1-Combined Cover -narrative and ESC Calcs

Quarry Phone Numbers:
[phone] - Knightdale
[phone] - Triangle
[phone] - Moncure
[phone] - Nash County
[phone] - N. Myrtle Beach
WAIF STONE
CORPORATION
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.
By Hand Delivery
Adam Parr, PE —Assistant State Mining Engineer
Division of Energy, Mineral and Land Resources
Department of Environmental Quality
1612 Mail Service Center
Raleigh, North Carolina 27699-1612
Re: Knightdale Quarry
Mining Permit No. 92-06
ADI Request dated January 13, 2022
Dear Mr. Parr,
Business Office Address:
P.O. Box 190
6821 Knightdale Blvd.
Knightdale, N.C. 27545
[phone]
Fax: [phone]
January 24, 2022
Please find enclosed supplemental information and revised plans for Mining Permit No. 92-06
(Knightdale Quarry) in response to your ADI letter dated January 13, 2022.
Contents of this package include two copies of:
Narrative Response to items 1-5 of ADI request
Site Plans and Erosion Control Plans (last revised January 19, 2022)
Revised Erosion Control Calculations (including all proposed diversions)
Please feel free to contact me at [phone] or by email at [e-mail] if you
have any questions concerning the revised plans or additional information.
Sincerely,
Wake Stone Corporation
/. 6�t 0,,,4
L. Cole Atkins
Geologist/Environmental Specialist
Enclosures: as noted

Knightdale Quarry
Mining Permit No. 92-06
Response to ADI Letter dated January 13, 2022
1. Please clearly indicate and label on the mine map the areas utilized for plant, stockpiles, process
areas, roads, boneyards, and quarry office and scales on the mine map. The current line weight
and color are only indicated by label and leader line and are also similar in color and line weight
to other use areas. Please consider changing the line weight, color, or dashing and adding a
legend so that these areas are more easily distinguished on the mine map.
To indicate land uses more clearly for affected acreages, I have added a page to the Site Plans
(page 2 of 4) with areas hatched and color coded to match the land use table on each page. As a
reminder, Wake Stone operates under the "blanket" bond for all North Carolina mining
operations.
2. Please clearly indicate and label on the mine map the required diversion ditches for Erosion and
Sediment Control (E&SC) measures. Please provide calculations for these diversion ditches.
Each diversion ditch (or section) has been clearly identified and labeled on page 3 of 4 of the
revised Plans. Ditch designs and calculations have been appended to the attached "Erosion
Control Calculations" revised January 19, 2022.
3. Please provide construction drawings and maintenance details for all E&SC measures including
but not limited to silt fence, construction entrance, stilling basins, energy dissipators, etc.
Standard construction drawings and maintenance details have been added to Site Plans (page 4
of 4).
4. Please provide construction details and cross sections for proposed screening berms. Please
clearly indicate and label on the mine map the location of new screening berms.
Proposed berm cross section (as labeled on Site Plan, page 3 of 4) is illustrated on Site Plan
Detail sheet (page 4 of 4). Typical fill slope details are also illustrated on page 4 of 4 of the
revised Site Plans.
5. Affected land includes nonpublic roads. Please clarify how the access road going to the west will
be permanently barricaded to prevent access from the area that is proposed to be removed
from the mine permit boundary.
The access road to the west (where the 38.97 acres will be removed from the mining permit
boundary) was illustrated on the base map from outdated mapping. The maps have been
revised to show that the road now terminates at the proposed permit boundary. This road now
dead ends into a graded fill slope for the adjacent Hinton Oaks Industrial Park and is not
accessible to public entry.

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
Revised January 19, 2022
Prepared by:
L. Cole Atkins
Geologist/ Environmental Specialist
Wake Stone Corporation
PO Box 190
Knightdale, NC 27545

Drainage Area Map for Erosion
& Sediment Control Measures
Ilk17
I � e
- Area B
2021-1 Wet Pond
DrainagePtrea 9P
12.6 Acres
-�
2021-2 Skimmer Basi
amageArea
1.5 Acres
� ,� i r,•, war /��
� r 1.-_�_� L—v�
r
2021-3 Skimmer B i
r`
[ 9rainage Area
� I["! %Acres
— 'IFIV
ar
Fred Smith Cbm a y
Asphalt Plo n�0
SHNIK.,IIA101,. iI_Ik
ine denotes rea ut for 1
' i I�larr 5tockp11e\�\ Fro
0 1200
600
Feet

Wet Detention Pond 2021-1 Size Calculations.xlsx
Total Acres:
12.6
Total Imp Ac:
12
Percent Impervious:
95.24
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
required min depth, ft
SA/DA
SA, ac
SA, ft2
3
3.407142857
0.4293
18700.308
14921.0424
13282.3152
_
4
2.718571429
0.34254
5
2.42
0.30492
6
2.197142857
0.27684
12059.1504
_
7
1.944761905
0.24504
10673.9424
8
1.673809524
0.2109
9186.804
Contour
SA, ft2
Incr. Vol. ft:
Cum. Vol. ft3
275
14458
276
15898
15178
15178
277
17394
16646
31824
278
279
280
- - - 189451
21707
24597
18169.5
20326
23152
49993.51
70319.5
93471.5
281
26344
25470.5
118942
282
28125
27234.5
146176.5
283
_
29940
29032.5
175209
_
294
31790
30865
206074
Permanent pool volume:
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 1
15%
20%
Forebay Volume shall be between 15%and 20%of main pool
10547.925
14063.9
Pond Design (from attached schematics and "Pond Design final' spreadsheet
Permanent Pool Surface Area (not including forebays) =
21707
ft2
*meets min. required per SA/DA chart above
Permanent Pool Depth (excluding 6" sediment storage) =
4
ft
_
Permanent Pool Volume (excluding 6" sediment storage) =
70319.5
ft3
Permanent Pool Elevation =
279,ft
above msl
Emergency Spillway Elevation =
284 Ift
above msl
Crest of Dam Elevation =
285
ft above msl
Barrel and Riser set at Elevation:
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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Watarshad P. 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
W =
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]
[cfs]
[cfs]
[cfs]
Qin vs Qout
0
0.000
0.00
279.00
0.87
0.000
0.000
0.000
15.864
0.000
0.000
0.000
4
0.922
0.02
279.02
222.11
0.000
0.003
0.003
15.902
0.003
0.000
0.003
35
8
3.581
0.03
279.03
442.53
0.000
0.009
0.009
15.934
0.009
0.000
0.009
30
12
7.671
0.07
279.07
1299.89
0.000
0.038
0.038
16.050
0.038
0.000
0.038
25
16
12.721
0.17
279.17
3131.87
0.000
0.125
0.125
16.274
0.125
0.000
0.125
- zo
20
18.147
0.31
279.31
6154.74
0.000
0.313
0.313
16.611
0.313
0.000
0.313
0 15
24
23.325
0.49
279.49
10434.79
0.000
0.642
0.642
17.052
0.642
0.000
0.642
-
28
27.657
0.72
279.72
15878.72
0.000
1.135
1.135
17.574
1.135
0.000
1.135
1
32
30.644
0.98
279.98
22244.12
0.000
1.612
1.612
18.145
1.612
0.000
1.612
5
36
31.942
1.25
280.25
29211.77
0.000
1.962
1.962
18.733
1.962
0.000
1.962
0
40
31.401
1.52
280.52
36406.97
0.000
2.261
2.261
19.309
2.261
0.000
2.261
0 200 400 600 800 soon 1200 1400
44
29.083
1.79
280.79
43400.58
0.000
2.513
2.513
19.842
2.513
0.000
2.513
Time (minutes)
48
25.502
2.02
281.02
49777.38
0.000
2.719
2.719
20.309
2.719
0.000
2.719
52
22.144
2.22
281.22
55245.17
0.000
2.883
2.883
20.697
2.883
0.000
2.883
-Qin -Rout
56
19.228
2.39
281.39
59867.81
0.000
3.013
3.013
21.017
3.013
0.000
3.013
60
16.696
2.53
281.53
63759.39
0.000
3.118
3.118
21.280
3.118
0.000
3.118
64
14.497
2.65
281.65
67018.20
0.000
3.202
3.202
21.497
3.202
0.000
3.202
Max Stage Elev. 282.0688
68
12.588
2.74
281.74
69729.07
0.000
3.271
3.271
21.675
3.271
0.000
3.271
Stage at 24hr (1440 min) 0.08
72
10.931
2.82
281.82
71965.36
0.000
3.326
3.326
21.820
3.326
0.000
3.326
Stage at 2 days (2880 min) 0.02
76
9.491
2.89
281.89
73790.58
0.000
3.370
3.370
21.938
3.370
0.000
3.370
Stage at 3 days (4320 min) 0.01
80
8.242
2.94
281.94
75259.73
0.000
3.405
3.405
22.032
3.405
0.000
3.405
Stage at 4 days (5760 min) 0.00
84
7.156
2.98
281.98
76420.50
0.000
3.433
3.433
22.106
3.433
0.000
3.433
Stage at 5 days (7200 min) 0.00
88
6.214
3.01
282.01
77314.22
0.000
3.454
3.454
22.163
3.454
0.000
3.454
Peak Discharge 3.489892
92
5.396
3.04
282.04
77976.74
0.000
3.469
3.469
22.204
3.469
0.000
3.469
96
4.685
3.05
282.05
78439.18
0.000
3.480
3.480
22.234
3.480
0.000
3.480
100
4.068
3.06
282.06
78728.51
0.000
3.486
3.486
22.252
3.486
0.000
3.486
104
3.533
3.07
282.07
78868.18
0.000
3.490
3.490
22.260
3.490
0.000
3.490
108
3.067
3.07
282.07
78878.49
0.000
3.490
3.490
22.261
3.490
0.000
3.490
112
2.664
3.07
282.07
78777.11
0.000
3.488
3.488
22.255
3.488
0.000
3.488
116
2.313
3.06
282.06
78579.36
0.000
3.483
3.483
22.242
3.483
0.000
3.483
120
2.008
3.05
282.05
78298.52
0.000
3.476
3.476
22.225
3.476
0.000
3.476
124
1.744
3.04
282.04
77946.15
0.000
3.468
3.468
22.202
3.468
0.000
3.468
128
1.514
3.02
282.02
77532.28
0.000
3.459
3.459
22.176
3.459
0.000
3.459
132
1.315
3.00
282.00
77065.62
0.000
3.448
3.448
22.147
3.448
0.000
3.448
136
1.142
2.99
281.99
76553.72
0.000
3.436
3.436
22.114
3.436
0.000
3.436
140
0.991
2.97
281.97
76003.15
0.000
3.423
3.423
22.079
3.423
0.000
3.423
144
0.861
2.95
281.95
75419.62
0.000
3.409
3.409
22.042
3.409
0.000
3.409
148
0.747
2.93
281.93
74808.07
0.000
3.394
3.394
22.003
3.394
0.000
3.394
152
0.649
2.90
281.90
74172.82
0.000
3.379
3.379
21.963
3.379
0.000
3.379
156
0.564
2.88
281.88
73517.58
0.000
3.363
3.363
21.921
3.363
0.000
3.363
160
0.489
2.86
281.86
72845.62
0.000
3.347
3.347
21.877
3.347
0.000
3.347
164
0.425
2.83
281.83
72159.75
0.000
3.330
3.330
21.833
3.330
0.000
3.330
168
0.369
2.81
281.81
71462.42
0.000
3.313
3.313
21.788
3.313
0.000
3.313
172
0.320
2.78
281.78
70755.76
0.000
3.296
3.296
21.742
3.296
0.000
3.296
176
0.278
2.76
281.76
70041.61
0.000
3.278
3.278
21.696
3.278
0.000
3.278
180
0.242
2.73
281.73
69321.58
0.000
3.260
3.260
21.649
3.260
0.000
3.260
184
0.210
2.70
281.70
68597.07
0.000
3.242
3.242
21.601
3.242
0.000
3.242
188
0.182
2.68
281.68
67869.30
0.000
3.224
3.224
21.553
3.224
0.000
3.224
192
0.158
2.65
281.65
67139.30
0.000
3.205
3.205
21.505
3.205
0.000
3.205
196
0.137
2.63
281.63
66408.01
0.000
3.186
3.186
21.457
3.186
0.000
3.186
200
0.119
2.60
281.60
65676.22
0.000
3.168
3.168
21.408
3.168
0.000
3.168
204
0.104
2.57
281.57
64944.61
0.000
3.149
3.149
21.359
3.149
0.000
3.149
208
0.090
2.55
281.55
64213.80
0.000
3.129
3.129
21.311
3.129
0.000
3.129
212
0.078
2.52
281.52
63484.31
0.000
3.110
3.110
21.262
3.110
0.000
3.110
216
0.068
2.50
281.50
62756.59
0.000
3.091
3.091
21.213
3.091
0.000
3.091
220
0.059
2.47
281.47
62031.03
0.000
3.072
3.072
21.164
3.072
0.000
3.072
224
0.051
2.44
281.44
61307.99
0.000
3.052
3.052
21.115
3.052
0.000
3.052
228
0.044
2.42
281.42
60587.77
0.000
3.032
3.032
21.066
3.032
0.000
3.032
232
0.039
2.39
281.39
59870.62
0.000
3.013
3.013
21.017
3.013
0.000
3.013
236
0.033
2.37
281.37
59156.78
0.000
2.993
2.993
20.968
2.993
0.000
2.993
240
0.029
2.34
281.34
58446.44
0.000
2.973
2.973
20.919
2.973
0.000
2.973
244
0.025
2.31
281.31
57739.78
0.000
2.954
2.954
20.870
2.954
0.000
2.954
248
0.022
2.29
281.29
57036.95
0.000
2.934
2.934
20.822
2.934
0.000
2.934
252
0.019
2.26
281.26
56338.07
0.000
2.914
2.914
20.773
2.914
0.000
2.914
256
0.017
2.24
281.24
55643.28
0.000
2.894
2.894
20.725
2.894
0.000
2.894
260
0.014
2.21
281.21
54952.67
0.000
2.874
2.874
20.677
2.874
0.000
2,874
264
0.012
2.19
281.19
54266.32
0.000
2.854
2.854
20.629
2.854
0.000
2.854

Wntarchori R. Pnnri Innutc
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
Tp =
46.59 min
dT =
5 min
[min]
[cfs]
[ft]
ft msl
[cu ft]
[cfs]
[cfs]
[cfs]
[cfs]
[cfs]
[cfs]
[cfs]
0
0.000
0.00
279.00
0.87
0.000
0.000
0.000
15.864
0.000
0.000
0.000
5
1.430
0.03
279.03
429.77
0.000
0.008
0.008
15.933
0.008
0.000
0.008
60
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
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
30
36.485
0.89
279.89
20173.24
0.000
1.491
1.491
17.963
1.491
0.000
1.491
2 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
0
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
0.0221
2.19
281.19
54191.74
0.000
2.852
2.852
20.623
2.852
0.000
2.852
Qin vs Qout
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 R 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 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]
[cfs]
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
25.056
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
66659.26
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.
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.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.000
0.021
0.091
0.301
0.756
1.489
2.036
2.532
2.983
3.393
14.091
23.752
24.611
24.877
25.056
25.161
25.203
25.191
25.132
25.032
24.726
24.533
24.312
24.070
23.806
23.526
19.748
13.581
10.335
8.351
7.012
6.043
5.309
4.735
3.927
3.662
3.511
3.481
3.44
3.42
3.261
3.21
3.19
3.17
3.14
3.12
3.051
Qin vs Qout
70
60
so
40
3 30
0
20
10
0
0 100 200 300 400 500 600 700 800
Time (minutes)
-Qin
-QOUt
Max Stage Elev.
283.826
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
25.20329 cfs
Peak ES Discharge 0.000 cfs
900
Velocity over emergency spillway at max stage
cross -sectional area = 796.5199 cfs
velocity (V) = 0 Us
max velocity for grass lined channel is 4 ft/s

\A/atarchari R Pnnri 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 50 Year Storm:
g =
268.689
h =
26.0264
P =
6.91 in
S =
0.75 in
Q. =
6.08 in
I =
5.8 in/hr
Qp =
63.31 cfs
Tp =
52.65 min
dT =
5 min
nin]
[cfs]
[ft]
ft msl
[cu ft]
[cfs]
[cfs]
[cfs]
[cfs]
[ctsj
tctsj
0
0.000
0.00
279.00
0.87
0.000
0.000
0.000
15.864
0.000
0.000
5
1.398
0.03
279.03
420.39
0.000
0.008
0.008
15.931
0.008
0.000
10
5.470
0.05
279.05
837.45
0.000
0.021
0.021
15.989
0.021
0.000
15
11.855
0.13
279.13
2472.21
0.000
0.091
0.091
16.195
0.091
0.000
20
19.990
0.30
279.30
6001.55
0.000
0.303
0.303
16.594
0.303
0.000
25
29.156
0.55
279.55
11907.69
0.000
0.768
0.768
17.197
0.768
0.000
30
38.542
0.90
279.90
20424.03
0.000
1.506
1.506
17.986
1.506
0.000
35
47.320
1.34
280.34
31534.88
0.000
2.064
2.064
18.922
2.064
0.000
40
54.715
1.85
280.85
45111.82
0.000
2.570
2.570
19.969
2.570
0.000
45
60.072
2.42
281.42
60755.31
0.000
3.037
3.037
21.077
3.037
0.000
50
62.919
3.03
282.03
77865.89
0.000
3.466
3.466
22.197
3.466
0.000
55
63.005
3.66
282.66
95701.80
17.326
3.856
21.181
23.285
21.181
0.000
60
60.321
4.09
283.09
108248.86
41.007
4.103
45.110
24.009
24.009
0.000
65
55.104
4.46
283.46
119142.26
59.817
4.305
64.122
24.615
24.615
0.000
70
48.797
4.77
283.77
128289.11
66.269
4.466
70.735
25.108
25.108
0.000
75
43.130
5.00
284.00
135395.78
70.850
4.587
75.437
25.482
25.482
0.014
80
38.121
5.18
284.18
140685.87
74.063
4.674
78.737
25.756
25.756
4.595
85
33.693
5.26
284.26
143016.70
75.432
4.712
80.144
25.875
25.875
7.860
90
29.780
5.26
284.26
143004.00
75.424
4.712
80.136
25.875
25.875
7.841
95
26.322
5.22
284.22
141823.37
74.734
4.692
79.427
25.814
25.814
6.117
100
23.265
5.16
284.16
140140.56
73.739
4.665
78.404
25.728
25.728
3.919
105
20.563
5.10
284.10
138226.11
72.588
4.634
77.222
25.629
25.629
1.850
110
18.175
5.03
284.03
136151.36
71.319
4.599
75.918
25.521
25.521
0.297
115
16.064
4.95
283.95
133858.39
69.886
4.561
74.447
25.402
25.402
0.000
120
14.199
4.86
283.86
131057.12
68.093
4.513
72.606
25.254
25.254
0.000
125
12.550
4.75
283.75
127740.35
65.901
4.457
70.357
25.079
25.079
0.000
130
11.092
4.62
283.62
123981.65
63.318
4.391
67.709
24.877
24.877
0.000
135
9.804
4.48
283.48
119846.13
60.339
4.318
64.657
24.653
24.653
0.000
140
8.665
4.33
283.33
115391.38
57.072
4.237
61.309
24.408
24.408
0.000
145
7.659
4.17
283.17
110668.43
46.261
4.149
50.410
24.145
24.145
0.000
150
6.769
4.00
283.00
105722.46
35.740
4.055
39.795
23.866
23.866
0.000
155
5.983
3.82
282.82
100593.56
25.788
3.954
29.743
23.571
23.571
0.000
160
5.288
3.64
282.64
95317.28
16.708
3.848
20.555
23.262
20.555
0.000
165
4.674
3.48
282.48
90737.25
9.938
3.752
13.690
22.989
13.690
0.000
170
4.131
3.39
282.39
88032.64
6.515
3.694
10.209
22.826
10.209
0.000
175
3.652
3.33
282.33
86209.38
4.490
3.655
8.145
22.715
8.145
0.000
180
3.227
3.28
282.28
84861.37
3.162
3.625
6.787
22.633
6.787
0.000
185
2.853
3.24
282.24
83793.61
2.224
3.601
5.826
22.567
5.826
0.000
190
2.521
3.21
282.21
82901.73
1.530
3.581
5.111
22.512
5.111
0.000
195
2.229
3.18
282.18
82124.87
0.999
3.564
4.563
22.464
4.563
0.000
200
1.970
3.16
282.16
81424.58
0.590
3.548
4.138
22.420
4.138
0.000
205
1.741
3.14
282.14
80774.18
0.280
3.533
3.813
22.380
3.813
0.000
210
1.539
3.11
282.11
80152.50
0.067
3.519
3.586
22.341
3.586
0.000
215
1.360
3.09
282.09
79538.35
0.000
3.505
3.505
22.303
3.505
0.000
220
1.202
3.07
282.07
78894.85
0.000
3.490
3.490
22.262
3.490
0.000
225
1.063
3.05
282.05
78208.40
0.000
3.474
3.474
22.219
3.474
0.000
230
0.939
3.02
282.02
77484.84
0.000
3.458
3.458
22.173
3.458
0.000
235
0.830
2.99
281.99
76729.32
0.000
3.440
3.440
22.125
3.440
0.000
240
0.734
2.97
281.97
75946.38
0.000
3.421
3.421
22.076
3.421
0.000
245
0.648
2.94
281.94
75140.06
0.000
3.402
3.402
22.024
3.402
0.000
250
0.573
2.91
281.91
74313.91
0.000
3.383
3.383
21.972
3.383
0.000
255
0.507
2.88
281.88
73471.08
0.000
3.362
3.362
21.918
3.362
0.000
260
0.448
2.85
281.85
72614.37
0.000
3.342
3.342
21.862
3.342
0.000
265
0.396
2.82
281.82
71746.23
0.000
3.320
3.320
21.806
3.320
0.000
270
0.350
2.79
281.79
70868.84
0.000
3.299
3.299
21.749
3.299
0.000
275
0.309
2.75
281.75
69984.14
0.000
3.277
3.277
21.692
3.277
0.000
280
0.273
2.72
281.72
69093.82
0.000
3.255
3.255
21.634
3.255
0.000
285
0.242
2.69
281.69
68199.41
0.000
3.232
3.232
21.575
3.232
0.000
290
0.213
2.66
281.66
67302.22
0.000
3.209
3.209
21.516
3.209
0.000
295
0.189
2.63
281.63
66403.46
0.000
3.186
3.186
21.456
3.186
0.000
300
0.167
2.59
281.59
65504.15
0.000
3.163
3.163
21.397
3.163
0.000
305
0.147
2.56
281.56
64605.24
0.000
3.140
3.140
21.337
3.140
0.000
310
0.130
2.53
281.53
63707.55
0.000
3.116
3.116
21.277
3.116
0.000
315
0.115
2.50
281.50
62811.79
0.000
3.092
3.092
21.216
3.092
0.000
320
0.102
2.47
281.47
61918.61
0.000
3.069
3.069
21.156
3.069
0.000
325
0.090
2.43
281.43
61028.59
0.000
3.044
3.044
21.096
3.044
0.000
330
0.080
2.40
281.40
60142.24
0.000
3.020
3.020
21.035
3.020
0.000
[cfs] Qln Vs QOut
0.000
0.008 70
0.021 60
0.091 so
0.303 40
0.768 3 30
1.506 2 20
2.064
2.570 10
3.037 0
3.466 0 100 200 300 400 Soo 600 700 800 900
21.181 Time (minutes)
24.615
-Qin
-gout
25.108
25.496
30.351
Max Stage Elev.
284.2579
33.736
Stage at 24hr (1440 min)
0.10
33.716
Stage at 2 days (2880 min)
0.02
31.931
Stage at 3 days (4320 min)
0.01
29.646
Stage at 4 days (5760 min)
0.00
27.479
Stage at 5 days (7200 min)
0.00
25.818
Peak Discharge
33.73581 cfs
25.402
25.254
Peak ES Discharge
7.860 cfs
24.
24.145
23.866
23.571
20.555
13.690
10.209
8.145
6.787
5.826
5.111
4.563
4.138
3.813
3.586
3.505
3.490
3.474
3.458
3.440
3.421
3.402
3.362
3.342
3.320
3.299
3.277
3.255
3.232
3.209
3.186
3.163
3.140
3.116
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

Waf-rcharl P. Pnnrl 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 100 Year Storm:
g =
301.255
h =
27.6741
P =
7.72 in
S =
0.75 in
Q. =
6.88 in
I =
6.3 in/hr
Qp =
68.53 cfs
Tp =
55.06 min
dT =
6 min
nin]
[cfs]
[ft]
ft msl
[cu ft]
[cfs]
[cfs]
[cfs]
[cfs]
[cfs]
(ctsjl
0
0.000
0.00
279.00
0.87
0.000
0.000
0.000
15.864
0.000
0.000''.
6
1.988
0.04
279.04
716.68
0.000
0.017
0.017
15.973
0.017
0.000
12
7.723
0.08
279.08
1426.39
0.000
0.043
0.043
16.066
0.043
0.000'.
18
16.538
0.22
279.22
4191.05
0.000
0.186
0.186
16.395
0.186
0.000
24
27.410
0.48
279.48
10077.57
0.000
0.612
0.612
17.017
0.612
0.000',
30
39.078
0.88
279.88
19724.75
0.000
1.463
1.463
17.924
1.463
0.000'
36
50.188
1.41
280.41
33266.25
0.000
2.136
2.136
19.061
2.136
0.000
42
59.450
2.05
281.05
50564.79
0.000
2.743
2.743
20.366
2.743
0.000
48
65.789
2.79
281.79
70979.09
0.000
3.302
3.302
21.757
3.302
0.000
54
68.471
3.58
282.58
93474.67
13.849
3.809
17.658
23.153
17.658
0.000
60
67.182
4.21
283.21
111767.16
48.712
4.170
52.882
24.207
24.207
0.000
66
62.074
4.73
283.73
127238.29
65.562
4.448
70.010
25.052
25.052
0.000
72
54.342
5.18
284.18
140566.40
73.992
4.672
78.664
25.750
25.750
4.444
78
47.164
5.47
284.47
149259.69
78.971
4.811
83.783
26.192
26.192
19.038
84
40.935
5.49
284.49
149956.11
79.355
4.822
84.178
26.227
26.227
20.471
90
35.528
5.42
284.42
147881.24
78.205
4.790
82.994
26.122
26.122
16.303
96
30.835
5.34
284.34
145398.07
76.803
4.750
81.553
25.997
25.997
11.744
102
26.762
5.25
284.25
142912.30
75.371
4.710
80.081
25.870
25.870
7.702
108
23.228
5.17
284.17
140460.78
73.929
4.670
78.600
25.744
25.744
4.312
114
20.160
5.09
284.09
138002.57
72.453
4.630
77.083
25.617
25.617
1.643
120
17.497
5.01
284.01
135446.17
70.882
4.587
75.469
25.485
25.485
0.024
126
15.186
4.91
283.91
132561.89
69.062
4.539
73.601
25.334
25.334
0.000
132
13.180
4.79
283.79
128908.69
66.682
4.477
71.158
25.141
25.141
0.000
138
11.439
4.64
283.64
124602.89
63.752
4.402
68.155
24.911
24.911
0.000
144
9.928
4.48
283.48
119753.20
60.271
4.316
64.587
24.648
24.648
0.000
150
8.617
4.30
283.30
114454.12
54.870
4.220
59.090
24.357
24.357
0.000
156
7.479
4.10
283.10
108787.85
42.160
4.114
46.274
24.040
24.040
0.000
162
6.491
3.90
282.90
102825.95
29.993
3.999
33.991
23.700
23.700
0.000
168
5.634
3.69
282.69
96630.75
18.849
3.875
22.723
23.340
22.723
0.000
174
4.890
3.47
282.47
90478.56
9.590
3.747
13.337
22.974
13.337
0.000
180
4.244
3.37
282.37
87437.55
5.827
3.681
9.508
22.790
9.508
0.000
186
3.683
3.30
282.30
85542.24
3.814
3.640
7.454
22.674
7.454
0.000
192
3.197
3.26
282.26
84184.87
2.555
3.610
6.165
22.591
6.165
0.000
198
2.774
3.22
282.22
83116.24
1.689
3.586
5.275
22.525
5.275
0.000
204
2.408
3.19
282.19
82216.09
1.057
3.566
4.623
22.469
4.623
0.000
210
2.090
3.16
282.16
81418.60
0.586
3.548
4.134
22.420
4.134
0.000
216
1.814
3.13
282.13
80682.60
0.243
3.531
3.774
22.374
3.774
0.000
222
1.574
3.11
282.11
79976.97
0.027
3.515
3.542
22.330
3.542
0.000
228
1.366
3.08
282.08
79268.53
0.000
3.499
3.499
22.286
3.499
0.000
234
1.186
3.06
282.06
78500.83
0.000
3.481
3.481
22.237
3.481
0.000
240
1.029
3.03
282.03
77674.54
0.000
3.462
3.462
22.185
3.462
0.000
246
0.893
3.00
282.00
76798.77
0.000
3.441
3.441
22.130
3.441
0.000
252
0.775
2.96
281.96
75881.44
0.000
3.420
3.420
22.072
3.420
0.000
258
0.673
2.93
281.93
74929.41
0.000
3.397
3.397
22.011
3.397
0.000
264
0.584
2.89
281.89
73948.65
0.000
3.374
3.374
21.948
3.374
0.000
270
0.507
2.86
281.86
72944.34
0.000
3.350
3.350
21.884
3.350
0.000
276
0.440
2.82
281.82
71920.99
0.000
3.325
3.325
21.818
3.325
0.000
282
0.382
2.79
281.79
70882.50
0.000
3.299
3.299
21.750
3.299
0.000
288
0.331
2.75
281.75
69832.27
0.000
3.273
3.273
21.682
3.273
0.000
294
0.288
2.71
281.71
68773.26
0.000
3.247
3.247
21.613
3.247
0.000
300
0.250
2.67
281.67
67708.03
0.000
3.220
3.220
21.543
3.220
0.000
306
0.217
2.63
281.63
66638.82
0.000
3.192
3.192
21.472
3.192
0.000
312
0.188
2.60
281.60
65567.56
0.000
3.165
3.165
21.401
3.165
0.000
318
0.163
2.56
281.56
64495.93
0.000
3.137
3.137
21.329
3.137
0.000
324
0.142
2.52
281.52
63425.42
0.000
3.109
3.109
21.258
3.109
0.000
330
0.123
2.48
281.48
62357.28
0.000
3.080
3.080
21.186
3.080
0.000
336
0.107
2.44
281.44
61292.65
0.000
3.052
3.052
21.114
3.052
0.000
342
0.093
2.40
281.40
60232.47
0.000
3.023
3.023
21.042
3.023
0.000
348
0.080
2.37
281.37
59177.61
0.000
2.994
2.994
20.969
2.994
0.000
354
0.070
2.33
281.33
58128.78
0.000
2.965
2.965
20.897
2.965
0.000
360
0.061
2.29
281.29
57086.64
0.000
2.935
2.935
20.825
2.935
0.000
366
0.053
2.25
281.25
56051.73
0.000
2.906
2.906
20.753
2.906
0.000
372
0.046
2.22
281.22
55024.56
0.000
2.876
2.876
20.682
2.876
0.000
378
0.040
2.18
281.18
54005.55
0.000
2.846
2.846
20.610
2.846
0.000
384
0.034
2.14
281.14
52995.06
0.000
2.817
2.817
20.539
2.817
0.000
390
0.030
2.10
281.10
51993.44
0.000
2.787
2.787
20.468
2.787
0.000
396
0.0261
2.07
281.07
51000.96
0.000
2.757
2.757
20.397
2.757
0.000
[cfs]
Qin vs Qout
0.000
0.017
80
0.043
70
0.186
60
0.612
5 50
1.463
3 40
2.136
LL 0 30
2.743
20
3,302
10
17.658
0
24.207
0
zoo 400
600 800 1000 1200
25.052
Time (minutes)
30.194
45.230
-Qin
-gout
46.698
42.426
37.740
Max Stage Elev.
284.4883
33.572
Stage at 24hr (1440 min)
0.10
30.056
Stage at 2 days (2880 min)
0.02
27.261
Stage at 3 days (4320 min)
0.01
25.509
Stage at 4 days (5760 min)
0.00
25.334
Stage at 5 days (7200 min)
0.00
25.141
Peak Discharge
46.69817 cfs
24.911
24.648
Peak ES Discharge
20.471 cfs
24.357
24.040
Velocity over emergency spillway at max stage
23.700
cross -sectional area = 809.7655 cfs
22.723
velocity (V) = 0.025281 Us
13.337
max velocity for grass lined channel is 4 ft/s
7.454
6.165
5.275
4.623
4.134
3.774
3.542
3.499
3.481
3.462
3.441
3.420
3.397
3.374
3.350
3.325
3.299
3.273
3.247
3.220
3.192
3.165
3.137
3.109
3.080
3.052
2.965
2.935
2.906
2.876
2.846
2.817
2.787
2.757

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Skimmer Basin 2021-2 Runoff Calculations.xlsx
User Entry 2-year 24 hour 10-year 24 hour 25-year 24 hour 50-year 24 hour 100-year 24 hour
Calculated T Oil T Gin T Qin T Qin T Olin 1 YR, 24 hr
Time (min) Q(ds) Time (min) Q(ds) Time(min) Q(ds) Time (min) Q(ds) Time (min) Q(ds)
Watershed Informatio;fIr 0 0 0 0 0 0 0 0 0 0
A= 1.5 ac 2 0 3 0 4 0 4 0 4 0
SCS CN = -(Indust. HSG D) 4 0 6 1 8 1 8 1 8 1
H= 10 ft 6 1 9 1 12 2 12 2 12 2
L= 787 ft 8 1 12 2 16 4 16 3 16 3
C (rational C) = 0.76 10 2 15 3 20 5 20 5 20 5 c
Optional K= -From Ktab 12 3 18 5 24 6 24 6 24 6
Tc(Kirpich)= 7.122638 min 14 4 21 6 28 8 28 8 28 7
1-year, 24 hour storm 16 4 24 7 32 8 32 9 32 9
g= From i-G-F tab 18 5 27 7 36 9 36 9 36 9
h = From I-G-F tab 20 5 30 8 40 8 40 9 40 10
P= Min 22 5 33 8 44 8 44 9 44 10 Time, m�nucr.
S= 1.363636 in 24 5 36 7 48 7 48 8 48 9
Q' = 1.720742 in 26 5 39 7 52 6 52 7 52 8
1 = 4.458714 in/hr 28 4 42 6 56 5 56 6 56 7 10 YR, 24 hr
QP = 5.082934 ds 30 4 45 5 60 4 60 5 60 7
To 22.08929 min 32 3 48 5 64 4 64 5 64 6 ..
dp=0.1'Tp= 2 min(rounded) 34 3 51 4 68 3 68 4 68 5
30-year, 24 hour storm 36 3 54 4 72 3 72 4 72 5
g= From I-G-F tab 38 2 57 3 76 2 76 3 76 4
h= From I-G-F tab 40 2 60 3 Bo 2 80 3 80 4 0
P= Min 42 2 63 3 84 2 84 2 84 3
S= 1.363636 in 44 2 66 2 88 2 88 2 88 3 Q. = 3.78303 in 46 1 69 2 92 1 92 2 92 2
1 = 6.735023 in/hr 48 1 72 2 96 1 96 2 96 2
Qp= 7.677926 ds 50 1 75 2 100 1 100 1 100 2 --
Tp= 32.14965 In 52 1 78 1 104 1 104 1 104 2 nm�--. minute.
dp=0.1'Tp= 3 min (rounded) 54 1 81 1 108 1 108 1 108 1
25-year, 24 hour storm 56 1 84 1 112 1 112 1 112 1
g= From-G-Ftab 58 1 87 1 116 1 116 1 116 1 25 YR, 24 hr
h = From-G-F tab 60 1 90 1 120 0 120 1 120 1
P= Min 62 1 93 1 124 0 124 1 124 1
S= 1.363636 in 64 1 96 1 128 0 128 1 128 1
Q' = 4.731868 in 66 0 99 1 132 0 132 0 132 1
1= 7.504439 in/hr 68 0 102 1 136 0 136 0 136 1
Qp = 8.55506 ds 70 0 105 0 140 0 140 0 140 1 c
Tp= 36.09027 min 72 0 108 0 144 0 144 0 144 0
dp=0. 1'Tp= 4 min (rounded) 74 0 ill 0 148 0 148 0 148 0
50-year, 24 hour storm 76 0 114 0 152 0 152 0 152 0
g=
From I-G-F tab 78 0 117 0 156 0 156 0 156 0 �"-'-'--
h = From -G-F tab 80 0 120 0 160 0 160 0 160 0
P= m 82 0 123 0 164 0 164 0 164 0
S= 1.363636 in 84 0 126 0 168 0 168 0 168 0
Q. = 5.506048 in 86 0 129 0 172 0 172 0 172 0
1 = 8.105473 in/hr 88 0 132 0 176 0 176 0 176 0 50 YR, 24 hr
Qp = 9.240239 ds 90 0 135 0 180 0 180 0 180 0 -
Tp= 38.88099 min 92 0 138 0 184 0 184 0 184 0
dp=0.1'Tp= 4 min (rounded) 94 0 141 0 188 0 188 0 188 0 c
100-year, 24 hour storm 96 0 144 0 192 0 192 0 192 0
9- From-G-F tab 98 0 147 0 196 0 196 0 196 0
h= From -G-F tab 100 0 150 0 200 0 200 0 200 0 c
P= in 102 0 153 0 204 0 204 0 204 0
S= 1.363636 in 104 0 156 0 208 0 208 0 208 0
Q. = 6.294682 in 106 0 159 0 212 0 212 0 212 0
1= 8.65757 in/hr 108 0 162 0 216 0 216 0 216 0
Qp = 9.86963 ds 110 0 165 0 220 0 220 0 220 0
Tp= 41.61534 in 112 0 168 0 224 0 224 0 224 0
dp=0.1'Tp= 4 min (rounded) 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
�o
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 S
130 0 195 0 260 0 260 0 260 0 ..
132 0 198 0 264 0 264 0 264 0 '
134 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
140 0 210 0 280 0 280 0 280 0
142 0 213 0 284 0 284 0 284 0
144 0 216 0 288 0 288 0 298 0

Skimmer Basin 2021-2 DEMLR Worksheet.xls
Skimmer Basin
Okay
Disturbed Area (Acres)
Peak Flow from 10-year Storm (cfs)
2502 Required Volume ft3
2496 Required Surface Area ft2
35.3 Suggested Width ft
70.7 Suggested Length ft
Trial Top Width at Spillway Invert ft
Trial Top Length at Spillway Invert ft
Trial Side Slope Ratio Z:1
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
Trial Weir Length ft
Trial Depth of Flow ft
36.0 Spillway Capacity cfs Okay
-Skimmer Size (inches) rmmer r
0.125 Head on Skimmer (feet) Inches
-Orifice Size (1/4 inch increments) 1
3.06 Dewatering Time (days)
Suggest about 3 days 2

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Skimmer Basin 2021-3 Runoff Calculations. zlsz
User Entry 2-year 24 hour 10-year 24 hour 25-year 24 hour 50-year 24 hour 100-year 24 hour
Calculated T Qin T Qin T Qin T Qin T Qin
Time (min) Q(ds) Time (min) Q(cfs) Time (min) Q(ds) Time (min) Q(cfs) Time (min) Q(ds) IYR, 24 hr
�VJ,atatshed'!ti<TordtaiPtlp"- 0 0 0 0 0 0 0 0 0 0 -r
A= 4.17 ac 2 0 3 1 3 1 4 1 4 1
SCS CN= _(Indust. HSG D) 4 1 6 2 6 2 8 4 8 4
H= 26 ft 6 3 9 5 9 5 12 8 12 8
L= 800 ft 8 5 12 9 12 8 16 13 16 13
C (rational C) = 0.86 10 7 15 13 15 12 20 19 20 18 0
Optional K = - From K tab 12 10 18 17 18 16 24 24 24 23
Tc(Kirpich)= 5.024516 min 14 12 21 21 21 20 28 28 28 28
1-year, 24 hour storm 16 14 24 23 24 24 32 30 32 31
9- From I-G-F tab 18 16 27 25 27 26 36 31 36 33
h = From-G-F tab 20 17 30 26 30 28 40 30 40 33
P= Min 22 17 33 25 33 29 44 27 44 31
S= 0.752688 in 24 17 36 24 36 28 48 23 48 28
Q'= 2,149006 in 26 16 39 21 39 27 52 20 52 24
1 = 4.864817 in/hr 28 15 42 18 42 24 56 17 56 21 10 YR, 24 hr
Qp = 17.44621 ds 30 13 45 16 45 22 60 15 60 18
Tp= 22.34406 in 32 12 48 14 48 19 64 13 64 16
dp=0.1'Tp= 2 min (rounded) 34 10 51 12 51 17 68 11 68 14
10-year, 24 hour storm 36 9 54 11 54 15 72 10 72 12
g= From 1-G-Ftab 38 8 57 10 57 14 76 8 76 11
h = From-G-F tab 40 7 60 8 60 12 80 7 80 9 c
P= in 42 7 63 7 63 11 84 6 84 8
S= 0.752688 in 44 6 66 7 66 9 88 5 88 7
Q. = 4.315782 in 46 5 69 6 69 8 92 5 92 6
I= 7,25347 in/hr 48 5 72 5 72 8 96 4 96 5
Qp= 26.01239 ds 5o 4 75 4 75 7 100 3 100 5
Tp = 30.09571 min 52 4 78 4 78 6 104 3 104 4 1. °f ... �
dip =0.1'Tp= 3 min (rounded) 54 3 81 3 81 5 108 3 108 3
25-year, 24 hour storm 56 3 84 3 84 5 112 2 112 3
8= From-G-F tab 58 3 87 3 87 4 116 2 116 3 25 YR, 24 hr
h = From-G-f tab 60 2 90 2 90 4 120 2 120 2
P= Min 62 2 93 2 93 3 124 1 124 2
S= 0.752688 in 64 2 96 2 96 3 128 1 128 2
Q. 5.291179 in 66 2 99 2 99 3 132 1 132 2
1= 8.043247 in/hr 68 1 102 1 102 2 136 1 136 1
Qp= 28.84469 ds 70 1 105 1 105 2 140 1 140 1 -
Tp= 33.27453 in 72 1 108 1 108 2 144 1 144 1
dp=0.1'Tp= 3 min (rounded) 74 1 111 1 Ill 2 148 1 148 1
50-year, 24 hour storm 76 1 114 1 114 1 152 1 152 1
8= From I-G-I tab 78 1 117 1 117 1 156 0 156 1
h = Fro
m-G-F tab 8o 1 120 1 120 1 160 0 160 1
P= Mir, 82 1 123 1 123 1 164 0 164 1
S= 0.752688 in 84 1 126 0 126 1 168 0 168 0
Q' = 6.082191 in 86 1 129 0 129 1 172 0 172 0
1 = 8.653163 in/hr 88 0 132 0 132 1 176 0 176 0 50 YR, 24 hr
On 31.03197 ds 90 0 135 0 135 1 180 0 180 0
Tp= 35.55298 min 92 0 138 0 138 1 184 0 184 0
cip=0.1'Tp= 4 min (rounded) 94 0 141 0 141 1 188 0 188 0
100-year, 24 hour storm 96 0 144 0 144 0 192 0 192 0
8= M From I-G-F tab 98 0 147 0 147 0 196 0 196 0
h= From I-G-F tab 100 0 150 0 150 0 200 0 200 0 c
P= m 302 0 153 0 153 0 204 0 204 0
S= 0.752688 in 104 0 156 0 156 0 208 0 208 0
Q. = 6.89485 in 106 0 159 0 159 0 212 0 212 0
1= 9.213087 in/hr 108 0 162 0 162 0 216 0 216 0
Qp = 33.03997 ds 110 0 165 0 165 0 220 0 220 0 -
Tp = 37.79898 min 112 0 168 0 168 0 224 0 224 0
dip =0.1'Tp= 4 min (rounded) 114 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 0 180 0 240 0 240 0 -
122 0 183 0 193 0 244 0 244 0
124 0 186 0 196 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 0 195 0 260 0 260 0 0
132 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
138 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
144 0 216 0 216 0 288 0 288 0

Skimmer Basin 2021-3 DEMLR Worksheet.xls
Skimmer Basin
Okay
Disturbed Area (Acres)
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
Trial Top Width at Spillway Invert ft
Trial Top Length at Spillway Invert ft
Trial Side Slope Ratio Z:1
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
Trial Weir Length ft
Trial Depth of Flow ft
54.0 Spillway Capacity cfs Okay
-Skimmer Size (inches) Skimmer i
0.167 Head on Skimmer (feet) Inches
1
-Orifice Size (1/4 inch increments)
3.53 Dewatering Time (days)
Suggest about 3 days 2.