5
0.08 1.3
0.112
0.38 0.10
0.01 0.01
4.15 2
10 0.17
1.3 0.112
0.38 0.10
0.01 0.01
4.15 3
15 0.25
1.1 0.095
0.38 0.09
0.01 0.01
3.51 4
20 0.33
1.5 0.130
0.38 0.12
0.01 0.02
4.79 5
25 0.42
1.5 0.130
0.38 0.12
0.01 0.02
4.79 6
30 0.50
1.8 0.156
0.38 0.14
0.02 0.02
5.75 7
35 0.58
1.5 0.130
0.38 0.12
0.01 0.02
4.79 8
40 0.67
1.8 0.156
0.38 0.14
0.02 0.02
5.75 9
45 0.75
1.8 0.156
0.38 0.14
0.02 0.02
5.75 10
50 0.83
1.5 0.130
0.38 0.12
0.01 0.02
4.79 11
55 0.92
1.6 0.138
0.38 0.12
0.01 0.02
5.11 12
60 1.00
1.8 0.156
0.38 0.14
0.02 0.02
5.75 13
65 1.08
2.2 0.190
0.38 0.17
0.02 0.02
7.02 14
70 1.17
2.2 0.190
0.38 0.17
0.02 0.02
7.02 15
75 1.25
2.2 0.190
0.38 0.17
0.02 0.02
7.02 16
80 1.33
2.0 0.173
0.38 0.16
0.02 0.02
6.39 17
85 1.42
2.6 0.225
0.38 0.20
0.02 0.03
8.30 18
90 1.50
2.7 0.234
0.38 0.21
0.02 0.03
8.62 19
95 1.58
2.4 0.208
0.38 0.19
0.02 0.03
7.66 20
100
1.67 2.7
0.234
0.38 0.21
0.02 0.03
8.62 21
105
1.75 3.3
0.286
0.38 0.26
0.03 0.04
10.54 22
110
1.83 3.1
0.268
0.38 0.24
0.03 0.03
9.90 23
115
1.92 2.9
0.251
0.38 0.23
0.03 0.03
9.26 24
120
2.00 3.0
0.260
0.38 0.23
0.03 0.03
9.58 25
125
2.08 3.1
0.268
0.38 0.24
0.03 0.03
9.90 26
130
2.17 4.2
0.363
0.38 0.33
0.04 0.04
13.41 27
135
2.25 5.0
0.433
0.38 0.39
0.05 0.06
19.24 28
140
2.33 3.5
0.303
0.38 0.27
0.03 0.04
11.17 29
145
2.42 6.8
0.588
0.38 0.53
0.21 0.26
76.71 30
150
2.50 7.3
0.632
0.38 0.57
0.25 0.31
92.67 31
155
2.58 8.2
0.709
0.38 0.64
0.33 0.40
121.41
32 160
2.67 5.9
0.510
0.38 0.46
0.13 0.16
47.98 33
165
2.75 2.0
0.173
0.38 0.16
0.02 0.02
6.39 34
170
2.83 1.8
0.156
0.38 0.14
0.02 0.02
5.75 35
175
2.92 1.8
0.156
0.38 0.14
0.02 0.02
5.75 36
180
3.00 0.6
0.052
0.38 0.05
0.01 0.01
1.92 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cuft)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cuft)
PEAK FLOW RATE (cfs)
0.13 0.01
576.03
0.01 571.27
0.40 2100
Plate E-2.2
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 6 HOUR STORM EVENT
PROJECT: WORLD MUSEUM SOUTH PROP 2 YR EVEN -
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025
EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.23
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.28
UNIT TIME -PERCENT OF LAG 1760.7
TOTAL ADJUSTED STORM RAIN -INCHES 0.95
CONSTANT LOSS RATE-in/hr 0.380
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 5
0.08 0.5
0.057
0.38 0.05
0.01 0.01
2.11 2
10 0.17
0.6 0.069
0.38 0.06
0.01 0.01
2.53 3
15 0.25
0.6 0.069
0.38 0.06
0.01 0.01
2.53 4
20 0.33
0.6 0.069
0.38 0.06
0.01 0.01
2.53 5
25 0.42
0.6 0.069
0.38 0.06
0.01 0.01
2.53 6
30 0.50
0.7 0.080
0.38 0.07
0.01 0.01
2.95 7
35 0.58
0.7 0.080
0.38 0.07
0.01 0.01
2.95 8
40 0.67
0.7 0.080
0.38 0.07
0.01 0.01
2.95 9
45 0.75
0.7 0.080
0.38 0.07
0.01 0.01
2.95 10
50 0.83
0.7 0.080
0.38 0.07
0.01 0.01
2.95 11
55 0.92
0.7 0.080
0.38 0.07
0.01 0.01
2.95 12
60 1.00
0.8 0.091
0.38 0.08
0.01 0.01
3.38 13
65 1.08
0.8 0.091
0.38 0.08
0.01 0.01
3.38 14
70 1.17
0.8 0.091
0.38 0.08
0.01 0.01
3.38 15
75 1.25
0.8 0.091
0.38 0.08
0.01 0.01
3.38 16
80 1.33
0.8 0.091
0.38 0.08
0.01 0.01
3.38 17
85 1.42
0.8 0.091
0.38 0.08
0.01 0.01
3.38 18
90 1.50
0.8 0.091
0.38 0.08
0.01 0.01
3.38 19
95 1.58
0.8 0.091
0.38 0.08
0.01 0.01
3.38 20
100
1.67 0.8
0.091
0.38 0.08
0.01 0.01
3.38 21
105
1.75 0.8
0.091
0.38 0.08
0.01 0.01
3.38 22
110
1.83 0.8
0.091
0.38 0.08
0.01 0.01
3.38 23
115
1.92 0.8
0.091
0.38 0.08
0.01 0.01
3.38 24
120
2.00 0.9
0.103
0.38 0.09
0.01 0.01
3.80 25
125
2.08 0.8
0.091
0.38 0.08
0.01 0.01
3.38 26
130
2.17 0.9
0.103
0.38 0.09
0.01 0.01
3.80 27
135
2.25 0.9
0.103
0.38 0.09
0.01 0.01
3.80 28
140
2.33 0.9
0.103
0.38 0.09
0.01 0.01
3.80 29
145
2.42 0.9
0.103
0.38 0.09
0.01 0.01
3.80 30
150
2.50 0.9
0.103
0.38 0.09
0.01 0.01
3.80 31
155
2.58 0.9
0.103
0.38 0.09
0.01 0.01
3.80 32
160
2.67 0.9
0.103
0.38 0.09
0.01 0.01
3.80 33
165
2.75 1.0
0.114
0.38 0.10
0.01 0.01
4.22 34
170
2.83 1.0
0.114
0.38 0.10
0.01 0.01
4.22 35
175
2.92 1.0
0.114
0.38 0.10
0.01 0.01
4.22 36
180
3.00 1.0
0.114
0.38 0.10
0.01 0.01
4.22 37
185
3.08 1.0
0.114
0.38 0.10
0.01 0.01
4.22 38
190
3.17 1.1
0.126
0.38 0.11
0.01 0.02
4.64 39
195
3.25 1.1
0.126
0.38 0.11
0.01 0.02
4.64 40
200
3.33 1.1
0.126
0.38 0.11
0.01 0.02
4.64 41
205
3.42 1.2
0.137
0.38 0.12
0.01 0.02
5.06 42
210
3.50 1.3
0.149
0.38 0.13
0.01 0.02
5.49 43
215
3.58 1.4
0.160
0.38 0.14
0.02 0.02
5.91 44
220
3.67 1.4
0.160
0.38 0.14
0.02 0.02
5.91 45
225
3.75 1.5
0.172
0.38 0.15
0.02 0.02
6.33 46
230
3.83 1.5
0.172
0.38 0.15
0.02 0.02
6.33 47
235
3.92 1.6
0.183
0.38 0.16
0.02 0.02
6.75 48
240
4.00 1.6
0.183
0.38 0.16
0.02 0.02
6.75 49
245
4.08 1.7
0.194
0.38 0.17
0.02 0.02
7.17 50
250
4.17 1.8
0.206
0.38 0.19
0.02 0.03
7.60 51
255
4.25 1.9
0.217
0.38 0.20
0.02 0.03
8.02 52
260
4.33 2.0
0.229
0.38 0.21
0.02 0.03
8.44 53
265
4.42 2.1
0.240
0.38 0.22
0.02 0.03
8.86 54
270
4.50 2.1
0.240
0.38 0.22
0.02 0.03
8.86 55
275
4.58 2.2
0.252
0.38 0.23
0.03 0.03
9.28 56
280
4.67 2.3
0.263
0.38 0.24
0.03 0.03
9.71 2101
Plate E-2.2
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 6 HOUR STORM EVENT
PROJECT: WORLD MUSEUM SOUTH PROP 2 YR EVEN -
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025
EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.23
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.28
UNIT TIME -PERCENT OF LAG 1760.7
TOTAL ADJUSTED STORM RAIN -INCHES 0.95
CONSTANT LOSS RATE-in/hr 0.380
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
57 285
4.75 2.4
0.274
0.38 0.25
0.03 0.03
10.13 58
290
4.83 2.4
0.274
0.38 0.25
0.03 0.03
10.13 59
295
4.92 2.5
0.286
0.38 0.26
0.03 0.04
10.55 60
300
5.00 2.6
0.297
0.38 0.27
0.03 0.04
10.97 61
305
5.08 3.1
0.355
0.38 0.32
0.04 0.04
13.08 62
310
5.17 3.6
0.412
0.38 0.37
0.03 0.04
11.53 63
315
5.25 3.9
0.446
0.38 0.40
0.07 0.08
24.19 64
320
5.33 4.2
0.480
0.38 0.43
0.10 0.12
36.85 65
325
5.42 4.7
0.537
0.38 0.48
0.16 0.19
57.95 66
330
5.50 5.6
0.640
0.38 0.58
0.26 0.32
95.93 67
335
5.58 1.9
0.217
0.38 0.20
0.02 0.03
8.02 68
340
5.67 0.9
0.103
0.38 0.09
0.01 0.01
3.80 69
345
5.75 0.6
0.069
0.38 0.06
0.01 0.01
2.53 70
350
5.83 0.5
0.057
0.38 0.05
0.01 0.01
2.11 71
355
5.92 0.3
0.034
0.38 0.03
0.00 0.00
1.27 72
360
6.00 0.2
0.023
0.38 0.02
0.00 0.00
0.84 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cuft)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cuft)
PEAK FLOW RATE (cfs)
0.13 0.01
560.23
0.01 555.59
0.32 2102
Plate E-2.2
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 24 HOUR STORM EVENT
PROJECT: WORLD MUSEUM SOUTH PROP 2 YR EVEN
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025
EFFECTIVE
RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.230
UNIT TIME -MINUTES 15
LAG TIME - MINUTES 0.28
UNIT TIME -PERCENT OF LAG 5282.1
TOTAL ADJUSTED STORM RAIN -INCHES 1.36
CONSTANT LOSS RATE-in/hr n/a
VARIABLE LOSS RATE (AVG) in/hr 0.3805
MINIMUM LOSS RATE (for var. loss) - in/hr 0.190
LOW LOSS RATE - DECIMAL 0.90
C 0.00352
PERCOLATION RATE (cfs) 0.00
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 15
0.25 0.2
0.011
0.672
0.010
0.001
0.00 1.20
2 30
0.50 0.3
0.016
0.664
0.015
0.002
0.00 1.81
3 45
0.75 0.3
0.016
0.656
0.015
0.002
0.00 1.81
4 60
1.00 0.4
0.022
0.649
0.020
0.002
0.00 2.41
5 75
1.25 0.3
0.016
0.641
0.015
0.002
0.00 1.81
6 90
1.50 0.3
0.016
0.633
0.015
0.002
0.00 1.81
7 105
1.75 0.3
0.016
0.626
0.015
0.002
0.00 1.81
8 120
2.00 0.4
0.022
0.618
0.020
0.002
0.00 2.41
9 135
2.25 0.4
0.022
0.611
0.020
0.002
0.00 2.41
10 150
2.50 0.4
0.022
0.603
0.020
0.002
0.00 2.41
11 165
2.75 0.5
0.027
0.596
0.024
0.003
0.00 3.01
12 180
3.00 0.5
0.027
0.589
0.024
0.003
0.00 3.01
13 195
3.25 0.5
0.027
0.581
0.024
0.003
0.00 3.01
14 210
3.50 0.5
0.027
0.574
0.024
0.003
0.00 3.01
15 225
3.75 0.5
0.027
0.567
0.024
0.003
0.00 3.01
16 240
4.00 0.6
0.033
0.560
0.029
0.003
0.00 3.61
17 255
4.25 0.6
0.033
0.553
0.029
0.003
0.00 3.61
18 270
4.50 0.7
0.038
0.546
0.034
0.004
0.00 4.22
19 285
4.75 0.7
0.038
0.539
0.034
0.004
0.00 4.22
20 300
5.00 0.8
0.044
0.532
0.039
0.004
0.01 4.82
21 315
5.25 0.6
0.033
0.525
0.029
0.003
0.00 3.61
22 330
5.50 0.7
0.038
0.518
0.034
0.004
0.00 4.22
23 345
5.75 0.8
0.044
0.511
0.039
0.004
0.01 4.82
24 360
6.00 0.8
0.044
0.504
0.039
0.004
0.01 4.82
25 375
6.25 0.9
0.049
0.498
0.044
0.005
0.01 5.42
26 390
6.50 0.9
0.049
0.491
0.044
0.005
0.01 5.42
27 405
6.75 1.0
0.054
0.485
0.049
0.005
0.01 6.02
28 420
7.00 1.0
0.054
0.478
0.049
0.005
0.01 6.02
29 435
7.25 1.0
0.054
0.471
0.049
0.005
0.01 6.02
30 450
7.50 1.1
0.060
0.465
0.054
0.006
0.01 6.62
31 465
7.75 1.2
0.065
0.459
0.059
0.007
0.01 7.23
32 480
8.00 1.3
0.071
0.452
0.064
0.007
0.01 7.83
33 495
8.25 1.5
0.082
0.446
0.073
0.008
0.01 9.03
34 510
8.50 1.5
0.082
0.440
0.073
0.008
0.01 9.03
35 525
8.75 1.6
0.087
0.434
0.078
0.009
0.01 9.64
36 540
9.00 1.7
0.092
0.428
0.083
0.009
0.01 10.24
37 555
9.25 1.9
0.103
0.422
0.093
0.010
0.01 11.44
38 570
9.50 2.0
0.109
0.416
0.098
0.011
0.01 12.04
39 585
9.75 2.1
0.114
0.410
0.103
0.011
0.01 12.65
40 600
10.00 2.2
0.120
0.404
0.108
0.012
0.01 13.25
41 615
10.25 1.5
0.082
0.398
0.073
0.008
0.01 9.03
42 630
10.50 1.5
0.082
0.392
0.073
0.008
0.01 9.03
43 645
10.75 2.0
0.109
0.386
0.098
0.011
0.01 12.04
44 660
11.00 2.0
0.109
0.381
0.098
0.011
0.01 12.04
45 675
11.25 1.9
0.103
0.375
0.093
0.010
0.01 11.44
46 690
11.50 1.9
0.103
0.370
0.093
0.010
0.01 11.44
47 705
11.75 1.7
0.092
0.364
0.083
0.009
0.01 10.24
48 720
12.00 1.8
0.098
0.359
0.088
0.010
0.01 10.84
49 735
12.25 2.5
0.136
0.353
0.122
0.014
0.02 15.06
50 750
12.50 2.6
0.141
0.348
0.127
0.014
0.02 15.66
51 765
12.75 2.8
0.152
0.343
0.137
0.015
0.02 16.86
52 780
13.00 2.9
0.158
0.338
0.142
0.016
0.02 17.46
53 795
13.25 3.4
0.185
0.333
0.166
0.018
0.02 20.48
54 810
13.50 3.4
0.185
0.328
0.166
0.018
0.02 20.48
55 825
13.75 2.3
0.125
0.323
0.113
0.013
0.02 13.85
56 840
14.00 2.3
0.125
0.318
0.113
0.013
0.02 13.85
57 855
14.25 2.7
0.147
0.313
0.132
0.015
0.02 16.26
58 870
14.50 2.6
0.141
0.308
0.127
0.014
0.02 15.66
59 885
14.75 2.6
0.141
0.303
0.127
0.014
0.02 15.66
60 900
15.00 2.5
0.136
0.299
0.122
0.014
0.02 15.06
61 915
15.25 2.4
0.131
0.294
0.118
0.013
0.02 14.45
62 930
15.50 2.3
0.125
0.290
0.113
0.013
0.02 13.85
63 945
15.75 1.9
0.103
0.285
0.093
0.010
0.01 11.44
64 960
16.00 1.9
0.103
0.281
0.093
0.010
0.01 11.44
65 975
16.25 0.4
0.022
0.277
0.020
0.002
0.00 2.41
66 990
16.50 0.4
0.022
0.272
0.020
0.002
0.00 2.41
67 1005
16.75 0.3
0.016
0.268
0.015
0.002
0.00 1.81
2103
Plate E-2.2
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 24 HOUR STORM EVENT
PROJECT: WORLD MUSEUM SOUTH PROP 2 YR EVEN
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025
EFFECTIVE
RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.230
UNIT TIME -MINUTES 15
LAG TIME - MINUTES 0.28
UNIT TIME -PERCENT OF LAG 5282.1
TOTAL ADJUSTED STORM RAIN -INCHES 1.36
CONSTANT LOSS RATE-in/hr n/a
VARIABLE LOSS RATE (AVG) in/hr 0.3805
MINIMUM LOSS RATE (for var. loss) - in/hr 0.190
LOW LOSS RATE - DECIMAL 0.90
C 0.00352
PERCOLATION RATE (cfs) 0.00
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
68 1020
17.00 0.3
0.016
0.264
0.015
0.002
0.00 1.81
69 1035
17.25 0.5
0.027
0.260
0.024
0.003
0.00 3.01
70 1050
17.50 0.5
0.027
0.256
0.024
0.003
0.00 3.01
71 1065
17.75 0.5
0.027
0.252
0.024
0.003
0.00 3.01
72 1080
18.00 0.4
0.022
0.249
0.020
0.002
0.00 2.41
73 1095
18.25 0.4
0.022
0.245
0.020
0.002
0.00 2.41
74 1110
18.50 0.4
0.022
0.241
0.020
0.002
0.00 2.41
75 1125
18.75 0.3
0.016
0.238
0.015
0.002
0.00 1.81
76 1140
19.00 0.2
0.011
0.235
0.010
0.001
0.00 1.20
77 1155
19.25 0.3
0.016
0.231
0.015
0.002
0.00 1.81
78 1170
19.50 0.4
0.022
0.228
0.020
0.002
0.00 2.41
79 1185
19.75 0.3
0.016
0.225
0.015
0.002
0.00 1.81
80 1200
20.00 0.2
0.011
0.222
0.010
0.001
0.00 1.20
81 1215
20.25 0.3
0.016
0.219
0.015
0.002
0.00 1.81
82 1230
20.50 0.3
0.016
0.216
0.015
0.002
0.00 1.81
83 1245
20.75 0.3
0.016
0.213
0.015
0.002
0.00 1.81
84 1260
21.00 0.2
0.011
0.211
0.010
0.001
0.00 1.20
85 1275
21.25 0.3
0.016
0.208
0.015
0.002
0.00 1.81
86 1290
21.50 0.2
0.011
0.206
0.010
0.001
0.00 1.20
87 1305
21.75 0.3
0.016
0.204
0.015
0.002
0.00 1.81
88 1320
22.00 0.2
0.011
0.202
0.010
0.001
0.00 1.20
89 1335
22.25 0.3
0.016
0.200
0.015
0.002
0.00 1.81
90 1350
22.50 0.2
0.011
0.198
0.010
0.001
0.00 1.20
91 1365
22.75 0.2
0.011
0.196
0.010
0.001
0.00 1.20
92 1380
23.00 0.2
0.011
0.194
0.010
0.001
0.00 1.20
93 1395
23.25 0.2
0.011
0.193
0.010
0.001
0.00 1.20
94 1410
23.50 0.2
0.011
0.192
0.010
0.001
0.00 1.20
95 1425
23.75 0.2
0.011
0.191
0.010
0.001
0.00 1.20
96 1440
24.00 0.2
0.011
0.190
0.010
0.001
0.00 1.20
EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cult)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cult)
PEAK FLOW (cfs)
0.14 0.01
607.23
0.01 602.21
0.02 2104
Plate E-2.2
PROJECT: WORLD MUSEUM SOUTH PROP 2 YR EVENT
JOB # C2026
1 BASIN CHARACTERISTICS
CONTOUR
DEPTH
INCR TOTAL
(ft) (ft)
AREA
INCR TOTAL
(sf) (sf)
VOLUME
INCR TOTAL
(cuft) (cuft) (acre -ft)
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 PERCOLATION CALCULATIONS
PERCOLATION RATE
MAXWELL IV DRYWELLS
NUMBER USED
RATE/DRYWELL
TOTAL DISSIPATED
TOTAL PERCOLATION RATE
0 in/hr
0 0 cfs
0.00 cfs
0 cfs
0.00 cfs
Basin Characteristics
2105
1 JOB # C2026
100 YEAR - 3 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)
TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
BALANCE IN
BASIN
(cuft) (acre -ft)
1 5
0.01 4
4 0
4 -
4 0.00
2 10
0.01 4
8 0
8 -
8 0.00
3 15
0.01 4
12 0
12 -
12 0.00
4 20
0.02 5
17 0
17 -
17 0.00
5 25
0.02 5
21 0
21 -
21 0.00
6 30
0.02 6
27 0
27 -
27 0.00
7 35
0.02 5
32 0
32 -
32 0.00
8 40
0.02 6
38 0
38 -
38 0.00
9 45
0.02 6
43 0
43 -
43 0.00
10 50
0.02 5
48 0
48 -
48 0.00
11 55
0.02 5
53 0
53 -
53 0.00
12 60
0.02 6
59 0
59 -
59 0.00
13 65
0.02 7
66 0
66 -
66 0.00
14 70
0.02 7
73 0
73 -
73 0.00
15 75
0.02 7
80 0
80 -
80 0.00
16 80
0.02 6
87 0
87 -
87 0.00
17 85
0.03 8
95 0
95 -
95 0.00
18 90
0.03 9
103
0 103
-
103
0.00 19
95 0.03
8 111
0 111
-
111
0.00 20
100
0.03 9
120
0 120
-
120
0.00 21
105
0.04 11
130
0 130
-
130
0.00 22
110
0.03 10
140
0 140
-
140
0.00 23
115
0.03 9
149
0 149
-
149
0.00 24
120
0.03 10
159
0 159
-
159
0.00 25
125
0.03 10
169
0 169
-
169
0.00 26
130
0.04 13
182
0 182
-
182
0.00 27
135
0.06 19
202
0 202
-
202
0.00 28
140
0.04 11
213
0 213
-
213
0.00 29
145
0.26 77
289
0 289
-
289
0.01 30
150
0.31 93
382
0 382
-
382
0.01 31
155
0.40 121
504
0 504
-
504
0.01 32
160
0.16 48
551
0 551
-
551
0.01 33
165
0.02 6
558
0 558
-
558
0.01 34
170
0.02 6
564
0 564
-
564
0.01 35
175
0.02 6
569
0 569
-
569
0.01 36
180
0.01 2
571
0 571
-
571
0.01 2106
Basin Depth Analysis
1 JOB # C2026
100 YEAR - 6 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
5 2 10
3 15
4 20
5 25
6 30
7 35
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
0.01 2
0.01 3
0.01 3
0.01 3
0.01 3
0.01 3
0.01 3
8 40
9 45
10 50
11 55
0.01 3
0.01 3
0.01 3
0.01 3
12 60
13 65
14 70
15 75
16 80
17 85
18 90
19 95
0.01 3
0.01 3
0.01 3
0.01 3
0.01 3
0.01 3
0.01 3
0.01 3
20 100 0.01 3
21 105 0.01 3
22 110 0.01 3
23 115 0.01 3
24 120 0.01 4
25 125 0.01 3
26 130 0.01 4
27 135 0.01 4
28 140 0.01 4
29 145 0.01 4
30 150 0.01 4
31 155 0.01 4
32 160 0.01 4
33 165 0.01 4
34 170 0.01 4
35 175 0.01 4
36 180 0.01 4
37 185 0.01 4
38 190 0.02 5
39 195 0.02 5
40 200 0.02
41 205 0.02
42 210 0.02
43 215 0.02
TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)
TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
2 5
7 10
12 15
18 0
0 0
0 0
0 0
2 5
7 10
12 15
18 21
0 21
24 0
24 27
0 27
30 0
30 33
37 40
43 47
50 54
57 60
64 67
70 0 33
0 37
0 40
0 43
0 47
0 50
0 54
0 57
0 60
0 64
0 67
0 70
74 0
74 78
0 78
81 0
81 85
0 85
89 0
89 93
0 93
97 0
97 100
0 100
104
0 104
108
0 108
113
0 113
117
0 117
121
0 121
125
0 125
130
0 130
135
0 135
BALANCE IN
BASIN
(cuft) (acre -ft)
2 5
7 10
12 15
18 21
24 27
30 33
37 40
43 47
50 54
57 60
64 67
70 74
78 81
85 89
93 97
100
104
108
113
117
121
125
130
135
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 5 139 0 139 - 139 0.00
5 144 0 144 - 144 0.00
5 150 0 150 - 150 0.00
6 156 0 156 - 156 0.00
44 220 0.02 6
45 225 0.02 6
46 230 0.02 6
47 235 0.02 7
48 240 0.02 7
49 245 0.02 7
50 250 0.03 8
51 255 0.03 8
52 260 0.03 8
53 265 0.03 9
54 270 0.03 9
55 275 0.03 9
162
0 162
168
0 168
174
0 174
181
0 181
188
0 188
195
0 195
203
0 203
211
0 211
219
0 219
228
0 228
237
0 237
246
0 246
162
168
174
181
188
195
203
211
219
228
237
246
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.01 0.01
0.01 0.01
2107
Basin Depth Analysis
1 JOB # C2026
100 YEAR - 6 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)
TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
BALANCE IN
BASIN
(cuft) (acre -ft)
56 280
0.03 10
256
0 256
-
256
0.01 57
285
0.03 10
266
0 266
-
266
0.01 58
290
0.03 10
276
0 276
-
276
0.01 59
295
0.04 11
287
0 287
-
287
0.01 60
300
0.04 11
298
0 298
-
298
0.01 61
305
0.04 13
311
0 311
-
311
0.01 62
310
0.04 12
322
0 322
-
322
0.01 63
315
0.08 24
346
0 346
-
346
0.01 64
320
0.12 37
383
0 383
-
383
0.01 65
325
0.19 58
441
0 441
-
441
0.01 66
330
0.32 96
537
0 537
-
537
0.01 67
335
0.03 8
545
0 545
-
545
0.01 68
340
0.01 4
549
0 549
-
549
0.01 69
345
0.01 3
551
0 551
-
551
0.01 70
350
0.01 2
553
0 553
-
553
0.01 71
355
0.00 1
555
0 555
-
555
0.01 72
360
0.00 1
556
0 556
-
556
0.01 2108
Basin Depth Analysis
1 JOB # C2026
100 YEAR - 24 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
TOTAL IN
BASIN
(cuft)
PERC TOTAL IN
OUT BASIN
(cuft) (cuft)
BASIN
DEPTH
(ft)
BALANCE IN
BASIN
(cuft) (acre -ft)
1 15
0.00 1
1 0 1
1 0.00
2 30
0.00 2
3 0 3
3 0.00
3 45
0.00 2
5 0 5
5 0.00
4 60
0.00 2
7 0 7
7 0.00
5 75
0.00 2
9 0 9
9 0.00
6 90
0.00 2
11 0 11
11 0.00
7 105
0.00 2
13 0 13
13 0.00
8 120
0.00 2
15 0 15
15 0.00
9 135
0.00 2
17 0 17
17 0.00
10 150
0.00 2
20 0 20
20 0.00
11 165
0.00 3
23 0 23
23 0.00
12 180
0.00 3
26 0 26
26 0.00
13 195
0.00 3
29 0 29
29 0.00
14 210
0.00 3
32 0 32
32 0.00
15 225
0.00 3
35 0 35
35 0.00
16 240
0.00 4
39 0 39
39 0.00
17 255
0.00 4
42 0 42
42 0.00
18 270
0.00 4
46 0 46
46 0.00
19 285
0.00 4
51 0 51
51 0.00
20 300
0.01 5
55 0 55
55 0.00
21 315
0.00 4
59 0 59
59 0.00
22 330
0.00 4
63 0 63
63 0.00
23 345
0.01 5
68 0 68
68 0.00
24 360
0.01 5
73 0 73
73 0.00
25 375
0.01 5
78 0 78
78 0.00
26 390
0.01 5
84 0 84
84 0.00
27 405
0.01 6
90 0 90
90 0.00
28 420
0.01 6
96 0 96
96 0.00
29 435
0.01 6
102
0 102
102
0.00 30
450
0.01 7
108
0 108
108
0.00 31
465
0.01 7
116
0 116
116
0.00 32
480
0.01 8
123
0 123
123
0.00 33
495
0.01 9
132
0 132
132
0.00 34
510
0.01 9
142
0 142
142
0.00 35
525
0.01 10
151
0 151
151
0.00 36
540
0.01 10
161
0 161
161
0.00 37
555
0.01 11
173
0 173
173
0.00 38
570
0.01 12
185
0 185
185
0.00 39
585
0.01 13
198
0 198
198
0.00 40
600
0.01 13
211
0 211
211
0.00 41
615
0.01 9
220
0 220
220
0.01 42
630
0.01 9
229
0 229
229
0.01 43
645
0.01 12
241
0 241
241
0.01 44
660
0.01 12
253
0 253
253
0.01 45
675
0.01 11
264
0 264
264
0.01 46
690
0.01 11
276
0 276
276
0.01 47
705
0.01 10
286
0 286
286
0.01 48
720
0.01 11
297
0 297
297
0.01 49
735
0.02 15
312
0 312
312
0.01 50
750
0.02 16
328
0 328
328
0.01 51
765
0.02 17
344
0 344
344
0.01 52
780
0.02 17
362
0 362
362
0.01 53
795
0.02 20
382
0 382
382
0.01 54
810
0.02 20
403
0 403
403
0.01 55
825
0.02 14
417
0 417
417
0.01 56
840
0.02 14
431
0 431
431
0.01 57
855
0.02 16
447
0 447
447
0.01 58
870
0.02 16
462
0 462
462
0.01 2109
Basin Depth Analysis
1 JOB # C2026
100 YEAR - 24 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)
TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
BALANCE IN
BASIN
(cuft) (acre -ft)
59 885
0.02 16
478
0 478
-
478
0.01 60
900
0.02 15
493
0 493
-
493
0.01 61
915
0.02 14
508
0 508
-
508
0.01 62
930
0.02 14
522
0 522
-
522
0.01 63
945
0.01 11
533
0 533
-
533
0.01 64
960
0.01 11
544
0 544
-
544
0.01 65
975
0.00 2
547
0 547
-
547
0.01 66
990
0.00 2
549
0 549
-
549
0.01 67
1005
0.00 2
551
0 551
-
551
0.01 68
1020
0.00 2
553
0 553
-
553
0.01 69
1035
0.00 3
556
0 556
-
556
0.01 70
1050
0.00 3
559
0 559
-
559
0.01 71
1065
0.00 3
562
0 562
-
562
0.01 72
1080
0.00 2
564
0 564
-
564
0.01 73
1095
0.00 2
567
0 567
-
567
0.01 74
1110
0.00 2
569
0 569
-
569
0.01 75
1125
0.00 2
571
0 571
-
571
0.01 76
1140
0.00 1
572
0 572
-
572
0.01 77
1155
0.00 2
574
0 574
-
574
0.01 78
1170
0.00 2
576
0 576
-
576
0.01 79
1185
0.00 2
578
0 578
-
578
0.01 80
1200
0.00 1
579
0 579
-
579
0.01 81
1215
0.00 2
581
0 581
-
581
0.01 82
1230
0.00 2
583
0 583
-
583
0.01 83
1245
0.00 2
585
0 585
-
585
0.01 84
1260
0.00 1
586
0 586
-
586
0.01 85
1275
0.00 2
588
0 588
-
588
0.01 86
1290
0.00 1
589
0 589
-
589
0.01 87
1305
0.00 2
591
0 591
-
591
0.01 88
1320
0.00 1
592
0 592
-
592
0.01 89
1335
0.00 2
594
0 594
-
594
0.01 90
1350
0.00 1
595
0 595
-
595
0.01 91
1365
0.00 1
596
0 596
-
596
0.01 92
1380
0.00 1
597
0 597
-
597
0.01 93
1395
0.00 1
599
0 599
-
599
0.01 94
1410
0.00 1
600
0 600
-
600
0.01 95
1425
0.00 1
601
0 601
-
601
0.01 96
1440
0.00 1
602
0 602
-
602
0.01 2110
Basin Depth Analysis
A B C
D
1 RCFC&WCD SHORTCUT UNIT HYDROGRAPH METHOD
2 DATA INPUT SHEET
3 4
WORKSHEET PREPARED BY:
JAMES R. BAZUA, P.E.
5 6
PROJECT NAME
WORLD MUSEUM SOUTH PROP 10 YR EVENT
7 JOB #
C2026
8 9
CONCENTRATION POINT DESIGNATION
1 10
AREA DESIGNATION
ON -SITE
11 12
TRIBUTARY AREAS
ACRES
13 14
COMMERCIAL
15 PAVING/HARDSCAPE
0.37 16
SF - 1 ACRE
17 SF - 1/2 ACRE
18 SF-1/4ACRE
19 MF - CONDOMINIUMS
20 MF- APARTMENTS
21 MOBILE HOME PARK
22 LANDSCAPING
0.51 23
RETENTION BASIN
24 GOLF COURSE
25 MOUNTAINOUS
0.35 26
LOW LOSS RATE (PERCENT)
90%
27 28
LENGTH OF WATERCOURSE (L)
315
29 LENGTH TO POINT OPPOSITE CENTROID (Lca)
15 30
31 ELEVATION OF HEADWATER
329
32 ELEVATION OF CONCENTRATION POINT
267
33 34
AVERAGE MANNINGS 'N' VALUE
0.02 35
36 STORM FREQUENCY (YEAR)
100
37 38
POINT RAIN
39 3 -HOUR
1.5 40
6 -HOUR
1.93 41
24 -HOUR
2.66 42
43 BASIN CHARACTERISTICS:
ELEVATION
AREA
44 45
46 47
48 49
50 51
52 PERCOLATION RATE (in/hr)
53 54
DRYWELL DATA
55 NUMBER USED
56 PERCOLATION RATE (cfs)
2111
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: WORLD MUSEUM SOUTH PROP 10 YR EVENT BASIC DATA CALCULATION FORM JOB # C2026
SHORTCUT METHOD BY =S R. BAZUA, P.E. DATE 3/28/2025
PHYSICAL DATA
[1] CONCENTRATION POINT
1 [2] AREA DESIGNATION
ON -SITE
[3] AREA - ACRES
1.230
[4] L -FEET
315
[5] L -MILES
0.060
[6] La -FEET
15.00 [7] La -MILES
0.003
[8] ELEVATION OF HEADWATER
329
(9] ELEVATION OF CONCENTRATION POINT
267
[10] H -FEET
62 [11] S-FEET/MILE
1039.2
[12] S^0.5
32.24 [13] L*LCA/S^0.5
0.000
[14] AVERAGE MANNINGS 'N'
0.02 [15] LAG TIME -HOURS
0.00 [16] LAG TIME -MINUTES
0.3 [17] 100% OF LAG -MINUTES
0.3 [18] 200% OF LAG -MINUTES
0.6 [19] UNIT TIME -MINUTES (100%-200% OF LAG)
5 [24] TOTAL PERCOLATION RATE (cfs)
0.00 RAINFALL DATA
[1] SOURCE
[2] FREQUENCY -YEARS 100
[3] DURATION:
3 -HOURS
6 -HOURS
24 -HOURS
[4]
POINT
RAIN
INCHES
(Plate E-5.2)
[5]
AREA
[6]
[7]
AVERAGE
POINT
RAIN
INCHES
[8]
POINT
RAIN
INCHES
(Plate E-5.4)
[9]
AREA
[10]
[11]
AVERAGE
POINT
RAIN
INCHES
[12]
POINT
RAIN
INCHES
(Plate E-5.6)
[13]
AREA
[14]
[15]
AVERAGE
POINT
RAIN
INCHES
1.50 1.230
1.00 1.50
1.93 1.230
1.00 1.93
2.66 1.230
1.00 2.66
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
SUM [5]
[16] AREA ADJ
[17] ADJ AVG
1.23 SUM [7]
1.50 SUM [9]
1.23 SUM [11]
1.93 SUM [13]
1.23 SUM [15]
2.66 FACTOR
POINT RAIN
1.000
1.000
1.000
1.50 1.93
2.66 STORM EVENT SUMMARY
DURATION
3 -HOUR
6 -HOUR
24 -HOUR
EFFECTIVE RAIN
(in)
0.54 0.51
0.26 FLOOD VOLUME
(cu -ft)
(acre -ft)
2,398
0.06 2,283
0.05 1,178
0.03 REQUIRED STORAGE
(cu -ft)
(acre -ft)
2,379
0.05 2,264
0.05 1,168
0.03 PEAK FLOW
(cfs)
1.35 1.13
0.04 MAXIMUM WSEL
(ft)
-
-
-
2112
Plate E-2.1
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
PROJECT WORLD MUSEUM SOUTH PROP 10 YR EVENT
CONCENTRATION POINT: 1
BY MES R. BAZUA, P.E. DATE 3/28/2025
ADJUSTED LOSS RATE
SOIL
GROUP
[Plate C-1]
LAND USE
RI
NUMBER
[Plate E-6.1]
PERVIOUS
AREA
INFILTRATION
RATE
(in/hr)
[Plate E-6.2]
DECIMAL
PERCENT
OF AREA
IMPERVIOUS
[Plate E-6.3]
ADJUSTED
INFILTRATION
RATE
(in/hr)
AREA
AVERAGE
ADJUSTED
INFILTRATION
RATE
(in/hr)
A
COMMERCIAL
32 0.74
90%
0.14 0.00
0.000
0.0000
A
PAVING/HARDSCAPE
32 0.74
100%
0.07 0.37
0.301
0.0223
A
SF - 1 ACRE
32 0.74
20%
0.61 0.00
0.000
0.0000
A
SF - 1/2 ACRE
32 0.74
40%
0.47 0.00
0.000
0.0000
A
SF - 1/4 ACRE
32 0.74
50%
0.41 0.00
0.000
0.0000
A
MF - CONDOMINIUMS
32 0.74
65%
0.31 0.00
0.000
0.0000
A
MF - APARTMENTS
32 0.74
80%
0.21 0.00
0.000
0.0000
A
MOBILE HOME PARKS
32 0.74
75%
0.24 0.00
0.000
0.0000
A
LANDSCAPING
32 0.74
0%
0.74 0.51
0.415
0.3068
A
RETENTION BASINS
32 0.74
0%
0.74 0.00
0.000
0.0000
A
GOLF COURSE
32 0.74
0%
0.74 0.00
0.000
0.0000
D
MOUNTAINOUS
93 0.95
90%
0.18 0.35
0.285
0.0514
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
0.00 0.000
0.0000
VARIABLE LOSS
Fm=
C=
Ft=C(24-(T/60))^1.55
LOW LOSS RATE
Where:
T=Time in minutes.
T=1 1/2 unit time for
RATE CURVE (24
-HOUR STORM ONLY)
=
value for each unit
etc.
0.00352
SUM
(24-(T/60))^1.55 + 0.19
= 90%
T=1/2 the unit time for the first time period,
1.23 SUM
0.3805
in/hr
0.19022561
0.00352
(80-90 PERCENT)
To get an average
the second period,
time period, Use
2113
Plate E-2.1
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 3 HOUR STORM EVENT
PROJECT: WORLD MUSEUM SOUTH PROP 10 YR EVENT
CONCENTRATION POINT: 1
BY: IES R. BAZUA, DATE 3/28/2025
EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.23
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.28
UNIT TIME -PERCENT OF LAG 1760.7
TOTAL ADJUSTED STORM RAIN -INCHES 1.50
CONSTANT LOSS RATE-in/hr 0.38
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 5
0.08 1.3
0.234
0.38 0.21
0.02 0.03
8.63 2
10 0.17
1.3 0.234
0.38 0.21
0.02 0.03
8.63 3
15 0.25
1.1 0.198
0.38 0.18
0.02 0.02
7.31 4
20 0.33
1.5 0.270
0.38 0.24
0.03 0.03
9.96 5
25 0.42
1.5 0.270
0.38 0.24
0.03 0.03
9.96 6
30 0.50
1.8 0.324
0.38 0.29
0.03 0.04
11.96 7
35 0.58
1.5 0.270
0.38 0.24
0.03 0.03
9.96 8
40 0.67
1.8 0.324
0.38 0.29
0.03 0.04
11.96 9
45 0.75
1.8 0.324
0.38 0.29
0.03 0.04
11.96 10
50 0.83
1.5 0.270
0.38 0.24
0.03 0.03
9.96 11
55 0.92
1.6 0.288
0.38 0.26
0.03 0.04
10.63 12
60 1.00
1.8 0.324
0.38 0.29
0.03 0.04
11.96 13
65 1.08
2.2 0.396
0.38 0.36
0.02 0.02
5.74 14
70 1.17
2.2 0.396
0.38 0.36
0.02 0.02
5.74 15
75 1.25
2.2 0.396
0.38 0.36
0.02 0.02
5.74 16
80 1.33
2.0 0.360
0.38 0.32
0.04 0.04
13.28 17
85 1.42
2.6 0.468
0.38 0.42
0.09 0.11
32.31 18
90 1.50
2.7 0.486
0.38 0.44
0.11 0.13
38.95 19
95 1.58
2.4 0.432
0.38 0.39
0.05 0.06
19.02 20
100
1.67 2.7
0.486
0.38 0.44
0.11 0.13
38.95 21
105
1.75 3.3
0.594
0.38 0.53
0.21 0.26
78.80 22
110
1.83 3.1
0.558
0.38 0.50
0.18 0.22
65.52 23
115
1.92 2.9
0.522
0.38 0.47
0.14 0.17
52.23 24
120
2.00 3.0
0.540
0.38 0.49
0.16 0.20
58.87 25
125
2.08 3.1
0.558
0.38 0.50
0.18 0.22
65.52 26
130
2.17 4.2
0.756
0.38 0.68
0.38 0.46
138.58
27 135
2.25 5.0
0.900
0.38 0.81
0.52 0.64
191.71
28 140
2.33 3.5
0.630
0.38 0.57
0.25 0.31
92.08 29
145
2.42 6.8
1.224
0.38 1.10
0.84 1.04
311.27
30 150
2.50 7.3
1.314
0.38 1.18
0.93 1.15
344.48
31 155
2.58 8.2
1.476
0.38 1.33
1.10 1.35
404.26
32 160
2.67 5.9
1.062
0.38 0.96
0.68 0.84
251.49
33 165
2.75 2.0
0.360
0.38 0.32
0.04 0.04
13.28 34
170
2.83 1.8
0.324
0.38 0.29
0.03 0.04
11.96 35
175
2.92 1.8
0.324
0.38 0.29
0.03 0.04
11.96 36
180
3.00 0.6
0.108
0.38 0.10
0.01 0.01
3.99 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cuft)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cuft)
PEAK FLOW RATE (cfs)
0.54 0.06
2398.41
0.05 2378.58
1.35 2114
Plate E-2.2
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 6 HOUR STORM EVENT
PROJECT: WORLD MUSEUM SOUTH PROP 10 YR EVEI,
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025
EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.23
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.28
UNIT TIME -PERCENT OF LAG 1760.7
TOTAL ADJUSTED STORM RAIN -INCHES 1.93
CONSTANT LOSS RATE-in/hr 0.380
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 5
0.08 0.5
0.116
0.38 0.10
0.01 0.01
4.27 2
10 0.17
0.6 0.139
0.38 0.13
0.01 0.02
5.13 3
15 0.25
0.6 0.139
0.38 0.13
0.01 0.02
5.13 4
20 0.33
0.6 0.139
0.38 0.13
0.01 0.02
5.13 5
25 0.42
0.6 0.139
0.38 0.13
0.01 0.02
5.13 6
30 0.50
0.7 0.162
0.38 0.15
0.02 0.02
5.98 7
35 0.58
0.7 0.162
0.38 0.15
0.02 0.02
5.98 8
40 0.67
0.7 0.162
0.38 0.15
0.02 0.02
5.98 9
45 0.75
0.7 0.162
0.38 0.15
0.02 0.02
5.98 10
50 0.83
0.7 0.162
0.38 0.15
0.02 0.02
5.98 11
55 0.92
0.7 0.162
0.38 0.15
0.02 0.02
5.98 12
60 1.00
0.8 0.185
0.38 0.17
0.02 0.02
6.84 13
65 1.08
0.8 0.185
0.38 0.17
0.02 0.02
6.84 14
70 1.17
0.8 0.185
0.38 0.17
0.02 0.02
6.84 15
75 1.25
0.8 0.185
0.38 0.17
0.02 0.02
6.84 16
80 1.33
0.8 0.185
0.38 0.17
0.02 0.02
6.84 17
85 1.42
0.8 0.185
0.38 0.17
0.02 0.02
6.84 18
90 1.50
0.8 0.185
0.38 0.17
0.02 0.02
6.84 19
95 1.58
0.8 0.185
0.38 0.17
0.02 0.02
6.84 20
100
1.67 0.8
0.185
0.38 0.17
0.02 0.02
6.84 21
105
1.75 0.8
0.185
0.38 0.17
0.02 0.02
6.84 22
110
1.83 0.8
0.185
0.38 0.17
0.02 0.02
6.84 23
115
1.92 0.8
0.185
0.38 0.17
0.02 0.02
6.84 24
120
2.00 0.9
0.208
0.38 0.19
0.02 0.03
7.69 25
125
2.08 0.8
0.185
0.38 0.17
0.02 0.02
6.84 26
130
2.17 0.9
0.208
0.38 0.19
0.02 0.03
7.69 27
135
2.25 0.9
0.208
0.38 0.19
0.02 0.03
7.69 28
140
2.33 0.9
0.208
0.38 0.19
0.02 0.03
7.69 29
145
2.42 0.9
0.208
0.38 0.19
0.02 0.03
7.69 30
150
2.50 0.9
0.208
0.38 0.19
0.02 0.03
7.69 31
155
2.58 0.9
0.208
0.38 0.19
0.02 0.03
7.69 32
160
2.67 0.9
0.208
0.38 0.19
0.02 0.03
7.69 33
165
2.75 1.0
0.232
0.38 0.21
0.02 0.03
8.55 34
170
2.83 1.0
0.232
0.38 0.21
0.02 0.03
8.55 35
175
2.92 1.0
0.232
0.38 0.21
0.02 0.03
8.55 36
180
3.00 1.0
0.232
0.38 0.21
0.02 0.03
8.55 37
185
3.08 1.0
0.232
0.38 0.21
0.02 0.03
8.55 38
190
3.17 1.1
0.255
0.38 0.23
0.03 0.03
9.40 39
195
3.25 1.1
0.255
0.38 0.23
0.03 0.03
9.40 40
200
3.33 1.1
0.255
0.38 0.23
0.03 0.03
9.40 41
205
3.42 1.2
0.278
0.38 0.25
0.03 0.03
10.26 42
210
3.50 1.3
0.301
0.38 0.27
0.03 0.04
11.11 43
215
3.58 1.4
0.324
0.38 0.29
0.03 0.04
11.96 44
220
3.67 1.4
0.324
0.38 0.29
0.03 0.04
11.96 45
225
3.75 1.5
0.347
0.38 0.31
0.03 0.04
12.82 46
230
3.83 1.5
0.347
0.38 0.31
0.03 0.04
12.82 47
235
3.92 1.6
0.371
0.38 0.33
0.04 0.05
13.67 48
240
4.00 1.6
0.371
0.38 0.33
0.04 0.05
13.67 49
245
4.08 1.7
0.394
0.38 0.35
0.01 0.02
4.90 50
250
4.17 1.8
0.417
0.38 0.38
0.04 0.04
13.44 51
255
4.25 1.9
0.440
0.38 0.40
0.06 0.07
21.99 52
260
4.33 2.0
0.463
0.38 0.42
0.08 0.10
30.53 53
265
4.42 2.1
0.486
0.38 0.44
0.11 0.13
39.08 54
270
4.50 2.1
0.486
0.38 0.44
0.11 0.13
39.08 55
275
4.58 2.2
0.510
0.38 0.46
0.13 0.16
47.63 56
280
4.67 2.3
0.533
0.38 0.48
0.15 0.19
56.17 2115
Plate E-2.2
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 6 HOUR STORM EVENT
PROJECT: WORLD MUSEUM SOUTH PROP 10 YR EVE,
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025
EFFECTIVE RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.23
UNIT TIME -MINUTES 5
LAG TIME - MINUTES 0.28
UNIT TIME -PERCENT OF LAG 1760.7
TOTAL ADJUSTED STORM RAIN -INCHES 1.93
CONSTANT LOSS RATE-in/hr 0.380
LOW LOSS RATE - PERCENT 90%
TOTAL PERCOLATION RATE (cfs) 0.00 cfs
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
57 285
4.75 2.4
0.556
0.38 0.50
0.18 0.22
64.72 58
290
4.83 2.4
0.556
0.38 0.50
0.18 0.22
64.72 59
295
4.92 2.5
0.579
0.38 0.52
0.20 0.24
73.26 60
300
5.00 2.6
0.602
0.38 0.54
0.22 0.27
81.81 61
305
5.08 3.1
0.718
0.38 0.65
0.34 0.42
124.54
62 310
5.17 3.6
0.834
0.38 0.75
0.45 0.56
167.27
63 315
5.25 3.9
0.903
0.38 0.81
0.52 0.64
192.91
64 320
5.33 4.2
0.973
0.38 0.88
0.59 0.73
218.55
65 325
5.42 4.7
1.089
0.38 0.98
0.71 0.87
261.28
66 330
5.50 5.6
1.297
0.38 1.17
0.92 1.13
338.19
67 335
5.58 1.9
0.440
0.38 0.40
0.06 0.07
21.99 68
340
5.67 0.9
0.208
0.38 0.19
0.02 0.03
7.69 69
345
5.75 0.6
0.139
0.38 0.13
0.01 0.02
5.13 70
350
5.83 0.5
0.116
0.38 0.10
0.01 0.01
4.27 71
355
5.92 0.3
0.069
0.38 0.06
0.01 0.01
2.56 72
360
6.00 0.2
0.046
0.38 0.04
0.00 0.01
1.71 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cuft)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cuft)
PEAK FLOW RATE (cfs)
0.51 0.05
2282.59
0.05 2263.72
1.13 2116
Plate E-2.2
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 24 HOUR STORM EVENT
PROJECT: WORLD MUSEUM SOUTH PROP 10 YR EVEP
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025
EFFECTIVE
RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.230
UNIT TIME -MINUTES 15
LAG TIME - MINUTES 0.28
UNIT TIME -PERCENT OF LAG 5282.1
TOTAL ADJUSTED STORM RAIN -INCHES 2.66
CONSTANT LOSS RATE-in/hr n/a
VARIABLE LOSS RATE (AVG) in/hr 0.3805
MINIMUM LOSS RATE (for var. loss) - in/hr 0.190
LOW LOSS RATE - DECIMAL 0.90
C 0.00352
PERCOLATION RATE (cfs) 0.00
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
1 15
0.25 0.2
0.021
0.672
0.019
0.002
0.00 2.36
2 30
0.50 0.3
0.032
0.664
0.029
0.003
0.00 3.53
3 45
0.75 0.3
0.032
0.656
0.029
0.003
0.00 3.53
4 60
1.00 0.4
0.043
0.649
0.038
0.004
0.01 4.71
5 75
1.25 0.3
0.032
0.641
0.029
0.003
0.00 3.53
6 90
1.50 0.3
0.032
0.633
0.029
0.003
0.00 3.53
7 105
1.75 0.3
0.032
0.626
0.029
0.003
0.00 3.53
8 120
2.00 0.4
0.043
0.618
0.038
0.004
0.01 4.71
9 135
2.25 0.4
0.043
0.611
0.038
0.004
0.01 4.71
10 150
2.50 0.4
0.043
0.603
0.038
0.004
0.01 4.71
11 165
2.75 0.5
0.053
0.596
0.048
0.005
0.01 5.89
12 180
3.00 0.5
0.053
0.589
0.048
0.005
0.01 5.89
13 195
3.25 0.5
0.053
0.581
0.048
0.005
0.01 5.89
14 210
3.50 0.5
0.053
0.574
0.048
0.005
0.01 5.89
15 225
3.75 0.5
0.053
0.567
0.048
0.005
0.01 5.89
16 240
4.00 0.6
0.064
0.560
0.057
0.006
0.01 7.07
17 255
4.25 0.6
0.064
0.553
0.057
0.006
0.01 7.07
18 270
4.50 0.7
0.074
0.546
0.067
0.007
0.01 8.24
19 285
4.75 0.7
0.074
0.539
0.067
0.007
0.01 8.24
20 300
5.00 0.8
0.085
0.532
0.077
0.009
0.01 9.42
21 315
5.25 0.6
0.064
0.525
0.057
0.006
0.01 7.07
22 330
5.50 0.7
0.074
0.518
0.067
0.007
0.01 8.24
23 345
5.75 0.8
0.085
0.511
0.077
0.009
0.01 9.42
24 360
6.00 0.8
0.085
0.504
0.077
0.009
0.01 9.42
25 375
6.25 0.9
0.096
0.498
0.086
0.010
0.01 10.60
26 390
6.50 0.9
0.096
0.491
0.086
0.010
0.01 10.60
27 405
6.75 1.0
0.106
0.485
0.096
0.011
0.01 11.78
28 420
7.00 1.0
0.106
0.478
0.096
0.011
0.01 11.78
29 435
7.25 1.0
0.106
0.471
0.096
0.011
0.01 11.78
30 450
7.50 1.1
0.117
0.465
0.105
0.012
0.01 12.96
31 465
7.75 1.2
0.128
0.459
0.115
0.013
0.02 14.13
32 480
8.00 1.3
0.138
0.452
0.124
0.014
0.02 15.31
33 495
8.25 1.5
0.160
0.446
0.144
0.016
0.02 17.67
34 510
8.50 1.5
0.160
0.440
0.144
0.016
0.02 17.67
35 525
8.75 1.6
0.170
0.434
0.153
0.017
0.02 18.85
36 540
9.00 1.7
0.181
0.428
0.163
0.018
0.02 20.02
37 555
9.25 1.9
0.202
0.422
0.182
0.020
0.02 22.38
38 570
9.50 2.0
0.213
0.416
0.192
0.021
0.03 23.56
39 585
9.75 2.1
0.223
0.410
0.201
0.022
0.03 24.73
40 600
10.00 2.2
0.234
0.404
0.211
0.023
0.03 25.91
41 615
10.25 1.5
0.160
0.398
0.144
0.016
0.02 17.67
42 630
10.50 1.5
0.160
0.392
0.144
0.016
0.02 17.67
43 645
10.75 2.0
0.213
0.386
0.192
0.021
0.03 23.56
44 660
11.00 2.0
0.213
0.381
0.192
0.021
0.03 23.56
45 675
11.25 1.9
0.202
0.375
0.182
0.020
0.02 22.38
46 690
11.50 1.9
0.202
0.370
0.182
0.020
0.02 22.38
47 705
11.75 1.7
0.181
0.364
0.163
0.018
0.02 20.02
48 720
12.00 1.8
0.192
0.359
0.172
0.019
0.02 21.20
49 735
12.25 2.5
0.266
0.353
0.239
0.027
0.03 29.45
50 750
12.50 2.6
0.277
0.348
0.249
0.028
0.03 30.62
51 765
12.75 2.8
0.298
0.343
0.268
0.030
0.04 32.98
52 780
13.00 2.9
0.309
0.338
0.278
0.031
0.04 34.16
53 795
13.25 3.4
0.362
0.333
0.326
0.029
0.04 32.31
54 810
13.50 3.4
0.362
0.328
0.326
0.034
0.04 37.89
55 825
13.75 2.3
0.245
0.323
0.220
0.024
0.03 27.09
56 840
14.00 2.3
0.245
0.318
0.220
0.024
0.03 27.09
57 855
14.25 2.7
0.287
0.313
0.259
0.029
0.04 31.80
58 870
14.50 2.6
0.277
0.308
0.249
0.028
0.03 30.62
59 885
14.75 2.6
0.277
0.303
0.249
0.028
0.03 30.62
60 900
15.00 2.5
0.266
0.299
0.239
0.027
0.03 29.45
61 915
15.25 2.4
0.255
0.294
0.230
0.026
0.03 28.27
62 930
15.50 2.3
0.245
0.290
0.220
0.024
0.03 27.09
63 945
15.75 1.9
0.202
0.285
0.182
0.020
0.02 22.38
64 960
16.00 1.9
0.202
0.281
0.182
0.020
0.02 22.38
65 975
16.25 0.4
0.043
0.277
0.038
0.004
0.01 4.71
66 990
16.50 0.4
0.043
0.272
0.038
0.004
0.01 4.71
67 1005
16.75 0.3
0.032
0.268
0.029
0.003
0.00 3.53
T
2117
Plate E-2.2
RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD
100 YEAR - 24 HOUR STORM EVENT
PROJECT: WORLD MUSEUM SOUTH PROP 10 YR EVEP
CONCENTRATION POINT: 1
BY: JAMES R. BAZ DATE: 3/28/2025
EFFECTIVE
RAIN CALCULATION FORM
DRAINAGE AREA -ACRES 1.230
UNIT TIME -MINUTES 15
LAG TIME - MINUTES 0.28
UNIT TIME -PERCENT OF LAG 5282.1
TOTAL ADJUSTED STORM RAIN -INCHES 2.66
CONSTANT LOSS RATE-in/hr n/a
VARIABLE LOSS RATE (AVG) in/hr 0.3805
MINIMUM LOSS RATE (for var. loss) - in/hr 0.190
LOW LOSS RATE - DECIMAL 0.90
C 0.00352
PERCOLATION RATE (cfs) 0.00
Unit Time
Period
Time
Minutes Hours
Pattern
Percent
(Plate E-5.9)
Storm
Rain
in/hr
Loss Rate
in/hr
Max Low
Effective
Rain
in/hr
Flood
Hydrograph
Flow
cfs
Required
Storage
cf
68 1020
17.00 0.3
0.032
0.264
0.029
0.003
0.00 3.53
69 1035
17.25 0.5
0.053
0.260
0.048
0.005
0.01 5.89
70 1050
17.50 0.5
0.053
0.256
0.048
0.005
0.01 5.89
71 1065
17.75 0.5
0.053
0.252
0.048
0.005
0.01 5.89
72 1080
18.00 0.4
0.043
0.249
0.038
0.004
0.01 4.71
73 1095
18.25 0.4
0.043
0.245
0.038
0.004
0.01 4.71
74 1110
18.50 0.4
0.043
0.241
0.038
0.004
0.01 4.71
75 1125
18.75 0.3
0.032
0.238
0.029
0.003
0.00 3.53
76 1140
19.00 0.2
0.021
0.235
0.019
0.002
0.00 2.36
77 1155
19.25 0.3
0.032
0.231
0.029
0.003
0.00 3.53
78 1170
19.50 0.4
0.043
0.228
0.038
0.004
0.01 4.71
79 1185
19.75 0.3
0.032
0.225
0.029
0.003
0.00 3.53
80 1200
20.00 0.2
0.021
0.222
0.019
0.002
0.00 2.36
81 1215
20.25 0.3
0.032
0.219
0.029
0.003
0.00 3.53
82 1230
20.50 0.3
0.032
0.216
0.029
0.003
0.00 3.53
83 1245
20.75 0.3
0.032
0.213
0.029
0.003
0.00 3.53
84 1260
21.00 0.2
0.021
0.211
0.019
0.002
0.00 2.36
85 1275
21.25 0.3
0.032
0.208
0.029
0.003
0.00 3.53
86 1290
21.50 0.2
0.021
0.206
0.019
0.002
0.00 2.36
87 1305
21.75 0.3
0.032
0.204
0.029
0.003
0.00 3.53
88 1320
22.00 0.2
0.021
0.202
0.019
0.002
0.00 2.36
89 1335
22.25 0.3
0.032
0.200
0.029
0.003
0.00 3.53
90 1350
22.50 0.2
0.021
0.198
0.019
0.002
0.00 2.36
91 1365
22.75 0.2
0.021
0.196
0.019
0.002
0.00 2.36
92 1380
23.00 0.2
0.021
0.194
0.019
0.002
0.00 2.36
93 1395
23.25 0.2
0.021
0.193
0.019
0.002
0.00 2.36
94 1410
23.50 0.2
0.021
0.192
0.019
0.002
0.00 2.36
95 1425
23.75 0.2
0.021
0.191
0.019
0.002
0.00 2.36
96 1440
24.00 0.2
0.021
0.190
0.019
0.002
0.00 2.36
EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY
EFFECTIVE RAIN (in)
FLOOD VOLUME (acft)
FLOOD VOLUME (cult)
REQUIRED STORAGE (acft)
REQUIRED STORAGE (cult)
PEAK FLOW (cfs)
0.26 0.03
1177.70
0.03 1167.96
0.04 T
2118
Plate E-2.2
PROJECT: WORLD MUSEUM SOUTH PROP 10 YR EVENT
JOB # C2026
1 BASIN CHARACTERISTICS
CONTOUR
DEPTH
INCR TOTAL
(ft) (ft)
AREA
INCR TOTAL
(sf) (sf)
VOLUME
INCR TOTAL
(cuft) (cuft) (acre -ft)
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 0
0 0
0 0
0 0
0.00 PERCOLATION CALCULATIONS
PERCOLATION RATE
MAXWELL IV DRYWELLS
NUMBER USED
RATE/DRYWELL
TOTAL DISSIPATED
TOTAL PERCOLATION RATE
0 in/hr
0 0 cfs
0.00 cfs
0 cfs
0.00 cfs
Basin Characteristics
2119
1 JOB # C2026
100 YEAR - 3 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)
TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
BALANCE IN
BASIN
(cuft) (acre -ft)
1 5
0.03 9
9 0
9 -
9 0.00
2 10
0.03 9
17 0
17 -
17 0.00
3 15
0.02 7
25 0
25 -
25 0.00
4 20
0.03 10
35 0
35 -
35 0.00
5 25
0.03 10
45 0
45 -
45 0.00
6 30
0.04 12
56 0
56 -
56 0.00
7 35
0.03 10
66 0
66 -
66 0.00
8 40
0.04 12
78 0
78 -
78 0.00
9 45
0.04 12
90 0
90 -
90 0.00
10 50
0.03 10
100
0 100
-
100
0.00 11
55 0.04
11 111
0 111
-
111
0.00 12
60 0.04
12 123
0 123
-
123
0.00 13
65 0.02
6 129
0 129
-
129
0.00 14
70 0.02
6 134
0 134
-
134
0.00 15
75 0.02
6 140
0 140
-
140
0.00 16
80 0.04
13 153
0 153
-
153
0.00 17
85 0.11
32 186
0 186
-
186
0.00 18
90 0.13
39 225
0 225
-
225
0.01 19
95 0.06
19 244
0 244
-
244
0.01 20
100
0.13 39
283
0 283
-
283
0.01 21
105
0.26 79
361
0 361
-
361
0.01 22
110
0.22 66
427
0 427
-
427
0.01 23
115
0.17 52
479
0 479
-
479
0.01 24
120
0.20 59
538
0 538
-
538
0.01 25
125
0.22 66
604
0 604
-
604
0.01 26
130
0.46 139
742
0 742
-
742
0.02 27
135
0.64 192
934
0 934
-
934
0.02 28
140
0.31 92
1,026
0 1,026
-
1,026
0.02 29
145
1.04 311
1,337
0 1,337
-
1,337
0.03 30
150
1.15 344
1,682
0 1,682
-
1,682
0.04 31
155
1.35 404
2,086
0 2,086
-
2,086
0.05 32
160
0.84 251
2,337
0 2,337
-
2,337
0.05 33
165
0.04 13
2,351
0 2,351
-
2,351
0.05 34
170
0.04 12
2,363
0 2,363
-
2,363
0.05 35
175
0.04 12
2,375
0 2,375
-
2,375
0.05 36
180
0.01 4
2,379
0 2,379
-
2,379
0.05 2120
Basin Depth Analysis
1 JOB # C2026
100 YEAR - 6 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
5 0.01
2 10
3 VOLUME
IN
(cuft)
0.02 5
15 0.02
4 20
5 25
6 30
7 35
5 0.02 5
0.02 5
0.02 6
0.02 6
8 40
9 45
10 50
11 55
0.02 6
0.02 6
0.02 6
0.02 6
12 60
0.02 7
13 65
0.02 7
14 70
0.02 7
15 75
0.02 7
16 80
0.02 7
17 85
0.02 7
18 90
0.02 7
19 95
0.02 7
20 100 0.02 7
21 105 0.02 7
22 110 0.02 7
23 115 0.02 7
24 120 0.03 8
25 125 0.02 7
26 130 0.03 8
27 135 0.03 8
28 140 0.03 8
29 145 0.03 8
30 150 0.03 8
31 155 0.03 8
32 160 0.03 8
33 165 0.03 9
34 170 0.03 9
35 175 0.03 9
36 180 0.03 9
37 185 0.03 9
38 190 0.03 9
39 195 0.03 9
40 200 0.03
41 205
42 210
43 215
TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)
TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
4 9
15 20
25 31
37 0
0 0
0 0
0 0
4 9
15 20
25 31
37 43
0 43
49 0
49 55
0 55
61 0
61 68
0 68
74 0 74
81 0 81
88 0 88
95 0 95
102
0 102
109
0 109
115
0 115
122
0 122
129
0 129
136
0 136
143
0 143
150
0 150
157
0 157
165
0 165
173
0 173
180
0 180
188
0 188
196
0 196
203
0 203
211
0 211
220
0 220
228
0 228
237
0 237
245
0 245
254
0 254
263
0 263
273
0 273
BALANCE IN
BASIN
(cuft) (acre -ft)
4 9
15 20
25 31
37 43
49 55
61 68
74 81
88 95
102
109
115
122
129
136
143
150
157
165
173
180
188
196
203
211
220
228
237
245
254
263
273
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.00 0.00
0.01 0.01
0.01 0.01
0.01 0.01
0.01 9 282 0 282 - 282 0.01
0.03 10 292 0 292 - 292 0.01
0.04 11 303 0 303 - 303 0.01
0.04 12 315 0 315 - 315 0.01
44 220 0.04 12
45 225 0.04 13
46 230 0.04 13
47 235 0.05 14
48 240 0.05 14
49 245 0.02 5
50 250 0.04 13
51 255 0.07 22
52 260 0.10 31
53 265 0.13 39
54 270 0.13 39
55 275 0.16 48
327
0 327
340
0 340
353
0 353
367
0 367
380
0 380
385
0 385
399
0 399
421
0 421
451
0 451
490
0 490
529
0 529
577
0 577
327
340
353
367
380
385
399
421
451
490
529
577
0.01 0.01
0.01 0.01
0.01 0.01
0.01 0.01
0.01 0.01
0.01 0.01
2121
Basin Depth Analysis
1 JOB # C2026
100 YEAR - 6 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)
TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
BALANCE IN
BASIN
(cuft) (acre -ft)
56 280
0.19 56
633
0 633
-
633
0.01 57
285
0.22 65
698
0 698
-
698
0.02 58
290
0.22 65
763
0 763
-
763
0.02 59
295
0.24 73
836
0 836
-
836
0.02 60
300
0.27 82
918
0 918
-
918
0.02 61
305
0.42 125
1,042
0 1,042
-
1,042
0.02 62
310
0.56 167
1,209
0 1,209
-
1,209
0.03 63
315
0.64 193
1,402
0 1,402
-
1,402
0.03 64
320
0.73 219
1,621
0 1,621
-
1,621
0.04 65
325
0.87 261
1,882
0 1,882
-
1,882
0.04 66
330
1.13 338
2,220
0 2,220
-
2,220
0.05 67
335
0.07 22
2,242
0 2,242
-
2,242
0.05 68
340
0.03 8
2,250
0 2,250
-
2,250
0.05 69
345
0.02 5
2,255
0 2,255
-
2,255
0.05 70
350
0.01 4
2,259
0 2,259
-
2,259
0.05 71
355
0.01 3
2,262
0 2,262
-
2,262
0.05 72
360
0.01 2
2,264
0 2,264
-
2,264
0.05 2122
Basin Depth Analysis
1 JOB # C2026
100 YEAR - 24 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
TOTAL IN
BASIN
(cuft)
PERC TOTAL IN
OUT BASIN
(cuft) (cuft)
BASIN
DEPTH
(ft)
BALANCE IN
BASIN
(cuft) (acre -ft)
1 15
0.00 2
2 0 2
2 0.00
2 30
0.00 4
6 0 6
6 0.00
3 45
0.00 4
9 0 9
9 0.00
4 60
0.01 5
14 0 14
14 0.00
5 75
0.00 4
18 0 18
18 0.00
6 90
0.00 4
21 0 21
21 0.00
7 105
0.00 4
25 0 25
25 0.00
8 120
0.01 5
29 0 29
29 0.00
9 135
0.01 5
34 0 34
34 0.00
10 150
0.01 5
39 0 39
39 0.00
11 165
0.01 6
45 0 45
45 0.00
12 180
0.01 6
51 0 51
51 0.00
13 195
0.01 6
57 0 57
57 0.00
14 210
0.01 6
62 0 62
62 0.00
15 225
0.01 6
68 0 68
68 0.00
16 240
0.01 7
75 0 75
75 0.00
17 255
0.01 7
82 0 82
82 0.00
18 270
0.01 8
91 0 91
91 0.00
19 285
0.01 8
99 0 99
99 0.00
20 300
0.01 9
108
0 108
108
0.00 21
315
0.01 7
115
0 115
115
0.00 22
330
0.01 8
124
0 124
124
0.00 23
345
0.01 9
133
0 133
133
0.00 24
360
0.01 9
143
0 143
143
0.00 25
375
0.01 11
153
0 153
153
0.00 26
390
0.01 11
164
0 164
164
0.00 27
405
0.01 12
175
0 175
175
0.00 28
420
0.01 12
187
0 187
187
0.00 29
435
0.01 12
199
0 199
199
0.00 30
450
0.01 13
212
0 212
212
0.00 31
465
0.02 14
226
0 226
226
0.01 32
480
0.02 15
241
0 241
241
0.01 33
495
0.02 18
259
0 259
259
0.01 34
510
0.02 18
277
0 277
277
0.01 35
525
0.02 19
296
0 296
296
0.01 36
540
0.02 20
316
0 316
316
0.01 37
555
0.02 22
338
0 338
338
0.01 38
570
0.03 24
362
0 362
362
0.01 39
585
0.03 25
386
0 386
386
0.01 40
600
0.03 26
412
0 412
412
0.01 41
615
0.02 18
430
0 430
430
0.01 42
630
0.02 18
448
0 448
448
0.01 43
645
0.03 24
471
0 471
471
0.01 44
660
0.03 24
495
0 495
495
0.01 45
675
0.02 22
517
0 517
517
0.01 46
690
0.02 22
539
0 539
539
0.01 47
705
0.02 20
559
0 559
559
0.01 48
720
0.02 21
581
0 581
581
0.01 49
735
0.03 29
610
0 610
610
0.01 50
750
0.03 31
641
0 641
641
0.01 51
765
0.04 33
674
0 674
674
0.02 52
780
0.04 34
708
0 708
708
0.02 53
795
0.04 32
740
0 740
740
0.02 54
810
0.04 38
778
0 778
778
0.02 55
825
0.03 27
805
0 805
805
0.02 56
840
0.03 27
832
0 832
832
0.02 57
855
0.04 32
864
0 864
864
0.02 58
870
0.03 31
895
0 895
895
0.02 2123
Basin Depth Analysis
1 JOB # C2026
100 YEAR - 24 HOUR STORM EVENT
TIME
UNIT (min)
PERIOD
FLOW
IN
(cfs)
VOLUME
IN
(cuft)
TOTAL IN
BASIN
(cuft)
PERC
OUT
(cuft)
TOTAL IN
BASIN
(cuft)
BASIN
DEPTH
(ft)
BALANCE IN
BASIN
(cuft) (acre -ft)
59 885
0.03 31
925
0 925
-
925
0.02 60
900
0.03 29
955
0 955
-
955
0.02 61
915
0.03 28
983
0 983
-
983
0.02 62
930
0.03 27
1,010
0 1,010
-
1,010
0.02 63
945
0.02 22
1,033
0 1,033
-
1,033
0.02 64
960
0.02 22
1,055
0 1,055
-
1,055
0.02 65
975
0.01 5
1,060
0 1,060
-
1,060
0.02 66
990
0.01 5
1,064
0 1,064
-
1,064
0.02 67
1005
0.00 4
1,068
0 1,068
-
1,068
0.02 68
1020
0.00 4
1,071
0 1,071
-
1,071
0.02 69
1035
0.01 6
1,077
0 1,077
-
1,077
0.02 70
1050
0.01 6
1,083
0 1,083
-
1,083
0.02 71
1065
0.01 6
1,089
0 1,089
-
1,089
0.03 72
1080
0.01 5
1,094
0 1,094
-
1,094
0.03 73
1095
0.01 5
1,098
0 1,098
-
1,098
0.03 74
1110
0.01 5
1,103
0 1,103
-
1,103
0.03 75
1125
0.00 4
1,107
0 1,107
-
1,107
0.03 76
1140
0.00 2
1,109
0 1,109
-
1,109
0.03 77
1155
0.00 4
1,113
0 1,113
-
1,113
0.03 78
1170
0.01 5
1,117
0 1,117
-
1,117
0.03 79
1185
0.00 4
1,121
0 1,121
-
1,121
0.03 80
1200
0.00 2
1,123
0 1,123
-
1,123
0.03 81
1215
0.00 4
1,127
0 1,127
-
1,127
0.03 82
1230
0.00 4
1,130
0 1,130
-
1,130
0.03 83
1245
0.00 4
1,134
0 1,134
-
1,134
0.03 84
1260
0.00 2
1,136
0 1,136
-
1,136
0.03 85
1275
0.00 4
1,140
0 1,140
-
1,140
0.03 86
1290
0.00 2
1,142
0 1,142
-
1,142
0.03 87
1305
0.00 4
1,146
0 1,146
-
1,146
0.03 88
1320
0.00 2
1,148
0 1,148
-
1,148
0.03 89
1335
0.00 4
1,151
0 1,151
-
1,151
0.03 90
1350
0.00 2
1,154
0 1,154
-
1,154
0.03 91
1365
0.00 2
1,156
0 1,156
-
1,156
0.03 92
1380
0.00 2
1,159
0 1,159
-
1,159
0.03 93
1395
0.00 2
1,161
0 1,161
-
1,161
0.03 94
1410
0.00 2
1,163
0 1,163
-
1,163
0.03 95
1425
0.00 2
1,166
0 1,166
-
1,166
0.03 96
1440
0.00 2
1,168
0 1,168
-
1,168
0.03 2124
Basin Depth Analysis
V RUNOFF DISCHARGE CALCULATIONS
NORTH
Surface runoff on generated on the northerly portion of the project site is directed to an on -site curb inlet catch basin. Under the existing condition, runoff collected in the curb inlet catch basin enters an existing 24" storm drain pipe and is conveyed off -site. Under the proposed condition, runoff collected in the curb inlet catch basin will be diverted to an underground storage facility with the capacity to store 2,439 cu.ft. of runoff volume.
Any runoff that exceeds the capacity of the underground storage facility will then enter the existing 24" storm drain pipe where it will be conveyed off -site as it is under existing conditions.
The volume that enters the existing 24" storm drain pipe to be conveyed off -site is less under the proposed condition that it is under the existing condition. As the runoff volume under both conditions leaves the same conduit with equal size and slope, the discharges (Q) leaving the site for existing vs proposed conditions is proportional to the calculated volumes leaving the 24" conduit for both conditions.
2 YR DISCHARGE (Q)
(CFS) LEAVING SITE
10 YR DISCHARGE (Q)
(CFS) LEAVING SITE
NORTH EXISTING
3.88 10.73
NORTH PROPOSED
0 10.13
SOUTH
Surface runoff generated on the southerly portion of the site flows in a southeasterly direction. Under the existing condition, surface runoff flows to the southeasterly property boundary, against an existing perimeter wall, then follows the wall along a mild slope toward the south and ultimately leaves the site. Under the proposed condition, surface flow is directed toward a surface infiltration type detention basin with capacity to store the total runoff generated during the 10 year rain event, therefore no runoff is discharged off of the southerly portion of the site during the 2 year and 10 year events under proposed conditions. 2 YR DISCHARGE (Q)
(CFS) LEAVING SITE
10 YR DISCHARGE (Q)
(CFS) LEAVING SITE
SOUTH EXISTING
0.23 0.63
SOUTH PROPOSED
0 0
2125
Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2005 Version Rational Hydrology Study Date: 03/20/25
File:NORTHEXISTING2YR.out
7.1 NORTH EXISTING 2 YEAR DISCHARGE
*********
Hydrology Study Control Information **********
English (in -lb) Units used in input data file
Program License Serial Number 6253
Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District 1978 hydrology manual
Storm event (year) = 2.00 Antecedent Moisture Condition = 1 2 year, 1 hour precipitation = 0.455(In.)
100 year, 1 hour precipitation = 2.410(In.)
Storm event year = 2.0
Calculated rainfall intensity data:
1 hour intensity = 0.455(In/Hr)
Slope of intensity duration curve = 0.5700
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++
Process from Point/Station 100.000 to Point/Station
101.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 436.000(Ft.)
Top (of initial area) elevation = 356.000(Ft.)
Bottom (of initial area) elevation = 264.500(Ft.)
Difference in elevation = 91.500(Ft.)
Slope = 0.20986 s(percent)= 20.99
TC = k(0.405)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 6.293 min.
Rainfall intensity = 1.645(In/Hr) for a 2.0 year storm
2126
USER INPUT of soil data for subarea
Runoff Coefficient = 0.620
Decimal fraction soil group A = 0.730
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.270
RI index for soil(AMC 1) = 0.00
Pervious area fraction = 0.550; Impervious fraction = 0.450 Initial subarea runoff = 3.876(CFS)
Total initial stream area 3.800(Ac.)
Pervious area fraction = 0.550
End of computations, total study area = 3.80 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
Area averaged pervious area fraction(Ap) = 0.550
Area averaged RI index number = 0.0
2127
Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2005 Version Rational Hydrology Study Date: 03/20/25
File: NORTHEXISTING10YR.out
7.1 NORTH EXISTING 10 YEAR DISCHARGE
*********
Hydrology Study Control Information **********
English (in -lb) Units used in input data file
Program License Serial Number 6253
Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District 1978 hydrology manual
Storm event (year) = 10.00 Antecedent Moisture Condition = 1 2 year, 1 hour precipitation = 0.455(In.)
100 year, 1 hour precipitation = 2.410(In.)
Storm event year = 10.0
Calculated rainfall intensity data:
1 hour intensity = 1.259(In/Hr)
Slope of intensity duration curve = 0.5700
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++
Process from Point/Station 100.000 to Point/Station
101.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 436.000(Ft.)
Top (of initial area) elevation = 356.000(Ft.)
Bottom (of initial area) elevation = 264.500(Ft.)
Difference in elevation = 91.500(Ft.)
Slope = 0.20986 s(percent)= 20.99
TC = k(0.405)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 6.293 min.
Rainfall intensity = 4.553(In/Hr) for a 10.0 year storm 2128
USER INPUT of soil data for subarea
Runoff Coefficient = 0.620
Decimal fraction soil group A = 0.730
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.270
RI index for soil(AMC 1) = 0.00
Pervious area fraction = 0.550; Impervious fraction = 0.450 Initial subarea runoff = 10.728(CFS)
Total initial stream area 3.800(Ac.)
Pervious area fraction = 0.550
End of computations, total study area = 3.80 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
Area averaged pervious area fraction(Ap) = 0.550
Area averaged RI index number = 0.0
2129
Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2005 Version Rational Hydrology Study Date: 03/20/25
File:NORTHPROPOSED2YR.out
7.1 NORTH PROPOSED 2 YEAR DISCHARGE
*********
Hydrology Study Control Information **********
English (in -lb) Units used in input data file
Program License Serial Number 6253
Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District 1978 hydrology manual
Storm event (year) = 2.00 Antecedent Moisture Condition = 1 2 year, 1 hour precipitation = 0.455(In.)
100 year, 1 hour precipitation = 2.410(In.)
Storm event year = 2.0
Calculated rainfall intensity data:
1 hour intensity = 0.455(In/Hr)
Slope of intensity duration curve = 0.5700
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++
Process from Point/Station 100.000 to Point/Station
101.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 480.000(Ft.)
Top (of initial area) elevation = 356.000(Ft.)
Bottom (of initial area) elevation = 264.500(Ft.)
Difference in elevation = 91.500(Ft.)
Slope = 0.19062 s(percent)= 19.06
TC = k(0.378)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 6.222 min.
Rainfall intensity = 1.656(In/Hr) for a 2.0 year storm
2130
USER INPUT of soil data for subarea
Runoff Coefficient = 0.710
Decimal fraction soil group A = 0.730
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.270
RI index for soil(AMC 1) = 0.00
Pervious area fraction = 0.410; Impervious fraction = 0.590 Initial subarea runoff = 4.467(CFS)
Total initial stream area 3.800(Ac.)
Pervious area fraction = 0.410
End of computations, total study area = 3.80 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
Area averaged pervious area fraction(Ap) = 0.410
Area averaged RI index number = 0.0
2131
Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2005 Version Rational Hydrology Study Date: 03/20/25
File:NORTHPROPOSED10YR.out
7.1 PROPOSED NORTH 10 YEAR DISCHARGE
*********
Hydrology Study Control Information **********
English (in -lb) Units used in input data file
Program License Serial Number 6253
Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District 1978 hydrology manual
Storm event (year) = 10.00 Antecedent Moisture Condition = 1 2 year, 1 hour precipitation = 0.455(In.)
100 year, 1 hour precipitation = 2.410(In.)
Storm event year = 10.0
Calculated rainfall intensity data:
1 hour intensity = 1.259(In/Hr)
Slope of intensity duration curve = 0.5700
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++
Process from Point/Station 100.000 to Point/Station
101.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 480.000(Ft.)
Top (of initial area) elevation = 356.000(Ft.)
Bottom (of initial area) elevation = 264.500(Ft.)
Difference in elevation = 91.500(Ft.)
Slope = 0.19062 s(percent)= 19.06
TC = k(0.378)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 6.222 min.
Rainfall intensity = 4.583(In/Hr) for a 10.0 year storm 2132
USER INPUT of soil data for subarea
Runoff Coefficient = 0.710
Decimal fraction soil group A = 0.730
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.270
RI index for soil(AMC 1) = 0.00
Pervious area fraction = 0.410; Impervious fraction = 0.590 Initial subarea runoff = 12.364(CFS)
Total initial stream area 3.800(Ac.)
Pervious area fraction = 0.410
End of computations, total study area = 3.80 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
Area averaged pervious area fraction(Ap) = 0.410
Area averaged RI index number = 0.0
2133
Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2005 Version Rational Hydrology Study Date: 03/20/25
File: SOUTHEXISTING2YEAR.out
7.1 SOUTH EXISTING 2 YEAR DISCHARGE
*********
Hydrology Study Control Information **********
English (in -lb) Units used in input data file
Program License Serial Number 6253
Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District 1978 hydrology manual
Storm event (year) = 2.00 Antecedent Moisture Condition = 1 2 year, 1 hour precipitation = 0.455(In.)
100 year, 1 hour precipitation = 2.410(In.)
Storm event year = 2.0
Calculated rainfall intensity data:
1 hour intensity = 0.455(In/Hr)
Slope of intensity duration curve = 0.5700
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++
Process from Point/Station 200.000 to Point/Station
201.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 320.000(Ft.)
Top (of initial area) elevation = 329.000(Ft.)
Bottom (of initial area) elevation = 267.000(Ft.)
Difference in elevation = 62.000(Ft.)
Slope = 0.19375 s(percent)= 19.38
TC = k(3.290)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 45.899 min.
Rainfall intensity = 0.530(In/Hr) for a 2.0 year storm
2134
USER INPUT of soil data for subarea
Runoff Coefficient = 0.350
Decimal fraction soil group A = 0.620
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.380
RI index for soil(AMC 1) = 0.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 0.228(CFS)
Total initial stream area 1.230(Ac.)
Pervious area fraction = 1.000
End of computations, total study area = 1.23 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
Area averaged pervious area fraction(Ap) = 1.000
Area averaged RI index number = 0.0
2135
Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2005 Version Rational Hydrology Study Date: 03/20/25
File: SOUTHEXISTINGI0YEAR.out
7.1 SOUTH EXISTING 10 YEAR DISCHARGE
*********
Hydrology Study Control Information **********
English (in -lb) Units used in input data file
Program License Serial Number 6253
Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District 1978 hydrology manual
Storm event (year) = 10.00 Antecedent Moisture Condition = 1 2 year, 1 hour precipitation = 0.455(In.)
100 year, 1 hour precipitation = 2.410(In.)
Storm event year = 10.0
Calculated rainfall intensity data:
1 hour intensity = 1.259(In/Hr)
Slope of intensity duration curve = 0.5700
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++
Process from Point/Station 200.000 to Point/Station
201.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 320.000(Ft.)
Top (of initial area) elevation = 329.000(Ft.)
Bottom (of initial area) elevation = 267.000(Ft.)
Difference in elevation = 62.000(Ft.)
Slope = 0.19375 s(percent)= 19.38
TC = k(3.290)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 45.899 min.
Rainfall intensity = 1.467(In/Hr) for a 10.0 year storm 2136
USER INPUT of soil data for subarea
Runoff Coefficient = 0.350
Decimal fraction soil group A = 0.620
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.380
RI index for soil(AMC 1) = 0.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 Initial subarea runoff = 0.632(CFS)
Total initial stream area 1.230(Ac.)
Pervious area fraction = 1.000
End of computations, total study area = 1.23 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
Area averaged pervious area fraction(Ap) = 1.000
Area averaged RI index number = 0.0
2137
Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2005 Version Rational Hydrology Study Date: 03/20/25
File: SOUTHPROPOSED2YEAR.out
7.1 SOUTH PROPOSED 2 YEAR DISCHARGE
*********
Hydrology Study Control Information **********
English (in -lb) Units used in input data file
Program License Serial Number 6253
Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District 1978 hydrology manual
Storm event (year) = 2.00 Antecedent Moisture Condition = 1 2 year, 1 hour precipitation = 0.455(In.)
100 year, 1 hour precipitation = 2.410(In.)
Storm event year = 2.0
Calculated rainfall intensity data:
1 hour intensity = 0.455(In/Hr)
Slope of intensity duration curve = 0.5700
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++
Process from Point/Station 200.000 to Point/Station
201.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 315.000(Ft.)
Top (of initial area) elevation = 329.000(Ft.)
Bottom (of initial area) elevation = 267.000(Ft.)
Difference in elevation = 62.000(Ft.)
Slope = 0.19683 s(percent)= 19.68
TC = k(0.450)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 6.219 min.
Rainfall intensity = 1.656(In/Hr) for a 2.0 year storm
2138
USER INPUT of soil data for subarea
Runoff Coefficient = 0.530
Decimal fraction soil group A = 0.620
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.380
RI index for soil(AMC 1) = 0.00
Pervious area fraction = 0.700; Impervious fraction = 0.300 Initial subarea runoff = 1.080(CFS)
Total initial stream area 1.230(Ac.)
Pervious area fraction = 0.700
End of computations, total study area = 1.23 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
Area averaged pervious area fraction(Ap) = 0.700
Area averaged RI index number = 0.0
2139
Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2005 Version Rational Hydrology Study Date: 03/20/25
File: SOUTHPROPOSED10YEAR.out
7.1 SOUTH PROPOSED 10 YEAR DISCHARGE
*********
Hydrology Study Control Information **********
English (in -lb) Units used in input data file
Program License Serial Number 6253
Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District 1978 hydrology manual
Storm event (year) = 10.00 Antecedent Moisture Condition = 1 2 year, 1 hour precipitation = 0.455(In.)
100 year, 1 hour precipitation = 2.410(In.)
Storm event year = 10.0
Calculated rainfall intensity data:
1 hour intensity = 1.259(In/Hr)
Slope of intensity duration curve = 0.5700
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++
Process from Point/Station 200.000 to Point/Station
201.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 315.000(Ft.)
Top (of initial area) elevation = 329.000(Ft.)
Bottom (of initial area) elevation = 267.000(Ft.)
Difference in elevation = 62.000(Ft.)
Slope = 0.19683 s(percent)= 19.68
TC = k(0.450)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 6.219 min.
Rainfall intensity = 4.584(In/Hr) for a 10.0 year storm 2140
USER INPUT of soil data for subarea
Runoff Coefficient = 0.530
Decimal fraction soil group A = 0.620
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.380
RI index for soil(AMC 1) = 0.00
Pervious area fraction = 0.700; Impervious fraction = 0.300 Initial subarea runoff = 2.988(CFS)
Total initial stream area 1.230(Ac.)
Pervious area fraction = 0.700
End of computations, total study area = 1.23 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
Area averaged pervious area fraction(Ap) = 0.700
Area averaged RI index number = 0.0
2141
VI RUNOFF VELOCITY CALCULATIONS
2 YR DISCHARGE (Q)
10 YR DISCHARGE (Q)
(CFS) LEAVING SITE
(CFS) LEAVING SITE
SOUTH EXISTING
0.55 0.70
SOUTH PROPOSED
0 0
NORTH EXISTING
5.4 7.12
NORTH PROPOSED
0 7.01
2142
PL
S=0.0025
n=0.025
Q(2)=0.23 CFS , V(2)=0.55 FPS
Q(10)=0.63 CFS , V(10)=0.70 FPS
30 `EXISTING PERIMETER WALL
0 1 I I I I 1 1 f
I i i � � I 1 1 1 1 1' 1 1 1 I ► I I I I I I I
EXISTING PARKING SOUTH
OUTFLOW PATH SECTION
I I I I I I II i tI
III IIIIII
2143
EXISTING SOUTH 2 YEAR FLOW
The open channel flow calculator
Select Channel Type:
Triangle v
Depth from Q
v
Channel slope:
ft/ft
0.0025
Flow velocity' 0.552442
ft/s
Flow dischargel0.23
ft^3/s
Calculate!
Specific energy)0.17
ft
Critical depth
ft
0.11 T TY
b
Rectangle
7 --r
‘1\--j_,..
b /71
z2
Trapezoid
zl z2
Triangle
NTH
9 Circle
Select unit system: Feet(ft) v
Water depth(y):
0.17 ft
LeftSlope (zi):
30 to 1 (H:V)
RightSlope (z2):
0 to 1 (H:V)
Input n value
0.025
or select n
Status:
Calculation finished
Flow areal0.42
IftA2
Froude number
0.34 Critical slope
0.02 1 ft/ft
Reset
Flow status
Subcritical flow
Velocity headl0
ft
Copyright 2007 (updated) by Dr. Xing Fang ([email protected]), Department of Civil and Environmental Engineering, Auburn University, Alabama, USA.
2144
EXISTING SOUTH 10 YEAR FLOW
The open channel flow calculator
Select Channel Type:
Triangle v
Depth from Q
v
Channel slope:
ft/ft
0.0025
Flow velocityl0.699708
ft/s
Flow discharge10.63
ft^3/s
Calculate!
Specific energyl0.25
ft
Critical depth
ft
0.16 T TY
b_i
Rectangle
7 --r
‘1\--j_,..
b z2
Trapezoid
II z2
Triangle
NTH
9 Circle
Select unit system: Feet(ft) v
Water depth(y):
0.24 ft
LeftSlope (zi):
30 to 1 (H:V)
RightSlope (z2):
0 to 1 (H:V)
Input n value
0.025
or select n
Status:
Calculation finished
Flow areal0.9
IftA2
Froude number
0.35 Critical slope
0.0218
1 ft/ft
Reset
Flow status
Subcritical flow
Velocity headl0.01
ft
Copyright 2007 (updated) by Dr. Xing Fang ([email protected]), Department of Civil and Environmental Engineering, Auburn University, Alabama, USA.
2145
EXISTING - NORTH 2 YEAR FLOW
The open channel flow calculator
Select Channel Type:
Circle
Depth from Q
v
Channel slope:
ft/ft
0.01 Flow velocity' 5.398
ft/s
Flow discharge' 3.88
ft^3/s
Calculate!
Specific energy)1.02
ft
Critical depth
ft
0.69 T TY
b_i
Rectangle
7 --r
z1 b z2
T rapezoid
II z2
Triangle
NTH
9 Circle
Select unit system: Feet(ft) v
Water depth(y):
0.56 ft
LeftSlope (zi):
to 1 (H:V)
RightSlope (z2):
to 1 (H:V)
Input n value
0.013
or select n
Status:
Calculation finished
Flow areaj0.73
IftA2
Froude number
1.5 Critical slope
0.0045
1 ft/ft
Reset
Top width(T)
ft
1.8 Flow status
Supercritical flow
Velocity head 0.45
ft
Copyright 2007 (updated) by Dr. Xing Fang ([email protected]), Department of Civil and Environmental Engineering, Auburn University, Alabama, USA.
2146
EXISTING NORTH 10 YEAR FLOW
The open channel flow calculator
Select Channel Type:
Circle
Depth from Q
v
Channel slope:
ft/ft
0.01 rFlow velocity) 7.108
ft/s
Flow dischargel10.73
ft^3/s
LCalculate!
Wetted perimeter
ft
3.08 Specific energy)1.75
ft
Critical depth
ft
1.18 T TY
b
Rectangle
-7 -
.77 Als
Z 1 b z2
Trapezoid
z1 z2
Triangle
T-
r L r D
Circle
e
Select unit system: Feet(ft) v
Water depth(y):
0.97 Ift
LeftSlope (zi):
to 1 (H:V)
RightSlope (z2):
to 1 (H:V)
Input n value
0.013
or select n
clean,uncoated castiron:0.014
V
Status:
Calculation finished
Flow area
1.51 IftA2
Froude number
1.44 Critical slope
0.0053 Ift/ft
Reset
Top width(T)
ft
2 Flow status
Supercritical flow
Velocity headj0.78
ft
Copyright 2007 (updated) by Dr. Xing Fang ([email protected]), Department of Civil and Environmental Engineering, Auburn University, Alabama, USA.
2147
DEVELOPED NORTH 10 YEAR FLOW
The open channel flow calculator
Select Channel Type:
Circle
Depth from Q
v
Channel slope:
ft/ft
0.01 rFlow velocity) 7.012
ft/s
Flow dischargel10.13
ft^3/s
LCalculate!
Wetted perimeter
ft
3.02 Specific energyl1.7
ft
Critical depth
ft
1.14 T TY
b
Rectangle
�7 -I
z1 b z2
Trapezoid
z1 z2
Triangle
T-
r L r 1 D
Circle
Select unit system: Feet(ft) v
Water depth(y):
0.94 Ift
LeftSlope (zi):
to 1 (H:V)
RightSlope (z2):
to 1 (H:V)
Input n value
0.013
or select n
clean,uncoated castiron:0.014
V
Status:
Calculation finished
Flow areal1.45
IftA2
Froude number
1.45 Critical slope
0.0052
Ift/ft
Reset
Top width(T)
ft
2 Flow status
Supercritical flow
Velocity headj0.76
ft
Copyright 2007 (updated) by Dr. Xing Fang ([email protected]), Department of Civil and Environmental Engineering, Auburn University, Alabama, USA.
2148
VII APPENDIX
2149
FRANK SINATRA DR
-4
__.,
SITE
o
Q
(f)
CD
Z
z
c
0 BOB HOPE DR
N
COUNTRY CLUB DR
VICINITY MAP
NOT TO SCALE
2150
WORLD WILDLIFE MUSEUM
PRELIMINARY WOMP PLAN - EXISTING CONDITION
/ 1 , ( EXISTING STORM DRAIN
I�
APN: 689-040-017
EXISTING CURB INLET CATCH BASIN
(TO BE REMOVED AND REPLACED)
264.54TC
263.71 TG
OUTFLOW (VIA STORM DRAIN) I
EXISTING PARCEL LINE
APN: 689-040-027
(oFF-sITE)
r it
i
APN: 689-040-025
�.w
1 \,
4 I
4 [EXISTING CENTERLINE
[EXISTING RAISED MEDIAN
APN: 689-040-023
1 S- EXISTING PARKING LOT
J
((
Ok
.1 tr,l
I � L.?
HIGHWAY 111
(EXISTING)
GRAPHIC SCALE
SCALE 1"=30'
NORTH
AREA=3.80AC
L(L)=436FT
UPSTREAM ELEV=356FT
DOWNSTREAM ELEV=264.5FT
FRACTION SOIL TYPE A=0.73
FRACTION SOIL TYPE D=0.27
RUNOFF COEFFICIENT (C)=0.62
2 YR.-24 HR. FLOWRATE=3.88CFS
10 YR.-24 HR. FLOWRATE=10.73CFS
l.
(4
SOUTH
AREA=1.23AC
L(L)=320FT
UPSTREAM ELEV=329FT
DOWNSTREAM ELEV=267FT
FRACTION SOIL TYPE A=0.62
FRACTION SOIL TYPE D=0.38
RUNOFF COEFFICIENT (C)=0.35
2 YR.-24 HR. FLOWRATE=0.23CFS
10 YR.-24 HR. FLOWRATE=0.63CFS
EXISTING PROPERTY LINE
EXISTING PARCEL LINE
PRECIPITATION
2 YR.-1 HR.=0.4551N
100 YR.-1 HR=2.411N
SLOPE OF INTENSITY=0.57
S=0.0025
n=0.025
Q(2)=0.23 CFS , V(2)=0.55 FPS
Q(10)=0.63 CFS , V(10)=0.70 FPS
1 PL
EXISTING PERIMETER WALL
30 -I-�IIEIII�IIII-�� -�� ��� iii Iii IiI III -I I I I I -IT -III -I I I I -I I I I I -III -III I I I -III I I I I I I -III -III I I I -III -III I I-� 1 I- APN: 689-040-028
cb
EXISTING RIGHT OF WAY LIN
[EXISTING RAISED MEDIAN
Iv y
L. l
0 10 20 30
60 90
120
y�
LEGEND
SUBAREA BOUNDARY
LONGEST LENGTH OF TRAVEL
PROPOSED EARTHEN SWALE
DIRECTIONAL FLOW ARROW
SECTION A -A
NOT TO SCALE
EXISTING PERIMETER WALL
\5'
I
SOUTH
(EXISTING)
EXISTING NATURAL
TERRAIN
rEXISTING CENTERLINE
i
APN: 689-041-001
HIGHWAY 111
(EXISTING)
loco
I
INTERSECTION: /
HIGHWAY 111 AND
MIRAGE COVE DRIVE
(NOT FOR CONSTRUCTION)
EXISTING CENTERLINE
w
cc
0 w;
>Z
O�
X
Uw
w
(.r
cc
The
G Group
44-600 Village Court, Suite 100
Palm Desert, CA 92260
t.760.346.4750 f. 760.340.0089
TheAltumGroup.com
CITY OF PALM DESERT, CALIFORNIA
PRELIMINARY WOMP PLAN - EXISTING
WORLD WILDLIFE MUSEUM
SHEET
1 OF
ENGINEERING I PLANNING I SURVEY I ENVIRONMENTAL
FOR:
1 2151
WORLD WILDLIFE MUSEUM
PRELIMINARY WQMP PLAN - DEVELOPED CONDITION
11 f
ri;_
SD
L _ _
I
7 EXISTING PROPERTY LINE
APN: 689-040-017
EXISTING CURB INLET CATCH BASIN
(TO BE REMOVED AND REPLACED)
EXISTING STORM DRAIN
_
LI
5U
OVERFLOW PATH
(VIA STORM DRAIN) 260.80FL
EXISTING
OVERFLOW
OUTLET
PROPOSED PRINSCO
HYDROSTOR CHAMBER
VOLUME REQUIRED=2,127 CU.FT.
VOLUME PROVIDED=2,439 CU.FT.
EXISTING PARCEL LINE
4-4, I
i
APN: 689-040-027
(OFF -SITE)
EXISTING A.C. PAVEMENT
APN: 689-040-025
4 264.54TC
263.71 TG
259.80FL
OUTLET
*4.'0
272.00FF
EXISTING PARCEL LINE
PROPOSED DETENTION BASIN
VOLUME REQUIRED = 402 CU.FT.
VOLUME PROVIDED = 1524 CU.FT.
S- PROPOSED A.C. PAVEMENT
APN: 689-044=6 �
[EXISTING CENTERLINE
PROPOSED MUSEUM
274.00FF /
(NORTH)
_61,6
EXISTING RIGHT OF WAY LINE
(EXISTING RAISED MEDIAN
1 )
y
Uuui
nnci
HIGHWAY 111
(EXISTING)
GRAPHIC SCALE
SCALE 1"=30'
0 10 20 30
60 90
120
r
NORTH
DESIGN CAPTURE VOLUME (DCV) AREA=3.80AC
ON -SITE TRIBUTARY AREA = 3.14 AC
L(L)=480FT
UPSTREAM ELEV=356FT
DOWNSTREAM ELEV=264.5FT
FRACTION SOIL TYPE A=0.73
FRACTION SOIL TYPE D=0.27
RUNOFF COEFFICIENT (C)=0.71
2 YR.-24 HR. FLOWRATE=4.47CFS
10 YR.-24 HR. FLOWRATE=12.36CFS
V(BMP) REQUIRED=2069CU.FT.
V PROVIDED=2116CU.FT.
L
.(277,5) _
LEGEND
EXISTING PROPERTY LINE
y
SUBAREA BOUNDARY
LONGEST LENGTH OF TRAVEL
PROPOSED EARTHEN SWALE
PROPOSED A.C. PAVEMENT
DIRECTIONAL FLOW ARROW
The
G Group
SOUTH
AREA=1.23AC
L(L)=315FT
UPSTREAM ELEV=329FT
DOWNSTREAM ELEV=267FT
FRACTION SOIL TYPE A=0.62
FRACTION SOIL TYPE D=0.38
RUNOFF COEFFICIENT (C)=0.53
2 YR.-24 HR. FLOWRATE=1.08CFS
10 YR.-24 HR. FLOWRATE=2.99CFS
V(BMP) REQUIRED=402CU.FT.
V PROVIDED=1524CU.FT.
XISTING PARCEL LIN
PRECIPITATION
2 YR.-1 HR.=0.4551N
100 YR.-1 HR=2.41IN
SLOPE OF INTENSITY=0.57
APN: 689-041-001
U(� f
PROPOSED MUSEUM PARKING
//
(SOUTH)
EXISTING RIGHT OF WAY LINE
[EXISTING RAISED MEDIAN
44-600 Village Court, Suite 100
Palm Desert, CA 92260
t.760.346.4750 f. 760.340.0089
TheAltumGroup.com
ENGINEERING I PLANNING I SURVEY I ENVIRONMENTAL
EXISTING CENTERLINE
HIGHWAY 111
(EXISTING)
000
bOO
771
INTERSECTION: /
HIGHWAY 111 AND
MIRAGE COVE DRIVE
(NOT FOR CONSTRUCTION)
CITY OF PALM DESERT, CALIFORNIA
PRELIMINARY WOMP PLAN - DEVELOPED
WORLD WILDLIFE MUSEUM
SHEET
2152
NOAA Atlas 14, Volume 6, Version 2
Location name: Rancho Mirage, California, USA*
Latitude: 33.766°, Longitude: -116.443°
Elevation: 274 ft**
* source: ESRI Maps
** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, Sandra Pavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, Geoffrey Bonnin, Daniel Brewer, Li-Chuan Chen, Tye Parzybok, John Yarchoan NOAH, National Weather Service, Silver Spring, Maryland PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Duration
5 -min
10 -min
15 -min
30 -min
60 -min
2 -hr
3 -hr
6 -hr
12 -hr
24 -hr
2 -day
3 -day
4 -day
7 -day
10 -day
20 -day
30 -day
45 -day
60 -day
Average recurrence interval (years)
1 0.072
(0.060-0.087)
0.103
(0.086-0.124)
0.124
(0.104-0.150)
0.202
(0.169-0.245)
0.279
(0.233-0.338)
0.374
(0.312-0.453)
0.443
(0.369-0.536)
0.593
(0.494-0.718)
0.733
(0.611-0.888)
0.867
(0.768-1.00)
0.996
(0.882-1.15)
1.06 (0.937-1.22)
1.09 (0.966-1.26)
1.19 (1.05-1.37)
1.26 (1.11-1.45)
1.38 (1.22-1.60)
1.55 (1.37-1.79)
1.70 (1.51-1.97)
1.83 (1.62-2.11)
2 0.117
(0.097-0.142)
0.168
(0.140-0.203)
0.203
(0.169-0.246)
0.330
(0.275-0.400)
0.455
(0.379-0.552)
0.611
(0.509-0.741)
0.721
(0.601-0.875)
0.953
(0.794-1.16)
1.16 (0.969-1.41)
1.36 (1.20-1.57)
1.54 (1.36-1.78)
1.63 (1.44-1.88)
1.67 (1.48-1.93)
1.82 (1.61-2.10)
1.93 (1.70-2.22)
2.14 (1.89-2.47)
2.42 (2.14-2.79)
2.69 (2.38-3.10)
2.91 (2.58-3.36)
5 0.190
(0.157-0.231)
0.272
(0.226-0.330)
0.329
(0.273-0.400)
0.535
(0.444-0.650)
0.738
(0.613-0.898)
0.969
(0.805-1.18)
1.13 (0.940-1.38)
1.47 (1.22-1.79)
1.77 (1.47-2.15)
2.06 (1.81-2.38)
2.32 (2.04-2.68)
2.44 (2.15-2.83)
2.51 (2.21-2.90)
2.73 (2.40-3.16)
2.89 (2.55-3.34)
3.23 (2.85-3.74)
3.68 (3.24-4.26)
4.12 (3.64-4.77)
4.50 (3.97-5.22)
10 0.260
(0.214-0.319)
0.373
(0.307-0.458)
0.451
(0.372-0.553)
0.734
(0.605-0.900)
1.01 (0.835-1.24)
1.30 (1.07-1.60)
1.50 (1.24-1.84)
1.93 (1.59-2.36)
2.30 (1.90-2.82)
2.66 (2.33-3.10)
2.99 (2.62-3.49)
3.16 (2.76-3.68)
3.24 (2.84-3.78)
3.52 (3.08-4.11)
3.74 (3.27-4.36)
4.20 (3.67-4.90)
4.80 (4.20-5.61)
5.41 (4.73-6.32)
5.94 (5.20-6.93)
25 0.378
(0.301-0.479)
0.541
(0.431-0.687)
0.655
(0.521-0.831)
1.06 (0.848-1.35)
1.47 (1.17-1.87)
1.82 (1.45-2.31)
2.07 (1.65-2.62)
2.60 (2.07-3.30)
3.08 (2.45-3.91)
3.54 (3.00-4.26)
3.98 (3.37-4.80)
4.21 (3.57-5.07)
4.33 (3.67-5.22)
4.71 (3.99-5.67)
5.00 (4.24-6.02)
5.65 (4.78-6.80)
6.49 (5.50-7.82)
7.36 (6.24-8.86)
8.12 (6.88-9.77)
50 0.488
(0.380-0.632)
0.699
(0.544-0.906)
0.845
(0.658-1.10)
1.38 (1.07-1.78)
1.90 (1.48-2.46)
2.28 (1.77-2.95)
2.56 (1.99-3.31)
3.17 (2.47-4.11)
3.72 (2.90-4.83)
4.27 (3.54-5.24)
4.80 (3.99-5.90)
5.09 (4.23-6.26)
5.24 (4.35-6.44)
5.70 (4.73-7.00)
6.06 (5.03-7.44)
6.86 (5.70-8.44)
7.92 (6.57-9.73)
9.02 (7.48-11.1)
9.98 (8.28-12.3)
100
0.620
(0.471-0.824)
0.888
(0.675-1.18)
1.07 (0.816-1.43)
1.75 (1.33-2.32)
2.41 (1.83-3.21)
2.80 (2.13-3.72)
3.10 (2.36-4.12)
3.79 (2.88-5.04)
4.42 (3.36-5.88)
5.05 (4.10-6.36)
5.69 (4.62-7.16)
6.05 (4.91-7.62)
6.24 (5.06-7.85)
6.78 (5.50-8.54)
7.21 (5.84-9.07)
8.20 (6.65-10.3)
9.48 (7.69-11.9)
10.8 (8.79-13.6)
12.0 (9.76-15.1)
200
0.800
(0.590-1.09)
1.15 (0.846-1.57)
1.39 (1.02-1.90)
2.26 (1.66-3.09)
3.12 (2.30-4.26)
3.40 (2.51-4.66)
3.72 (2.75-5.09)
4.48 (3.31-6.14)
5.19 (3.83-7.10)
5.91 (4.66-7.64)
6.67 (5.26-8.62)
7.11 (5.62-9.20)
7.34 (5.80-9.49)
7.98 (6.30-10.3)
8.48 (6.70-11.0)
9.68 (7.64-12.5)
11.2 (8.86-14.5)
12.9 (10.2-16.7)
14.3 (11.3-18.5)
500
1.27 (0.901-1.82)
1.83 (1.29-2.61)
2.21 (1.56-3.15)
3.59 (2.54-5.13)
4.96 (3.51-7.08)
5.01 (3.55-7.15)
5.06 (3.58-7.22)
5.51 (3.90-7.86)
6.31 (4.46-9.00)
7.16 (5.43-9.63)
8.09 (6.14-10.9)
8.67 (6.58-11.7)
8.97 (6.80-12.1)
9.76 (7.40-13.1)
10.4 (7.86-14.0)
11.9 (9.00-16.0)
13.8 (10.5-18.6)
15.9 (12.1-21.4)
17.8 (13.5-24.0)
1000
1.81 (1.24-2.68)
2.60 (1.78-3.84)
3.14 (2.15-4.65)
5.12 (3.49-7.56)
7.06 (4.83-10.4)
7.14 (4.87-10.6)
7.21 (4.92-10.7)
7.28 (4.97-10.8)
7.35 (5.02-10.9)
8.20 (6.02-11.4)
9.28 (6.81-12.9)
9.99 (7.33-13.9)
10.4 (7.59-14.4)
11.3 (8.25-15.7)
12.0 (8.77-16.6)
13.7 (10.1-19.1)
16.0 (11.7-22.3)
18.5 (13.6-25.8)
20.8 (15.2-28.9)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAAAtlas 14 document for more information.
Back to Top
PF graphical
2153
RUNOFF INDEX NUMBERS OF HYDROLOGIC SOIL -COVER COMPLEXES FOR PERVIOUS AREAS -AMC II Cover Type (3)
Quality of
Cover (2)
Soil Group
A
B
C
D
NATURAL COVERS -
Poor
78 53
86 70
91 80
93 85
Barren
(Rockland, eroded and graded land)
Chaparrel, Broadleaf
(Manzonita, ceanothus and scrub oak)
Fair
40 63
75 81
Good
31 57
71 78
Chaparrel, Narrowleaf
Poor
71 82
88 91
(Chamise and redshank)
Fair
55 72
81 86
Grass, Annual or Perennial
Poor
67 78
86 89
Fair
50 69
79 84
Good
38 61
74 80
Meadows or Cienegas
Poor
63 77
85 88
(Areas with seasonally high water table,
Fair
51 70
80 84
principal vegetation is sod forming grass)
Good
30 58
72 78
Open Brush
Poor
62 76
84 88
(Soft wood shrubs - buckwheat, sage, etc.)
Fair
46 66
77 83
Good
41 63
75 81
Woodland
Poor
45 66
77 83
(Coniferous or broadleaf trees predominate.
Fair
36 60
73 79
Canopy density is at least 50 percent)
Good
28 55
70 77
Woodland, Grass
Poor
57 73
82 86
(Coniferous or broadleaf trees with canopy
Fair
44 65
77 82
density from 20 to 50 percent)
Good
33 58
72 79
URBAN COVERS -
Good
Poor
32 58
56 74
69 83
75 87
Residential or Commercial Landscaping
(Lawn, shrubs, etc.)
Turf
(Irrigated and mowed grass)
Fair
44 65
77 82
Good
33 58
72 79
AGRICULTURAL COVERS -
76 85
90 92
Fallow
(Land plowed but not tilled or seeded)
R C F C & W C D
�J'
HYDROLOGY MANUAL
RUNOFF INDEX NUMBERS
FOR
PERVIOUS AREA
2154
PLATE D-5.5 (I of 2)
et
GA OSLIBNTI
,0•III kEOEb YATI ON
f. 0,A C LIB000
24 CO "ROE Q
I ro{w
(RAMCHO MIRAGE)
CA A
EVEN PAL MG. VAL LEY)
CODA CA1.1 -NTE
14 INDIAN RE50,I TION
(I
A000 OALIONT6
9 22
INDIAN RESERVATION
22�
30. NNIAIIN P6ff E6 VA'WN
flier —, do, ISO
LEGEND
- SOILS GROUP BOUNDARY
A SOILS GROUP DESIGNATION
RCFCBIWCD
HYDROLOGY MANUAL
-
0 FEET 25000
1 0000'LALIO � 6
24 10010,1 R000RVATIa
4.49'
HYDROLOGIC SOILS GROUP MAP
FOR
CATHEDRAL CITY
Y
6 b
PLATE C--1.36
GLOBAL WILDLIFE DISCOVERY MUSEUM
Initial Study/Mitigated Negative Declaration
August 2025
Appendix H
Noise and Vibration Analysis
City of Rancho Mirage H
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HOWARD WORLD WILDLIFE
MUSEUM
NOISE AND VIBRATION ANALYSIS
Prepared By:
Bill Lawson I [email protected]
Reference Number
16391-02 NA
Agency
City of Rancho Mirage
Date
May 5, 2025
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TABLE OF CONTENTS
EXECUTIVE SUMMARY 2
1 INTRODUCTION 4
1.1 Site Location 4
1.2 Project Description 4
2 FUNDAMENTALS 8
2.1 Range of Noise 8
2.2 Noise Descriptors 9
2.3 Sound Propagation 9
2.4 Noise Control 10
2.5 Noise Barrier Attenuation 10
2.6 Land Use Compatibility With Noise 10
2.7 Community Response to Noise 11
2.8 Vibration 11
3 REGULATORY SETTING 14
3.1 State of California Noise Requirements 14
3.2 City of Rancho Mirage General Plan Noise Element 14
3.3 Operational Noise Standards 15
3.4 Construction Noise Standards 17
3.5 Vibration Standards 18
4 SIGNIFICANCE CRITERIA 20
4.1 Noise Level Increases (Threshold A) 20
4.2 Vibration (Threshold B) 21
4.3 CEQA Guidelines Not Further Analyzed (Threshold C) 21
4.4 Significance Criteria Summary 22
5 EXISTING NOISE LEVEL MEASUREMENTS 24
5.1 Measurement Procedure and Criteria 24
5.2 Noise Measurement Locations 24
5.3 Noise Measurement Results 26
6 RECEIVER LOCATIONS 28
7 OPERATIONAL NOISE ANALYSIS 30
7.1 Operational Noise Sources 30
7.2 Reference Noise Levels 30
7.3 CadnaA Noise Prediction Model 33
7.4 Project Operational Noise Levels 33
7.5 Project Operational Noise Level Compliance 35
7.6 Project Operational Noise Level Increases 35
7.7 Off -Site Traffic Noise Analysis 37
8 CONSTRUCTION IMPACTS 38
8.1 Construction Noise Levels 38
8.2 Construction Reference Noise Levels 38
8.3 Construction Noise Analysis 40
8.4 Project Site Construction Noise Level Compliance 41
8.5 Temporary Construction Noise Level Increases 42
8.6 Construction Vibration Analysis 42
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9 REFERENCES 44
10 CERTIFICATION 46
APPENDICES
APPENDIX 3.1:
APPENDIX 5.1:
APPENDIX 5.2:
APPENDIX 7.1:
APPENDIX 8.1:
APPENDIX 8.2:
CITY OF RANCHO MIRAGE MUNICIPAL CODE
STUDY AREA PHOTOS
NOISE LEVEL MEASUREMENT WORKSHEETS
CADNAA OPERATIONAL NOISE CALCULATIONS
CONSTRUCTION NOISE CALCULATIONS
NIGHTTIME CONCRETE POUR NOISE CALCULATIONS
LIST OF EXHIBITS
EXHIBIT 1-1: PROJECT LOCATION 5
EXHIBIT 1-2: PRELIMINARY SITE PLAN 6
EXHIBIT 2-1: TYPICAL NOISE LEVELS 8
EXHIBIT 2-2: NOISE LEVEL INCREASE PERCEPTION 11
EXHIBIT 2-3: TYPICAL LEVELS OF GROUND -BORNE VIBRATION 13 EXHIBIT3-A: NOISE LEVEL AND LAND USE COMPATIBILITY 16
EXHIBIT 5-1: NOISE MEASUREMENT LOCATIONS 25
EXHIBIT 6-1: RECEIVER LOCATIONS 29
EXHIBIT 7-1: OPERATIONAL NOISE SOURCE LOCATIONS 31
EXHIBIT 8-1: CONSTRUCTION NOISE SOURCE LOCATIONS 39
LIST OF TABLES
TABLE ES -1: SUMMARY OF CEQA SIGNIFICANCE FINDINGS 2
TABLE 3-1: OPERATIONAL NOISE STANDARDS 17
TABLE 4-1: SIGNIFICANCE CRITERIA SUMMARY 22
TABLE 5-1: AMBIENT NOISE LEVEL MEASUREMENTS 26
TABLE 7-1: REFERENCE NOISE LEVEL MEASUREMENTS 32
TABLE 7-2: DAYTIME PROJECT OPERATIONAL NOISE LEVELS 34
TABLE 7-3: EVENING PROJECT OPERATIONAL NOISE LEVELS 34
TABLE 7-4: NIGHTTIME PROJECT OPERATIONAL NOISE LEVELS 34 TABLE 7-5: OPERATIONAL NOISE LEVEL COMPLIANCE 35
TABLE 7-6: DAYTIME PROJECT OPERATIONAL NOISE LEVEL INCREASES 36 TABLE 7-7: EVENING OPERATIONAL NOISE LEVEL INCREASES 36 TABLE 7-8: NIGHTTIME OPERATIONAL NOISE LEVEL INCREASES 37 TABLE 8-1: CONSTRUCTION REFERENCE NOISE LEVELS 40
TABLE 8-2: CONSTRUCTION EQUIPMENT NOISE LEVEL SUMMARY 41 TABLE 8-3: CONSTRUCTION NOISE LEVEL COMPLIANCE 41
TABLE 8-4: DAYTIME CONSTRUCTION NOISE LEVEL INCREASES 42 TABLE 8-5: VIBRATION SOURCE LEVELS FOR CONSTRUCTION EQUIPMENT 43 TABLE 8-6: PROJECT CONSTRUCTION VIBRATION LEVELS 43
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LIST OF ABBREVIATED TERMS
(1) Reference
ANSI American National Standards Institute
CEQA California Environmental Quality Act
CNEL Community Noise Equivalent Level
dBA A -weighted decibels
EPA Environmental Protection Agency
FHWA Federal Highway Administration
FTA Federal Transit Administration
INCE Institute of Noise Control Engineering
Leg Equivalent continuous (average) sound level
Lmax Maximum level measured over the time interval
PPV Peak Particle Velocity
Project Howard World Wildlife Museum
RMMC Rancho Mirage Municipal Code
RMS Root -mean -square
VdB Vibration Decibels
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EXECUTIVE SUMMARY
Urban Crossroads, Inc. has prepared this noise study to determine the noise exposure and the necessary noise mitigation measures for the proposed Howard World Wildlife Museum (Project) in the City of Rancho Mirage. The Project consists of a 22,012 -square -foot natural history museum.
This noise study has been prepared to satisfy applicable City of Rancho Mirage noise standards and significance criteria based on Appendix G of the California Environmental Quality Act (CEQA) Guidelines. (1)
The results of this Noise and Vibration Analysis are summarized below based on the significance criteria in Section 4 of this report consistent with Appendix G of the CEQA Guidelines. (1) Table ES - 1 shows the findings of significance for each potential noise and/or vibration impacts under CEQA before and after any required mitigation measures.
TABLE ES -1: SUMMARY OF CEQA SIGNIFICANCE FINDINGS
Analysis
Report
Section
Significance Findings
Unmitigated
Mitigated
Operational Noise
7 8
8 Less Than Significant
-
Project Construction Noise
Less Than Significant
-
Construction Vibration
Less Than Significant
-
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1 INTRODUCTION
This Noise and Vibration Analysis has been completed to determine the noise impacts associated with the development of the proposed Howard World Wildlife Museum, (Project). This noise and vibration analysis briefly describes the Project, provides information regarding noise fundamentals, sets out the local regulatory setting, presents the study methods and procedures for noise analysis, evaluates the future exterior noise environment, potential off -site traffic impacts, the Project - related long-term stationary -source operational noise, and Project -related short-term construction noise and vibration impacts.
1.1 SITE LOCATION
The Project is located at the northeast corner of Highway 111 and Mirage Cove Drive in the City of Rancho Mirage as shown in Exhibit 1-1. The nearest existing noise -sensitive residential uses are located east of Project site within the Small Mountain Private Condominiums.
1.2 PROJECT DESCRIPTION
The Project proposes developing a 22,012 -square -foot natural history museum. The museum's design will integrate with the existing hillside terrain, aligning the building with the natural landscape. The Project is expected to operate during typical daytime work hours. The preliminary site plan is provided in Exhibit 1-2.
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EXHIBIT 1-1: PROJECT LOCATION
4 li:tLw l 3i�C-ri:1= I_.i t•.IJI J x,1 1: ( :.FI' I;� J.:IV-lai.rl'i'Ir Frank Sinatra Drive
II
4l
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a
Belmont
oAqueduct
rnaemar Drive
' 1
'� Site : 1 1 !;
1 V
Del Mar
lanloran
Saratoga
kor'i MirageNove Dove
+'o co"-
g,ra'e
of
a
n
P
Carla lane
De?err Cove Avenue
No r lc, en[i0
.9h Carta Lane
y L- BervaLane
111 ',Lane
ti
thunder Road
75 a
c
ank Sinatra Dove
Dr,v
i
4- Frafti Sun.
lonwerc.0
Bing Crosby Drive
0at�ta
a a Q
m
d OpenStreetMap (and) contributors, CC -BY -SA
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EXHIBIT 1-2: PRELIMINARY SITE PLAN
LEGEND:
[_] Site Boundary
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2 FUNDAMENTALS
Noise is simply defined as "unwanted sound." Sound becomes unwanted when it interferes with normal activities, when it causes actual physical harm, or when it has adverse effects on health.
Noise is measured on a logarithmic scale of sound pressure level known as a decibel (dB). A - weighted decibels (dBA) approximate the subjective response of the human ear to broad frequency noise source by discriminating against very low and very high frequencies of the audible spectrum.
They are adjusted to reflect only those frequencies which are audible to the human ear. Exhibit 2-1 presents a summary of the typical noise levels and their subjective loudness and effects that are described in more detail below.
EXHIBIT 2-1: TYPICAL NOISE LEVELS
COMMON OUTDOOR
ACTIVITIES
COMMON INDOOR
ACTIVITIES
A - WEIGHTED
SOUND LEVEL dBA
SUBJECTIVE
LOUDNESS
EFFECTS OF
NOISE
THRESHOLD OF PAIN
140
INTOLERABLE OR
DEAFENING
HEARING LOSS
illi
NEAR JET ENGINE
130
120
JET FLY -OVER AT 300m (1000 ft)
ROCK BAND
110 ilk
LOUD AUTO HORN
100
VERY NOISY
GAS LAWN MOWER AT 1m (3 ft)
90 DIESEL TRUCK AT 15m (50 ft),
at 80 km/hr (50 mph)
FOOD BLENDER AT 1m (3 ft)
80 SPEECH
INTERFERENCE
NOISY URBAN AREA, DAYTIME
VACUUM CLEANER AT 3m (10 ft)
70 LOUD
HEAVY TRAFFIC AT 90m (300 ft)
NORMAL SPEECH AT 1m (3 ft)
60 QUIET URBAN DAYTIME
LARGE BUSINESS OFFICE
50 MODERATE
SLEEP
DISTURBANCE
QUIET URBAN NIGHTTIME
THEATER, LARGE CONFERENCE
ROOM (BACKGROUND)
40 QUIET SUBURBAN NIGHTTIME
LIBRARY
30 FAINT
NO EFFECT
QUIET RURAL NIGHTTIME
BEDROOM AT NIGHT, CONCERT
HALL (BACKGROUND)
20 BROADCAST/RECORDING
STUDIO
10 VERY FAINT
LOWEST THRESHOLD OF HUMAN
HEARING
LOWEST THRESHOLD OF HUMAN
HEARING
0 Source: Environmental Protection Agency Office of Noise Abatement and Control, Information on Levels of Environmental Noise Requisite to Protect Public Health and Welfare with an Adequate Margin of Safety (EPA/ONAC 550/9-74-004) March 1974.
2.1 RANGE OF NOISE
Since the range of intensities that the human ear can detect is so large, the scale frequently used to measure intensity is a scale based on multiples of 10, the logarithmic scale. The scale for measuring intensity is the decibel scale. Each interval of 10 decibels indicates a sound energy ten times greater than before, which is perceived by the human ear as being roughly twice as loud. (2) The most common sounds vary between 40 dBA (very quiet) to 100 dBA (very loud). Normal conversation at three feet is roughly at 60 dBA, while loud jet engine noises equate to 110 dBA at approximately 1,000 feet, which can cause serious discomfort. (3) Another important aspect of noise is the duration of the sound and the way it is described and distributed in time. 16391-02 NA
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2.2 NOISE DESCRIPTORS
Environmental noise descriptors are generally based on averages, rather than instantaneous, noise levels. The most used metric is the equivalent level (Leq). Equivalent sound levels are not measured directly but are calculated from sound pressure levels typically measured in A -weighted decibels (dBA). The equivalent sound level (Leq) represents a steady state sound level containing the same total energy as a time varying signal over a given sample period and is commonly used to describe the "average" noise levels within the environment.
Peak hour or average noise levels, while useful, do not completely describe a given noise environment. Noise levels lower than peak hour may be disturbing if they occur during times when quiet is most desirable, namely evening and nighttime (sleeping) hours. To account for this, the Community Noise Equivalent Level (CNEL), representing a composite 24 -hour noise level is utilized.
The CNEL is the weighted average of the intensity of a sound, with corrections for time of day, and averaged over 24 hours. The time -of -day corrections require the addition of 5 decibels to dBA Leq sound levels in the evening from 7:00 p.m. to 10:00 p.m., and the addition of 10 decibels to dBA Leq sound levels at night between 10:00 p.m. and 7:00 a.m. These additions are made to account for the noise sensitive time periods during the evening and night hours when noise can become more intrusive. CNEL does not represent the actual sound level heard at any time, but rather represents the total sound exposure. The City of Rancho Mirage relies on the 24 -hour CNEL level to assess land use compatibility with transportation related noise sources.
2.3 SOUND PROPAGATION
When sound propagates over a distance, it changes in level and frequency content. The way noise reduces with distance depends on the following factors.
2.3.1 Geometric Spreading
Sound from a localized source (i.e., a stationary point source) propagates uniformly outward in a spherical pattern. The sound level attenuates (or decreases) at a rate of 6 dB for each doubling of distance from a point source. Highways consist of several localized noise sources on a defined path and hence can be treated as a line source, which approximates the effect of several point sources.
Noise from a line source propagates outward in a cylindrical pattern, often referred to as cylindrical spreading. Sound levels attenuate at a rate of 3 dB for each doubling of distance from a line source. (2)
2.3.2 Ground Absorption
The propagation path of noise from a highway to a receiver is usually very close to the ground. Noise attenuation from ground absorption and reflective wave canceling adds to the attenuation associated with geometric spreading. Traditionally, the excess attenuation has also been expressed in terms of attenuation per doubling of distance. This approximation is usually sufficiently accurate for distances of less than 200 ft. For acoustically hard sites (i.e., sites with a reflective surface between the source and the receiver, such as a parking lot or body of water), no excess ground attenuation is assumed. For acoustically absorptive or soft sites (i.e., those sites with an absorptive ground surface between the source and the receiver such as soft dirt, grass, or scattered bushes and trees), an excess ground attenuation value of 1.5 dB per doubling of distance is normally assumed. 16391-02 NA
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When added to the cylindrical spreading, the excess ground attenuation results in an overall drop- off rate of 4.5 dB per doubling of distance from a line source. (4)
2.3.3 Atmospheric Effects
Receivers located downwind from a source can be exposed to increased noise levels relative to calm conditions, whereas locations upwind can have lowered noise levels. Sound levels can be increased at large distances (e.g., more than 500 feet) due to atmospheric temperature inversion (i.e., increasing temperature with elevation). Other factors such as air temperature, humidity, and turbulence can also have significant effects. (2)
2.3.4 Shielding
A large object or barrier in the path between a noise source and a receiver can substantially attenuate noise levels at the receiver. The amount of attenuation provided by shielding depends on the size of the object and the frequency content of the noise source. Shielding by trees and other such vegetation typically only has an "out of sight, out of mind" effect. That is, the perception of noise impact tends to decrease when vegetation blocks the line -of -sight to nearby residents. However, for vegetation to provide a substantial, or even noticeable, noise reduction, the vegetation area must be at least 15 feet in height, 100 feet wide and dense enough to completely obstruct the line -of -sight between the source and the receiver. This size of vegetation may provide up to 5 dBA of noise reduction. The Federal Highway Administration (FHWA) does not consider the planting of vegetation to be a noise abatement measure. (5)
2.4 NOISE CONTROL
Noise control is the process of obtaining an acceptable noise environment for an observation point or receiver by controlling the noise source, transmission path, receiver, or all three. This concept is known as the source -path -receiver concept. In general, noise control measures can be applied to these three elements.
2.5 NOISE BARRIER ATTENUATION
Effective noise barriers can reduce noise levels by 10 to 15 dBA, cutting the loudness of traffic noise in half. A noise barrier is most effective when placed close to the noise source or receiver. Noise barriers, however, do have limitations. For a noise barrier to work, it must block the line -of -sight path of sound from the noise source.
2.6 LAND USE COMPATIBILITY WITH NOISE
Some land uses are more tolerant of noise than others. For example, schools, hospitals, churches, and residences are more sensitive to noise intrusion than commercial or industrial developments and related activities. As ambient noise levels affect the perceived amenity or livability of a development, so too can the mismanagement of noise impacts impair the economic health and growth potential of a community by reducing the area's desirability as a place to live, shop and work.
For this reason, land use compatibility with the noise environment is an important consideration in the planning and design process. The FHWA encourages State and Local government to regulate land development in such a way that noise -sensitive land uses are either prohibited from being 16391-02 NA
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located adjacent to a highway, or that the developments are planned, designed, and constructed in such a way that noise impacts are minimized. (6)
2.7 COMMUNITY RESPONSE TO NOISE
Approximately sixteen percent of the population has a very low tolerance for noise and will object to any noise not of their making. Consequently, even in the quietest environment, some complaints may occur. Twenty to thirty percent of the population will not complain even in very severe noise environments. (7 pp. 8-6) Thus, a variety of reactions can be expected from people exposed to any given noise environment.
Surveys have shown that community response to noise varies from no reaction to vigorous action for newly introduced noises averaging from 10 dB below existing to 25 dB above existing. (8) According to research originally published in the Noise Effects Handbook (7), the percentage of high annoyance ranges from approximately 0 percent at 45 dB or less, 10 percent are highly annoyed around 60 dB, and increases rapidly to approximately 70 percent being highly annoyed at approximately 85 dB or greater. Despite this variability in behavior on an individual level, the population can be expected to exhibit the following responses to changes in noise levels as shown on Exhibit 2-2. A change of 3 dBA is considered barely perceptible, and changes of 5 dBA are considered readily perceptible. (4)
EXHIBIT 2-2: NOISE LEVEL INCREASE PERCEPTION
Twice as Loud
Readily Perceptible
Barely Perceptible
Just Perceptible
0 1 2 3 4 5 6 7 8 9 10
Noise Level Increase (dBA)
2.8 VIBRATION
Per the Federal Transit Administration (FTA)Transit Noise and Vibration Impact Assessment Manual, vibration is the periodic oscillation of a medium or object. The rumbling sound caused by the vibration of room surfaces is called structure -borne noise. Sources of ground -borne vibrations include natural phenomena (e.g., earthquakes, volcanic eruptions, sea waves, landslides) or human - made causes (e.g., explosions, machinery, traffic, trains, construction equipment). Vibration sources may be continuous, such as factory machinery, or transient, such as explosions. As is the case with airborne sound, ground -borne vibrations may be described by amplitude and frequency.
Additionally, in contrast to airborne noise, ground -borne vibration outdoors is not a common environmental problem and annoyance from ground -borne vibration is almost exclusively an indoor phenomenon )8(. Therefore, the effects of vibrations should only be evaluated at a structure and the effects of the building structure on the vibration should be considered. Wood -frame buildings, such as typical residential structures, are more easily excited by ground vibration than heavier buildings.
In contrast, large masonry buildings with spread footings have a low response to ground vibration 16391-02 NA
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(8). In general, the heavier a building is, the lower the response will be to the incident vibration energy. However, all structurers reduce vibration levels due to the coupling of the building to the soil.
There are several different methods that are used to quantify vibration. The peak particle velocity (PPV) is defined as the maximum instantaneous peak of the vibration signal (8). The PPV is most frequently used to describe vibration impacts to buildings but is not always suitable for evaluating human response (annoyance) because it takes some time for the human body to respond to vibration signals. Instead, the human body responds to average vibration amplitude often described as the root mean square (RMS). The RMS amplitude is defined as the average of the squared amplitude of the signal and is most frequently used to describe the effect of vibration on the human body (8).
However, the RMS amplitude and PPV are related mathematically, and the RMS amplitude of equipment is typically calculated from the PPV reference level. The RMS amplitude is approximately 70% of the PPV (9). Thus, either can be used in the description of vibration impacts.
While not universally accepted, vibration decibel notation (VdB) is another vibration notation developed and used by the FTA in their guidance manual to describe vibration levels and provide a background of common vibration levels and set vibration limits. (8) Decibel notation (VdB) serves to reduce the range of numbers used to describe vibration levels and is used in this report to describe vibration levels. As stated in the FTA guidance manual, the background vibration -velocity level in residential areas is generally 50 VdB. Ground -borne vibration is normally perceptible to humans at approximately 65 VdB. For most people, a vibration -velocity level of 75 VdB is the approximate dividing line between barely perceptible and distinctly perceptible levels. Typical outdoor sources of perceptible ground -borne vibration are construction equipment, steel -wheeled trains, and traffic on rough roads. If a roadway is smooth, the ground -borne vibration is rarely perceptible. The range of interest is from approximately 50 VdB, which is the typical background vibration -velocity level, to 100 VdB, which is the general threshold where minor damage can occur in fragile buildings. Exhibit 2-3 illustrates common vibration sources and the human and structural response to ground -borne vibration.
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EXHIBIT 2-3: TYPICAL LEVELS OF GROUND -BORNE VIBRATION
Human/Structural Response
Threshold, minor cosmetic damage
fragile buildings
Difficulty with tasks such as
reading a VDT screen
Velocity Typical Sources
Level* (50 ft from source)
Blasting tram construction projects
Bulldozers and other heavy tracked
construction equipment
Comrnuter rail, upper range
Residential annoyance, infrequent Rapid transit, upper range events (e.g. commuter rail)
Residential annoyance, frequent
events (e.g. rapid transit)
Limit for vibration sensitive
equipment. Approx. threshold for
human perception of vibration
Commuter rail, typical
Bus or truck over bump
Rapid transit, typical
Bus or truck, typical
Typical background vibration
' RMS Vibration Velocity Level in VdB relative to 10-6 inches/second Source: FederalTransitAdministration (FTA)Transit Noise and Vibration Impact Assessment Manual, 16391-02 NA
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3 REGULATORY SETTING
To limit population exposure to physically and/or psychologically damaging as well as intrusive noise levels, the federal government, the State of California, various county governments, and most municipalities in the state have established standards and ordinances to control noise. In most areas, automobile and truck traffic is the major source of environmental noise. Traffic activity generally produces an average sound level that remains constant with time. Air and rail traffic, and commercial and industrial activities are also major sources of noise in some areas. Federal, state, and local agencies regulate different aspects of environmental noise. Federal and state agencies generally set noise standards for mobile sources such as aircraft and motor vehicles, while regulation of stationary sources is left to local agencies.
3.1 STATE OF CALIFORNIA NOISE REQUIREMENTS
The State of California regulates freeway noise, sets standards for sound transmission, provides occupational noise control criteria, identifies noise standards, and provides guidance for local land use compatibility. State law requires that each county and city adopt a General Plan that includes a Noise Element which is to be prepared per guidelines adopted by the Governor's Office of Planning and Research (OPR). (10) The purpose of the Noise Element is to limit the exposure of the community to excessive noise levels. In addition, CEQA requires that all known environmental effects of a project be analyzed, including environmental noise impacts.
3.2 CITY OF RANCHO MIRAGE GENERAL PLAN NOISE ELEMENT
The City of Rancho Mirage has adopted a Noise Element of the General Plan (2017) to control and abate environmental noise, and to protect the citizens of and visitors to the City of Rancho Mirage from excessive exposure to noise. The Noise Element is intended to help align the community's various land uses with the existing and future noise environment and thus ensure that any negative effects of noise are minimized or completely avoided.
The noise criteria identified in the City of Rancho Mirage Noise Element are guidelines to evaluate the land use compatibility of transportation related noise. To assist the city in planning compatible uses, a range of exterior noise thresholds for various land uses have been developed. Particularly sensitive land uses include residences, schools, libraries, churches, hospitals and nursing homes, and destination resort areas. In addition, parks, golf courses, and other outdoor activity areas can be sensitive to noise disturbances. Less sensitive land uses include commercial uses, conventional hotels and motels, and playgrounds. Least sensitive to noise are heavy commercial uses, transportation, communication, and utility land uses. To protect noise sensitive land uses, and minimize the effects of excessive and nuisance noise, the City of Rancho Mirage General Plan Noise Element has outlined the following noise policies with the goal (Goal N 1) of a noise environment providing peace and quiet that complements and is consistent with Rancho Mirage's resort residential character:
Policy N 1.1: Land use patterns, associated traffic and its distribution, and individual developments shall be assessed for their potential to generate adverse and incompatible noise impacts. Noise exceeding normally acceptable levels shall be appropriately mitigated.
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Policy N 1.2 Noise sensitive land uses, including residences, resorts, community open space, schools, libraries, churches, hospitals, and convalescent homes, shall be protected from high noise levels emitted by both existing and future noise sources.
Policy N 1.3 Project designs shall be required to include measures that assure that interior noise levels for residential development do not exceed 45 dBA CNEL.
Land uses allowed adjacent to Rancho Mirage's major arterial roads and highways, or the Southern Pacific Railroad/I-10 corridor, should generally be limited to those that are compatible with higher noise levels to maximize noise -related land use compatibility.
Develop and maintain a circulation plan that is consistent with the resort residential character of Rancho Mirage, avoids impacts to existing and planned sensitive receptors/uses, and provides fixed routes for existing and future truck traffic.
The Noise Level and Land Use Compatibility matrix in the Noise Element shown on Exhibit 3-A provides guidelines to evaluate the acceptability of the transportation related noise level impacts.
Single-family residential land uses are considered normally acceptable with exterior noise levels below 60 dBA CNEL and conditionally acceptable with noise levels below 70 dBA CNEL. Multi -family residential land uses are considered normally acceptable with exterior noise levels below 65 dBA CNEL and conditionally acceptable with noise levels below 70 dBA CNEL. For conditionally acceptable land use, new construction or development undertaken only after a detailed analysis of the noise reduction requirements is made and necessary noise insulation features are included in the design.
Conventional construction, but with closed windows and fresh air supply system or air conditioning will normally suffice. Outdoor environment will seem noisy.
Policy N 1.4
Policy N 1.5
3.3 OPERATIONAL NOISE STANDARDS
To analyze noise impacts originating from a designated fixed location or private property such as the Howard World Wildlife Museum, stationary -source (operational) noise such as the loading dock activity, trash enclosure activity, roof -top air conditioning units, and parking lot vehicle movements are typically evaluated against standards established under a jurisdiction's Municipal Code. The City of Rancho Mirage Municipal Code (RMMC) noise standards are provided in Appendix 3.1. The RMMC Chapter 8.45 establishes the noise level standards for stationary noise sources. The Project's land use will potentially impact nearby noise -sensitive uses in the Project study area. For nearby noise - sensitive residential land uses in the Project study area, Section 8.45.030 identifies the base exterior noise level standard of 55 dBA Leq during the daytime hours (7:00 a.m. to 6:00 p.m.), 50 dBA Leq during the evening hours (6:00 p.m. to 10:00 p.m.) and 45 dBA Leq during the nighttime hours (10:00 p.m. to 7:00 a.m.). (11) Further, Section 8.45.030[C] indicates that if the existing ambient noise level already exceeds any of the exterior noise level categories, then the standard shall be increased in five dBA increments to reflect the ambient conditions. Table 3-1 provides a summary of the City of Rancho Mirage operational exterior noise level standards for all land use types. 16391-02 NA
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EXHIBIT 3-A: NOISE LEVEL AND LAND USE COMPATIBILITY
LAND USE CATEGORIES
Residential, low density (single-family dwellings,
duplex, + mobile homes)
Residential multi -family
Transient lodging (motels and hotels)
Schools, libraries, churches, hospitofs, nursing homes
Auditoriums, concert halls, amphitheaters
Sports arena, outdoor spectator sports
Playgrounds, neighborhood parks
Gold courses, riding stables, water recreation, cemeteries Office buildings, business, commercial, professional
Industrial, manufacturing, utilities, agriculture
Normally
Acceptable
Conditionally
Acceptable
Specified land use satisfactory based upon the
assumption that any buildings are
conventionally constructed with no special
noise installation requirements.
New construction or development
undertaken only after detailed analysis of the
noise reduction requirements is made and
necessacry noise Insultation featured are
included in design. Conventional
construction, but with closed windows and
fresh air supply system or air conditioning
with normally suffice. Outdoor environment
will seem noisy,
COMMUNITY Noose EXPOSURE LEVEL (UN OR'CNEL, DBAI
55 60 65 70 75
Normally
Unacceptable
Clearly
Unacceptable
New construction or development generally
discouraged, but if it does proceed, a
detailed analysis of noise reduction
requirements must be mode with needed
noise insulation features included in design
and outdoor areas must be shielded,
New construction or development generally
not undertaken. Construction cost to make
Indoor environment acceptable would be
prohibitive and outdoor environment would
not be usable.
Source: City of Rancho Mirage General Plan Noise Element (2017) Exhibit 20 16391-02 NA
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17 TABLE 3-1: OPERATIONAL NOISE STANDARDS
Land
U e1
Zone2
me
PeTl Ir od
Exterior Noise
Level Standards
(dBA Leq)3
Daytime (7:00 a.m. to 6:00 p.m.)
55 Residential
(Low Density)
R -E, H -R,
R L 2, R L 3
Evening (6:00 p.m. to 10:00 p.m.)
50 Nighttime (10:00 p.m. to 7:00 a.m.)
45 Residential
(Medium and High Density,
Hospital, Open Space)
OS, R -M,
R H, MHP
Daytime (7:00 a.m. to 6:00 p.m.)
Evening (6:00 p.m. to 10:00 p.m.)
Nighttime (10:00 p.m. to 7:00 a.m.)
60 55
50 Commercial Office, Resort
Commercial, Mixed Use,
Institutional
O, P, Rs -H,
M -U
Daytime (7:00 a.m. to 6:00 p.m.)
Evening (6:00 p.m. to 10:00 p.m.)
Nighttime (10:00 p.m. to 7:00 a.m.)
65 60
55 Commercial Neighborhood,
Daytime (7:00 a.m. to 6:00 p.m.)
70 General Commercial, Commercial
C N, L G, I
Evening (6:00 p.m. to 10:00 p.m.)
65 Recreation, Light Industrial
Nighttime (10:00 p.m. to 7:00 a.m.)
60 'City of Rancho Mirage Municipal Code, Section 8.45.030 Exterior noise level limits (Appendix 3.1). 'City of Rancho Mirage Land Use and Zoning Map
3 Leq represents a steady state sound level containing the same total energy as a time varying signal over a given sample period.
3.4 CONSTRUCTION NOISE STANDARDS
To analyze noise impacts originating from the construction of Howard World Wildlife Museum, noise from construction activities is typically evaluated against standards established under a City's Municipal Code. To control noise impacts associated with the construction of the proposed Project, the City has established limits to the hours of operation. RMMC Section 15.04.030[A][11] indicates that construction, shall be limited to the hours of 7:00 a.m. and 7:00 p.m. with no activity on Sundays and holidays (12). The city recognizes that construction noise is difficult to control and restricts allowable hours for this intrusion. Still, construction, even when restricted within these hours, presents a nuisance value when conducted in proximity to sensitive receptors (13). However, neither the City of Rancho Mirage General Plan nor Municipal Code establish numeric maximum acceptable construction source noise levels at potentially affected receivers. Therefore, a numerical construction threshold based on Federal Transit Administration (FTA) Transit Noise and Vibration Impact Assessment Manual is used for analysis of daytime construction impacts, as discussed below.
According to the FTA, local noise ordinances are typically not very useful in evaluating construction noise. They usually relate to nuisance and hours of allowed activity, and sometimes specify limits in terms of maximum levels, but are generally not practical for assessing the impact of a construction project. Project construction noise criteria should account for the existing noise environment, the absolute noise levels during construction activities, the duration of the construction, and the adjacent land use. Due to the lack of standardized construction noise thresholds, the FTA provides guidelines that can be considered reasonable criteria for construction noise assessment. The FTA considers a daytime exterior construction noise level of 80 dBA Leq as a reasonable threshold for noise sensitive residential land use. (8 p. 179)
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3.5 VIBRATION STANDARDS
Construction activity can result in varying degrees of ground -borne vibration, depending on the equipment and methods used, distance to the affected structures and soil type. Construction vibration is generally associated with pile driving and rock blasting. Other construction equipment such as air compressors, light trucks, hydraulic loaders, etc., generates little or no ground vibration. (8)
To analyze vibration impacts associated with the Howard World Wildlife Museum, vibration - generating activities are appropriately evaluated against standards established under a City's Municipal Code if such standards exist. While Section 17.18.080 of the RMMC requires that no vibration associated with any use shall be allowed which is discernable beyond the boundary line of the subject property, the City of Rancho Mirage does not identify specific construction vibration level limits. Therefore, for analysis purposes, the Caltrans Transportation and Construction Vibration Guidance Manual, (9 p. 38)Table 19, vibration damage are used in this noise study to assess potential temporary construction -related impacts at adjacent building locations. The nearest noise sensitive buildings adjacent to the Project site can best be described as "older residential structures" with a maximum acceptable continuous vibration threshold of 0.3 PPV (in/sec). 16391-02 NA
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4 SIGNIFICANCE CRITERIA
The following significance criteria are based on currently adopted guidance provided by Appendix G of the CEQA Guidelines. (1) For the purposes of this report, impacts would be potentially significant if the Project results in or causes:
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?
B. Generation of excessive ground -borne vibration or ground -borne noise levels? 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?
4.1 NOISE LEVEL INCREASES (THRESHOLD A)
Noise level increases resulting from the Project are evaluated based on the Appendix G CEQA Guidelines. UnderCEQA, consideration must be given to the magnitude of the increase, the existing baseline ambient noise levels, and the location of receivers to determine if a noise increase represents a significant adverse environmental impact. This approach recognizes that there is no single noise increase that renders the noise impact significant. (14) This is primarily because of the wide variation in individual thresholds of annoyance and differing individual experiences with noise.
Thus, an important way of determining a person's subjective reaction to a new noise is the comparison of it to the existing environment to which one has adapted —the so-called ambient environment. In general, the more a new noise level exceeds the previously existing ambient noise level, the less acceptable the new noise level will typically be judged.
4.1.1 Operational Noise (Substantial Permanent Noise Level Increase) The Federal Interagency Committee on Noise (FICON) (15) developed guidance to be used for the assessment of project -generated increases in noise levels that consider the ambient noise level. The FICON recommendations are based on studies that relate aircraft noise levels to the percentage of persons highly annoyed by aircraft noise. Although the FICON recommendations were specifically developed to assess aircraft noise impacts, these recommendations are often used in environmental noise impact assessments involving the use of cumulative noise exposure metrics, such as the average -daily noise level (CNEL) and equivalent continuous noise level (Leq).
As previously stated, the approach used in this noise study recognizes that there is no single noise increase that renders a noise impact significant, based on a 2008 California Court of Appeal ruling on Gray v. County of Madera. (14) For example, if the ambient noise environment is quiet (<60 dBA) and the new noise source greatly increases the noise levels, an impact may occur if the noise criteria may be exceeded. Therefore, for this analysis, a readily perceptible 5 dBA or greater project -related noise level increase is considered a significant impact when the without project noise levels are below 60 dBA. Per the FICON, in areas where the without project noise levels range from 60 to 65 dBA, a 3 dBA barely perceptible noise level increase appears to be appropriate for most people.
When the without project noise levels already exceed 65 dBA, any increase in community noise louder than 1.5 dBA or greater is considered a significant impact if the noise criteria for a given land use is exceeded, since it likely contributes to an existing noise exposure exceedance. 16391-02 NA
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The FICON guidance provides an established source of criteria to assess the impacts of substantial temporary or permanent increase in baseline ambient noise levels. Based on the FICON criteria, the amount to which a given noise level increase is considered acceptable is reduced when the without Project (baseline) noise levels are already shown to exceed certain land -use specific exterior noise level criteria. The specific levels are based on typical responses to noise level increases of 5 dBA or readily perceptible, 3 dBA or barely perceptible, and L5 dBA depending on the underlying without Project noise levels for noise -sensitive uses. These levels of increases and their perceived acceptance are consistent with guidance provided by both the Federal Highway Administration (4 p. 9) and Caltrans (16 p. 2_48).
4.1.2 Construction Noise (Substantial Temporary Noise Increase) To control the noise -generating construction activities, the temporary noise level increases over the existing ambient conditions must be considered under CEQA Significance Threshold A. Increases of up to 20 dBA Leq are permitted according to Table B-1 of the RMMC. Although noise ordinances vary across jurisdictions, many cities and counties in California, including Los Angeles, San Diego, and San Francisco, set construction noise limits between 75 and 80 dBA Leq and typically restrict construction activities to the daytime hours. In contrast, everyday noise regulations are more stringent because they apply to continuous, long-term noise sources that can significantly impact the quality of life. As a result, many jurisdictions establish daytime residential noise limits around 55 dBA Leq. This suggests that a reasonable 20 dBA increase over the daytime noise limit can be tolerated without significant adverse effects. This is also illustrated in the adoption of many CEQA documents statewide that use an 80 dBA Leq limit for assessing construction impacts while using everyday noise level limits of local noise ordinances in assessing on -site operational impacts.
Therefore, if the Project -related construction noise levels generate a temporary noise level increase over the existing daytime ambient noise levels more than 20 dBA Leq consistent with Table B-1 of the RMMC, then the Project construction noise increases will be considered a significant impact.
4.2 VIBRATION (THRESHOLD B)
As described in Section 3.4, vibration impacts originating from the construction of the Howard World Wildlife Museum, vibration -generating activities are appropriately evaluated using standards established by the Caltrans Transportation and Construction Vibration Guidance Manual, Table 19.
Caltrans' vibration thresholds for building damage are used in this noise study to assess potential operational and temporary construction -related impacts at adjacent building locations. A maximum acceptable continuous vibration threshold of 0.3 PPV (in/sec) is used to describe the nearest residential buildings adjacent to the Project site.
4.3 CEQA GUIDELINES NOT FURTHER ANALYZED (THRESHOLD C)
CEQA Noise Threshold C applies when there are nearby public and private airports and/or airstrips and focuses on land use compatibility of the Project to nearby airports and airstrips. The Project site is not located within two miles of an airport or airstrip. The closest major airport is the Palm Springs International Airport (PSP), which is located over 4.5 miles north of the Project site As such, the Project site would not be exposed to excessive noise levels from airport operations, and therefore, impacts are considered less than significant, and no further noise analysis is conducted in relation to Appendix G to the CEQA Guidelines, Noise Threshold C.
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4.4 SIGNIFICANCE CRITERIA SUMMARY
Noise impacts shall be considered significant if any of the following occur as a direct result of the proposed development. Table 4-1 shows the significance criteria summary matrix that includes the allowable criteria used to identify potentially significant incremental noise level increases.
TABLE 4-1: SIGNIFICANCE CRITERIA SUMMARY
Analysis
Receiving
Land Use
Condition(s)
Significance Criteria
Daytime Nighttime
Operational
Construction
Noise -Sensitive
Noise -Sensitive
Exterior Noise Levels'
If ambient is 65 dBA Leq2
Noise Level Threshold3
Exterior Noise Level Increase4
Vibration Level Thresholds
See Table 3-1
≥ 5 dBA Leq Project increase
≥ 3 dBA Leq Project increase
≥ 1.5 dBA Leq Project increase
80 dBA Leq n/a
20 dBA Leq
0.3 PPV (in/sec)
'City of Rancho Mirage Municipal Code, Section 8.45.030 Exterior Noise Level Limits (Appendix 3.1). 2 FICON, 1992.
'Federal Transit Administration, Transit Noise and Vibration Impact Assessment Manual. 4City of Rancho Mirage Municipal Code, Table B-1 (Appendix 3.1). 5 Caltrans Transportation and Construction Vibration Manual, April 2020 Table 19 "Daytime" = 7:00 a.m. to 10:00 p.m.; "Nighttime" = 10:00 p.m. to 7:00 a.m. 16391-02 NA
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5 EXISTING NOISE LEVEL MEASUREMENTS
To assess the existing noise level environment, 24 -hour noise level measurements were taken at six locations in the Project study area. The receiver locations were selected to describe and document the existing noise environment within the Project study area. Exhibit 5-1 provides the boundaries of the Project study area and the noise level measurement locations. To fully describe the existing noise conditions, long-term noise level measurements were collected by Urban Crossroads, Inc. on Tuesday, April 29, 2025. Appendix 5.1 includes study area photos.
5.1 MEASUREMENT PROCEDURE AND CRITERIA
To describe the existing noise environment, the hourly noise levels were measured during typical weekday conditions over a 24 -hour period. By collecting individual hourly noise level measurements, it is possible to describe the equivalent daytime and nighttime hourly noise levels.
The long-term noise readings were recorded using Piccolo Type 2 integrating sound level meter and dataloggers. The Piccolo sound level meters were calibrated using a Larson -Davis calibrator, Model CAL 150. All noise meters were programmed in "slow" mode to record noise levels in "A" weighted form. The sound level meters and microphones were equipped with a windscreen during all measurements. All noise level measurement equipment satisfies the American National Standards Institute (ANSI) standard specifications for sound level meters ANSI S1.4-2014/IEC 61672-1:2013. (17)
5.2 NOISE MEASUREMENT LOCATIONS
The long-term noise level measurements were positioned as close to the nearest sensitive receiver locations as possible to assess the existing equivalent hourly noise levels surrounding the Project site. Both Caltrans and the FTA recognize that it is not reasonable to collect noise level measurements that can fully represent every part of a private yard, patio, deck, or balcony normally used for human activity when estimating impacts for new development projects. This is demonstrated in the Caltrans general site location guidelines which indicate that sites must be free of noise contamination by sources other than sources of interest. Avoid sites located near sources such as barking dogs, lawnmowers, pool pumps, and air conditioners unless it is the express intent of the analyst to measure these sources. (2) Further, FTA guidance states, that it is not necessary nor recommended that existing noise exposure be determined by measuring at every noise -sensitive location in the project area. Rather, the recommended approach is to characterize the noise environment for clusters of sites based on measurements or estimates at representative locations in the community. (8)
Based on recommendations of Caltrans and the FTA, it is not necessary to collect measurements at each individual building or residence, because each receiver measurement represents a group of buildings that share acoustic equivalence. (8) In other words, the area represented by the receiver shares similar shielding, terrain, and geometric relationship to the reference noise source. Receivers represent a location of noise sensitive areas and are used to estimate the future noise level impacts. 16391-02 NA
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EXHIBIT 5-1: NOISE MEASUREMENT LOCATIONS
LEGEND:
L-1 Site Boundary ® Measurement Locations
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Collecting noise level measurements at the nearby sensitive receiver locations allows for a comparison of the before and after Project noise levels and is necessary to assess potential noise increase due to the Project's contribution to the ambient noise levels. This approach is necessary to calculate the temporary or permanent increase in ambient noise levels as required by the CEQA Guidelines Environmental Checklist.
5.3 NOISE MEASUREMENT RESULTS
The noise measurements presented below focus on the equivalent or the hourly energy average sound levels (Leq) to describe the existing ambient conditions. Table 5-1 provides the (energy average) noise levels used to describe the hourly daytime (7:00 a.m. to 6:00 p.m.), evening (6:00 p.m. to 10:00 p.m.) and nighttime (10:00 p.m. to 7:00 a.m.) noise levels at each noise level measurement location. The equivalent sound level (Leq) represents a steady state sound level containing the same total energy as a time varying signal over a given sample period. The daytime and nighttime equivalent noise levels represent the average of all hourly noise levels observed during these time periods expressed as a single number.
TABLE 5-1: AMBIENT NOISE LEVEL MEASUREMENTS
Location'
Description
Energy Average Noise Level
(dBA Leq)2
CNEL
Daytime
Evening
Nighttime
L1
L2
L3
L4
L5
L6
Located north of the site within the Desert Braemar
community near the residence at 69850 CA -111
Located east of the site near the residence at 70100
Mirage Cove Drive.
Located south of the site near the residence at 1 E
the Palms St.
Located southwest of the site near the residence at
8 Vista Loma Dr.
Located within the site near the residence at 70100
Mirage Cove Dr.
Located within the site east of CA -111.
61.3 54.0
61.3 54.3
63.1 61.6
59.6 48.4
59.2 61.9
61.2 61.0
48.1 43.2
54.3 52.0
54.0 57.8
63.5 53.6
63.0 59.0
64.0 65.4
' See Exhibit 5-A for the noise level measurement locations. 2 Energy (logarithmic) average levels. The long-term 24 -hour measurement worksheets are included in Appendix 5.2. "Daytime" = 7:00 a.m. to 6:00 p.m.; "Evening" = 6:00 p.m. to 10:00 p.m.; "Nighttime" = 10:00 p.m. to 7:00 a.m.
Table 54 provides the equivalent noise levels used to describe the daytime and nighttime ambient conditions for each of the measurements. Appendix 5.2 provides summary worksheets of the noise levels for each hour as well as the minimum, maximum, L1, L2, L5, L8, L25, L50, L90, L95, and L99 percentile noise levels observed during the daytime and nighttime periods. 16391-02 NA
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6 RECEIVER LOCATIONS
To assess the potential for long-term operational and short-term construction noise impacts, the following receiver locations, as shown on Exhibit 6-1, were identified as representative locations for analysis. The selection of receiver locations is based on FHWA guidelines and is consistent with additional guidance provided by Caltrans and the FTA, as previously described in Section 5.2.
Sensitive receivers are generally defined as locations where people reside or where the presence of unwanted sounds could otherwise adversely affect the use of the land. Noise -sensitive land uses are generally considered to include schools, hospitals, single-family dwellings, mobile home parks, churches, libraries, and recreation areas. Moderately noise -sensitive land uses typically include multi -family dwellings, hotels, motels, dormitories, out -patient clinics, cemeteries, golf courses, country clubs, athletic/tennis clubs, and equestrian clubs. Land uses that are considered relatively insensitive to noise include business, commercial, and professional developments. Land uses that are typically not affected by noise include: industrial, manufacturing, utilities, agriculture, undeveloped land, parking lots, warehousing, liquid and solid waste facilities, salvage yards, and transit terminals.
To describe the potential off -site Project noise levels, four receiver locations in the vicinity of the Project site were identified. Other sensitive land uses in the Project study area that are located at greater distances than those identified in this noise study will experience lower noise levels than those presented in this report due to the additional attenuation from distance and the shielding of intervening structures. Distance is measured in a straight line from the Project boundary to each receiver location.
R1: Location R1 represents the existing high -density residence within the Desert Braemar community at 69850 CA -111, approximately 138 feet north of the Project site. Since there are no private outdoor living areas (backyards) facing the Project site, receiver R1 is placed at the residential building facade. A 24 -hour noise measurement was taken near this location, L1, to describe the existing ambient noise environment.
R2: Location R2 represents the existing high -density residence within the Small Mountain Private Condominiums community near the at 70100 Mirage Cove Drive, approximately 23 feet east of the Project site. Receiver R2 is placed in the private outdoor living area (backyard) facing the Project site. A 24 -hour noise measurement was taken near this location, L2, to describe the existing ambient noise environment.
R3: Location R3 represents the existing residence at 1 E the Palms Street, approximately 94 feet south of the Project site. Receiver R3 is placed in the private outdoor living area (backyard) facing the Project site. A 24 -hour noise measurement was taken near this location, L3, to describe the existing ambient noise environment.
R4: Location R4 represents the single-family residence at 8 Vista Loma Drive within the Mirage Cove low density residential community, approximately 703 feet west of the Project site.
Receiver R4 is placed in the private outdoor living area (backyard) facing the Project site. A 24 -hour noise measurement was taken near this location, L4, to describe the existing ambient noise environment.
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EXHIBIT 6-1: RECEIVER LOCATIONS
LEGEND:
L-7 Site Boundary Receiver Locations —i Distance from receiver to Project site boundary (in feet) 16391-02 NA
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7 OPERATIONAL NOISE ANALYSIS
This section analyzes the potential stationary -source operational noise impacts at the nearby receiver locations, identified in Section 6, resulting from the operation of the proposed Howard World Wildlife Museum Project. To conservatively describe the potential worst -case noise environment, Exhibit 7-1 presents the 22 individual noise sources used to assess the operational noise levels.
7.1 OPERATIONAL NOISE SOURCES
This operational noise analysis is intended to describe noise level impacts associated with the expected typical daytime and nighttime activities at the Project site. The on -site Project -related noise sources are expected to include: loading dock activity, trash enclosure activity, roof -top air conditioning units, and parking lot vehicle movements.
7.2 REFERENCE NOISE LEVELS
To estimate the Project operational noise impacts, reference noise level measurements were collected from similar types of activities to represent the noise levels expected with the development of the proposed Project. This section provides a detailed description of the reference noise level measurements shown on Table 7-1 used to estimate the Project operational noise impacts. It is important to note that the following projected noise levels assume the worst -case noise environment with all noise source activity all operating at the same time. These sources of noise activity will likely vary throughout the day.
7.2.1 Measurement Procedures
The reference noise level measurements presented in this section were collected using a Larson Davis LxTType 1 precisions sound level meter (serial number 01146). The LxT sound level meter was calibrated using a Larson -Davis calibrator, Model CAL 200, was programmed in "slow" mode to record noise levels in "A" weighted form and was located at approximately five feet above the ground elevation for each measurement. The sound level meters and microphones were equipped with a windscreen during all measurements. All noise level measurement equipment satisfies the American National Standards Institute (ANSI) standard specifications for sound level meters ANSI S1.4- 2014/IEC 61672-1:2013. (17)
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EXHIBIT 7-1: OPERATIONAL NOISE SOURCE LOCATIONS
LEGEND:
Ell Site Boundary
0 Roof -Top Air Conditioning Unit
♦ Trash Enclosure Activity
Loading Dock Activity
Parking Lot Vehicle Movements
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TABLE 7-1: REFERENCE NOISE LEVEL MEASUREMENTS
Reference
Noise Source
Noise
Source
Height
(Feet)
Min./
Hour'
Reference
Noise Level
(dBA Leq)
@ 50 Feet
Sound
Power
Level
(dBA)2
Day
Eve
Night
Loading Dock Activity
8'
5'
5'
5'
60 60
39 60
0 60
39 60
0 0
28 0
62.8 57.3
57.2 52.6
103.4
89.0 88.9
81.1 Trash Enclosure Activity
Roof -Top Air Conditioning Units
Parking Lot Vehicle Movements
'Anticipated duration (minutes within the hour) of noise activity during typical hourly conditions expected at the Project site. "Daytime" = 7:00 a.m. to 6:00 p.m.; "Evening" = 6:00 p.m. to 10:00 p.m.; "Nighttime" = 10:00 p.m. to 7:00 a.m. 2 Sound power level represents the total amount of acoustic energy (noise level) produced by a sound source independent of distance or surroundings. Sound power levels calculated using the CadnaA noise model at the reference distance to the noise source. Numbers may vary due to size differences between point and area noise sources.
7.2.2 Loading Dock Activity
To evaluate the noise levels associated with truck idling, backup alarms, trailer movements and loading activities, Urban Crossroads collected a reference noise level measurement to describe the potential operational noise levels associated with the Project loading dock activities. The measured reference noise level at 50 feet from the source of activity was measured at 62.8 dBA Leq. Loading dock activities are limited to daytime hours.
7.2.3 Trash Enclosure Activity
To describe the noise levels associated with a trash enclosure activity, Urban Crossroads collected a reference noise level measurement at an existing trash enclosure containing two dumpster bins. The trash enclosure noise levels describe metal gates opening and closing, metal scraping against concrete floor sounds, dumpster movement on metal wheels, and trash dropping into the metal dumpster. The reference noise levels describe trash enclosure noise activities when trash is dropped into an empty metal dumpster, as would occur at the Project Site. The measured reference noise level at the uniform 50 -foot reference distance is 57.3 dBA Leq for the trash enclosure activity. The reference noise level describes the expected noise source activities associated with the trash enclosures for the Project's proposed building.
7.2.4 Roof -Top Air Conditioning Units
The reference noise level represents a Lennox SCA120 series 10 -ton model packaged air conditioning unit. At the uniform reference distance of 50 feet, the reference noise level is 57.2 dBA Leq. Based on the typical operating conditions observed over a four -day measurement period, the roof -top air conditioning units are estimated to operate for and average 39 minutes per hour during the daytime hours, and 28 minutes per hour during the nighttime hours. For this noise analysis, the air conditioning units are expected to be located on the roof of the Project buildings. 16391-02 NA
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7.2.5 Parking Lot Vehicle Movements
To describe the on -site parking lot activity, a long-term noise level measurement was collected in the center of activity within a reference parking lot. At 50 feet from the center of activity, the parking lot produced a reference noise level of 52.6 dBA Leq. Parking activities are expected to take place during the full hour (60 minutes) throughout the daytime and evening hours. The parking lot noise levels are mainly due to cars pulling in and out of parking spaces in combination with car doors opening and closing.
7.3 CADNAA NOISE PREDICTION MODEL
To fully describe the exterior operational noise levels from the Project, Urban Crossroads, Inc. developed a noise prediction model using the CadnaA (ComputerAided Noise Abatement) computer program. CadnaA can analyze multiple types of noise sources using the spatially accurate Project site plan, georeferenced Nearmap aerial imagery, topography, buildings, and barriers in its calculations to predict outdoor noise levels. Using the ISO 9613-2 protocol, CadnaA will calculate the distance from each noise source to the noise receiver locations, using the ground absorption, distance, and barrier/building attenuation inputs to provide a summary of noise level at each receiver and the partial noise level contributions by noise source.
Consistent with the ISO 9613-2 protocol, the CadnaA noise prediction model relies on the reference sound power level (Lw) to describe individual noise sources. While sound pressure levels (e.g., Leq) quantify in decibels the intensity of given sound sources at a reference distance, sound power levels (Lw) are connected to the sound source and are independent of distance. Sound pressure levels vary substantially with distance from the source and diminish because of intervening obstacles and barriers, air absorption, wind, and other factors. Sound power is the acoustic energy emitted by the sound source and is an absolute value that is not affected by the environment. The operational noise level calculations provided in this noise study account for the distance attenuation provided due to geometric spreading, when sound from a localized stationary source (i.e., a point source) propagates uniformly outward in a spherical pattern. A default ground attenuation factor of 0.5 was used in the noise analysis to account for mixed ground representing a combination of hard and soft surfaces.
This approach ensures a reasonable approximation in environments where both hard and soft surfaces exist, aligning with typical real -world conditions. Appendix 7.1 includes the detailed noise dBA Leq model inputs used to estimate the Project operational noise levels presented in this section.
7.4 PROJECT OPERATIONAL NOISE LEVELS
Using the reference noise levels to represent the Project operations that include loading dock activity, trash enclosure activity, roof -top air conditioning units, and parking lot vehicle movements, Urban Crossroads, Inc. calculated the operational source noise levels that are expected to be generated at the Project site and the Project -related noise level increases that would be experienced at each of the sensitive receiver locations. Table 7-2 shows the Project operational noise levels during the daytime hours from 7:00 a.m. to 6:00 p.m. The daytime hourly noise levels at the off -site receiver locations are expected to range from 34.1 to 55.0 dBA Leq. 16391-02 NA
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TABLE 7-2: DAYTIME PROJECT OPERATIONAL NOISE LEVELS
Noise Source'
Operational Noise Levels by Receiver Location (dBA Leq) R1
R2
R3
R4
Loading Dock Activity
54.4 43.6
41.4 38.3
20.5 10.9
15.0 46.9
18.0 8.7
14.4 38.4
28.1 13.9
32.0 25.0
Trash Enclosure Activity
Roof -Top Air Conditioning Units
Parking Lot Vehicle Movements
Total (AII Noise Sources)
55.0 46.9
38.5 34.1
' See Exhibit 7-1 for the noise source locations. CadnaA noise model calculations are included in Appendix 7.1.
Table 7-3 shows the Project operational noise levels during the evening hours from 6:00 p.m. to 10:00 a.m. The evening hourly noise levels at the existing off -site receiver locations are expected to range from 34.4 to 48.5 dBA Leq.
TABLE 7-3: EVENING PROJECT OPERATIONAL NOISE LEVELS
Noise Source'
Operational Noise Levels by Receiver Location (dBA Leq) R1
R2
R3
R4
Loading Dock Activity
0.0 45.2
43.0 39.9
0.0 12.5
16.7 48.5
0.0 10.3
16.1 40.0
0.0 15.5
33.6 26.6
Trash Enclosure Activity
Roof -Top Air Conditioning Units
Parking Lot Vehicle Movements
Total (AII Noise Sources)
48.0 48.5
40.0 34.4
See Exhibit 7-1 for the noise source locations. CadnaA noise model calculations are included in Appendix 7.1.
Table 7-4 shows the Project operational noise levels during the nighttime hours from 10:00 p.m. to 7:00 a.m. The nighttime hourly noise levels at the existing off -site receiver locations are expected to range from 14.0 to 40.3 dBA Leq.
TABLE 7-4: NIGHTTIME PROJECT OPERATIONAL NOISE LEVELS
Noise Source'
Operational Noise Levels by Receiver Location (dBA Leq) R1
R2
R3
R4
Loading Dock Activity
0.0 0.0
40.3 0.0
0.0 0.0
14.0 0.0
0.0 0.0
13.4 0.0
0.0 0.0
30.9 0.0
Trash Enclosure Activity
Roof -Top Air Conditioning Units
Parking Lot Vehicle Movements
Total (AII Noise Sources)
40.3 14.5
14.0 30.9
' See Exhibit 7-1 for the noise source locations. CadnaA noise model calculations are included in Appendix 7.1.
The differences between the daytime and nighttime noise levels are largely related to the estimated duration of noise activity as outlined in Table 7-1. Appendix 7.1 includes the detailed noise model inputs.
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7.5 PROJECT OPERATIONAL NOISE LEVEL COMPLIANCE
To demonstrate compliance with local noise regulations, the Project -only operational noise levels are evaluated against exterior noise level thresholds based on the City of Rancho Mirage exterior noise level standards by zoning type at the nearby receiver locations. Table 7-5 shows that the operational noise levels associated with Project will not exceed the City of Rancho Mirage daytime, evening and nighttime exterior noise level standards at the existing nearby noise -sensitive receiver locations. Therefore, the operational noise impacts are considered less than significant at the nearby noise -sensitive receiver locations.
TABLE 7-5: OPERATIONAL NOISE LEVEL COMPLIANCE
Receiver
Location
Zoning
Project Operational
Noise Levels (dBA Leq)2
Noise Level Standards
(dBA Leq)3
Noise Level Standards
Exceeded?4
Day
Eve.
Night
Day
Eve.
Night
Day
Eve.
Night
R1
R -H
55.0 48.0
40.3 60
55 50
No
No
No
R2
R -H
46.9 48.5
14.5 60
55 50
No
No
No
R3
C -G
38.5 40.0
14.0 70
65 60
No
No
No
R4
R -L-2
34.1 34.4
30.9 55
50 45
No
No
No
See Exhibit 6-1 for the receiver locations.
2 Proposed Project unmitigated operat onal noise evels as shown on Tables 7-2, 7-3 and 7-4. 'City of Rancho Mirage Municipal Code, Section 8.45.030 Exterior noise level limits (Appendix 3.1) ° Do the estimated Project operational noise source activities exceed the noise level standards? "Daytime" = 7:00 a.m. to 6:00 p.m.; "Evening" = 6:00 p.m. to 10:00 p.m.; "Nighttime" = 10:00 p.m. to 7:00 a.m.
7.6 PROJECT OPERATIONAL NOISE LEVEL INCREASES
To describe the Project operational noise level increases, the Project operational noise levels are combined with the existing ambient noise levels measurements for the nearby receiver locations that may be potentially impacted by Project operational noise sources. Since the units used to measure noise, decibels (dB), are logarithmic units, the Project -operational and existing ambient noise levels cannot be combined using standard arithmetic equations. (2) Instead, they must be logarithmically added using the following base equation:
SPLTotal = 1010g1o[10SPL1/10 + 10SPL2/1.0 + .. 10SPLn/1o] where "SPL1," "SPL2," etc. are equal to the sound pressure levels being combined, or in this case, the Project -operational and existing ambient noise levels. The difference between the combined Project and ambient noise levels describes the Project noise level increases to the existing ambient noise environment. Noise levels that would be experienced at receiver locations when Project - source noise is added to the daytime, evening and nighttime ambient conditions are presented in Tables 7-6, 7-7 and 7-8, respectively. As indicated on Table 7-6, the Project will generate daytime operational noise increases ranging from 0.0 to 0.9 dBA Leq at the nearest receiver locations. Table 7-7 shows that the Project will generate evening operational noise increases ranging from 0.0 to 3.1 dBA Leq at the nearest receiver locations. Table 7-8 shows that the Project will generate nighttime operational noise increases ranging from 0.0 to 0.7 dBA Leq at the nearest receiver locations. 16391-02 NA
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Project -related operational noise level increases would not exceed the operational noise level increase significance criteria presented in Table 4-1. Therefore, Project related operational noise level increases at the sensitive receiver locations will be less than significant.
TABLE 7-6: DAYTIME PROJECT OPERATIONAL NOISE LEVEL INCREASES Receiver
Location'
Total Project
Operational
Noise LeveI2
Measurement
Location3
Reference
Ambient
Noise Levels4
Combined
Project
and
Ambient6
Project
Increase6
Increase
Criteria'
Increase
Criteria
Exceeded?
R1
R2
R3
R4
55.0 46.9
38.5 34.1
L1
L2
L3
L4
61.3 54.0
61.3 54.3
62.2 54.8
61.3 54.3
0.9 0.8
0.0 0.0
5.0 5.0
5.0 5.0
No
No
No
No
' See Exhibit 6-1 for the receiver locations.
2 Total Project daytime operational noise levels as shown on Table 7-2. 3 Reference noise level measurement locations as shown on Exhibit 5-A. 4 Observed daytime ambient noise levels as shown on Table 5-1. 5 Represents the combined ambient conditions plus the Project activities. 6 The noise level increase expected with the addition of the proposed Project activities.
Significance increase criteria as shown on Table 4-1.
TABLE 7-7: EVENING OPERATIONAL NOISE LEVEL INCREASES
Receiver
Location'
Total Project
Operational
Noise LeveI2
Measurement
Location3
Reference
Ambient
Noise Levels4
Combined
Project
and
Ambient5
Project
Increase6
Increase
Criteria'
Increase
Criteria
Exceeded?
R1
R2
R3
R4
48.0 48.5
40.0 34.4
L1
L2
L3
L4
59.6 48.4
59.2 61.9
59.9 51.5
59.3 61.9
0.3 3.1
0.1 0.0
5.0 5.0
5.0 5.0
No
No
No
No
' See Exhibit 6-1 for the receiver locations.
2 Total Project evening operational noise levels as shown on Table 7-3.
Reference noise level measurement locations as shown on Exhibit 5-A.
Observed evening ambient noise levels as shown on Table 5-1.
Represents the combined ambient conditions plus the Project activities. 6 The noise level increase expected with the addition of the proposed Project activities. 7 Significance increase criteria as shown on Table 4-1. 16391-02 NA
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Howard World Wildlife Museum
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TABLE 7-8: NIGHTTIME OPERATIONAL NOISE LEVEL INCREASES
Receiver
Location'
Total Project
Operational
Noise Leven
Measurement
Location3
Reference
Ambient
Noise Levels4
Combined
Project
and
Ambient'
Project
Increase6
Increase
Criteria'
Increase
Criteria
Exceeded?
R1
R2
R3
R4
40.3 14.5
14.0 30.9
L1
L2
L3
L4
48.1 43.2
54.3 52.0
48.8 43.2
54.3 52.0
0.7 0.0
0.0 0.0
5.0 5.0
5.0 5.0
No
No
No
No
See Exhibit 6-1 for the receiver locations.
2 Total Project nighttime operational noise levels as shown on Table 7-4.
Reference noise level measurement locations as shown on Exhibit 5-A. ° Observed nighttime ambient noise levels as shown on Table 5-1. 5 Represents the combined ambient conditions plus the Project activities. 6 The noise level increase expected with the addition of the proposed Project activities.
Significance increase criteria as shown on Table 4-1.
7.7 OFF -SITE TRAFFIC NOISE ANALYSIS
Traffic generated by the operation of the proposed Project will influence the traffic noise levels in surrounding off -site areas and at the Project site. However, the off -site Project -related traffic represents an incremental increase to the existing roadway volumes, which is not expected to generate a barely perceptible noise level increase of 3 dBA CNEL at nearby sensitive land uses adjacent to study area roadways, since a doubling of the existing traffic volumes would be required to generate a 3 dBA CNEL increase. The Project is anticipated to generate approximately of 150 trips per day. The incremental Project -related off -site traffic noise levels due to the Howard World Wildlife Museum project trips are estimated at less than 1 dBA CNEL. Therefore, due to the low traffic volumes generated by the Project, the off -site traffic noise levels generated by the Project are considered less than significant and no further analysis is required. 16391-02 NA
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8 CONSTRUCTION IMPACTS
This section analyzes potential impacts resulting from the short-term construction activities associated with the development of the Project. Exhibit 8-1 shows the construction noise source locations in relation to the nearest sensitive receiver locations previously described in Section 6. To prevent high levels of construction noise from impacting noise -sensitive land uses, RMMC Section
15.04.030[A][11] indicates that construction, shall be limited to the hours of 7:00 a.m. and 7:00 p.m. with no activity on Sundays and holidays (12).
8.1 CONSTRUCTION NOISE LEVELS
The FTA Transit Noise and Vibration Impact Assessment Manual recognizes that construction projects are accomplished in several different stages and outlines the procedures for assessing noise impacts during construction. Each stage has a specific equipment mix, depending on the work to be completed during that stage. As a result of the equipment mix, each stage has its own noise characteristics; some stages have higher continuous noise levels than others, and some have higher impact noise levels than others. The Project construction activities are expected to occur in the following stages:
• Site Preparation
• Grading
• Building Construction
• Architectural Coating
• Paving
8.2 CONSTRUCTION REFERENCE NOISE LEVELS
To describe construction noise activities, this construction noise analysis was prepared using reference construction equipment noise levels from the Federal Highway Administration (FHWA) published the Roadway Construction Noise Model (RCNM), which includes a national database of construction equipment reference noise emission levels. (18) The RCNM equipment database provides a comprehensive list of the noise -generating characteristics of specific types of construction equipment. In addition, the database provides an acoustic usage factor to estimate the fraction of time each piece of construction equipment is operating at full power (i.e., its loudest condition) during a construction operation. According to the EPA, FTA, and FHWA, the overall construction noise level is governed primarily by the noisiest pieces of equipment. The quieter pieces do not affect the overall level, but they do reduce the magnitude of the fluctuations in the noise level.
Therefore, a rough estimate of the noise level needs only include the noisiest pieces of equipment expected at the site. (19) (8) (20) Consistent with FHWA and FTA guidance for detailed construction noise assessment, Table 8-1 presents the combined noise levels for the loudest construction activities expected for each stage, assuming all equipment operates simultaneously. 16391-02 NA
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Howard World Wildlife Museum
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EXHIBIT 8-1: CONSTRUCTION NOISE SOURCE LOCATIONS
LEGEND:
retA
Limits of Construction Activity lie Receiver Locations —lb Distance from receiver to construction activity (in feet) 16391-02 NA
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Howard World Wildlife Museum
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TABLE 8-1: CONSTRUCTION REFERENCE NOISE LEVELS
Construction
Stage
Reference
Construction Equipmnet'
Reference Noise
Level @ 50 Feet
(dBA Leq)
Composite
Reference Noise
Level
(dBA Leq)2
Reference
Power Le 3el
(dBA Lw)
Tractor
80 Site
Preparation
Backhoe
74 84.0
115.6
Grader
81 Scraper
80 Grading
Excavator
77 83.3
114.9
Dozer
78 Crane
73 Building
Construction
Tractor
80 81.1
112.8
Welder/Torch
70 Paver
74 Paving
Dump Truck
72 77.8
109.5
Roller
73 Man Lift
68 Architectural
Coating
Compressor (air)
74 79.8
111.4
Generator
78 FHWA Road Construction Noise Model.
Represents the combined noise level for all equipment assuming they operate at the same time.
The total amount of acoustical energy produced by a sound source independent of distance or surroundings.
8.3 CONSTRUCTION NOISE ANALYSIS
Construction projects involve various stages, and activities frequently shift from one location to another. For example, during site preparation and grading, noise -generating activities may concentrate in an area for a short period to remove an obstruction, while the majority of the grading involves the equipment moving back and forth in a predictable pattern throughout the site; building construction and foundation work generally concentrate near the building footprint, while paving generally involves a predictable pattern of movement throughout the site. Therefore, construction activities are best evaluated as multiple moving point sources within the construction area since the speed and power of the equipment vary, and the equipment constantly changes position in terms of its distance and direction relative to the receivers. (8) (21) Using the reference construction equipment noise levels and the CadnaA noise prediction model, calculations of the Project construction noise level impacts by phase at the nearby sensitive receiver locations were completed.
To account for the dynamic nature of construction activities, the CadnaA construction noise analysis evaluates the noise source activities as multiple moving point sources, or construction crews, within the limits of construction.
Construction impacts are based on the loudest activity and the highest noise level calculated at each receiver location. As shown on Table 8-2, the construction noise levels are expected to range from
56.8 to 73.2 dBA Leq at the nearby receiver locations. Appendix 8.1 includes the detailed CadnaA construction noise model inputs.
16391-02 NA
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Howard World Wildlife Museum
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TABLE 8-2: CONSTRUCTION EQUIPMENT NOISE LEVEL SUMMARY
Receiver
Location'
R1
R2
R3
R4
Site
Preparation
64.4 73.2
69.2 56.8
Construction Noise Levels (dBA Leq)
Grading
63.7 72.5
68.5 56.1
Building
Construction
61.5 70.3
66.3 53.9
Paving
58.3 67.1
63.1 50.7
Architectural
Coating
60.2 69.0
65.0 52.6
Highest
Levelsz
64.4 73.2
69.2 56.8
'Construction noise source and receiver locations are shown on Exhibit 8-1. 2 Construction noise level calculations based on distance from the construction activity, which is measured from the Project site boundary to the nearest receiver locations. CadnaA construction noise model inputs are included in Appendix 8.1.
8.4 PROJECT SITE CONSTRUCTION NOISE LEVEL COMPLIANCE
To evaluate whether the Project will generate potentially significant short-term noise levels at nearest receiver locations, a construction -related daytime noise level threshold of 80 dBA Leq is used as a reasonable threshold to assess the daytime construction noise level impacts. The construction noise analysis shows that the nearest receiver locations will satisfy the reasonable daytime 80 dBA Leq significance threshold during Project construction activities as shown on Table 8-3. Therefore, the noise impacts due to Project construction noise are considered less than significant at all receiver locations.
TABLE 8-3: CONSTRUCTION NOISE LEVEL COMPLIANCE
Receiver
Location'
Construction Noise Levels (dBA Leq)
Highest Construction
Noise Levelsz
Threshold3
Threshold
Exceeded?4
R1
R2
R3
R4
64.4 73.2
69.2 56.8
80 80
80 80
No
No
No
No
'Construction noise source and receiver locations are shown on Exhibit 8-1. 2 Highest construction noise level calculations based on distance from the construction noise source activity to the nearest receiver locations as shown on Table 8-2.
Construction noise level thresholds as shown on Table 4-1. 4 Do the estimated Project construction noise levels exceed the construction noise level threshold? 16391-02 NA
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Howard World Wildlife Museum
8.5 TEMPORARY CONSTRUCTION NOISE LEVEL INCREASES
To describe the temporary Project construction noise level contributions to the existing ambient noise environment, the Project construction noise levels were combined with the existing ambient noise levels measurements at the nearest off -site receiver locations. The difference between the combined Project -construction and ambient noise levels is used to describe the construction noise level contributions. Temporary noise level increases that would be experienced at sensitive receiver locations when Project construction -source noise is added to the ambient daytime conditions are presented on Table 8-4.
Consistent with Table B-1 of the RMMC, a temporary noise level increase of 20 dBA is considered a potentially significant impact. As indicated in Table 8-4, the Project will contribute construction noise increases ranging from 4.4 to 19.3 dBA Leq during the daytime hours at the nearest receiver locations.
The unmitigated construction noise analysis shows that the nearest receiver locations will not exceed the temporary 20 dBA Leq noise increase significance threshold during Project construction activities. Therefore, the temporary construction noise increase analysis shows that the noise impacts due to Project construction noise are considered less than significant.
TABLE 8-4: DAYTIME CONSTRUCTION NOISE LEVEL INCREASES
Typical
Reference
Combined
Increase
Receiver
Project
Measurement
Project
Project
Increase
Location'
Construction
Location3
Ambient
and
Increase6
Criteria'
Criteria
Noise Level2
Noise Levels°
Ambients
Exceeded?
R1
64.4 L1
61.3 66.1
4.8 20
No
R2
73.2 L2
54.0 73.3
19.3 20
No
R3
69.2 L3
61.3 69.9
8.6 20
No
R4
56.8 L4
54.3 58.7
4.4 20
No
'Construction noise source and receiver locations are shown on Exhibit 8-1.
Z Typical Project daytime construction noise levels as shown on Table 8-3.
Reference noise level measurement locations as shown on Exhibit 5-A.
Observed daytime ambient noise levels as shown on Table 5-1.
Represents the combined ambient conditions plus the Project construction activities. e The noise level increase expected with the addition of the proposed Project construction activities.
City of Rancho Mirage Municipal Code, Table B-1 (Appendix 3.1).
8.6 CONSTRUCTION VIBRATION ANALYSIS
Construction activity can result in varying degrees of ground vibration, depending on the equipment and methods employed. Operation of construction equipment causes ground vibrations that spread through the ground and diminish in strength with distance. Ground vibration levels associated with various types of construction equipment are summarized on Table 8-5. Based on the representative vibration levels presented for various construction equipment types, it is possible to estimate the potential for building damage using the following vibration assessment methods defined by the FTA.
To describe the vibration impacts the FTA provides the following equation:
PPVequip = PPVref x (25/D)1.5
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Howard World Wildlife Museum
TABLE 8-5: VIBRATION SOURCE LEVELS FOR CONSTRUCTION EQUIPMENT Equipment
PPV (in/sec)
at 25 feet
Small bulldozer
0.003
Jackhammer
0.035
Loaded Trucks
0.076
Large bulldozer
0.089
Vibratory Roller
0.210
Federal Transit Administration, Transit Noise and Vibration Impact Assessment Manual Using the vibration source level of construction equipment provided on Table 8-5 and the construction vibration assessment methodology published by the FTA, it is possible to estimate the Project vibration impacts. Table 8-6 presents the expected Project related vibration levels at the nearby receiver locations. At distances ranging from 28 to 750 feet from Project construction activities, construction vibration velocity levels are estimated to range from 0.001 to 0.177 PPV in/sec. Based on maximum acceptable continuous vibration threshold of 0.3 PPV (in/sec), the typical Project construction vibration levels will fall below the damage thresholds at all the receiver locations. Therefore, the Project -related vibration impacts are considered less than significant during typical construction activities at the Project site.
TABLE 8-6: PROJECT CONSTRUCTION VIBRATION LEVELS
Location'
Distance
to
Const.
Activity
(Feet) z
Typical Construction Vibration Levels
PPV (in/sec)3
Thresholds
PPV
(in/sec) a
Thresholds
Exceeded?5
Small
bulldozer
Jack
hammer
Loaded
Trucks
Large
bulldozer
Vibratory
Roller
Highest
Vibration
Level
R1
R2
R3
R4
137'
28'
99'
750'
0.000
0.003
0.000
0.000
0.003
0.030
0.004
0.000
0.006
0.064
0.010
0.000
0.007
0.075
0.011
0.001
0.016
0.177
0.027
0.001
0.016
0.177
0.027
0.001
0.3 0.3
0.3 0.3
No
No
No
No
'Construction noise source and receiver locations are shown on Exhibit 8-1. 2 Distance from receiver building facade to Project construction boundary (Project site boundary).
Based on the Vibration Source Levels of Construction Equipment (Table 8-5). 4Caltrans Transportation and Construction Vibration Guidance Manual, April 2020, Table 19, p. 38. s Does the peak vibration exceed the acceptable vibration thresholds? "PPV" = Peak Particle Velocity
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9 REFERENCES
1. Association of Environmental Professionals. California Environmental Quality Act Statute & Guidelines. 2023.
2. California Department of Transportation Environmental Program. Technical Noise Supplement - A Technical Supplement to the Traffic Noise Analysis Protocol. Sacramento, CA : s.n., September 2013.
3. Environmental Protection Agency Office of Noise Abatement and Control. Information on Levels of Environmental Noise Requisite to Protect Public Health and Welfare with an Adequate Margin of Safety.
March 1974. EPA/ONAC 550/9/74-004.
4. U.S. Department of Transportation, Federal Highway Administration, Office of Environment and Planning, Noise and Air Quality Branch. Highway Traffic Noise Analysis and Abatement Policy and Guidance. December 2011.
5. U.S. Department of Transportation Federal Highway Administration. Highway Noise Barrier Design Handbook. 2001.
6. U.S. Department of Transportation, Federal Highway Administration. HighwayTraffic Noise in the United States, Problem and Response. April 2000. p. 3.
7. U.S. Environmental Protection Agency Office of Noise Abatement and Control. Noise Effects Handbook - A Desk Reference to Health and Welfare Effects of Noise. October 1979 (revised July 1981). EPA 550/9/82/106.
8. U.S. Department of Transportation, Federal Transit Administration. Transit Noise and Vibration Impact Assessment Manual, FTA Report No. 0123. September 2018.
9. California Department of Transportation. Transportation and Construction Vibration Guidance Manual.
April 2020.
10. Office of Planning and Research. State of California General Plan Guidelines. October 2017.
11. City of Rancho Mirage. Municipal Code, Chapter 8.45 Noise.
12. —. Municipal Code, Sections 15.04.030.
13. —. General Plan Update Draft Environmental Impact Report. 2005.
14. California Court of Appeal. Gray v. County of Madera, F053661. 167 Cal.App.4th 1099; - Cal.Rptr.3d, October 2008.
15. Federal Interagency Committee on Noise. Federal Agency Review of Selected Airport Noise Analysis Issues.
August 1992.
16. California Department of Transportation. Technical Noise Supplement. November 2009.
17. American National Standards Institute (ANSI). Specification for Sound Level Meters ANSI S1.4-2014/IEC 61672-1:2013.
18. U.S. Department of Transportation, Federal Highway Administration, Office of Environment and Planning. FHWA Roadway Construction Noise Model. January, 2006.
19. U.S. Environmental Protection Agency. Noise from Construction Equipment and Operations, Building Equipment, and Home Appliances. 1971. NTID300.1.
20. U.S. Department of Transportation, Federal Highway Administration. Special Report - Measurement, Prediction, and Mitigation. Office of Planning, Environment, and Realty - Environment - Noise. [Online] 2017. https://www.fhwa.dot.gov/environment/noise/construction_noise/special_report/hcn00.cfm .
21. —. FHWA Highway Construction Noise Handbook. Final Report August 2006. 16391-02 NA
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10 CERTIFICATION
The contents of this noise study report represent an accurate depiction of the noise environment and impacts associated with the proposed Howard World Wildlife Museum Project. The information contained in this noise study report is based on the best available data at the time of preparation. If you have any questions, please contact me directly at (949) 584-3148.
Bill Lawson, P.E., INCE
Principal
URBAN CROSSROADS, INC.
1133 Camelback #8329
Newport Beach, CA 92658
(949) 581-3148
[email protected]
Education
Master of Science in Civil and Environmental Engineering California Polytechnic State University, San Luis Obispo • December, 1993 Bachelor of Science in City and Regional Planning
California Polytechnic State University, San Luis Obispo • June, 1992 Professional Registrations
PE — Registered Professional Traffic Engineer—TR 2537 • January, 2009 AICP —American Institute of Certified Planners — 013011 • June, 1997 January 1, 2012 PTP — Professional Transportation Planner • May, 2007 — May, 2013 INCE — Institute of Noise Control Engineering • March, 2004 Professional Affiliations
ASA —Acoustical Society of America
ITE — Institute ofTransportation Engineers
Professional Certifications
Certified Acoustical Consultant —County of San Diego • March, 2018 Certified Acoustical Consultant —County of Orange • February, 2011 FHWA-NHI-142051 Highway Traffic Noise Certificate of Training • February, 2013 16391-02 NA
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APPENDIX 3.1:
CITY OF RANCHO MIRAGE MUNICIPAL CODE
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City of Rancho Mirage, CA
§ 8.45.010
CHAPTER 8.45
NOISE
§ 8.45.030
§ 8.45.010. Purpose.
The city has established a quality of life and environment in which peace and quiet is highly valued by its residents, visitors and businesses. The existence of excessive noise within the city is a condition which is detrimental to the health, safety, comfort, welfare and quality of life of the citizenry and shall be regulated in the public interest. This chapter has been created to implement the goals and policies of the noise element of the city's general plan and to prohibit undesirable noises in the community. This chapter shall be referred to and cited as the Rancho Mirage noise ordinance.
(Ord. 633 § 1(Exh. A), 1995)
§ 8.45.020. Definitions.
"Ambient noise level" means the all encompassing noise level associated with a given environment, being a composite of sounds from all sources, excluding the alleged offensive noise, at the location and approximate time at which a comparison with the alleged offensive noise is to be made.
"Cumulative period" means an additive period of time consisting of individual time segments which may be continuous or interrupted.
"Decibel (dBA)" means a unit of sound level measured on a sound level meter using the A - weighting network.
"Emergency" means any occurrence or set of circumstances involving actual or imminent physical danger, crisis, trauma or property damage which demands immediate action. "Noise level" means the same as sound level the terms are interchangeable. "Person" means any individual, association, partnership, corporation, organization, or public agency, including associated officer(s), employee(s) or department(s). "Sound level" means the quantity of decibels measured using the frequency weighting of A of a sound level meter.
"Sound level meter" means an instrument meeting the American National Standards Institute's standard S 1.4-1983 or later revision, for Type 1 or Type 2 specifications; or an instrument and the associated recording and analyzing equipment which will provide equivalent data. (Ord. 633 § 1(Exh. A), 1995)
§ 8.45.030. Exterior noise level limits.
No person shall operate or cause to be operated any source of sound or allow the creation of sound or noise on property owned, leased, occupied or otherwise controlled by such person which causes the noise level, as measured on any other property, to exceed:
A. The noise level for the applicable zone specified in Table A-1 for a cumulative period of more than thirty minutes in any hour of the applicable time period.
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City of Rancho Mirage, CA
§ 8.45.030
B.
§ 8.45.040
Table A-1
Land Use/Zone Time of Day
Noise Level
(dBA)
Residential, Low Density (R -E, H -R, R -L-2,
R -L-3)
Residential, Medium and High Density,
Hospital, Open Space (OS, R -M, R -H, MHP)
Commercial Office, Resort Commercial,
Mixed Use, Institutional (O, P, Rs -H, M -U)
Commercial Neighborhood, General
Commercial, Commercial Recreation, Light
Industrial (C -N, C -G, I -L)
7:00 a.m. to 6:00 p.m.
6:00 p.m. to 10:00 p.m.
10:00 p.m. to 7:00 a.m.
7:00 a.m. to 6:00 p.m.
6:00 p.m. to 10:00 p.m.
10:00 p.m. to 7:00 a.m.
7:00 a.m. to 6:00 p.m.
6:00 p.m. to 10:00 p.m.
10:00 p.m. to 7:00 a.m.
7:00 a.m. to 6:00 p.m.
6:00 p.m. to 10:00 p.m.
10:00 p.m. to 7:00 a.m.
55 50
45 60
55 50
65 60
55 70
65 60
For cumulative periods of time less than thirty minutes in an hour, all the noise standards in Table A-1 are increased according to Table B-1.
Table B-1
Duration of Sound dBA Adjustment
15-30 minutes per hour
10-15 minutes per hour
5-10 minutes per hour
1-5 minutes per hour
Any period of time less than 1 minute per hour
+3
+5
+10
+15
+ 20
C. If the measured ambient noise level exceeds the dBA limits in Table A-1, the noise limits and their adjustments for the first three categories in Table B-1 shall be increased in five dBA increments as needed to encompass or reflect said ambient noise level. The maximum noise level under the last two categories in Table B-1 shall be increased, if necessary, only to equal the ambient noise level.
(Ord. 633 § 1(Exh. A), 1995; Ord. 1015 § 2, 2011)
§ 8.45.040. Noise level measurement.
A. The location selected for measuring exterior noise levels shall be at the point of the property line of the affected property nearest the alleged offending noise source. If possible, the ambient noise shall be measured at the same location along the property line.
B. If the measurement location is on a boundary between two different locations, the noise level Downloaded from https://ecode360.com/RA4993 on 2025-05-04 221 3
City of Rancho Mirage, CA
§ 8.45.040
§ 8.45.065
limit applicable to the lower noise zone shall apply.
C. Upon receipt of a complaint or a request to investigate, the code compliance officer, equipped with an American National Standards Institute Type 2 or better sound level meter, may investigate the complaint. The investigation shall consist of measurements and the gathering of data to adequately define the noise problem and shall include the following:
1. Type and measurement of noise source;
2. Location of noise source relative to complainant's or affected property;
3. Time period during which noise source is considered to be intrusive;
4. Total duration of noise levels measured;
5. Date(s) and time(s) of noise measurement survey.
(Ord. 633 § 1(Exh. A), 1995)
§ 8.45.050. Special provisions and exemptions.
The following activities and noise sources shall be exempted from the provisions of this chapter:
A. School bands, school athletic and other activities occurring on a school campus; B. Outdoor gatherings, dance, shows, entertainment for events authorized through the city's special events process;
C. Activities conducted in public parks and public playgrounds that are dependent upon such facilities for their operation;
D. Any emission of sound for purposes of alerting persons to an emergency or the general emission of sound during performance of emergency work; E. Construction, alteration, repair, grading or improvement of any building, structure, road or improvement to real property for which a permit has been issued by the city if said construction occurs within the allowable hours set forth in Section 15.04.030(A)(10); F. The operation of any equipment and machinery at any time within any zone by the city, its employees, or any agent or franchisee of the city in the course of performing maintenance, construction or trash collection.
(Ord. 633 § 1(Exh. A), 1995)
§ 8.45.060. Additional prohibition.
It is unlawful and a nuisance for any person to keep, maintain or permit upon any lot or parcel of land within the city under his or her control any animal, including any fowl, which by any sound or cry shall habitually disturb the peace and comfort of any person in the reasonable and comfortable enjoyment of life or property.
(Ord. 633 § 1(Exh. A), 1995)
§ 8.45.065. Landscape maintenance.
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City of Rancho Mirage, CA
§ 8.45.065
§ 8.45.080
A. It is unlawful and a public nuisance for any person to permit or perform for -hire landscape and non -emergency exterior hardscape maintenance activities such as, but not limited to, tree trimming, re -seeding, lawn mowing, leaf blowing, dust and debris clearing and any other landscaping or nonemergency exterior hardscape maintenance activities which utilize any motorized saw, sander, drill, grinder, leaf -blower, lawnmower, hedge trimmer, edger, or any other similar tool or device any time on Saturday and Sunday and between the hours of six p.m. and seven a.m. the next day during weekdays, unless otherwise provided in this section.
B. The regular mowing or grooming of golf courses, grass tennis courts, grass croquet courts, and lawn bowling areas shall be exempt from the restrictions set forth in this section. The allowed work hours for mowing or green preparation for golf courses, grass tennis courts, grass croquet courts, and lawn bowling areas shall be between five thirty a.m. and seven p.m., seven days per week and during all seasons of the year.
C. Nothing set forth in this section shall permit any person from engaging in any activities that exceed the exterior noise level limits set forth in Section 8.45.030 or otherwise constitute a public nuisance as set forth in Section 14.60.325 of the Municipal Code. (Ord. 936, § 3, 2006; Ord. 979, § 1, 2009)
§ 8.45.070. Administration.
The noise control program established by this chapter shall be administered by and is the responsibility of the code compliance division as directed by the director of the community development department.
(Ord. 633 § 1(Exh. A), 1995)
§ 8.45.080. Violations and enforcement procedures.
Violations of this chapter are declared to be a nuisance and subject to the procedures, remedies and penalties set forth in Title 14.
(Ord. 633 § 1(Exh. A), 1995; Ord. 916 § 4, 2006)
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APPENDIX 5.1:
STUDY AREA PHOTOS
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JN:16391
16391_Ll_A 1.North
33, 46' 2.950000", 116, 26' 37.770000"
16391_L1_A 2.5outh
33, 46' 2.870000", 116, 26' 37.820000"
16391_L1_A 3.East
33, 46' 2.950000", 116, 26' 37.690000"
16391_L1_A 4.West
33, 46' 2.970000", 116, 26' 37.710000"
2218
JN:16391
16391_L2_C 1.North
33, 45' 55.580000", 116, 26' 32.470000"
16391_12_C 2.5outh
33, 45' 55.550000", 116, 26' 32.410000"
16391_L2_C 3.East
33, 45' 55.440000", 116, 26' 32.470000"
16391_L2_C 4.West
33, 45' 55.430000", 116, 26' 32.500000"
2219
JN:16391
16391_L3_E 1.North
33, 45' 53.350000", 116, 26' 34.580000"
16391_L3_E 2.5outh
33, 45' 53.310000", 116, 26' 34.560000"
16391_L3_E 3.East
33, 45' 53.340000", 116, 26' 34.560000"
16391_13_E 4.West
33, 45' 53.340000", 116, 26' 34.580000"
2220
JN:16391
16391_L4_H 1.North
33, 45' 50.760000", 116, 26' 42.360000"
16391_14_H 2.5outh
33, 45' 50.700000", 116, 26' 42.380000"
16391_14_H 3.East
33, 45' 50.720000", 116, 26' 42.330000"
16391_14_H 4.West
33, 45' 50.590000", 116, 26' 42.580000"
2221
JN:16391
16391_L5_F 1.North
33, 45' 54.510000", 116, 26' 34.940000"
16391_15_F 2.5outh
33, 45' 54.480000", 116, 26' 34.890000"
16391_L5_F 3.East
33, 45' 54.340000", 116, 26' 34.910000"
16391_L5_F 4.West
33, 45' 54.350000", 116, 26' 34.890000"
2222
JN:16391
16391_16_G 1.North
33, 45' 59.330000", 116, 26' 38.240000"
16391_16_G 2.5outh
33, 45' 59.230000", 116, 26' 38.210000"
16391_L6_G 3.East
33, 45' 59.110000", 116, 26' 38.210000"
16391_L6_G 4.West
33, 45' 59.110000", 116, 26' 38.240000"
2223
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APPENDIX 5.2:
NOISE LEVEL MEASUREMENT WORKSHEETS
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24 -Hour Noise Level Measurement Summary
I Date: Tuesday, April 29, 2025
Project: Howard Wildlife Museum
Location: L1 - Located north of the site within the Desert Braemar Source: community near the residence at 69850 CA -111
Meter: Piccolo II
IN: 16391
Analyst: Z. Ibrahim
Hourly L e, dBA Readings (unadjusted)
85.0 80.0
75.0 -o 70.0
65.0 60.0
- 55.0
50.0 o 45.0
= 40.0
35.0 tO
ii%iii
0 n
�M
- 0
U,
a
o
m
`o
-
w
--
wj
m
u+ -m
ti
m
,o
N
0 a1
N
o
r
N -
is
v
Ln
v
ai
cr
o
N
of
o
`t
uS
.4
•
to,
et
m
-`n
is
.4.
ri
-
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Hour Beginning
Timeframe Hour Leq L mnx L mm L7% L2% L5% L8% L25% L50% L90% L95% L99% Leq Adj. Adj. Leq Night
0 1
2 3
4 5
39.1 40.0
36.9 41.2
45.0 53.1
54.1 44.4
46.7 42.1
47.5 50.4
60.8 60.6
35.3 36.2
34.9 37.5
42.4 44.5
46.7 44.2
46.5 41.9
47.2 50.1
60.2 60.1
43.9 46.1
41.6 46.9
49.7 59.8
59.9 43.0
44.6 40.3
45.3 48.4
58.8 58.9
42.2 43.3
39.5 44.6
47.4 58.2
58.0 39.6
40.3 36.8
41.7 45.4
54.6 54.6
38.1 38.6
36.0 39.5
44.1 48.9
52.6 36.1
36.7 35.2
38.1 42.9
45.3 49.1
35.7 36.5
35.1 37.8
42.7 44.9
48.5 35.4
36.3 35.0
37.6 42.5
44.6 47.0
39.1 40.0
36.9 41.2
45.0 53.1
54.1 10.0
10.0 10.0
10.0 10.0
10.0 10.0
49.1 50.0
46.9 51.2
55.0 63.1
64.1 Day
7 8
9 10
11 12
13 14
15 16
17 57.1
66.5 56.5
58.4 63.2
60.9 53.8
52.1 53.3
60.7 64.2
65.2 74.1
63.5 65.5
73.3 71.3
63.8 61.0
63.1 70.0
72.9 48.7
55.4 49.3
51.5 52.2
50.6 47.2
46.2 46.8
53.6 56.2
63.9 73.8
62.4 64.4
71.6 69.6
63.2 60.4
62.0 68.7
71.3 63.1
73.5 61.7
63.6 70.5
68.4 62.4
59.6 60.7
67.6 70.2
61.8 72.3
60.4 62.4
68.6 66.2
59.9 57.3
58.6 65.2
68.5 61.0
71.2 59.7
61.6 67.5
65.1 58.2
55.9 57.1
64.0 67.6
57.9 67.7
57.4 59.4
63.9 61.4
52.7 52.1
53.5 61.0
64.9 55.5
62.6 55.4
57.4 60.6
58.2 50.3
49.8 50.7
59.0 62.7
51.3 57.6
51.9 54.0
55.4 53.5
48.2 47.3
48.0 55.8
59.0 50.3
56.9 51.0
53.2 54.3
52.6 47.8
46.8 47.5
55.1 58.1
49.2 55.6
49.9 52.2
52.8 51.2
47.3 46.3
47.0 54.2
56.9 57.1
66.5 56.5
58.4 63.2
60.9 53.8
52.1 53.3
60.7 64.2
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 57.1
66.5 56.5
58.4 63.2
60.9 53.8
52.1 53.3
60.7 64.2
Evening
18 19
20 21
63.6 63.7
54.6 49.4
72.6 73.7
64.2 60.1
55.6 53.9
46.5 42.9
70.9 72.0
62.6 59.5
69.7 70.7
61.5 58.9
67.9 68.8
59.8 56.7
67.0 67.6
58.8 53.5
64.3 64.3
55.3 47.5
62.1 61.5
52.1 45.7
58.3 57.0
48.2 43.7
57.5 56.0
47.5 43.4
56.3 54.7
46.8 43.1
63.6 63.7
54.6 49.4
0.0 5.0
5.0 5.0
63.6 68.7
59.6 54.4
Night
Timeframe
22 23
Hour
46.0 41.1
Lea
52.1 55.8
50.6 L mox
61.0 38.4
35.7 L min
46.2 55.5
50.3 LI%
55.1 49.9
L2%
53.5 47.8
L5%
51.0 45.5
L8%
44.7 39.9
L25%
41.8 37.9
L50%
39.0 36.2
L90%
38.7 36.0
L95%
38.4 46.0
35.8 41.1
L99%
Day
Min
Max
66.5 74.1
56.2 60.4
73.8 59.6
73.5 57.3
72.3 55.9
71.2 52.1
67.7 49.8
62.7 47.3
59.0 46.8
58.1 46.3
56.9 Energy Average
61.0 Average:
60.1 66.5
65.6 63.7
62.6 59.3
56.6 52.9
52.2 51.2
Evening
Min
Max
49.4 63.7
73.7 42.9
55.6 59.5
72.0 58.9
70.7 56.7
68.8 53.5
67.6 47.5
64.3 45.7
62.1 43.7
58.3 43.4
57.5 43.1
56.3 Energy Average
61.0 Average:
66.3 65.2
63.3 61.7
57.8 55.3
51.8 51.1
50.2 Night
Min
Max
36.9 54.1
42.1 60.8
34.9 46.7
Average:
41.9 60.2
41.6 59.9
40.3 58.9
39.5 58.2
36.8 54.6
36.0 52.6
35.2 49.1
35.1 48.5
35.0 47.0
Energy Average
48.1 50.7
50.3 49.0
47.7 44.2
42.0 39.9
39.6 39.2
10.0 10.0
56.0 51.1
Leq (dBA)
Daytime Evening Nighttime
(7am-7pm) (7pm-10pm) (10pm-7am)
61.0 61.0 48.1
24 -Hour
61.1 Z:\Shared\UciobsL16100-16500L16300\16391\04 Noise\Fieldwork\measurements\16391_L1_A_DEN 2226 0 CROSSROADS
URBAN
24 -Hour Noise Level Measurement Summary
I Date: Tuesday, April 29, 2025
Project: Howard Wildlife Museum
Location: L2 - Located east of the site near the residence at 70100 Source: Mirage Cove Drive.
Meter: Piccolo II
IN: 16391
Analyst: Z. Ibrahim
Hourly L dBA Readings (unadjusted)
85.0 80.0
75.0 v 70.0
65.0 60.0
- 55.0
50.0 o 45.0
= 40.0
35.0 in
v
N
m 00
N �_
I
.4
1 N
en
CO
m
ut
M
ai
j
®
ao
a
N
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Hour Beginning
Timeframe
Night
Hour
0 1
2 3
4 5
6 L eq
37.4 38.3
35.3 39.4
42.7 46.3
48.9 L max
42.7 44.4
40.2 47.4
47.7 52.3
55.1 L min
33.4 34.0
33.1 35.1
39.7 43.0
44.8 Ll%
42.4 44.1
39.9 47.1
47.3 51.9
54.5 L2%
42.1 43.7
39.5 46.5
46.8 51.4
53.9 L5%
41.3 42.5
38.4 44.7
45.5 50.0
52.7 L8%
40.4 41.6
37.5 43.3
44.9 49.0
51.9 L25%
38.2 39.0
35.6 39.4
43.3 46.5
49.5 L50%
36.5 36.9
34.6 37.3
42.1 45.4
48.0 L90%
34.2 34.7
33.5 35.7
40.4 43.7
45.7 L95%
33.8 34.5
33.4 35.5
40.1 43.4
45.3 L99%
33.5 34.1
33.1 35.2
39.8 43.1
44.9 L eq
37.4 38.3
35.3 39.4
42.7 46.3
48.9 Adj.
10.0 10.0
10.0 10.0
10.0 10.0
10.0 Adj. Leq
47.4 48.3
45.3 49.4
52.7 56.3
58.9 Day
7 8
9 10
11 12
13 14
15 16
17 53.6
54.5 51.3
50.4 54.3
54.2 58.8
51.8 55.1
51.2 48.7
65.2 60.2
60.4 59.7
65.3 58.6
69.6 61.2
65.6 58.7
55.1 44.8
51.2 43.8
45.0 44.4
49.7 46.5
44.5 44.2
46.4 44.3
64.1 59.3
59.5 58.7
64.5 58.2
69.0 60.4
64.7 57.7
54.5 63.0
58.4 58.9
58.0 63.7
57.8 68.2
59.7 63.7
56.9 53.8
60.1 57.1
57.1 55.4
61.4 57.2
66.6 57.5
61.9 55.1
52.5 58.4
56.6 56.1
53.4 58.9
56.8 65.2
55.9 60.6
54.3 51.6
52.2 55.2
51.2 50.3
53.5 55.3
54.5 51.9
54.6 51.8
49.4 49.2
54.0 48.4
48.7 49.4
53.8 50.0
48.9 49.6
50.1 47.6
46.1 52.0
45.3 46.4
46.1 50.7
47.5 45.8
45.4 47.7
45.6 45.6
51.7 44.8
45.9 45.5
50.3 47.1
45.3 45.0
47.3 45.1
45.0 51.4
44.2 45.3
44.7 49.8
46.7 44.7
44.4 46.7
44.5 53.6
54.5 51.3
50.4 54.3
54.2 58.8
51.8 55.1
51.2 48.7
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 53.6
54.5 51.3
50.4 54.3
54.2 58.8
51.8 55.1
51.2 48.7
Evening
18 19
20 21
54.7 50.1
48.4 45.3
63.9 57.7
56.9 51.8
46.1 46.2
43.4 41.5
63.1 56.9
56.0 51.4
62.5 56.2
54.9 50.9
61.2 54.0
52.7 49.4
60.0 52.8
51.5 48.0
54.7 50.3
48.7 45.6
50.3 49.0
46.7 44.3
47.5 47.2
44.4 42.4
47.0 46.9
44.0 41.9
46.4 46.4
43.5 41.6
54.7 50.1
48.4 45.3
0.0 5.0
5.0 5.0
54.7 55.1
53.4 50.3
Night
Timeframe
22 23
Hour
42.2 37.2
Lee
48.7 51.6
46.6 L max
55.1 36.1
32.0 L mix
43.8 51.0
46.1 LI%
50.0 45.2
L2%
47.8 42.9
L5%
46.6 40.9
L8%
42.1 36.8
L25%
39.2 34.6
L50%
36.8 32.6
L90%
36.5 32.3
L95%
36.2 32.1
L99%
Day
Min
Max
58.8 69.6
51.2 54.5
69.0 53.8
68.2 52.5
66.6 51.6
65.2 49.4
55.3 47.6
54.0 45.3
52.0 44.8
51.7 44.2
51.4 Energy Average
53.9 Average:
51.8 61.0
60.2 58.3
57.1 52.7
50.0 47.2
46.7 46.1
Evening
Min
Max
45.3 54.7
63.9 41.5
46.2 Average:
51.4 63.1
50.9 62.5
49.4 61.2
48.0 60.0
45.6 54.7
44.3 50.3
42.4 47.5
41.9 47.0
41.6 46.4
Energy Average
51.0 56.9
56.1 54.3
53.1 49.9
47.6 45.4
44.9 44.5
Night
Min
Max
Energy Average
35.3 48.9
43.2 40.2
55.1 32.0
44.8 Average:
39.9 54.5
47.1 39.5
53.9 46.6
38.4 52.7
45.1 37.5
51.9 44.0
35.6 49.5
41.2 34.6
48.0 39.4
32.6 45.7
37.5 32.3
45.3 37.2
32.1 44.9
36.9 42.2
37.2 10.0
10.0 52.2
47.2 Leq (dBA)
Daytime Evening Nighttime
(7am-7pm) (7pm-10pm) (10pm-7am)
51.0 53.9 43.2
24 -Hour
53.6 Z:\Shared\UciobsL16100-16500216300\16391\04 Noise\Fieldwork\measurements\16391_L2 C DEN 2227 0 CROSSROADS
URBAN
24 -Hour Noise Level Measurement Summary
I Date: Tuesday, April 29, 2025
Project: Howard Wildlife Museum
Location: L3 - Located south of the site near the residence at 1 E the Source: Palms St.
Meter: Piccolo II
IN: 16391
Analyst: Z. Ibrahim
Hourly L e, dBA Readings (unadjusted)
85.0 80.0
75.0 -o 70.0
65.0 60.0
- 55.0
50.0 o 45.0
= 40.0
35.0 c
N
N
N
H
H
i
in
m
m
W
W
pp
t
to
m
!---
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Hour Beginning
Timeframe
Night
Hour
0 1
2 3
4 5
6 L eq
48.2 48.5
43.4 48.1
55.7 55.4
59.9 L max
61.1 61.9
56.1 59.8
69.5 65.2
69.5 L min
34.0 35.7
33.4 37.1
41.3 45.5
47.9 60.4
61.2 55.7
59.3 68.6
64.8 69.0
L2%
59.2 60.0
54.8 58.5
67.9 64.3
68.4 L5%
55.5 56.1
50.9 55.4
62.4 62.3
66.7 L8%
53.1 52.8
47.9 52.7
58.3 60.2
65.2 L25%
45.0 43.7
38.4 45.8
51.8 55.1
59.8 L50%
38.7 39.1
35.1 42.2
46.8 51.0
55.7 L90%
35.1 36.6
33.8 37.9
42.1 47.0
49.9 L95%
34.7 36.3
33.7 37.6
41.7 46.3
49.0 L99%
34.1 35.9
33.5 37.2
41.4 45.7
48.0 L eq
48.2 48.5
43.4 48.1
55.7 55.4
59.9 Adj.
10.0 10.0
10.0 10.0
10.0 10.0
10.0 Adj. L eq
58.2 58.5
53.4 58.1
65.7 65.4
69.9 Day
7 8
9 10
11 12
13 14
15 16
17 63.8
62.7 61.5
60.2 60.1
60.5 60.3
60.8 59.8
61.5 61.3
73.3 70.7
73.0 68.7
69.7 70.5
69.2 69.7
67.1 69.2
69.5 54.1
53.7 50.7
50.0 49.2
49.3 49.4
50.9 49.1
52.1 52.6
72.6 70.4
72.2 68.2
69.2 70.0
68.8 69.2
66.7 68.6
68.9 71.9
70.0 70.9
67.6 68.5
69.3 68.0
68.3 66.2
68.1 68.0
69.9 68.3
67.4 66.1
66.6 66.6
65.7 66.3
64.7 66.5
65.9 67.9
66.6 65.2
65.0 64.7
64.8 64.2
64.9 63.8
65.3 64.7
63.8 63.2
61.0 60.9
60.1 60.5
61.0 61.2
61.1 62.4
62.1 61.1
60.9 57.9
57.0 56.6
57.1 58.0
58.5 58.0
59.8 59.8
56.7 56.6
53.1 52.2
51.5 51.5
52.2 53.4
52.0 54.7
55.4 55.6
55.5 52.2
51.4 50.5
50.5 51.1
52.4 50.7
53.5 54.2
54.4 54.1
51.1 50.4
49.5 49.6
49.8 51.2
49.4 52.4
53.0 63.8
62.7 61.5
60.2 60.1
60.5 60.3
60.8 59.8
61.5 61.3
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 63.8
62.7 61.5
60.2 60.1
60.5 60.3
60.8 59.8
61.5 61.3
Evening
18 19
20 21
61.2 60.6
58.7 58.0
68.1 69.6
67.9 69.0
52.4 50.6
46.7 43.4
67.6 68.9
67.5 68.6
67.0 68.3
67.0 67.8
65.7 66.0
64.9 65.3
65.0 64.6
63.2 63.2
62.3 61.1
59.3 57.2
59.7 58.1
55.4 52.0
55.0 53.3
49.0 45.0
54.0 52.2
47.8 44.2
52.9 51.1
47.0 43.5
61.2 60.6
58.7 58.0
0.0 5.0
5.0 5.0
61.2 65.6
63.7 63.0
Night
Timeframe
22 23
Hour
55.0 52.1
Lae
59.8 65.5
63.7 L max
67.1 38.7
33.8 L min
49.1 65.0
63.3 LI%
64.2 62.7
L2%
62.2 60.2
L5%
60.8 57.6
L8%
54.5 49.4
L25%
47.8 41.3
L50%
40.0 34.8
L90%
39.3 34.3
L95%
38.8 33.9
L99%
Day
Min
Max
63.8 73.3
54.1 66.7
72.6 66.2
71.9 64.7
69.9 63.8
67.9 60.1
63.8 56.6
61.1 51.5
56.7 50.5
55.6 49.4
54.4 Energy Average
61.3 Average:
67.9 69.5
68.8 66.7
65.2 61.6
58.6 53.6
52.5 51.4
Evening
Min
Max
58.0 61.2
69.6 43.4
52.4 67.5
68.9 67.0
68.3 64.9
66.0 63.2
65.0 57.2
62.3 52.0
59.7 45.0
55.0 44.2
54.0 43.5
52.9 Energy Average
59.8 Average:
68.1 67.5
65.5 64.0
60.0 56.3
50.6 49.6
48.6 Night
Min
Max
Energy Average
43.4 59.9
54.3 56.1
69.5 33.4
47.9 Average:
55.7 69.0
63.0 54.8
68.4 62.2
50.9 66.7
59.1 47.9
65.2 56.5
38.4 59.8
49.3 35.1
55.7 44.2
33.8 49.9
39.7 33.7
49.0 39.2
33.5 48.0
38.7 55.0
52.1 10.0
10.0 65.0
62.1 Leq (dBA)
Daytime Evening Nighttime
(7am-7pm) (7pm-10pm) (10pm-7am)
59.8 61.3 54.3
24 -Hour
63.0 Z:\Shared\UciobsL16100-16500L16300\16391\04 Noise\Fieldwork\measurements\16391_L3 E DEN 2228 0 CROSSROADS
URBAN
24 -Hour Noise Level Measurement Summary
I Date: Tuesday, April 29, 2025
Project: Howard Wildlife Museum
Location: L4 - Located southwest of the site near the residence at 8 Vista Source: Loma Dr.
Meter: Piccolo II
JN: 16391
Analyst: Z. Ibrahim
Hourly L dBA Readings (unadjusted)
85.0 80.0
75.0 v 70.0
0-65.0
60.0 a 55.0
50.0 o 45.0
= 40.0
35.0 Tr
r
in
�'
L.n
00 to
-
M
r 1
in
0 00
a-
-. -
tD
m
in -
o
oo
00 ill
in
-
o f
in
00 0o
- C
n
V
00 Vq
ri
in
N
o
O
to -
a1
'{_
G
w
00 V
to
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Hour Beginning
Timeframe
Night
Hour
0 1
2 3
4 5
6 L e0
48.8 46.7
44.4 48.8
52.4 56.0
57.4 L max
57.1 55.5
53.5 57.5
60.3 62.3
61.9 L min
38.3 36.7
35.2 37.0
42.6 48.9
51.6 Ll%
56.7 55.0
53.0 57.2
59.9 61.9
61.6 L2%
56.2 54.5
52.5 56.6
59.4 61.5
61.3 L5%
54.5 53.2
50.4 55.3
58.1 60.3
60.8 L8%
53.3 52.0
49.2 54.1
57.1 59.4
60.3 L25%
49.8 46.9
44.8 49.3
53.3 57.3
58.7 L50%
46.0 42.3
40.7 44.2
49.5 54.8
56.7 L90%
39.6 37.8
36.0 38.6
44.7 50.6
53.0 L95%
38.9 37.3
35.6 37.8
43.9 50.0
52.4 L99%
38.4 36.8
35.3 37.1
42.9 49.1
51.7 L e9
48.8 46.7
44.4 48.8
52.4 56.0
57.4 Adj.
10.0 10.0
10.0 10.0
10.0 10.0
10.0 Adj. L eq
58.8 56.7
54.4 58.8
62.4 66.0
67.4 Day
7 8
9 10
11 12
13 14
15 16
17 56.4
58.1 52.3
54.8 53.6
50.8 55.8
53.0 51.2
50.0 54.0
61.7 63.7
56.5 65.4
58.8 57.5
64.2 60.6
57.6 55.2
63.2 50.5
53.3 47.6
48.5 48.8
45.7 46.8
46.0 45.7
44.9 46.7
61.1 63.3
56.2 64.6
58.3 57.0
63.7 59.7
57.2 54.8
62.4 60.8
62.9 55.9
63.4 57.8
56.6 63.0
58.9 56.7
54.5 61.6
60.1 61.7
55.4 59.3
56.6 55.3
62.2 57.6
55.4 53.7
59.2 59.5
61.2 55.0
57.2 56.1
54.4 61.1
56.9 54.6
53.0 57.8
57.7 58.9
53.4 54.3
54.5 51.5
56.1 53.9
52.2 51.1
54.1 55.8
57.5 51.7
52.8 53.1
49.4 51.7
51.3 49.7
49.3 51.7
51.8 54.8
48.8 50.0
50.2 46.8
48.0 47.2
46.7 45.9
48.2 51.2
54.2 48.3
49.4 49.6
46.3 47.4
46.7 46.3
45.6 47.6
50.6 53.6
47.7 48.7
49.0 45.9
46.9 46.2
45.8 45.1
46.9 56.4
58.1 52.3
54.8 53.6
50.8 55.8
53.0 51.2
50.0 54.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 56.4
58.1 52.3
54.8 53.6
50.8 55.8
53.0 51.2
50.0 54.0
Evening
18 19
20 21
53.9 52.8
52.3 50.4
59.2 59.0
57.1 55.2
47.9 47.7
47.2 45.0
58.9 58.4
56.8 54.8
58.6 57.8
56.6 54.5
58.0 56.4
55.8 53.9
57.6 55.5
55.1 53.4
55.2 53.7
53.5 51.6
52.2 52.0
51.4 49.6
49.1 49.1
48.3 46.2
48.5 48.4
47.8 45.7
48.1 47.8
47.4 45.2
53.9 52.8
52.3 50.4
0.0 5.0
5.0 5.0
53.9 57.8
57.3 55.4
Night
Timeframe
22 23
Hour
47.4 45.0
L ea
50.0 54.1
50.6 40.9
38.8 53.6
50.1 LI%
53.1 49.6
L2%
51.8 48.7
L5%
50.5 48.2
L8%
48.5 46.3
L25%
46.2 43.9
L50%
42.3 40.2
L90%
41.6 39.5
L95%
41.1 39.0
L99%
Day
Min
Max
58.1 55.2
65.4 44.9
53.3 54.8
64.6 54.5
63.4 53.7
62.2 53.0
61.2 51.1
58.9 49.3
57.5 45.9
54.8 45.6
54.2 45.1
53.6 Energy Average
54.3 Average:
55.2 59.8
59.3 57.9
57.0 54.3
52.2 48.9
48.4 47.9
Evening
Min
Max
50.4 53.9
59.2 45.0
47.9 Average:
54.8 58.9
54.5 58.6
53.9 58.0
53.4 57.6
51.6 55.2
49.6 52.2
46.2 49.1
45.7 48.5
45.2 48.1
Energy Average
52.5 57.2
56.9 56.0
55.4 53.5
51.3 48.2
47.6 47.1
Night
Min
Max
Energy Average
44.4 57.4
52.0 50.6
62.3 35.2
51.6 Average:
50.1 61.9
56.6 49.6
61.5 56.1
48.7 60.8
54.8 48.2
60.3 53.8
44.8 58.7
50.5 40.7
56.7 47.1
36.0 53.0
42.5 35.6
52.4 41.9
35.3 51.7
41.3 47.4
45.0 10.0
10.0 57.4
55.0 Leq (dBA)
Daytime Evening Nighttime
(7am-7pm) (7pm-10pm) (10pm-7am)
52.5 54.3 52.0
24 -Hour
59.0 Z:\Shared\UcJobsL16100-16500L16300116391\04 Noise lFieldwork\measurements\16391_L4 H DEN 2229 0 CROSSRO ,I S
URBAN
24 -Hour Noise Level Measurement Summary
I Date: Tuesday, April 29, 2025
Project: Howard Wildlife Museum
Location: L5 - Located within the site near the residence at 70100 Source: Mirage Cove Dr.
Meter: Piccolo II
IN: 16391
Analyst: Z. Ibrahim
Hourly L e, dBA Readings (unadjusted)
85.0 80.0
m 75.0
v 70.0
65.0 60.0
- 55.0
50.0 o 45.0
= 40.0
35.0 nr-
68.2 r -
T
N
.
. __I
I__
l
l0
O
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Hour Beginning
Timeframe Hour Leq L mnx L mm Li% L2% L5% L8% L25% L50% L90% L95% L99% Leq Adj. Adj. Leq Night
0 1
2 3
4 5
48.0 48.9
43.8 47.4
52.7 55.2
60.2 59.5
61.3 55.7
58.2 65.7
64.7 69.8
34.5 35.5
33.9 37.1
41.3 46.3
48.8 59.2
60.8 55.3
57.8 64.7
64.3 69.3
58.4 59.9
54.6 56.9
63.8 63.8
68.9 56.2
57.0 52.3
54.7 60.1
62.1 67.2
53.9 54.1
49.4 52.9
56.8 60.2
65.2 44.4
44.6 38.7
45.4 49.5
54.9 59.7
39.0 39.3
35.6 41.3
45.8 51.0
56.1 35.5
36.5 34.3
38.2 42.0
47.4 50.6
34.9 36.1
34.1 37.8
41.6 47.0
49.7 34.6
35.6 34.0
37.3 41.3
46.5 48.9
48.0 48.9
43.8 47.4
52.7 55.2
60.2 10.0
10.0 10.0
10.0 10.0
10.0 10.0
58.0 58.9
53.8 57.4
62.7 65.2
70.2 Day
7 8
9 10
11 12
13 14
15 16
17 68.2
64.1 61.8
62.7 62.2
60.7 60.3
60.5 60.0
61.6 64.0
79.0 71.2
70.2 69.9
71.9 70.7
68.8 69.3
67.6 68.7
71.7 56.3
56.0 53.8
54.6 51.8
49.9 49.9
51.0 50.2
54.5 57.0
78.7 70.3
69.4 69.3
71.3 70.0
68.3 68.8
67.2 68.2
70.9 78.5
69.7 68.5
68.6 70.9
69.1 67.6
68.0 66.5
67.6 70.0
76.7 68.4
66.6 67.5
69.2 67.0
65.8 66.2
65.1 65.9
67.9 73.1
67.5 65.4
66.7 66.2
64.6 64.2
64.9 63.9
64.7 66.9
65.3 65.0
62.4 63.4
61.7 60.7
61.0 60.6
61.1 62.3
64.7 63.1
63.0 60.3
61.0 58.8
57.9 58.3
58.2 58.3
60.4 63.0
59.1 59.0
56.5 57.2
54.3 52.5
52.5 53.4
52.7 56.9
59.6 58.2
57.8 55.5
56.4 53.3
51.4 51.5
52.3 51.6
56.0 58.7
56.9 56.5
54.3 55.2
52.2 50.3
50.2 51.3
50.5 55.0
57.6 68.2
64.1 61.8
62.7 62.2
60.7 60.3
60.5 60.0
61.6 64.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 68.2
64.1 61.8
62.7 62.2
60.7 60.3
60.5 60.0
61.6 64.0
Evening
18 19
20 21
63.1 64.6
58.3 56.6
70.3 75.9
66.2 65.9
56.3 54.5
48.3 44.3
69.2 75.2
65.9 65.6
68.4 74.0
65.4 65.0
66.9 71.0
64.1 63.2
66.1 67.8
62.6 61.8
64.1 63.6
59.2 56.9
62.2 61.2
55.9 52.3
58.6 57.4
50.5 45.7
57.8 56.4
49.6 44.9
56.9 55.2
48.6 44.4
63.1 64.6
58.3 56.6
0.0 5.0
5.0 5.0
63.1 69.6
63.3 61.6
Night
Timeframe
22 23
Hour
54.8 51.7
L eq
60.0 65.6
62.8 L mox
67.6 38.7
34.2 L min
49.9 65.0
62.3 LI%
64.0 61.7
L2%
62.0 59.6
L5%
60.3 57.6
L8%
54.6 49.9
L25%
48.2 41.8
L50%
40.0 35.2
L90%
39.3 34.7
L95%
38.8 54.8
34.3 51.7
L99%
Day
Min
Max
68.2 79.0
57.0 67.2
78.7 66.5
78.5 65.1
76.7 63.9
73.1 60.6
65.3 57.9
63.1 52.5
59.6 51.4
58.7 50.2
57.6 Energy Average
63.1 Average:
65.9 70.2
69.5 67.8
66.2 62.6
60.2 55.8
54.8 53.6
Evening
Min
Max
56.6 64.6
75.9 44.3
56.3 65.6
75.2 65.0
74.0 63.2
71.0 61.8
67.8 56.9
64.1 52.3
62.2 45.7
58.6 44.9
57.8 44.4
56.9 Energy Average
61.8 Average:
69.0 68.2
66.3 64.6
60.9 57.9
53.1 52.2
51.2 Night
Min
Max
43.8 60.2
55.7 69.8
33.9 48.8
Average:
55.3 69.3
54.6 68.9
52.3 67.2
49.4 65.2
38.7 59.7
35.6 56.1
34.3 50.6
34.1 49.7
34.0 48.9
10.0 10.0
64.8 61.7
Leq (d8A)
Daytime Evening Nighttime
(7am-7pm) (7pm-10pm) (10pm-7am)
61.8 63.1 54.0
24 -Hour
64.0 Energy Average
54.0 62.1
61.3 59.0
56.7 49.1 44.2
40.0 39.5
39.0 Z:\Shared\UciobsL16100-16500L16300\16391\04 Noise\Fieldwork\measurements\16391_LS F DEN 2280 0 CROSSROADS
URBAN
24 -Hour Noise Level Measurement Summary
I Date: Tuesday, April 29, 2025
Project: Howard Wildlife Museum
Location:
L6 - Located within the site.
Source:
Meter: Piccolo II
IN: 16391
Analyst: Z. Ibrahim
Hourly L dBA Readings (unadjusted)
85.0 80.0
75.0 v 70.0
65.0 60.0
> 55.0
50.0 o 45.0
= 40.0
35.0 �o
-
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Jro Lo
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in
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in
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Ln
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0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Hour Beginning
Timeframe Hour Leq L mnx L mm L7% L2% L5% L8% L25% L50% L90% L95% L99% Leq Adj. Adj. Leq Night
0 1
2 3
4 5
54.7 51.4
50.1 53.4
56.8 60.4
63.0 63.6
60.8 59.7
62.4 64.1
66.5 68.6
42.2 39.6
38.1 42.3
47.1 52.9
55.7 63.1
60.3 59.3
62.0 63.8
66.2 68.3
62.3 59.6
58.5 61.4
63.2 65.7
67.8 60.5
57.6 56.3
59.6 61.8
64.5 66.9
59.4 56.2
54.9 58.2
61.0 63.8
66.2 55.6
52.2 50.7
54.0 58.1
61.7 64.3
51.6 47.5
46.1 49.7
54.7 59.4
62.0 44.0
40.9 39.4
43.8 49.3
54.8 57.6
42.9 40.3
38.8 43.0
48.2 53.9
56.7 42.4
39.8 38.2
42.4 47.2
53.1 55.9
54.7 51.4
50.1 53.4
56.8 60.4
63.0 10.0
10.0 10.0
10.0 10.0
10.0 10.0
64.7 61.4
60.1 63.4
66.8 70.4
73.0 Day
7 8
9 10
11 12
13 14
15 16
17 63.3
63.0 60.9
61.5 60.4
59.4 63.6
60.0 61.4
60.1 61.7
68.7 69.7
66.3 69.8
68.0 66.8
73.4 66.8
71.4 65.7
69.6 55.0
54.4 52.5
53.0 52.1
51.2 51.8
51.9 51.9
51.7 53.0
68.3 69.4
66.0 69.3
67.6 66.4
72.8 66.4
70.9 65.4
69.2 68.0
69.1 65.8
68.7 67.0
66.0 72.3
65.7 70.1
65.0 68.7
67.2 67.9
65.0 66.7
65.2 63.9
70.5 64.1
67.3 63.9
66.7 66.6
67.0 64.4
65.1 64.0
62.7 69.6
63.4 65.0
63.3 65.2
64.8 64.2
62.5 62.2
61.3 60.5
62.9 61.2
61.3 61.5
62.4 62.5
61.7 59.8
59.7 58.9
58.0 58.8
58.8 59.0
59.3 60.2
57.1 56.3
54.3 54.9
54.1 53.3
53.9 53.8
54.1 53.6
55.3 56.2
55.3 53.4
54.0 53.2
52.3 52.8
52.7 53.1
52.7 54.1
55.2 54.6
52.6 53.2
52.3 51.4
52.0 52.1
52.1 51.8
53.2 63.3
63.0 60.9
61.5 60.4
59.4 63.6
60.0 61.4
60.1 61.7
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 63.3
63.0 60.9
61.5 60.4
59.4 63.6
60.0 61.4
60.1 61.7
Evening
18 19
20 21
61.8 61.9
61.2 59.6
67.2 69.8
68.2 67.7
53.9 53.5
53.1 50.6
66.9 69.3
67.9 67.4
66.6 68.6
67.4 66.8
65.6 66.6
65.8 64.9
65.0 65.3
64.8 63.4
63.1 62.8
62.2 60.6
60.9 60.4
59.6 57.5
56.2 55.5
55.2 52.7
55.3 54.6
54.2 51.5
54.1 53.7
53.4 50.8
61.8 61.9
61.2 59.6
0.0 5.0
5.0 5.0
61.8 66.9
66.2 64.6
Night
Timeframe
22 23
Hour
58.6 55.5
L eq
59.4 69.0
64.5 L,„„„
65.7 45.9
43.2 L min
51.2 68.4
64.0 LI%
67.4 63.4
L2%
64.8 61.6
L5%
63.4 60.3
L8%
58.6 56.3
L25%
54.8 51.9
L50%
48.1 45.4
L90%
47.1 44.3
L95%
46.1 58.6
43.4 55.5
L99%
Day
Min
Max
63.6 73.4
55.0 65.4
72.8 65.0
72.3 63.9
70.5 62.7
69.6 60.5
64.8 58.0
62.5 53.3
57.1 52.3
56.2 51.4
55.2 Energy Average
61.6 Average:
67.2 68.4
67.8 66.2
65.1 62.3
59.7 54.6
53.6 52.8
Evening
Min
Max
59.6 61.9
69.8 50.6
53.9 66.9
69.3 66.6
68.6 64.9
66.6 63.4
65.3 60.6
63.1 57.5
60.9 52.7
56.2 51.5
55.3 50.8
54.1 Energy Average
61.2 Average:
67.9 67.3
65.7 64.6
62.2 59.6
54.9 53.9
53.0 Night
Min
Max
50.1 63.0
59.7 69.0
38.1 55.7
59.3 68.4
58.5 67.8
56.3 66.9
54.9 66.2
50.7 64.3
46.1 62.0
39.4 57.6
38.8 56.7
Energy Average
57.8 Average:
63.9 63.2
61.5 60.4 56.8
53.1 47.0
46.1 38.2
55.9 10.0
10.0 68.6
65.5 Leq (dBA)
Daytime Evening Nighttime
(7am-7pm) (7pm-10pm) (10pm-lam)
61.2 61.6 57.8
24 -Hour
Z:\Shared\UciobsL16100-16500L16300\16391\04 Noise\Fieldwork\measurements\16391_L6 G DEN 2281 0 CROSSROADS
URBAN
u, R
APPENDIX 7.1:
CADNAA OPERATIONAL NOISE CALCULATIONS
16391-02 NA
2282
Howard World Wildlife Museum
UXR
This page intentionally left blank
16391-02 NA
2233
Howard World Wildlife Museum
16391- Howard World Wildlife Museum
CadnaA Noise Prediction Model: 16391-02 NA.cna
Date: 05.05.25
Analyst: B. Lawson
Calculation Configuration
Configuration
Parameter
Value
General
Max. Error (dB)
0.00 Max. Search Radius (ft)
10000.00
Min. Dist Src to Rcvr
0.00 Partition
Raster Factor
0.50 Max. Length of Section (ft)
3280.80
Min. Length of Section (ft)
3.30 Min. Length of Section (%)
0.00 Proj. Line Sources
On
Proj. Area Sources
On
Ref. Time
Daytime Penalty (dB)
0.00 Recr. Time Penalty (dB)
5.00 Night-time Penalty (dB)
10.00 DTM
Standard Height (m)
0.00 Model of Terrain
Triangulation
Reflection
max. Order of Reflection
1 Search Radius Src
328.08
Search Radius Rcvr
328.08
Max. Distance Source - Rcvr
3280.84 3280.84
Min. Distance Rvcr- Reflector
3.28 3.28
Min. Distance Source - Reflector
0.33 Industrial (ISO 9613 (1996))
Lateral Diffraction
some Obj
Obst. within Area Src do not shield
On
Screening
Incl. Ground Att. over Barrier
Dz with limit (20125)
Barrier Coefficients C1,2,3
3.0 20.0 0.0
Temperature (°F)
50 rel. Humidity (%)
70 Ground Absorption G
0.50 Wind Speed for Dir. (mph)
6.7 Roads (TNM)
Railways (FTA/FRA)
Aircraft (???)
Strictly acc. to AzB
Receiver Noise Levels
Name
M.
ID
Level Lr
Limit. Value.
Land Use
Height
Coordinates
Day
Eve
Night
CNEL
Day
Eve
Night
CNEL
Type
Auto
Noise Type
X
Y
Z
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(ft)
(ft)
(ft)
(ft)
RECEIVERS
R1
55.1 48.0
40.3 53.5
60.0 55.0
50.0 0.0
5.00 r 6502804.10
2222986.54
271.00
RECEIVERS
R2
46.9 48.5
14.0 47.2
60.0 55.0
50.0 0.0
5.00 r 6503057.48
2222171.49
270.82
RECEIVERS
R3
38.4 40.0
13.4 38.8
70.0 65.0
60.0 0.0
5.00 r 6503073.73
2221945.70
271.00
RECEIVERS
R4
34.1 34.5
30.9 38.5
55.0 50.0
45.0 0.0
5.00 r 6502254.18
2221700.19
307.28
Point Source(s)
Name
M.
ID
Result. PWL
Lw/Li
Operating Time
Height
Coordinates
Day
Evening
Night
Type
Value
norm.
Day
Special
Night
X
Y
Z
(dBA)
(dBA)
(dBA)
dB(A)
(min)
(min)
(min)
(ft)
(ft)
(ft)
(ft)
POINTSOURCE
TRASHO1
89.0 89.0
89.0 Lw
89 660.00
240.00
0.00 5.00
r 6502812.07
2222767.19
271.00
POINTSOURCE
TRASHO2
89.0 89.0
89.0 Lw
89 660.00
240.00
0.00 5.00
r 6502819.57
222276534
271.41
POINTSOURCE
TRASHO3
89.0 89.0
89.0 Lw
89 660.00
240.00
0.00 5.00
r 6502827.21
2222763.69
272.19
POINTSOURCE
AC01
88.9 88.9
88.9 Lw
88.9 429.00
156.00
252.00
5.00 g 6502819.79
2222545.07
296.00
POINTSOURCE
ACO2
88.9 88.9
88.9 Lw
88.9 429.00
156.00
252.00
5.00 g 6502770.54
2222520.89
296.00
POINTSOURCE
AC03
88.9 88.9
88.9 Lw
88.9 429.00
156.00
252.00
5.00 g 6502758.00
2222592.54
296.00
POINTSOURCE
AC04
88.9 88.9
88.9 Lw
88.9 429.00
156:00
252.00
5.00 g 6502779.49
2222663.29
296.00
POINTSOURCE
AC05
88.9 88.9
88.9 Lw
88.9 429.00
156.00
252.00
5.00 g 6502798.75
2222726.87
296.00
POINTSOURCE
AC06
88.9 88.9
88.9 Lw
88.9 429.00
156.00
252.00
5.00 g 6502846.21
2222739.86
296.00
POINTSOURCE
AC07
88.9 88.9
88.9 Lw
88.9 429.00
156.00
252.00
5.00 g 6502846.66
2222666.42
296.00
POINTSOURCE
ACO8
88.9 88.9
88.9 Lw
88.9 429.00
156.00
252.00
5.00 g 6502833.23
2222601.94
296.00
Area Source(s)
Urban Crossroads, Inc.
2234
Name
M.
ID
Result. PWL
Result. PWL"
Lw/Li
Operating Time
Height
Day
Evening
Night
Day
Evening
Night
Type
Value
norm.
Day
Special
Night
(ft)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
dB(A)
(min)
(min)
(min)
AREASOURCE
CAR01
81.1 81.1
81.1 62.0
62.0 62.0
Lw
81.1 660.00
240.00
0.00 5 r
AREASOURCE
CAR02
81.1 81.1
81.1 63.0
63.0 63.0
Lw
81.1 660.00
240.00
0.00 5
AREASOURCE
CAR03
81.1 81.1
81.1 63.1
63.1 63.1
Lw
81.1 660.00
240.00
0.00 5 r
AREASOURCE
CAR04
81.1 81.1
81.1 58.8
58.8 58.8
Lw
81.1 660.00
240.00
0.00 5 r
AREASOURCE
CAR05
81.1 81.1
81.1 54.3
54.3 54.3
Lw
81.1 660.00
240.00
0.00 5 r
AREASOURCE
CAR06
81.1 81.1
81.1 54.4
54.4 54.4
Lw
81.1 660.00
240.00
0.00 5 r
AREASOURCE
CAR07
81.1 81.1
81.1 57.6
57.6 57.6
Lw
81.1 660.00
240.00
0.00 5 r
AREASOURCE
CAROB
81.1 81.1
81.1 57.1
57.1 57.1
Lw
81.1 660.00
240.00
0.00 5
AREASOURCE
CAR09
81.1 81.1
81.1 64.6
64.6 64.6
Lw
81.1 660.00
240.00
0.00 5 r
AREASOURCE
CAR10
81.1 81.1
81.1 63.4
63.4 63.4
Lw
81.1 660.00
240.00
0.00 5 r
AREASOURCE
DOCK01
103.4
103.4
103.4
86.4 86.4
86.4 Lw
103.4
660.00
0.00 0.00
8 r
Name
ID
Height
Coordinates
Begin
End
x
y
z
Ground
(ft)
(ft)
(ft)
(ft)
(ft)
(ft)
AREASOURCE
CAR01
5.00 r
6502992.40
2222109.10
273.47
268.47
6503008.72
2222108.40
273.00
268.00
6503008.37
2222054.23
272.54
267.54
6502992.40
2222055.28
273.33
268.33
AREASOURCE
CAR02
5.00 r
6502940.32
2222109.10
274.91
269.91
6502959.41
2222108.75
274.35
269.35
6502960.11
2222072.64
274.45
269.45
6502941.01
2222072.98
275.06
270.06
AREASOURCE
CAR03
5.00 r
6502874.00
2222148.33
275.80
270.80
6502893.10
2222149.37
275.13
270.13
6502892.75
2222111.53
275.96
270.96
6502875.04
2222112.22
276.49
271.49
AREASOURCE
CAR04
5.00 r
6502990.66
2222163.61
273.46
268.46
6503028.86
2222163.96
271.61
266.61
6503030.60
2222116.73
271.41
266.41
6502990.66
2222117.08
273.51
268.51
AREASOURCE
CAR05
5.00 r
6502496.91
2222810.83
275.00
270.00
6502512.89
2222819.16
275.00
270.00
6502639.97
2222580.97
276.67
271.67
6502621.91
2222571.25
277.06
272.06
AREASOURCE
CAR06
5.00 r
6502552.82
2222838.61
274.31
269.31
6502672.61
2222607.01
275.52
270.52
6502655.94
2222598.68
275.86
270.86
6502534.07
2222830.97
275.00
270.00
AREASOURCE
CAR07
5.00 r
6502618.36
2222757.93
274.44
269.44
6502634.31
2222765.82
273.63
268.63
6502694.92
2222646.75
274.16
269.16
6502678.45
2222638.52
274.48
269.48
AREASOURCE
CAR08
5.00 r
6502656.16
2222776.63
272.70
267.70
6502691.45
2222794.07
271.61
266.61
6502717.66
2222742.61
271.67
266.67
6502699.23
2222734.77
271.99
266.99
6502711.78
2222710.46
272.41
267.41
6502695.90
2222702.03
272.66
267.66
AREASOURCE
CAR09
5.00 r
6502716.83
2222806.62
271.00
266.00
6502750.85
2222823.44
270.49
265.49
6502757.06
2222812.20
271.00
266.00
6502722.36
2222795.74
271.00
266.00
AREASOURCE
CAR10
5.00 r
6502793.53
2222844.54
271.00
266,00
6502808.81
2222813.77
271.00
266.00
6502793.13
2222806.32
271.00
266.00
6502775.69
2222835.72
270.52
265.52
AREASOURCE
DOCKO1
8.00 r
6502854.41
2222784.30
277.16
269.16
6502868.14
2222781.15
281.92
273.92
6502859.25
2222745.78
282.45
274.45
6502845.93
2222748.94
277.51
269.51
Building(s)
Name
Sel.
M.
ID
RB
Residents
Absorption
Height
Coordinates
Begin
x
y
z
Ground
(ft)
(ft)
(ft)
(ft)
(ft)
BUILDING
BUILDING00001
x
0 25.00
r 6502789.79
2222762.24
291.00
266.00
6502876.66
2222741.65
291.00
284.29
6502871.74
2222726.87
291.00
282.80
6502878.01
2222725.08
291.00
286.70
6502826.96
2222521.34
291.00
293.89
6502807.70
2222528.50
291.00
282.98
6502801.44
2222503.88
291.00
291.58
6502752.18
2222515.52
291.00
276.78
6502755.76
2222532.53
291.00
275.66
6502741.96
2222559.63
291.00
273.20
Urban Crossroads, Inc.
2235
Name
Sel.
M.
ID
RB
Residents
Absorption
Height
Coordinates
Begin
x
y
z
Ground
(ft)
(ft)
(ft)
(ft)
(ft)
6502737.86
2222574.30
291.00
272.28
6502735.61
2222604.63
291.00
270.60
6502739.23
2222620.03
291.00
269.87
6502753.52
2222648.15
291.00
268.85
6502763.82
2222660.15.
291.00
268.45
Urban Crossroads, Inc.
2286
UXR
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16391-02 NA
2267
Howard World Wildlife Museum
uXR
APPENDIX 8.1:
CONSTRUCTION NOISE CALCULATIONS
16391-02 NA
2268
Howard World Wildlife Museum
UXR
This page intentionally left blank
16391-02 NA
2239
Howard World Wildlife Museum
16391- Howard World Wildlife Museum
CadnaA Noise Prediction Model: 16391-02 NA_Construction.cna Date: 05.05.25
Analyst: B. Lawson
Calculation Configuration
Configuration
Parameter
Value
General
Max. Error (dB)
0.00 Max. Search Radius (ft)
10000.00
Min. Dist Src to Rcvr
0.00 Partition
Raster Factor
0.50 Max. Length of Section (ft)
3280.80
Min. Length of Section (ft)
3.30 Min. Length of Section (%)
0.00 Proj. Line Sources
On
Proj. Area Sources
On
Ref. Time
Daytime Penalty (dB)
0.00 Recr. Time Penalty (dB)
5.00 Night-time Penalty (dB)
10.00 DTM
Standard Height (m)
0.00 Model of Terrain
Triangulation
Reflection
max. Order of Reflection
1 Search Radius Src
328.08
Search Radius Rcvr
328.08
Max. Distance Source - Rcvr
3280.84 3280.84
Min. Distance Rvcr- Reflector
3.28 3.28
Min. Distance Source - Reflector
0.33 Industrial (ISO 9613 (1996))
Lateral Diffraction
some Obj
Obst. within Area Src do not shield
On
Screening
Incl. Ground Att. over Barrier
Dz with limit (20/25)
Barrier Coefficients C1,2,3
3.0 20.0 0.0
Temperature (°F)
50 rel. Humidity (%)
70 Ground Absorption G
0.50 Wind Speed for Dir. (mph)
6.7 Roads (TNM)
Railways (FTA/FRA)
Aircraft (???)
Strictly acc. to AzB
Receiver Noise Levels
Name
M.
ID
Level Lr
Limit. Value.
Land Use
Height
Coordinates
Day
Eve
Night
CNEL
Day
Eve
Night
CNEL
Type
Auto
Noise Type
X
Y
Z
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(ft)
(ft)
(ft)
(ft)
RECEIVERS
R1
64.4 64.4
64.4 71.0
60.0 55.0
50.0 0.0
5.00 r 6502804.10
2222986.54
271.00
RECEIVERS
R2
73.2 73.2
73.2 79.9
60.0 55.0
50.0 0.0
5.00 r 6503057.48
2222171.49
270.82
RECEIVERS
R3
69.2 69.2
69.2 75.9
70.0 65.0
60.0 0.0
5.00 r 6503073.73
2221945.70
271.00
RECEIVERS
R4
56.8 56.8
56.8 63.4
55.0 50.0
45.0 0.0
5.00 r 6502254.18
2221700.19
307.28
Point Source(s)
Name
M.
ID
Result. PWL
Lw / Li
Value
Operating Time
Height
Coordinates
Day
(dBA) (dBA) (dBA)
Evening
Night
Type
norm.
dB(A) (min) (min) (min) (ft)
Day
Special
Night
X
Y
Z
Area Source(s)
Name
M.
ID Result. PWL
Result. PWL"
Lw / Li
Operating Time
Height
Day
Evening
Night
Day
Evening
Night
Type
Value
norm.
Day
Special
Night
(ft)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
dB(A)
(min)
(min)
(min)
CONSTRUCTION
0 115.6
115.6
115.6
76.3 76.3
76.3 Lw
115.6
8 r
CONSTRUCTION
0 115.6
115.6
115.6
83.7 83.7
83.7 Lw
115.6
8 r
(ft)
(ft)
(ft)
Name
ID Height
Coordinates
Begin
End
x
y
z
Ground
(ft)
(ft)
(ft)
(ft)
(ft)
(ft)
CONSTRUCTION
0 8.00
r
6502582.68
2222861.47
276.00
268.00
6502632.37
2222768.19
276.66
268.66
6502801.96
2222849.40
274.00
266.00
6502816.54
2222822.32
274.00
266.00
Urban Crossroads, Inc.
2240
Name
ID Height
Coordinates
Begin
End
x
y
z
Ground
(ft)
(ft)
(ft)
(ft)
(ft)
(ft)
6502879.04
2222820.93
275.21
267.21
6502860.29
2222745.58
283.03
275.03
6502875.57
2222741.76
291.75
283.75
6502872.09
2222727.87
290.93
282.93
6502878.34
2222725.79
294.85
286.85
6502826.61
2222521.97
301.48
293.48
6502806.82
2222527.18
291.03
283.03
6502801.61
2222502.87
299.93
291.93
6502753.00
2222514.33
284.91
276.91
6502747.97
2222491.81
286.03
278.03
6502739.46
2222478.92
285.96
277.96
6502743.75
2222471.99
287.79
279.79
6502744.05
2222463.85
289.25
281.25
6502735.94
2222453.30
285.94
277.94
6502722.92
2222452.74
285.46
277.46
6502715.20
2222459.60
285.12
277.12
6502713.07
2222467.11
285.00
277.00
6502685.85
2222473.74
283.82
275.82
6502662.15
2222488.62
282.93
274.93
6502659.24
2222495.60
282.73
274.73
6502660.85
2222513.18
282.42
274.42
6502668.62
2222532.04
281.99
273.99
6502653.69
2222536.55
281.64
273.64
6502630.08
2222523.36
282.00
274.00
6502614.80
2222554.96
281.48
273.48
6502621.17
2222561.73
280.69
272.69
6502622.44
2222570.93
280.08
272.08
6502493.62
2222816.76
278.00
270.00
CONSTRUCTION
0 8.00
r
6502933.11
2222164.22
278.00
270.00
6503030.41
2222164.22
274.52
266.52
6503030.41
2222115.68
274.46
266.46
6502992.08
2222115.26
276.49
268.49
6502990.48
2222112.83
276.53
268.53
6502992.08
2222109.22
276:48
268.48
6503008.74
2222109.22
276.00
268.00
6503008.54
2222055.05
275.55
267.55
6502991.63
2222053.19
276.33
268.33
6502992.65
2222035.73
276.23
268.23
6503002.39
2222022.02
276.00
268.00
6503007.70
2222019.84
276.00
268.00
6503017.38
2222021.62
275.67
267.67
6502957.28
2221992.33
277.48
269.48
6502965.30
2222003.46
277.29
269.29
6502962.46
2222016.88
277.45
269.45
6502953.38
2222023.25
277.85
269.85
6502934.99
2222024.84
278.53
270.53
6502928.65
2222029.02
278.78
270.78
6502894.15
2222095.88
279.24
271.24
6502893.11
2222108.59
279.03
271.03
6502890.82
2222111.51
279.01
271.01
6502874.57
2222112.14
279.50
271.50
6502874.98
2222148.81
278.75
270.75
6502891.40
2222148.73
278.20
270.20
6502899.57
2222160.77
278.00
270.00
6502910.19
2222164.01
278.00
270.00
Barrier(s)
Name
Sel.
M.
ID Absorption
Z-Ext.
Cantilever
Height
Coordinates
left
right
horz.
vert.
Begin
End
x
y
z
Ground
(ft)
(ft)
(ft)
(ft)
(ft)
(ft)
(ft)
(ft)
(ft)
6.00 r
6503034.82
2222157.78
272.17
266.17
6503034.82
2222259.18
273.68
267.68
Building(s)
Name Sel. M.
ID RB Residents Absorption
Height
Begin
Coordinates
y
(ft)
Ground
(ft)
(ft)
(ft)
(ft)
Urban Crossroads, Inc.
2241
GLOBAL WILDLIFE DISCOVERY MUSEUM
Initial Study/Mitigated Negative Declaration
August 2025
Appendix I
Technical Memorandum
Focused Construction Noise Assessment
City of Rancho Mirage I
2242
TECHNICAL MEMORANDUM 141%Ltj
DATE: May 27, 2025
TO: John Criste, Terra Nova Planning & Research, Inc.
FROM: Bill Lawson, Urban Crossroads, Inc.
JOB NO: 16391-03 Noise Assessment.docx
SUBJECT: HOWARD WORLD WILDLIFE MUSEUM FOCUSED
CONSTRUCTION NOISE ASSESSMENT
Urban Crossroads, Inc. has completed the following Noise Assessmentforthe Howard World Wildlife Museum (Project), which is located at the northeast corner of Highway 111 and Mirage Cove Drive in the City of Rancho Mirage.
PROJECT OVERVIEW
On May 5, 2025, Urban Crossroads, Inc. prepared a Noise and Vibration Analysis (2025 Noise Study) report for the Howard World Wildlife Museum Project. The 2025 Noise Study included a detailed evaluation of the proposed construction activities by stage for the overall Project development.
However, the 2025 Noise Study did not fully assess the potential construction noise level impacts associated with the planned excavation of approximately 1,035 cubic yards including approximately 350 cubic yards of rock material. Exhibit 1 presents the limits of the planned hillside excavation.
NOISE PREDICTION MODEL
To fully describe the planned excavation construction noise levels from the Project, Urban Crossroads, Inc. developed a noise prediction model using the CadnaA (Computer Aided Noise Abatement) computer program. CadnaA can analyze multiple types of noise sources using the spatially accurate Project site plan, georeferenced aerial imagery, topography, buildings, and barriers in its calculations to predict outdoor noise levels. Using the ISO 9613-2 protocol, CadnaA calculates the noise levels at each receiver based on the distance from each noise source to the noise receiver locations, the ground absorption, distance, and the effects of barrier/building attenuation and provides a summary of noise level at each receiver. A default ground attenuation factor of 0.5 was used in the CadnaA noise analysis to account for mixed ground representing a combination of hard and soft surfaces.
20341 SW Birch Street I Suite 230 I Newport Aga i, CQ 9 660 I (949) 660-1994 I urbanxroads.com
u, R
EXHIBIT 1: HILLSIDE EXCAVATION LIMITS OF CONSTRUCTION
LEGEND:
riSite Boundary
—• Distance from receptor to Project site boundary (in feet) * Peak Hour Hillside Excavation Construction Activity Typical Hillside Excavation Construction Activity
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RECEIVER LOCATIONS
To assess the potential for noise impacts, four receiver locations, as shown on Exhibit 1, were identified as representative locations for analysis. These are the same receiver locations presented in the 2025 Noise Study. Sensitive uses or receivers are generally defined as locations where people reside or where the presence of unwanted sound could otherwise adversely affect the use of the land.
CONSTRUCTION NOISE
To prevent high levels of construction noise from impacting noise -sensitive land uses, City of Rancho Mirage Municipal Code 15.04.030[A][11] indicates that construction, shall be limited to the hours of 7:00 a.m. and 7:00 p.m. with no activity on Sundays and holidays (1). The city recognizes that construction noise is difficult to control and restricts allowable hours for this intrusion. Still, construction, even when restricted within these hours, presents a nuisance when conducted in proximity to sensitive receptors. (2)
CONSTRUCTION NOISE CRITERIA
Neither the City of Rancho Mirage General Plan nor Municipal Code establish numeric maximum acceptable construction source noise levels at potentially affected receivers. According to the FTA Transit Noise and Vibration Impact Assessment Manual, local noise ordinances are typically not very useful in evaluating construction noise impacts. They usually relate to nuisance and hours of allowed activity, and sometimes specify limits in terms of maximum levels, but are generally not practical for assessing the impact of a construction project. Project construction noise criteria should account for the existing noise environment, the absolute noise levels during construction activities, the duration of the construction, and the adjacent land use. (3 p.172) Due to the lack of standardized construction noise thresholds, the FTA provides guidelines that "can be considered reasonable criteria for (construction noise) assessment". (3 p. 179) The FTA identifies two types of construction noise assessment criteria, general and detailed. For general construction noise assessments, the analysis is limited to the Lmax of the two noisiest pieces of equipment with an hourly daytime exterior noise level threshold for residential land use of 90 dBA Leq(lhr). (3 p. 179) For more detailed construction noise assessments, the analysis should include all anticipated equipment along with the typical usage factor for each piece of equipment. Detailed construction noise assessments should use an 8 -hour daytime exterior noise level threshold for residential land uses of 80 dBA Leq(shr). Based on the FTA guidance, an absolute daytime exterior construction noise level of 80 dBA Leg is used as a reasonable threshold to assess construction noise impacts while using the FTA detailed analysis construction noise methodology. (3 p. 179) 16391-03 Noise Assessment. docx
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Howard World Wildlife Museum
PAMIR
CONSTRUCTION REFERENCE NOISE LEVELS
To describe construction noise activities, this construction noise analysis was prepared using reference construction equipment noise levels from the Federal Highway Administration (FHWA) published in the Roadway Construction Noise Model (RCNM). The RCNM includes a national database of construction equipment reference noise emission levels, including a comprehensive list of the noise -generating characteristics of specific types of construction equipment. (4 p. 3) In addition, the database provides a usage factor to estimate the fraction of time each piece of construction equipment is operating at full power (i.e., its loudest condition) during a construction operation.
According to the EPA, FTA, and FHWA, the overall construction noise level is governed primarily by the noisiest pieces of equipment. The quieter pieces do not affect the overall level, but they do reduce the magnitude of the fluctuations in the noise level. Therefore, a rough estimate of the noise level needs only to include the noisiest pieces of equipment expected at the site. (5) Consistent with FHWA and FTA guidance for detailed construction noise assessment, Table 1 presents the combined noise levels for the loudest construction activities expected from the hillside excavation activities, assuming all equipment operates simultaneously.
TABLE 1: CONSTRUCTION REFERENCE NOISE LEVELS
Construction
Stage
Reference
Construction
Equipmnet'
Reference Noise
Level @ 50 Feet
(dBA Leq)
Composite
Reference Noise
Level
(dBA Leq)2
Reference
Power Level
(dBA LW)3
Excavation
Backhoe
Backhoe
Dump Truck
Front End Loader
Compressor (air)
Compressor (air)
Jack Hammer
Jack Hammer
Jack Hammer
74 74
72 75
74 74
82 82
82 87.9
119.6
FHWA Road Construction Noise Model.
2 Represents the comb'ned noise level for all equipment assuming they operate at the same time. 3 The total amount of acoustical energy produced by a sound source independent of distance or surroundings.
CONSTRUCTION NOISE ANALYSIS
Construction projects involve various stages, and activities that frequently shift from one location to another. Typical construction activities are best evaluated as multiple moving point sources within the limits of construction (project site boundary) since the speed and power of the equipment vary, and the equipment constantly changes position in terms of its distance and direction relative to the receivers. (3) However, to present a conservative analysis of the construction noise levels when equipment is operating near the limits of construction, this analysis also describes the peak hour Leq(lhr) Project construction equipment noise levels. Using the reference noise levels of construction equipment in Table 1, the construction noise source activities shown in Exhibit 1, the CadnaA noise 16391-03 Noise Assessment. docx
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Howard World Wildlife Museum
prediction model, the typical Leg(Bhr) and the peak hour equipment Leg(lhr)construction noise levels at nearby receiver locations were calculated. Table 2 shows that the typical and peak hour construction noise levels at the nearest noise sensitive receiver locations will not exceed the 80 dBA Leg construction noise threshold. Therefore, construction noise impacts are considered less than significant at the nearby noise -sensitive receiver locations. Appendix 1 includes the typical construction equipment noise calculations and Appendix 2 includes the peak hour construction equipment noise calculations.
TABLE 2: HILLSIDE EXCAVATION CONSTRUCTION NOISE COMPLIANCE Receiver
Location'
Receiver
Distance
(Feet)
Unmitigated Construction Noise Levels (dBA Leg)
Typical Construction
Noise Levels
(8-Hour)2
Peak Construction
Noise Levels
(1-Hour)3
Threshold4
Threshold
Exceededj5
R1
R2
R3
R4
244'
413'
614'
948'
66.0 72.5
80 No
39.0 45.4
80 No
37.2 44.5
80 No
55.4 61.8
80 No
' Construction equipment noise source and receiver locations are shown on Exhibit 1. 'Typical construction equipment noise level calculations are included in Appendix 1.
Peak Hour construction equipment noise level calculations are included in Appendix 2. 4 Federal Transit Administration, Transit Noise and Vibration Impact Assessment Manual. 5 Do the estimated Project construction noise levels exceed the construction noise level threshold?
REFERENCES
1. City of Rancho Mirage. Municipal Code, Sections 15.04.030.
2. —. General Plan Update Draft Environmental Impact Report. 2005.
3. U.S. Department of Transportation, Federal Transit Administration. Transit Noise and Vibration Impact Assessment Manual, FTA Report No. 0123. September 2018.
4. U.S. Department of Transportation, Federal Highway Administration, Office of Environment and Planning. FHWA Roadway Construction Noise Model. January, 2006.
5. U.S. Department of Transportation, Federal Highway Administration. Special Report - Measurement, Prediction, and Mitigation. Office of Planning, Environment, and Realty - Environment - Noise. [Online] 2017.
https://www.fhwa.dot.gov/environment/noise/construction_noise/special_report/hcn00.c fm.
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u„R
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U14,R
APPENDIX 1:
TYPICAL CONSTRUCTION EQUIPMENT NOISE CALCULATIONS
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16391- Howard World Wildlife Museum
CadnaA Noise Prediction Model: 16391-03 NA_HillsideTypical.cna Date: 27.05.25
Analyst: B. Lawson
Calculation Configuration
Configuration
Parameter
Value
General
Max. Error (dB)
0.00 Max. Search Radius (ft)
10000.00
Min. Dist Src to Rcvr
0.00 Partition
Raster Factor
0.50 Max. Length of Section (ft)
3280.80
Min. Length of Section (ft)
3.30 Min. Length of Section (%)
0.00 Proj. Line Sources
On
Proj. Area Sources
On
Ref. Time
Daytime Penalty (dB)
0.00 Recr. Time Penalty (dB)
5.00 Night-time Penalty (dB)
10.00 DTM
Standard Height (m)
0.00 Model of Terrain
Triangulation
Reflection
max. Order of Reflection
1 Search Radius Src
328.08
Search Radius Rcvr
328.08
Max. Distance Source - Rcvr
3280.84 3280.84
Min. Distance Rvcr- Reflector
3.28 3.28
Min. Distance Source - Reflector
0.33 Industrial (ISO 9613 (1996))
Lateral Diffraction
some Obj
Obst. within Area Src do not shield
On
Screening
Incl. Ground Att. over Barrier
Dz with limit (20/25)
Barrier Coefficients C1,2,3
3.0 20.0 0.0
Temperature (°F)
50 rel. Humidity (%)
70 Ground Absorption G
0.50 Wind Speed for Dir. (mph)
6.7 Roads (TNM)
Railways (FTA/FRA)
Aircraft (???)
Strictly acc. to AzB
Receiver Noise Levels
Name
M.
ID
Level Lr
Limit. Value.
Land Use
Height
Coordinates
Day
Eve
Night
CNEL
Day
Eve
Night
CNEL
Type
Auto
Noise Type
X
Y
Z
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(ft)
(ft)
(ft)
(ft)
RECEIVERS
R1
66.0 66.0
66.0 72.6
60.0 55.0
50.0 0.0
5.00 r 6502804.10
2222986.54
271.00
RECEIVERS
R2
39.0 39.0
39.0 45.6
60.0 55.0
50.0 0.0
5.00 r 6503057.48
2222171.49
270.82
RECEIVERS
R3
37.2 37.2
37.2 43.8
70.0 65.0
60.0 0.0
5.00 r 6503073.73
2221945.70
271.00
RECEIVERS
R4
55.4 55.4
55.4 62.0
55.0 50.0
45.0 0.0
5.00 r 6502254.18
2221700.19
307.28
Area Source(s)
Name
M.
ID Result. PWL
Result. PWL"
Lw / Li
Operating Time
Height
Day
Evening
Night
Day
Evening
Night
Type
Value
norm.
Day
Special
Night
(ft)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
dB(A)
(min)
(min)
(min)
HILLSIDE
0 119.6
119.6
119.6
88.1 88.1
88.1 Lw
119.6
8 r
Name
ID Height
Coordinates
Begin
End
x
y
z
Ground
(ft)
(ft)
(ft)
(ft)
(ft)
(ft)
HILLSIDE
0 8.00
r
6502864.35
2222749.92
284.68
276.68
6502881.91
2222745.73
294.34
286.33
6502878.77
2222731.19
294.73
286.73
6502883.84
2222730.02
297.69
289.69
6502868.48
2222669.21
293.04
285.04
6502864.18
2222652.15
292.00
284.00
6502859.10
2222631.32
290.97
282.97
6502855.72
2222618.43
289.32
281.32
6502854.94
2222614.39
290.60
282.60
6502851.81
2222603.85
290.90
282.90
6502830.59
2222516.82
305.48
297.48
Urban Crossroads, Inc.
2251
Name
ID Height
Coordinates
Begin
End
x
y
z
Ground
(ft)
(ft)
(ft)
(ft)
(ft)
(ft)
6502810.80
2222521.34
295.01
287.01
6502804.98
2222497.47
303.84
295.84
6502744.74
2222511.44
284.68
276.68
6502749.17
2222527.76
283.87
275.87
6502741.14
2222541.09
282.48
274.48
6502735.12
2222555.44
281.36
273.36.
6502731.22
2222570.50
280.42
272.42
6502729.52
2222585.96
279.59
271.59
6502730.07
2222601.51
278.77
270.77
6502732.85
2222616.82
277.98
269.98
6502735.32
2222616.32
277.99
269.99
6502737.84
2222616.15
278.00
270.00
6502740.36
2222616.32
277.99
269.99
6502742.83
2222616.82
277.98
269.98
6502747.52
2222617.26
277.96
269.96
6502759.67
2222615.69
278.07
270.07
6502766.44
2222617.34
278.01
270.01
6502771.47
2222617.26
278.05
270.05
6502775.47
2222618.21
278.02
270.02
6502783.45
2222617.52
278.11
270.11
6502787.36
2222618.91
278.05
270.05
6502788.75
2222617.60
278.14
270.14
6502801.16
2222619.60
278.15
270.15
6502810.97
2222620.03
278.33
270.33
6502826.51
2222619.95
279.27
271.27
6502832.50
2222619.77
279.61
271.61
6502835.88
2222624.90
280.55
272.55
6502837.01
2222627.33
280.86
272.86
6502841.70
2222629.41
282.57
274.57
6502841.27
2222631.58
282.29
274.29
6502844.39
2222633.75
283.35
275.35
6502847.52
2222650.16
283.65
275.65
6502848.73
2222652.41
283.94
275.94
6502849.34
2222658.14
283.87
275.87
6502852.81
2222682.80
283.82
275.82
6502853.42
2222694.34
283.46
275.46
6502856.89
2222715.87
283.57
275.57
6502857.41
2222722.12
283.44
275.44
6502858.37
2222723.85
283.67
275.67
6502862.62
2222738.61
284.76
276.76
Urban Crossroads, Inc.
2252
uAN,R
APPENDIX 2:
PEAK HOUR CONSTRUCTION EQUIPMENT NOISE CALCULATIONS
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16391- Howard World Wildlife Museum
CadnaA Noise Prediction Model: 16391-03 NA_HillsidePeak.cna Date: 27.05.25
Analyst: B. Lawson
Calculation Configuration
Configuration
Parameter
Value
General
Max. Error (dB)
0.00 Max. Search Radius (ft)
10000.00
Min. Dist Src to Rcvr
0.00 Partition
Raster Factor
0.50 Max. Length of Section (ft)
3280.80
Min. Length of Section (ft)
3.30 Min. Length of Section (%)
0.00 Proj. Line Sources
On
Proj. Area Sources
On
Ref. Time
Daytime Penalty (dB)
0.00 Recr. Time Penalty (dB)
5.00 Night-time Penalty (dB)
10.00 DTM
Standard Height (m)
0.00 Model of Terrain
Triangulation
Reflection
max. Order of Reflection
1 Search Radius Src
328.08
Search Radius Rcvr
328.08
Max. Distance Source - Rcvr
3280.84 3280.84
Min. Distance Rvcr- Reflector
3.28 3.28
Min. Distance Source - Reflector
0.33 Industrial (ISO 9613 (1996))
Lateral Diffraction
some Obj
Obst. within Area Src do not shield
On
Screening
Incl. Ground Att. over Barrier
Dz with limit (20/25)
Barrier Coefficients C1,2,3
3.0 20.0 0.0
Temperature (°F)
50 rel. Humidity (%)
70 Ground Absorption G
0.50 Wind Speed for Dir. (mph)
6.7 Roads (TNM)
Railways (FTA/FRA)
Aircraft (???)
Strictly acc. to AzB
Receiver Noise Levels
Name
M.
ID
Level Lr
Limit. Value.
Land Use
Height
Coordinates
Day
Eve
Night
CNEL
Day
Eve
Night
CNEL
Type
Auto
Noise Type
X
Y
Z
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(dBA)
(ft)
(ft)
(ft)
(ft)
RECEIVERS
R1
72.5 72.5
72.5 79.2
60.0 55.0
50.0 0.0
5.00 r 6502804.10
2222986.54
271.00
RECEIVERS
R2
45.4 45.4
45.4 52.1
60.0 55.0
50.0 0.0
5.00 r 6503057.48
2222171.49
270.82
RECEIVERS
R3
44.5 44.5
44.5 51.2
70.0 65.0
60.0 0.0
5.00 r 6503073.73
2221945.70
271.00
RECEIVERS
R4
61.8 61.8
61.8 68.4
55.0 50.0
45.0 0.0
5.00 r 6502254.18
2221700.19
307.28
Point Source(s)
Name
M.
ID
Result. PWL
Lw/Li
Operating Time
Height
Coordinates
Day
Evening
Night
Type
Value
norm.
Day
Special
Night
X
Y
Z
(dBA)
(dBA)
(dBA)
dB(A)
(min)
(min)
(min)
(ft)
(ft)
(ft)
(ft)
HILLSIDEPEAK
PEAK01
119.6
119.6
119.6
Lw
119.6
8.00 r 6502869.38
2222742.63
288.05
HILLSIDEPEAK
PEAK02
119.6
119.6
119.6
Lw
119.6
8.00 r 6502825.74
2222524.42
300.24
HILLSIDEPEAK
PEAK03
119.6
119.6
119.6
Lw
119.6
8.00 r 6502800.52
2222506.00
298.71
HILLSIDEPEAK
PEAK04
119.6
119.6
119.6
Lw
119.6
8.00 r 6502752.52
2222516.67
284.72
Urban Crossroads, Inc.
2255
Global Wildlife Discovery Museum
Response to Comments