SW6220101_Design Calculations_20220614 (10)

DESIGN REQUIREMENTS:
A. Pass the storm event
Drainage Area, (DA) = 19.40 acres
Intensity, (I) = 3.80 inches/hr
Composite Runoff Coefficient, (C) _> 0.31
Maximum Release Rate, (Q10) _> 22.85 cfs
Drainage Area, (DA) = 19.40 acres
Intensity, (I) = 7.76 inches/hr
Composite Runoff Coefficient, (C) _> 0.60
Peak Release Rate, (Q10) _> 90.33 cfs
Contour
Contour
Incr.
Accum.
Stage
Elev.
Area
Storage
Storage (S)
(Z)
00
(sfl
(cfl
(cfl
00
In (S)
In (Z)
Z est
279.5
12,437
-
-
-
280.0
14,355
6,698
6,698
0.50
8.81
-0.69
0.56
280.5
15,345
7,425
14,123
1.00
9.56
0.00
1.05
281.0
16,353
7,925
22,048
1.50
€ 10.00 €
0.41
1.51
281.5
17,381
8,434
30,481
2.00
€ 10.32 €
0.69
1.98
282.0
18,426
8,952
39,433
2.50
10.58
0.92
2.45
282.5
19,489
9,479
48,912
3.00
€ 10.80 €
1.10
2.92
283.0
20,570
10,015
58,926
3.50
10.98
1.25
3.41
283.5
21,669
10,560
69,486
4.00
11.15
1.39
3.91
284.0
22,785
11,114
80,600
4.50
€ 11.30 €
1.50
4.42
284.5
23,917
11,676
92,275
5.00
11.43
1.61
4.95
285.0
25,065
12,246
104,521
5.50
11.56
1.70
5.48
285.5
26,229
12,824
117,344
6.00
€ 11.67 €
1.79
6.04
286.0
27,408
13,409
130,753
6.50
11.78
1.87
6.60
286.5
28,603
14,003
144,756
7.00
11.88
1.95
7.18
287.0
29,813
14,604
159,360
7.50
11.98
2.01
7.78
Regression Output:
b= 1.21 (X Variable Coeff)
Ks- 13,377 (eY-'ri`e"pt)
Stage - Storage Equation is of the form: S = (Ks)(Z)b
printed: 6/14/2022 2:23 PM Page 1 of 3

Barrel
Number of Barrels =
Dia. of Barrel =
Area of Barrel, (Ab) _
Pipe Length, (L) _
Friction Coeff, (Kp) _
Inv. of Barrel =
Riser
Elev. of Riser Crest
Rectangular
Length Weir— 36 inches
Total Weir Length=
Area of Riser =
Orifice in Riser
Dia. of Orifice =
Number of Orifices =
Area of Orifice, (Ab) _
Orifice Coefficient (Cd) _
Inv. of Orifice =
Length of weir —
Top of weir —
Weir Coefficient (Cw)—
Width of Spillway (Approx.) _
Weir Coefficient =
Crest Elevation =
Maximum Release Rate, (Q10) _
Release Rate, (Q10) _
Normal Water Surface Elev. _
1
36 inches
7.07 sf
50 feet
0.00616
271.00 feet
285.00 feet
Width Weir— 48 inches
14.00 feet
12.00 sq. ft.
2.50 inches
1
0.03 sf
0.60
279.50 feet
3.00 feet
283.60 feet
3.00
25 feet
3.3
286.00 feet
22.85 cfs
70.90 cfs
279.50 feet
Water Surface Elev. @ Outlet (Qlo) = 285.90 feet
printed: 6/14/2022 2:23 PM
Page 2 of 3

Peak Inflow, (Qp) =>
Time to Peak Calculation: CN=
Q*=
vo1=
Time to Peak, (Tp) _>
(SCS TR-55)
90.33 cfs
83 P= 5.48 in.
3.61 in. (depth of runoff)
254,328 cf (vol. of runoff)
33.8 minutes
S= 2.05 in.
printed: 6/14/2022 2:23 PM
Page 3 of 3