20211123_ESC_Calculations

r
Quarry Phone Numbers:
[phone] - Knightdale
[phone] - Triangle
[phone] - Moncure
[phone] - Nash County
[phone] - N. Myrtle Beach
WAIF STONE
CORPORATION
www.wakestonecorp.com
Locations:
6811 Knightdale Blvd., Knightdale, N.C.
222 Star Lane, Cary, N.C.
9725 Stone Quarry Rd., Moncure, N.C.
7379 North Halifax Rd., Battleboro, N.C.
3990 Hwy 9 Business East, Loris, S.C.
Business Office Address:
P.O. Box 190
6821 Knightdale Blvd.
Knightdale, N.C. 27545
[phone]
Fax: [phone]
Erosion Control Calculations
For
Wake Stone Corporation
Knightdale Quarry
Mining Permit No. 92-06
Wake County, North Carolina
2021 Mining Permit Modification
Dated: November 19, 2021
Prepared by:
L. Cole Atkins
Geologist/ Environmental Specialist
Wake Stone Corporation RECEIVED
PO Box 190
Knightdale, NC 27545 MV 2 3 2021
LARD QUALITY
[AIN!NG PROGRAM

DrainageArea Map for Erosion&Sediment Control Measures
Area B
WM
2021-1 Wet Pond
Drainage area Ieta
� 12.6 Acres � •� � -�
Mr
C
,r
2021-2 Skimmer Basi
rainage Area
1.5 Acreselm
Ik
or
2021-3 Skimmer B
-4k,ainage Area -
n [J I_ 7 Acreswell
y —�
Fred Smith Cam{, a y
c
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0 1200
600
Feet

Wet Detention Pond 2021-1 Size Calculations.xlsx
Total Acres:
Total Imp Ac:
12.6
12'
95.24
Percent Impervious:
Weighted CN:
93
SCS Method for first flush
P_(Precipitation depth) =
1.5
in
S (Ultimate soil storage) =
0.752688172
in
Q` (Runoff depth) _ _
0.86627891
in
V =
39621.86478
ft3
Design Criteria
Table
Weighted impervious, Piedmont
SA, ft2
18700.308
14921.0424
13282.3152
required min depth, ft
SA/DA
SA, ac
0.4293
0.34254
0.304921
3
3.407142857
4
2.718571429
5
2.42
6
7
8
2.1971428S7
0.276841
12059.1504
1.944761905
0.24504
10673.9424
1.673809524
0.2109
9186.804
Contour
275
276
_ 277
278
279
280
2811
_ 282
4 283
SA, ft2
Incr. Vol. ft
Cum. Vol. ft3
14458
15898
15178
15178
31824
49993.5
70319.5
93471.5
118942
17394
18945
21707
24597
26344
16646
18169.5�
20326
231521
25470.5`
28125
27234.51
146176.5
175209
29940
29032.51
284
31790
30865
206074
Permanent pool volume: 1
70319.5
cu.ft.
Perm pool + first flush:
109941.3648
cu.ft.
This happens between elev 280 and 281
Top of Riser to be set at 283
Forebay Volume shall be between 15% and 20% of main pool
15%
20%
10547.925
14063.9
Pond Design (from attached schematics and "Pond Design final' spreadsheet_
Permanent Pool Surface Area (not including forebays) =
Permanent Pool Depth (excluding 6" sediment storage) =
Permanent Pool Volume (excluding 6" sediment storage) =
Permanent Pool Elevation =
21707
ft2
'meets min. required per SA/DA chart above
4
ft
70319.5
ft3
279
ft above msl
Emergency Spillway Elevation = _
Crest of Darn Elevation
Barrel and Riser set at Elevation:
284
ft above msl
285
ft above msl
275
ft above msl
Barrel Diameter and Material 20" Corrugated Metal Pipe
Riser Diameter and Material 48" Corrugated Metal Pipe
Riser Height 7.1 ft
Crest of Riser Elevation = 282.1 ft above msl

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Watershed & Pond Innuts
A =
12.6 ac
C (rational C) =
0.86
CN (curve number) =
93
H =
32 ft
L =
2830 ft
Tc (Kirpich) =
20.0 min
Stage Storage:
Ks =
22845
b =
1.1051
Zo (Z inv) =
275.0 ft
Intial depth, perm pool, Zi =
279.0 ft
Riser and Barrel:
Dr (riser diameter) =
48 in
Cw (weir coefficient) =
3.33
Zcr (riser crest elev.) =
282.1 ft
Db (barrel diameter) =
20 in
Cd (discharge coeff) =
0.51
Zinv (barrel inv. elev.) =
275.0 ft
Drawdown, Perforated Riser:
rows =
1
holes/row =
6
N, holes =
6
D hole =
4 in
A orifice =
75 sq in
Deff =
9.80 in
Cd =
0.51
Inv =
279.0 ft
Emergency Spillway
L =
20.0 ft
Zcr =
284.00 ft
Cw =
3.0
Storm Data for 2 Year Storm:
g =
112.065
h =
18.0113
P =
2.89 in
S =
0.75 in
Q. =
2.15 in
I =
3.0 in/hr
Qp =
31.98 cfs
Tp =
36.83 min
dT =
4 min
nin]
[cfs]
[ft]
ft msl
[cu ft]
[cfs]
[cfs]
[cfs]
[cfs]
[cts]
0
0.000
0.00
279.00
0.87
0.000
0.000
0.000
15.864
0.000
4
0.922
0.02
279.02
222.11
0.000
0.003
0.003
15.902
0.003
8
3.581
0.03
279.03
442.53
0.000
0.009
0.009
15.934
0.009
12
7.671
0.07
279.07
1299.89
0.000
0.038
0.038
16.050
0.038
16
12.721
0.17
279.17
3131.87
0.000
0.125
0.125
16.274
0.125
20
18.147
0.31
279.31
6154.74
0.000
0.313
0.313
16.611
0.313
24
23.325
0.49
279.49
10434.79
0.000
0.642
0.642
17.052
0.642
28
27.657
0.72
279.72
15878.72
0.000
1.135
1.135
17.574
1.135
32
30.644
0.98
279.98
22244.12
0.000
1.612
1.612
18.145
1.612
36
31.942
1.25
280.25
29211.77
0.000
1.962
1.962
18.733
1.962
40
31.401
1.52
280.52
36406.97
0.000
2.261
2.261
19.309
2.261
44
29.083
1.79
280.79
43400.58
0.000
2.513
2.513
19.842'
2.513
48
25.502
2.02
281.02
49777.38
0.000
2.719
2.719
20.309 1
2.719
52
22.144
2.22
281.22
55245.17
0.000
2.883
2.883
20.697,
2.883
56
19.228
2.39
281.39
59867.81
0.000
3.013
3.013
21.017
3.013
60
16.696
2.53
281.53
63759.39
0.000
3.118
3.118
21.280
3.118
64
14.497
2.65
281.65
67018.20
0.000
3.202
3.202
21.497
3.202
68
12.588
2.74
281.74
69729.07
0.000
3.271
3.271
21.675
3.271
72
10.931
2.82
281.82
71965.36
0.000
3.326
3.326
21.820
3.326
76
9.491
2.89
281.89
73790.58
0.000
3.370
3.370
21.938
3.370
80
8.242
2.94
281.94
75259.73
0.000
3.405
3.405
22.032
3.405
84
7.156
2.98
281.98
76420.50
0.000
3.433
3.433
22.106
3.433
88
6.214
3.01
282.01
77314.22
0.000
3.454
3.454
22.163
3.454
92
5.396
3.04
282.04
77976.74
0.000
3.469
3.469
22.204
3.469
96
4.685
3.05
282.05
78439.18
0.000
3.480
3.480
22.234
3.480
100
4.068
3.06
282.06
78728.51
0.000
3.486
3.486
22.252
3.486
104
3.533
3.07
282.07
78868.18
0.000
3.490
3.490
22.260
3.490
108
3.067
3.07
282.07
78878.49
0.000
3.490
3.490
22.261
3.490
112
2.664
3.07
282.07
78777.11
0.000
3.488
3.488
22.255
3.488
116
2.313
3.06
282.06
78579.36
0.000
3.483
3.483
22.242
3.483
120
2.008
3.05
282.05
78298.52
0.000
3.476
3.476
22.225
3.476
124
1.744
3.04
282.04
77946.15
0.000
3.468
3.468
22.202
3.468
128
1.514
3.02
282.02
77532.28
0.000
3.459
3.459
22.176
3.459
132
1.315
3.00
282.00
77065.62
0.000
3.448
3.448
22.147
3.448
136
1.142
2.99
281.99
76553.72
0.000
3.436
3.436
22.114
3.436
140
0.991
2.97
281.97
76003.15
0.000
3.423
3.423
22.079
3.423
144
0.861
2.95
281.95
75419.62
0.000
3.409
3.409
22.042
3.409
148
0.747
2.93
281.93
74808.07
0.000
3.394
3.394
22.003
3.394
152
0.649
2.90
281.90
74172.82
0.000
3.379
3.379
21.963
3.379
156
0.564
2.88
281.88
73517.58
0.000
3.363
3.363
21.921
3.363
160
0.489
2.86
281.86
72845.62
0.000
3.347
3.347
21.877
3.347
164
0.425
2.83
281.83
72159.75
0.000
3.330
3.330
21.833
3.330
168
0.369
2.81
281.81
71462.42
0.000
3.313
3.313
21.788
3.313
172
0.320
2.78
281.78
70755.76
0.000
3.296
3.296
21.742
3.296
176
0.278
2.76
281.76
70041.61
0.000
3.278
3.278
21.696
3.278
180
0.242
2.73
281.73
69321.58
0.000
3.260
3.260
21.649
3.260
184
0.210
2.70
281.70
68597.07
0.000
3.242
3.242
21.601
3242
188
0.182
2.68
281.68
67869.30
0.000
3.224
3.224
21.553
3.224
192
0.158
2.65
281.65
67139.30
0.000
3.205
3.205
21.505
3.205
196
0.137
2.63
281.63
66408.01
0.000
3.186
3.186
21.457
3.186
200
0.119
2.60
281.60
65676.22
0.000
3.168
3.168
21.408
3.168
204
0.104
2.57
281.57
64944.61
0.000
3.149
3.149
21.359
3.149
208
0.090
2.55
281.55
64213.80
0.000
3.129
3.129
21.311
3.129
212
0.078
2.52
281.52
63484.31
0.000
3.110
3.110
21.262
3.110
216
0.068
2.50
281.50
62756.59
0.000
3.091
3.091
21.213
3.091
220
0.059
2.47
281.47
62031.03
0.000
3.072
3.072
21.164
3.072
224
0.051
2.44
281.44
61307.99
0.000
3.052
3.052
21.115
3.052
228
0.044
2.42
281.42
60587.77
0.000
3.032
3.032
21.066
3.032
232
0.039
2.39
281.39
59870.62
0.000
3.013
3.013
21.017
3.013
236
0.033
2.37
281.37
59156.78
0.000
2.993
2.993
20.968
2.993
240
0.029
2.34
281.34
58446.44
0.000
2.973
2.973
20.919
2.973
244
0.025
2.31
281.31
57739.78
0.000
2.954
2.954
20.870
2.954
248
0.022
2.29
281.29
57036.95
0.000
2.934
2.934
20.822
2.934
252
0.019
2.26
281.26
56338.07
0.000
2.914
2.914
20.773
2.914
256
0.017
2.24
281.24
55643.28
0.000
2.894
2.894
20.725
2.894
260
0.014
2.21
281.21
54952.67
0.000
2.874
2.874
20.677
2.874
264
0.012
2.19
281.19
54266.32
0.000
2.854
2.854
20.629
2.854
0.
0.
0.
0.
0.
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0
0
0
0
0
0
0
0
0
0
0
0
0
0.003 3s
0.009 30
0.038 zs
0.125 zo
0.313 3 is
0.642 2
1.135 LL 10
1.612 s
1.982 0
2.261
2.513
2.719
Qin vs Qout
0 200 400 600 800 1000 1200
Time (minutes)
[.00s
-Qin
-gout
3.013
3.118
3.202
Max Stage Elev,
282.0688
3.271
Stage at 24hr (1440 min)
0.08
3.326
Stage at 2 days (2880 min)
0.02
3.370
Stage at 3 days (4320 min)
0.01
3.405
Stage at 4 days (5760 min)
0.00
3.433
Stage at 5 days (7200 min)
0.00
3.454
Peak Discharge
3.489892
3.468
3.459
3.448
3.436
3.423
3.409
3.379
3.363
3.347
3.330
3.313
3.296
3.278
3.260
3.242
3.205
3.186
3.168
3.149
3.129
3.110
3.091
3.072
3.052
3.032
3.013
2.973
2.914
1400

WatPrcharl R Pnnrl Inntits
A =
12.6 ac
C (rational C) =
0.86
CN (curve number) =
93
H =
32 ft
L =
2830 ft
Tc (Kirpich) =
20.0 min
Stage Storage:
Ks =
22845
b =
1.1051
Zo (Z inv) =
275.0 ft
Intial depth, perm pool, Zi =
279.0 ft
Riser and Barrel:
Dr (riser diameter) =
48 in
Cw (weir coefficient) =
3.33
Zcr (riser crest elev.) =
282.1 ft
Db (barrel diameter) =
20 in
Cd (discharge coeff) =
0.51
Zinv (barrel inv. elev.) =
275.0 ft
Drawdown, Perforated Riser:
rows =
1
holes/row =
6
N, holes =
6
D hole =
4 in
A orifice =
75 sq in
Deff =
9.80 in
Cd =
0.51
Inv =
279.0 ft
Emergency Spillway
L =
20.0 ft
Zcr =
284.00 ft
Cw =
3.0
Storm Data for 10 Year Storm:
g =
197.702
h =
22.2317
P =
5.12 in
S =
0.75 in
Q. =
4.32 in
I =
4.7 in/hr
Qp =
50.78 cfs
T =
46.59 min
dT =
5 min
nin]
[cfs]
[ft]
ft msl
[cu ft]
[cfs]
[cfs]
tcrs]
tcrsJ
LGMJ
tc15]
tc15j
0
0.000
0.00
279.00
0.87
0.000
0.000
0.000
15.864
0.000
0.000
0.000
60
5
1.430
0.03
279.03
429.77
0.000
0.008
0.008
15.933
0.008
0.000
0.008
10
5.558
0.05
279.05
856.14
0.000
0.022
0.022
15.992
0.022
0.000
0.022
50
15
11.919
0.14
279.14
2516.99
0.000
0.093
0.093
16.201
0.093
0.000
0.093
40
20
19.798
0.30
279.30
6064.80
0.000
0.307
0.307
16.601
0.307
0.000
0.307
30
25
28.306
0.55
279.55
11911.92
0.000
0.768
0.768
17.198
0.768
0.000
0.768
3
30
36.485
0.89
279.89
20173.24
0.000
1.491
1.491
17.963
1.491
0.000
1.491
,° 20
35
43.415
1.31
280.31
30671.71
0.000
2.027
2.027
18.853
2.027
0.000
2.027
10
40
48.315
1.78
280.78
43088.31
0.000
2.502
2.502
19.819
2.502
0.000
2.502
45
50.633
2.28
281.28
56832.24
0.000
2.928
2.928
20.808
2.928
0.000
2.928
0
50
50.107
2.80
281.80
71143.63
0.000
3.306
3.306
21.767
3.306
0.000
3.306
55
46.798
3.29
282.29
85184.17
3.466
3.632
7.098
22.652
7.098
0.000
7.098
60
41.305
3.70
282.70
97094.23
19.624
3.884
23.508
23.367
23.367
0.000
23.367
65
35.925
3.89
282.89
102475.59
29.319
3.992
33.311
23.680
23.680
0.000
23.680
70
31.247
4.01
283.01
106149.31
36.614
4.063
40.677
23.890
23.890
0.000
23.890
75
27.177
4.09
283.09
108356.30
41.236
4.105
45.342
24.015
24.015
0.000
24.015
80
23.638
4.12
283.12
109304.93
43.276
4.124
47.399
24.069
24.069
0.000
24.069
85
20.560
4.12
283.12
109175.69
42.996
4.121
47.117
24.062
24.062
0.000
24.062
90
17.882
4.08
283.08
108125.10
40.744
4.101
44.845
24.002
24.002
0.000
24.002
95
15.553
4.02
283.02
106289.04
36.901
4.066
40.967
23.898
23.898
0.000
23.898
100
13.528
3.93
282.93
103785.59
31.861
4.017
35.878
23.755
23.755
0.000
23.755
105
11.766
3.83
282.83
100717.38
26.016
3.957
29.973
23.578
23.578
0.000
23.578
110
10.234
3.71
282.71
97173.73
19.758
3.886
23.643
23.371
23.371
0.000
23.371
115
8.901
3.57
282.57
93232.39
13.486
3.804
17.290
23.139
17.290
0.000
17.290
120
7.742
3.48
282.48
90715.60
9.908
3.752
13.660
22.988
13.660
0.000
13.660
125
6.733
3.42
282.42
88940.13
7.610
3.714
11.324
22.881
11.324
0.000
11.324
130
5.857
3.37
282.37
87562.93
5.970
3.684
9.654
22.798
9.654
0.000
9.654
135
5.094
3.33
282.33
86423.71
4.715
3.659
8.375
22.728
8.375
0.000
8.375
140
4.430
3.30
282.30
85439.48
3.713
3.638
7.350
22.668
7.350
0.000
7.350
145
3.853
3.27
282.27
84563.48
2.889
3.618
6.508
22.614
6.508
0.000
6.508
150
3.352
3.24
282.24
83767.18
2.203
3.601
5.803
22.565
5.803
0.000
5.803
155
2.915
3.21
282.21
83031.70
1.625
3.584
5.210
22.520
5.210
0.000
5.210
160
2.535
3.19
282.19
82343.34
1.141
3.569
4.709
22.477
4.709
0.000
4.709
165
2.205
3.17
282.17
81691.17
0.737
3.554
4.291
22.437
4.291
0.000
4.291
170
1.918
3.15
282.15
81065.42
0.409
3.540
3.949
22.398
3.949
0.000
3.949
175
1.668
3.12
282.12
80456.09
0.159
3.526
3.685
22.360
3.685
0.000
3.685
180
1.451
3.10
282.10
79851.12
0.007
3.512
3.519
22.322
3.519
0.000
3.519
185
1.262
3.08
282.08
79230.62
0.000
3.498
3.498
22.283
3.498
0.000
3.498
190
1.098
3.06
282.06
78559.83
0.000
3.483
3.483
22.241
3.483
0.000
3.483
195
0.955
3.03
282.03
77844.38
0.000
3.466
3.466
22.196
3.466
0.000
3.466
200
0.830
3.01
282.01
77091.02
0.000
3.448
3.448
22.148
3.448
0.000
3.448
205
0.722
2.98
281.98
76305.64
0.000
3.430
3.430
22.099
3.430
0.000
3.430
210
0.628
2.95
281.95
75493.35
0.000
3.411
3.411
22.047
3.411
0.000
3.411
215
0.546
2.92
281.92
74658.61
0.000
3.391
3.391
21.994.
3.391
0.000
3.391
220
0.475
2.89
281.89
73805.28
0.000
3.370
3.370
21.939
3.370
0.000
3.370
225
0.413
2.86
281.86
72936.75
0.000
3.349
3.349
21.883
3.349
0.000
3.349
230
0.360
2.83
281.83
72055.94
0.000
3.328
3.328
21.826
3.328
0.000
3.328
235
0.313
2.80
281.80
71165.40
0.000
3.306
3.306
21.769
3.306
0.000
3.306
240
0.272
2.76
281.76
70267.38
0.000
3.284
3.284
21.710
3.284
0.000
3.284
245
0.237
2.73
281.73
69363.79
0.000
3.261
3.261
21.651
3.261
0.000
3.261
250
0.206
2.70
281.70
68456.33
0.000
3.239
3.239
21.592
3.239
0.000
3.239
255
0.179
2.67
281.67
67546.47
0.000
3.216
3.216
21.532
3.216
0.000
3.216
260
0.156
2.63
281.63
66635.48
0.000
3.192
3.192
21.472
3.192
0.000
3.192
265
0.135
2.60
281.60
65724.48
0.000
3.169
3.169
21.411
3.169
0.000
3.169
270
0.118
2.57
281.57
64814.43
0.000
3.145
3.145
21.351
3.145
0.000
3.145
275
0.102
2.54
281.54
63906.20
0.000
3.121
3.121
21.290
3.121
0.000
3.121
280
0.089
2.50
281.50
63000.51
0.000
3.097
3.097
21.229
3.097
0.000
3.097
285
0.077
2.47
281.47
62098.00
0.000
3.073
3.073
21.168
3.073
0.000
3.073
290
0.067
2.44
281.44
61199.25
0.000
3.049
3.049
21.107
3.049
0.000
3.049
295
0.059
2.41
281.41
60304.73
0.000
3.025
3.025
21.046
3.025
0.000
3.025
300
0.051
2.37
281.37
59414.88
0.000
3.000
3.000
20.986
3.000
0.000
3.000
305
0.044
2.34
281.34
58530.07
0.000
2.976
2.976
20.925
2.976
0.000
2.976
310
0.039
2.31
281.31
57650.63
0.000
2.951
2.951
20.864
2.951
0.000
2.951
315
0.034
2.28
281.28
56776.84
0.000
2.926
2.926
20.804
2.926
0.000
2.926
320
0.029
2,25
281.25
55908,95
0.000
2.902
2.902
20.743
2.902
0.000
2.902
325
0.025
2.22
281.22
55047.19
0.000
2.877
2.877
20.683
2.877
0.000
2.877
330
0.022
2.19
281.19
54191.74
0.000
2.852
2.852
20.623
2.852
0.0001
2.852
Qin vs Qout
0 200 400 600 800 1000
Time (minutes)
-Qin -gout
Max Stage Elev.
283.1226
Stage at 24hr (1440 min)
0.09
Stage at 2 days (2880 min)
0.02
Stage at 3 days (4320 min)
0.01
Stage at 4 days (5760 min)
0.00
Stage at 5 days (7200 min)
0.00
Peak Discharge
24.06883
1200 1400

Watershed & Pond Inputs
A =
12.6 ac
C (rational C) =
0.86
CN (curve number) =
93
H =
32 ft
L =
2830 ft
Tc (Kirpich) =
20.0 min
Stage Storage:
Ks =
22845
b =
1.1051
Zo (Z inv) =
275.0 ft
Intial depth, perm pool, Zi =
279.0 ft
Riser and Barrel:
Dr (riser diameter) =
48 in
Cw (weir coefficient) =
3.33
Zcr (riser crest elev.) =
282.1 ft
Db (barrel diameter) =
20 in
Cd (discharge coeff) =
0.51
Zinv (barrel inv. elev.) =
275.0 ft
Drawdown, Perforated Riser:
rows =
1
holes/row =
6
N, holes =
6
D hole =
4 in
A orifice =
75 sq in
Deff =
9.80 in
Cd =
0.51
Inv =
279.0 ft
Emergency Spillway
L =
20.0 ft
Zcr =
284.00 ft
Cw =
3.0
Storm Data for 25 Year Storm:
g =
235.043
h =
24.1978
P =
6.11 in
S =
0.75 in
Q. =
5.29 in
I =
5.3 in/hr
Qp =
57.68 cfs
Tp =
50.28 min
dT =
5 min
nin]
[cfs]
[ft]
ft msl
[cu ft]
[cfs]
[cfs]
[cfs]
[cfs]
[cts]
0
0.000
0.00
279.00
0.87
0.000
0.000
0.000
15.864
0.000
5
1.396
0.03
279.03
419.68
0.000
0.008
0.008
15.931
0.008
10
5.449
0.05
279.05
836.04
0.000
0.021
0.021
15.989
0.021
15
11.767
0.13
279.13
2464.48
0.000
0.091
0.091
16.195
0.091
20
19.737
0.30
279.30
5967.28
0.000
0.301
0.301
16.591
0.301
25
28.589
0.55
279.55
11798.20
0.000
0.758
0.758
17.186
0.758
30
37.465
0.89
279.89
20147.38
0.000
1.489
1.489
17.961
1.489
35
45.506
1.32
280.32
30940.13
0.000
2.038
2.038
18.874
2.038
40
51.934
1.81
280.81
43980.40
0.000
2.532
2.532
19.885
2.532
45
56.125
2.35
281.35
58800.81
0.000
2.983
2.983
20.944
2.983
50
57.676
2.92
281.92
74743.43
0 000
3.393
3.393
21.999
3.393
55
56.434
3.49
282.49
91028.30
10.333
3.758
14.091
23.007
14.091
60
52.522
3.93
282.93
103731.23
31.754
4.016
35.771
23.752
23.752
65
46.626
4.23
283.23
112362.13
50.056
4.181
54.236
24.240
24.240
70
40.972
4.45
283.45
119077.92
59.769
4.304
64.073
24.611
24.611
75
36.003
4.62
283.62
123986.13
63.321
4.391
67.712
24.877
24.877
80
31.637
4.73
283.73
127323.84
65.620
4.449
70.069
25.056
26.056
85
27.800
4.80
283.80
129298.04
66.940
4.483
71.423
25.161
25.161
90
24.429
4.83
283.83
130089.74
67.461
4.497
71.958
25.203
25.203
95
21.466
4.82
283.82
129857.44
67.309
4.493
71.802
25.191
25.191
100
18.863
4.78
283.78
128740.07
66.569
4.474
71.043
25.132
25.132
105
16.576
4.72
283.72
126859.51
65.305
4.441
69.747
25.032
25.032
110
14.565
4.63
283.63
124322.73
63.557
4.397
67.954
24.896
24.896
115
12.799
4.53
283.53
121223.71
61.349
4.342
65.691
24.728
24.728
120
11.247
4.41
283.41
117645.04
62.475
4.278
66.753
24.533
24.533
125
9.883
4.27
283.27
113659.34
53.025
4.205
57.230
24.312
24.312
130
8.684
4.12
283.12
109330.50
43.331
4.124
47.455
24.070
24.070
135
7.631
3.97
282.97
104714.77
33.704
4.035
37.740
23.808
23.808
140
6.706
3.80
282.80
99861.69
24.455
3.940
28.395
23.528
23.528
145
5.893
3.62
282.62
94814.92
15.911
3.837
19.748
23.232
19.748
150
5.178
3.48
282.48
90658.24
9.831
3.750
13.581
22.985
13.581
155
4.550
3.39
282.39
88137.22
6.638
3.696
10.335
22.833
10.335
160
3.998
3.33
282.33
86401.87
4.692
3.659
8.351
22.727
8.351
165
3.513
3.29
282.29
85096.04
3.382
3.630
7.012
22.647
7.012
170
3.087
3.25
282.25
84046.46
2.436
3.607
6.043
22.583
6.043
175
2.713
3.22
282.22
83159.67
1.722
3.587
5.309
22.528
5.309
180
2.384
3.19
282.19
82380.93
1.166
3.570
4.735
22.480
4.735
185
2.095
3.17
282.17
81675.55
0.728
3.554
4.282
22.436
4.282
190
1.841
3.14
282.14
81019.45
0.388
3.539
3.927
22.395
3.927
195
1.618
3.12
282.12
80393.69
0.138
3.525
3.662
22.356
3.662
200
1.421
3.10
282.10
79780.22
0.001
3.511
3.511
22.318
3.511
205
1.249
3.08
282.08
79153.27
0.000
3.496
3.496
22.278
3.496
210
1.098
3.05
282.05
78479.11
0.000
3.481
3.481
22.236
3.481
215
0.964
3.03
282.03
77764.18
0.000
3.464
3.464
22.191
3.464
220
0.847
3.00
282.00
77014.30
0.000
3.447
3.447
22.144
3.447
225
0,745
2.98
281.98
76234.59
0.000
3.428
3.428
22.094
3.428
230
0.654
2.95
281.95
75429.54
0.000
3.409
3.409
22.043
3.409
235
0.575
2.92
281.92
74603.11
0.000
3.389
3.389
21.990
3.389
240
0.505
2.89
281.89
73758.78
0.000
3.369
3.369
21.936
3.369
245
0.444
2.86
281.86
72899.61
0.000
3.348
3.348
21.881
3.348
250
0.390
2.83
281.83
72028.27
0.000
3.327
3.327
21.825
3.327
255
0.343
2.80
281.80
71147.15
0.000
3.306
3.306
21.767
3.306
260
0,301
2.76
281.76
70258.31
0.000
3.284
3.284
21.710
3.284
265
0.265
2.73
281.73
69363.59
0.000
3.261
3.261
21.651
3.261
270
0.233
2.70
281.70
68464.59
0.000
3.239
3.239
21.592
3.239
275
0.204
2.67
281.67
67562.73
0.000
3.216
3.216
21.533
3.216
280
0.180
2.64
281.64
6665926
0.000
3.193
3.193
21.473
3.193
285
0.158
2.60
281.60
65755.28
0.000
3.170
3.170
21.413
3.170
290
0.139
2.57
281.57
64851.74
0.000
3.146
3.146
21.353
3.146
295
0.122
2.54
281.54
63949.50
0.000
3.123
3.123
21.293
3.123
300
0,107
2.51
281.51
63049.31
0.000
3.099
3.099
21.232
3.099
305
0.094
2.47
281.47
62151.83
0.000
3.075
3.075
21.172
3.075
310
0.083
2.44
281.44
61257.64
0.000
3.051
3.051
21.111
3.051
315
0.073
2.41
281.41
60367.24
0.000
3.026
3.026
21.051
3.026
320
0.064
2.38
281.38
59481.10
0.000
3.002
3.002
20.990
3.002
325
0.056
2.35
281.35
58599.61
0.000
2.978
2.978
20.930
2.978
330
0.049
2.31
281.31
57723.12
0.000
2.953
2.953
20.869
2.953
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.
0.
0.
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
[cfs]
0.000 �o
0.008
0.021 i0
0.091 so
0.301 40
0.758 3 30
1.489 20
2.038
2.532 10
n no* n
3.39°
14.091
23.752
24.611
Qin vs Qout
100 200 300 400 500 500 700 860 900
Time (minutes)
-Qin -gout
25.056
Max Stage Elev.
25.161
Stage at 24hr (1440 min)
25.203
Stage at 2 days (2880 min)
25.191
Stage at 3 days (4320 min)
25.132
Stage at 4 days (5760 min)
25.032
Stage at 5 days (7200 min)
24.8961
Peak Discharge
24.728
24.533
24.312
24.070
23.808
23.528
19.748
13.581
10.335
8.351
7.012
6.043
5.309
4.735
4.282
3.927
3.662
3.511
3.496
3.481
3.428
3.409
3.389
3.369
3.348
3.261
3.216
3.193
3.170
3.146
3.123
3.099
3.075
3.051
3.026
3.002
283.826
0.10
0.02
0.01
0.00
0.00
25.20329 cfs
Peak ES Discharge 0.000 cfs
Velocity over emergency spillway at max stage
cross -sectional area = 796.5199 cfs
velocity (V) = 0 f/s
max velocity for grass lined channel is 4 fUs

Watershed & Pond
A =
12.6 ac
[min]
[cfs]
[ft]
ft msl
[cu ft]
[cfs]
[cfs]
[cfs]
[cfs]
[cfs]
[cfs]
[cfs]
C (rational C) =
0.86
0
0.000
0.00
279.00
0.87
0.000
0.000
0.000
15.864
0.000
0.000
0.000
CN (curve number) =
93
5
1.398
0.03
279.03
420.39
0.000
0.008
0.008
15.931
0.008
0.000
0.008
H =
32 ft
10
5.470
0.05
279.05
837.45
0.000
0.021
0.021
15.989
0.021
0.000
0.021
L =
2830 ft
15
11.855
0.13
279.13
2472.21
0.000
0.091
0.091
16.195
0.091
0.000
0.091
Tc (Kirpich) =
20.0 min
20
25
30
19.990
29.156
38.542
0.30
0.55
0.90
279.30
279.55
279.90
6001.55
11907.69
20424.03
0.000
0.000
0.000
0.303
0.768
1.506
0.303
0.768
1.506
16.594
17.197
17.986
0.303
0.768
1.506
0.000
0.000
0.000
0.303
0.768
1.506
Storage:
Ks = 22845
b =
1.1051
35
47.320
1.34
280.34
31534.88
0.000
2.064
2.064
18.922
2.064
0.000
2.064
Zo (Z inv) =
275.0 ft
40
54.715
1.85
280.85
45111.82
0.000
2.570
2.570
19.969
2.570
0.000
2.570
Intial depth, perm pool, Zi =
279.0 ft
45
50
55
60.072
62.919
63.005
2.42
3.03
3.66
281.42
282.03
282.66
60755.31
77865.89
95701.80
0.000
0.000
17.326
3.037
3.466
3.856
3.037
3.466
21.181
21.077
22.197
23.285
3.037
3.466
21.181
0.000
0.000
0.000
3.037
3.466
21.181
and Barrel:
Dr (riser diameter) = 48 in
Cw (weir coefficient) =
3.33
60
60.321
4.09
283.09
108248.86
41.007
4.103
45.110
24.009
24.009
0.000
24.009
Zcr (riser crest elev.) =
282.1 ft
65
55.104
4.46
283.46
119142.26
59.817
4.305
64.122
24.615
24.615
0.000
24.615
Db (barrel diameter) =
20 in
70
48.797
4.77
283.77
128289.11
66.269
4.466
70.735
25.108
25.108
0.000
25.108
Cd (discharge coeff) =
0.51
75
43.130
5.00
284.00
135395.78
70.850
4.587
75.437
25.482
25.482
0.014
25.496
Zinv (barrel inv. elev.) =
275.0 ft
80
85
90
38.121
33.693
29.780
5.18
5.26
5.26
284.18
284.26
284.26
140685.87
143016.70
143004.00
74.063
75.432
75.424
4.674
4.712
4.712
78.737
80.144
80.136
25.756
25.875
25.875
25.756
25.875
25.875
4.595
7.860
7.841
30.351
33.736
33.716
down, Perforated Riser:
rows = 1
holes/row =
6
95
26.322
5.22
284.22
141823.37
74.734
4.692
79.427
25.814
25.814
6.117
31.931
N, holes =
6
100
23.265
5.16
284.16
140140.56
73.739
4.665
78.404
25.728
25.728
3.919
29.646
D hole =
4 in
105
20.563
5.10
284.10
138226.11
72.588
4.634
77.222
25.629
25.629
1.850
27.479
A orifice =
75 sq in
110
18.175
5.03
284.03
136151.36
71.319
4.599
75.918
25.521
25.521
0.297
25.818
Deff =
9.80 in
115
16.064
4.95
283.95
133858.39
69.886
4.561
74.447
25.402
25.402
0.000
25.402
Cd =
0.51
120
14.199
4.86
283.86
131057.12
68.093
4.513
72.606
25.254
25.254
0.000
25.254
Inv =
279.0 ft
125
130
135
12.550
11.092
9.804
4.75
4.62
4.48
283.75
283.62
283.48
127740.35
123981.65
119846.13
65.901
63.318
60.339
4.457
4.391
4.318
70.357
67.709
64.657
25.079
24.877
24.653
25.079
24.877
24.653
0.000
0.000
0.000
25.079
24.877
24.653
ency Spillway
L = 20.0 ft
Zcr =
284.00 ft
140
8.665
4.33
283.33
115391.38
57.072
4.237
61.309
24.408
24.408
0.000
24.408
Cw =
3.0
145
150
155
7.659
6.769
5.983
4.17
4.00
3.82
283.17
283.00
282.82
110668.43
105722.46
100593.56
46.261
35.740
25.788
4.149
4.055
3.954
50.410
39.795
29.743
24.145
23.866
23.571
24.145
23.866
23.571
0.000
0.000
0.000
24.145
23.866
23.571
i Data for 50 Year Storm:
g = 268.689
h =
26.0264
160
5.288
3.64
282.64
95317.28
16.708
3.848
20.555
23.262
20.555
0.000
20.555
P =
6.91 in
165
170
4.674
4.131
3.48
3.39
282.48
282.39
90737.25
88032.64
9.938
6.515
3.752
3.694
13.690
10.209
22.989
22.826
13.690
10.209
0.000
0.000
13.690
10.209
S = 0.75 in
Q` =
6.08 in
175
3.652
3.33
282.33
86209.38
4.490
3.655
8.145
22.715
8.145
0.000
8.145
1 =
5.8 in/hr
180
185
3.227
2.853
3.28
3.24
282.28
282.24
84861.37
83793.61
3.162
2.224
3.625
3.601
6.787
5.826
22.633
22.567
6.787
5.826
0.000
0.000
6.787
5.826
Qp = 63.31 cfs
Tp =
52.65 min
190
195
200
2.521
2.229
1.970
3.21
3.18
3.16
282.21
282.18
282.16
82901.73
82124.87
81424.58
1.530
0.999
0.590
3.581
3.564
3.548
5.111
4.563
4.138
22.512
22.464
22.420
5.111
4.563
4.138
0.000
0 000
0.000
5.111
4.563
4.138
dT = 5 min
205
1.741
3.14
282.14
80774.18
0.280
3.533
3.813
22.380
3.813
0.000
3.813
210
1.539
3.11
282.11
80152.50
0.067
3.519
3.586
22.341
3.586
0.000
3.586
215
1.360
3.09
282.09
79538.35
0.000
3.505
3.505
22.303
3.505
0.000
3.505
220
1.202
3.07
282.07
78894.85
0.000
3.490
3.490
22.262
3.490
0.000
3.490
225
1.063
3.05
282.05
78208.40
0.000
3.474
3.474
22.219
3.474
0.000
3.474
230
0.939
3.02
282.02
77484.84
0.000
3.458
3.458
22.173
3.458
0.000
3.458
235
0.830
2.99
281.99
76729.32
0.000
3.440
3.440
22.125
3.440
0.000
3.440
240
0.734
2.97
281.97
75946.38
0.000
3.421
3.421
22.076
3.421
0.000
3.421
245
0.648
2.94
281.94
75140.06
0.000
3.402
3.402
22.024
3.402
0.000
3.402
250
0.573
2.91
281.91
74313.91
0.000
3.383
3.383
21.972
3.383
0.000
3.383
255
0.507
2.88
281.88
73471.08
0.000
3.362
3.362
21.918
3.362
0.000
3.362
260
0.448
2.85
281.85
72614.37
0.000
3.342
3.342
21.862
3.342
0.000
3.342
265
0.396
2.82
281.82
71746.23
0.000
3.320
3.320
21.806
3.320
0.000
3.320
270
0.350
2.79
281.79
70868.84
0.000
3.299
3.299
21.749
3.299
0.000
3.299
275
0.309
2.75
281.75
69984.14
0.000
3.277
3.277
21.692
3.277
0.000
3.277
280
0.273
2.72
281.72
69093.82
0.000
3.255
3.255
21.634
3.255
0.000
3.255
285
0.242
2.69
281.69
68199.41
0.000
3.232
3.232
21.575
3.232
0.000
3.232
290
0.213
2.66
281.66
67302.22
0.000
3.209
3.209
21.516
3.209
0.000
3.209
295
0.189
2.63
281.63
66403.46
0.000
3.186
3.186
21.456
3.186
0.000
3.186
300
0.167
2.59
281.59
65504.15
0.000
3.163
3.163
21.397
3.163
0.000
3.163
305
0.147
2.56
281.56
64605.24
0.000
3.140
3.140
21.337
3.140
0.000
3.140
310
0.130
2.53
281.53
63707.55
0.000
3.116
3.116
21.277
3.116
0 000
3.116
315
0.115
2.50
281.50
62811.79
0.000
3.092
3.092
21.216
3.092
0.000
3.092
320
0.102
2.47
281.47
61918.61
0.000
3.069
3.069
21.156
3.069
0.000
3.069
325
0.090
2.43
281.43
61028.59
0.000
3.044
3.044
21.096
3.044
0.000
3.044
330
0.0801
2.40
281.40
60142.24
0.000
3.020
3.020
21.035
3.020
0.0001
3.020
70
60
50
40
3 30
_o
" 20
10
0�
0
Qin vs Qout
'00 200 300 400 Soo
Time (minutes)
-Qin -gout
Max Stage Elev.
284.2579
Stage at 24hr (1440 min)
0.10
Stage at 2 days (2880 min)
0.02
Stage at 3 days (4320 min)
0.01
Stage at 4 days (5760 min)
0.00
Stage at 5 days (7200 min)
0.00
Peak Discharge
33.73581 cfs
Peak ES Discharge 7.860 cfs
600 700 Soo 9W
Velocity over emergency spillway at max stage
cross -sectional area = 805.1589 cfs
velocity (V) = 0.009763 f/s
max velocity for grass lined channel is 4 ft/s

Watershed & Pond In
A =
12.6 ac
[min]
[cfs]
[ft]
ft msl
[cu ft]
[cfs]
[cfs]
[cfs]
[cfs]
[cfs]
[cfs]
[cfs]
Qin vs QOut
C (rational C) =
0.86
0
0.000
0.00
279.00
0.87
0.000
0.000
0.000
15.864
0.000
0.000
0.000
CN (curve number) =
93
6
1.988
0.04
279.04
716.68
0.000
0.017
0.017
15.973
0.017
0.000
0.017
80
H =
32 ft
12
7.723
0.08
279.08
1426.39
0.000
0.043
0.043
16.066
0.043
0.000
0.043
70
L =
2830 ft
18
16.538
0.22
279.22
4191.05
0.000
0.186
0.186
16.395
0.186
0.000
0.186
60
Tc (Kirpich) =
20.0 min
24
30
36
27.410
39.078
50.188
0.48
0.88
1.41
279.48
279.88
280.41
10077.57
19724.75
33266.25
0.000
0.000
0.000
0.612
1.463
2.136
0.612
1.463
2.136
17.017
17.924
19.061
0.612
1.463
2.136
0.000
0.000
0.000
0.612
1.463
2.136
so
3 40
° 30
Storage:
Ks = 22845
b =
1.1051
42
59.450
2.05
281.05
50564.79
0.000
2.743
2.743
20.366
2.743
0.000
2.743
20
Zo (Z inv) =
275.0 ft
48
65.789
2.79
281.79
70979.09
0.000
3.302
3.302
21.757
3.302
0.000
3.302
10
Intial depth, perm pool, Zi =
279.0 ft
54
60
66
68.471
67.182
62.074
3.58
4.21
4.73
282.58
283.21
283.73
93474.67
111767.16
127238.29
13.849
48.712
65.562
3.809
4.170
4.448
17.658
52.882
70.010
23.153
24.207
25.052
17.658
24.207
25.052
0.000
0.000
0.000
17.658
24.207
25.052
0
0 200 400 600 goo 1000 1200
Time (minutes)
and Barrel:
Dr (riser diameter) = 48 in
Cw (weir coefficient) =
3.33
72
54.342
5.18
284.18
140566.40
73.992
4.672
78.664
25.750
25.750
4.444
30.194
Zcr (riser crest elev.) =
282.1 ft
78
47.164
5.47
284.47
149259.69
78.971
4.811
83.783
26.192
26.192
19.038
45.230
-Qin --gout
Db (barrel diameter) =
20 in
84
40.935
5.49
284.49
149956.11
79.355
4.822
84.178
26.227
26.227
20.471
46.698
Cd (discharge coeff) =
0.51
90
35.528
5.42
284.42
147881.24
78.205
4.790
82.994
26.122
26.122
16.303
42.426
Zinv (barrel inv. elev.) =
275.0 ft
96
102
108
30.835
26.762
23.228
5.34
5.25
5.17
284.34
284.25
284.17
145398.07
142912.30
140460.78
76.803
75.371
73.929
4.750
4.710
4.670
81.553
80.081
78.600
25.997
25.870
25.744
25.997
25.870
25.744
11.744
7.702
4.312
37.740
33.572
30.056
Max Stage Elev. 284.4883
Stage at 24hr (1440 min) 0.10
Stage at 2 days (2880 min) 0.02
down, Perforated Riser:
rows = 1
holes/row =
6
114
20.160
5.09
284.09
138002.57
72.453
4.630
77.083
25.617
25.617
1.643
27.261
Stage at 3 days (4320 min) 0.01
N, holes =
6
120
17.497
5.01
284.01
135446.17
70.882
4.587
75.469
25.485
25.485
0.024
25.509
Stage at 4 days (5760 min) 0.00
D hole =
4 in
126
15.186
4.91
283.91
132561.89
69.062
4.539
73.601
25.334
25.334
0.000
25.334
Stage at 5 days (7200 min) 0.00
A orifice =
75 sq in
132
13.180
4.79
283.79
128908.69
66.682
4.477
71.158
25.141
25.141
0.000
25.141
Peak Discharge 46.69817 cfs
Deff =
9.80 in
138
11.439
4.64
283.64
124602.89
63.752
4.402
68.155
24.911
24.911
0.000
24.911
Cd =
0.51
144
9.928
4.48
283.48
119753.20
60.271
4.316
64.587
24.648
24.648
0.000
24.648
Peak ES Discharge 20.471 cfs
Inv =
279.0 ft
150
156
162
8.617
7.479
6.491
4.30
4.10
3.90
283.30
283.10
282.90
114454.12
108787.85
102825.95
54.870
42.160
29.993
4.220
4.114
3.999
59.090
46.274
33.991
24.357
24.040
23.700
24.357
24.040
23.700
0.000
0.000
0.000
24.357
24.040
23.700
Velocity over emergency spillway at max stage
cross -sectional area = 809.7655 cfs
ency Spillway
L = 20.0 ft
Zcr =
284.00 ft
168
5.634
3.69
282.69
96630.75
18.849
3.875
22.723
23.340
22.723
0.000
22.723
velocity (V) = 0.025281 Us
Cw =
3.0
174
180
186
4.890
4.244
3.683
3.47
3.37
3.30
282.47
282.37
282.30
90478.56
87437.55
85542.24
9.590
5.827
3.814
3.747
3.681
3.640
13.337
9.508
7.454
22.974
22.790
22.674
13.337
9.508
7.454
0.000
0.000
0.000
13.337
9.508
7.454
max velocity for grass lined channel is 4 fUs
i Data for 100 Year Storm:
g = 301.255
h =
27.6741
192
3.197
3.26
282.26
84184.87
2.555
3.610
6.165
22.591
6.165
0.000
6.165
P =
7.72 in
198
204
2.774
2.408
3.22
3.19
282.22
282.19
83116.24
82216.09
1.689
1.057
3.586
3.566
5.275
4.623
22.525
22.469
5.275
4.623
0.000
0.000
5.275
4.623
S = 0.75 in
Q. =
6.88 in
210
2.090
3.16
282.16
81418.60
0.586
3.548
4.134
22.420
4.134
0.000
4.134
1 =
6.3 in/hr
216
222
1.814
1.574
3.13
3.11
282.13
282.11
80682.60
79976.97
0.243
0.027
3.531
3.515
3.774
3.542
22.374
22.330
3.774
3.542
0.000
0.000
3.774
3.542
Qp = 68.53 cfs
Tp =
55.06 min
228
234
240
1.366
1.186
1.029
3.08
3.06
3.03
282.08
282.06
282.03
79268.53
78500.83
77674.54
0.000
0.000
0.000
3.499
3.481
3.462
3.499
3.481
3.462
22.286
22.237
22.185
3.499
3.481
3.462
0.000
0.000
0.000
3.499
3.481
3.462
dT = 6 min
246
0.893
3.00
282.00
76798.77
0.000
3.441
3.441
22.130
3.441
0.000
3.441
252
0.775
2.96
281.96
75881.44
0.000
3.420
3.420
22.072
3.420
0.000
3.420
258
0.673
2.93
281.93
74929.41
0.000
3.397
3.397
22.011
3.397
0.000
3.397
264
0.584
2.89
281.89
73948.65
0.000
3.374
3.374
21.948
3.374
0.000
3.374
270
0.507
2.86
281.86
72944.34
0.000
3.350
3.350
21.884
3.350
0.000
3.350
276
0.440
2.82
281.82
71920.99
0.000
3.325
3.325
21.818
3.325
0.000
3.325
282
0.382
2.79
281.79
70882.50
0.000
3.299
3.299
21.750
3.299
0.000
3.299
288
0.331
2.75
281.75
69832.27
0.000
3.273
3.273
21.682
3.273
0.000
3.273
294
0.288
2.71
281.71
68773.26
0.000
3.247
3.247
21.613
3.247
0.000
3.247
300
0.250
2.67
281.67
67708.03
0.000
3.220
3.220
21.543
3.220
0.000
3.220
306
0.217
2.63
281.63
66638.82
0.000
3.192
3.192
21.472
3.192
0.000
3.192
312
0.188
2.60
281.60
65567.56
0.000
3.165
3.165
21.401
3.165
0.000
3.165
318
0.163
2.56
281.56
64495.93
0.000
3.137
3.137
21.329
3.137
0.000
3.137
324
0.142
2.52
281.52
63425.42
0.000
3.109
3.109
21.258
3.109
0.000
3.109
330
0.123
2.48
281.48
62357.28
0.000
3.080
3.080
21.186
3.080
0.000
3.080
336
0.107
2.44
281.44
61292.65
0.000
3.052
3.052
21.114
3.052
0.000
3.052
342
0.093
2.40
281.40
60232.47
0.000
3.023
3.023
21.042
3.023
0,000
3.023
348
0.080
2.37
281.37
59177.61
0.000
2.994
2.994
20.969
2.994
0.000
2.994
354
0.070
2.33
281.33
58128.78
0.000
2.965
2.965
20.897
2.965
0.000
2.965
360
0.061
2.29
281.29
57086.64
0.000
2.935
2.935
20.825
2.935
0.000
2.935
366
0.053
2.25
281.25
56051.73
0.000
2.906
2.906
20.753
2.906
0.000
2.906
372
0.046
2.22
281.22
55024.56
0.000
2.876
2.876
20.682
2.876
0.000
2.876
378
0.040
2.18
281.18
54005.55
0.000
2.846
2.846
20.610
2.846
0.000
2.846
384
0.034
2.14
281.14
52995.06
0.000
2.817
2.817
20.539
2.817
0.000
2.817
390
0.030
2.10
281.10
51993.44
0.000
2.787
2.787
20.468
2.787
0.000
2.787
396
0.0261
2.07
281.07
51000.96
0.000
2.757
2.757
20.397
2.757
0.0001
2.757

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Skimmer Basin 2021 2 Runoff Calculations alsx
User Entry
Calculated
RYatersbed Information
A =
15 a:
SCS CN=
-(Indust HSG D)
H=
10ft
k =
787 ft
C (rational C] =
0.76
Optional K =
- From K tab
Tc (Kirpich) -
7 122638 min
�y!eary4 hour storm
8 =
From :-G F tab
h =
From I-GF tahR
Min
a
S=
1.363636 in
Q. '
1.720742 in
I --
4.458714 In/hr
QP =
5.082934 cis
Tp -
2208929 min
dp=0.1•Tp=
2min(rounded)
10-year, 24 hour
storm
8 =
From I-G F tab
It
From I-G F tab
Min
=P =
S .
1.363636 In
Q. •
3.78303 In
1.
6 735023 In/hr
Qp =
7.677926 cis
Tp =
32.14965 min
dp = 0.1-Tp =
3 min (rounded)
V5yea124 hour
8'
From I-G F tab
h =
From I G F tab
1 =
In
5 =
1.363636 in
Q. =
4.731868 In
jr
7.504439 In/hr
Qp =
9.55506 cis
Tp =
36.09027 min
dp=0.1'Tp=
4 min (rounded)
150 year, 24 hour
storm
8=
From I-G F tab
h =
From I-GF tab
Min
I =
S =
1363636 In
Q. =
5.506048 In
1-
8.105473 In/hr
Qp -
9240239 ds
Tp-
3988099 min
dp = 0.1'Tp =
4 min (rounded)
i100-year, 24 hour
storm
8 =
From 1-G F tab
h -
From I-G F tab
1 In
5
1363636 In
Q. =
6.294682 in
1 •
865757 In/hr
QP
986963 ds
Tp
4161534 min
dp • C• 1-Tp
4 min (rounded)
2-year 24 hour 30 year 24 hour 25-year 24 hour 50 year 24 hour 100-year 24 hour
T Qin T Wit T Wit T Q)n T Qin
Time (min) Q(cfs) Time (min) Q(ds) Time (min) Q(cfs) Time (min) Q(ds) Time (min) Q(cfs) 1YR, 24 hr
0 0 0 0 0 0 0 0 0 0 6
2 0 3 0 4 0 4 0 4 0
4 0 6 1 8 1 8 1 8 1 5
6 1 9 1 12 2 12 2 12 2 4
B 1 12 2 16 4 16 3 16 3 '6
30 2 15 3 20 5 20 5 20 5 d s
12 3 18 5 24 6 24 6 24 6
14 4 21 6 28 8 28 8 28 7
16 4 24 7 32 8 32 9 32 9
18 5 27 7 36 9 36 9 36 9 --
20 5 30 8 40 8 40 9 40 30
22 5 33 8 44 8 44 9 44 30 Time, minute:
24 5 36 7 48 7 48 8 48 9
26 5 39 7 52 6 52 7 52 8
28 4 42 6 56 5 56 6 56 7 10 YR, 24 hr
30 4 45 5 60 4 60 5 60 7 9
32 3 48 5 64 4 64 5 64 6 a
34 3 51 4 68 3 68 4 68 5 7
36 3 54 4 72 3 72 4 72 5 6
38 2 57 3 76 2 76 3 76 4 r 5
40 2 60 3 80 2 80 3 8o 4 d 4
42 2 63 3 84 2 84 2 84 3
44 2 66 2 88 2 98 2 88 3
46 1 69 2 92 1 92 2 92 2
48 1 72 2 96 1 96 2 96 2
50 1 75 2 100 1 100 1 100 2
52 1 78 1 104 1 104 1 104 2 71me m Lutes
54 1 81 1 108 1 208 1 208 1
56 1 84 1 112 1 112 1 112 1
58 1 87 1 116 1 116 1 116 1 25 YR, 24 hr
60 1 90 1 120 0 120 1 120 1 9
62 1 93 1 124 0 124 1 124 1 a
64 1 96 1 128 0 128 1 128 1 7
66 0 99 1 132 0 132 0 132 1 6
68 0 102 1 136 0 136 0 136 1 .6
70 0 105 0 140 0 140 0 140 1 d 4
72 0 108 0 144 0 144 0 144 0 -
74 0 111 0 148 0 148 0 148 0
76 0 114 0 152 0 152 0 152 0
78 0 117 0 156 0 156 0 156 0
80 0 120 0 160 0 160 0 160 0
82 0 123 0 164 0 164 0 164 0 T•me, min-•tes
84 0 126 0 168 0 168 0 268 0
86 0 129 0 172 0 172 0 172 0
88 0 132 0 176 0 176 0 176 0 50 YR, 24 hr
90 0 135 0 180 0 180 0 180 0 ,o
92 0 138 0 184 0 184 0 294 0 a
94 0 141 0 198 0 188 0 188 0 a
96 0 144 0 192 0 192 0 192 0 1
98 0 147 0 1% 0 196 0 196 0 6
100 0 150 0 200 0 200 0 200 0 d a
102 0 153 0 204 0 204 0 204 0 s
104 0 156 0 208 0 208 0 208 0
106 0 159 0 212 0 212 0 212 0
208 0 162 0 216 0 216 0 216 0
110 0 165 0 220 0 220 0 220 0
112 0 168 0 224 0 224 0 224 0 7 me, m nutes
114 0 171 0 228 0 228 0 228 0
116 0 174 0 232 0 232 0 232 0
118 0 177 0 236 0 236 0 236 0 100 YR, 24 hr
120 0 180 0 240 0 240 0 240 0
122 0 183 0 244 0 244 0 244 0
124 0 186 0 248 0 248 0 248 0
126 0 189 0 252 0 252 0 252 0
128 0 192 0 256 0 256 0 256 0 r
130 0 195 0 260 0 260 0 260 0 d
132 0 198 0 264 0 264 0 264 0
234 0 201 0 268 0 268 0 268 0
136 0 204 0 272 0 272 0 272 0
138 0 207 0 276 0 276 0 276 0
240 0 210 0 280 0 280 0 280 0
142 0 213 0 284 0 294 0 284 0 I'.ia ' •��°'
144 0 216 0 298 0 298 0 288 0

Skimmer Basin 2021-2 DEMLR Worksheet.xls
Skimmer Basin
Okay
1.39 Disturbed Area (Acres)
7.68 Peak Flow from i0-year Storm (cfs)
2502 Required Volume ft3
2496 Required Surface Area ft2
35.3 Suggested Width ft
70.7 Suggested Length ft
36 Trial Top Width at Spillway Invert ft
72 Trial Top Length at Spillway Invert ft
3 Trial Side Slope Ratio ZA
2 Trial Depth ft (2 to 3.5 feet above grade)
24 Bottom Width ft
60 Bottom Length ft
1440 Bottom Area ft2
3984 Actual Volume ft3 Okay
2592 Actual Surface Area ft2 Okay
12 Trial Weir Length ft
1 Trial Depth of Flow ft
36.0 Spillway Capacity cfs Okay
1.5 Skimmer Size (inches)
0.125 Head on Skimmer (feet)
1 Orifice Size (1/4 inch increments)
3.06 Dewatering Time (days)
Suggest about 3 days

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Skimmer Basin 2021 3 Runoff Calculations xlsx
User Entry
Calculated
aterslxd ln(ormsnon
A
417 ac
SCS CN =
- (Indust HSG DI
H =
26 It
t=
8DO it
C (rational C) =
086
Optional K =
- From K tab
Tc (Klrplch) =
5 024516 min
a-l(ear, 24 hour
storm
8 =
From I G F tab
h =
From I-G FtabP
Min
=
S _
0752698 In
Q' =
2-249006 in
1=
4.864817 In/hr
QP =
17.44621 ds
Tp =
22 34406 min
dp=0.1-Tp=
2 min (rounded)
40-year, 24 hour
storm
From l-GF tab
I=
From I-G-F tab
Min
P =
S=
0-752698 in
Q. =
4-315782 In
1=
7.25347 In/hr
QP =
26.01239 ds
Tp=
30,09571 min
dp=0.1'Tp=
3 min(rounded)
'c!5-year, 24 hour storm
8 =
Fram I-G-F tab
h=
From I-G F tab
P =
in
S =
0.752688 In
Q. =
S 291179 In
I =
8.043247 In/hr
4S Qp =
2884469 ds
Tp=
33.27453 min
dp=0.1'Tp=
3 min(rou,cled)
{+o-year, 24 hour
--
storm
a =
-Ftab
h=
-G Ftab
INFrom:-G
P =
in
In
5 =
0752688 In
Q'=
6082191 In
I =
8653163 in/hr
QP =
3103197 cis
Tp=
3555298 min
dp=0.1•Tp=
4 min (rounded)
7DO year, 24 hour storm
8 =
From I-G F tab
h=
From l-G Ftab
Min
P =
5=
0.752688 in
Q. =
6.88485 in
I =
9213087 In/hr
Qp =
3303997 ds
Tp=
3779898 In
dp=0.1'Tp=
4 min (rounded)
2-year 24 hour 10-year 24 hour 25-year 24 hour 50 year 24 hour 100-year 24 hour
T QIn T QIn T Qln T Qln T QIn
Time (min) Q(ds) Time (min) Q (ds) Time (min) Q (ds) Time (min) Q (ds) Time (min) Q(c6) 1 YR, 24 hr
0 0 0 0 0 0 0 0 0 0
2 0 3 1 3 1 4 1 4 1
4 1 6 2 6 2 8 4 8 4 is
6 3 9 5 9 5 12 8 12 8 1-0
8 5 12 9 12 8 16 13 16 13
30 7 15 13 15 12 20 19 20 18 'T
12 30 18 17 18 16 24 24 24 23
14 12 21 21 21 20 28 28 28 28
16 14 24 23 24 24 32 30 32 31
18 16 27 25 27 26 36 31 36 33
20 17 30 26 30 28 40 30 40 33
22 17 33 25 33 29 44 27 44 31
24 17 36 24 36 28 48 23 48 28
26 16 39 21 39 27 52 20 52 24
28 15 42 18 42 24 56 17 56 21 10 YR, 24 hr
30 13 45 16 45 22 60 15 60 18
32 12 48 14 48 19 64 13 64 16
34 10 51 12 51 17 68 11 68 14
36 9 54 11 54 15 72 30 72 12
38 8 57 10 57 14 76 8 76 11
40 7 60 8 60 12 80 7 80 9
42 7 63 7 63 11 84 6 84 8
44 6 66 7 66 9 88 5 88 7
46 5 69 6 69 8 92 5 92 6
48 5 72 5 72 8 96 4 96 5
50 4 75 4 75 7 100 3 100 5
52 4 78 4 78 6 104 3 104 4 i.me mmuoes
54 3 81 3 81 5 108 3 108 3
56 3 84 3 84 5 112 2 112 3
58 3 87 3 87 4 116 2 116 3 25 YR, 24 hr
60 2 90 2 90 4 120 2 120 2
62 2 93 2 93 3 124 1 124 2
64 2 96 2 96 3 128 1 128 2
66 2 99 2 99 3 132 1 132 2
68 1 102 1 102 2 136 1 136 1 f,
70 1 105 1 105 2 140 1 140 1 d
72 1 108 1 108 2 144 1 144 1
74 1 111 1 111 2 148 1 248 1
76 1 114 1 214 1 152 1 152 1
78 1 117 1 117 1 156 0 2.56 1
80 1 120 1 120 1 160 0 160 1 -
82 1 123 1 123 1 164 0 164 1 • ,+ . c .
84 1 126 0 126 1 168 0 168 0
86 1 129 0 129 1 172 0 172 0
88 0 132 0 132 1 176 0 176 0 50 YR, 24 hr
90 0 135 0 135 1 180 0 ISO 0 -
92 0 138 0 138 1 184 0 284 0
94 0 141 0 141 1 188 0 188 0
96 0 144 0 144 0 192 0 192 0
98 0 147 0 147 0 196 0 1% 0
100 0 150 0 150 0 200 0 200 0 u
102 0 153 0 153 0 204 0 204 0
104 0 156 0 156 0 208 0 208 0
106 0 159 0 159 0 212 0 212 0
108 0 162 0 162 0 216 0 216 0
330 0 165 0 165 0 220 0 220 0
112 0 168 0 168 0 224 0 224 0 T me m •ut<:
214 0 171 0 171 0 228 0 228 0
116 0 174 0 174 0 232 0 232 0
118 0 177 0 177 0 236 0 236 0 100 YR, 24 hr
120 0 180 0 ISO 0 240 0 240 0
122 0 193 0 193 0 244 0 244 0 _
124 0 186 0 286 0 248 0 248 0
126 0 189 0 189 0 252 0 252 0
128 0 192 0 192 0 256 0 256 0 {
130 0 195 0 295 0 260 0 260 0 d .•
232 0 198 0 198 0 264 0 264 0
134 0 201 0 201 0 268 0 268 0
136 0 204 0 204 0 272 0 272 0
139 0 207 0 207 0 276 0 276 0
140 0 210 0 210 0 280 0 280 0
142 0 213 0 213 0 284 0 284 0 I•••e. r•:R•.ies
144 0 216 0 216 0 288 0 298 0

Skimmer Basin 2021-3 DEMLR Worksheet.xls
Skimmer Basin
Okay
4.17 Disturbed Area (Acres)
28.84 Peak Flow from 25-year Storm (cfs)
7506 Required Volume ft3
9373 Required Surface Area ft2
68.5 Suggested Width ft
136.9 Suggested Length ft
60 Trial Top Width at Spillway Invert ft
157 Trial Top Length at Spillway Invert ft
3 Trial Side Slope Ratio Z:1
2 Trial Depth ft (2 to 3.5 feet above grade)
48 Bottom Width ft
145 Bottom Length ft
6960 Bottom Area ft2
16332 Actual Volume ft3 Okay
9420 Actual Surface Area ft2 Okay
18 Trial Weir Length ft
1 Trial Depth of Flow ft
54.0 Spillway Capacity cfs Okay
2 Skimmer Size (inches)
0.167 Head on Skimmer (feet)
1.5 Orifice Size (1/4 inch increments)
3.53 Dewatering Time (days)
Suggest about 3 days