SW6201201_1641 POND 1 ROUTING (10yr storm)_20201210

DESIGN REQUIREMENTS:
A. Pass the 10 year storm event
Drainage Area, (DA) = 10.61 acres
Intensity, (I) = 7.81 inches/hr
Composite Runoff Coefficient, (C) _> 0.36
Maximum Release Rate, (Q10) _> 29.83 cfs
Drainage Area, (DA) = 10.61 acres
Intensity, (I) = 7.81 inches/hr
Composite Runoff Coefficient, (C) _> 0.79
Peak Release Rate, (Q10) _> 65.46 cfs
Contour
Contour
Incr.
Accum.
Stage
Elev.
Area
Storage
Storage (S)
(Z)
00
(sf)
(cf)
(cf)
00
In (S)
In (Z)
Z est
368.5
-
-
-
368.5
16,619
8
8
0.00
2.12
-6.91
0.00
369.0
18,182
8,700
8,709
0.50
........................
9.07
...........................
0.69
0.52
369.5
18,984
9,292
18,000
1.00
€ 9.80
0.00
1.00
370.0
19,801
9,696
27,696
1.50
€ 10.23
0.41
1.48
370.5
20,632
10,108
37,805
2.00
10.54
0.69
1.96
371.0
21,477
10,527
48,332
2.50
€ 10.79 €
0.92
2.44
371.5
22,337
10,954
59,285
3.00
10.99
1.10
2.94
372.0
23,210
11,387
70,672
3.50
11.17
1.25
3.44
372.5
24,097
11,827
82,499
4.00
€ 11.32 €
1.39
3.95
373.0
24,999
12,274
94,773
4.50
11.46
1.50
4.48
373.5
25,914
12,728
107,501
5.00
11.59
1.61
5.02
374.0
26,843
13,189
120,690
5.50
€ 11.70 €
1.70
5.57
374.5
27,788
13,658
134,348
6.00
11.81
1.79
6.13
375.0
28,746
14,134
148,482
6.50
11.91
1.87
6.71
Regression Output:
printed: 12/10/2020 3:46 PM Page 1 of 3

b= 1.11
Ks- 17,912
is of the form: S = (
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
Rectanfig filar
Length Weir —
Total Weir Length=
Area of 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)—
48 inches
Width of Spillway (Approx.) _
Weir Coefficient =
Crest Elevation =
Maximum Release Rate, (Q10) _
Release Rate, (Q10) _
Normal Water Surface Elev. _
(X Variable Coeff)
(eY-intercept)
1
30 inches
4.91 sf
76.2 feet
0.00786
368.50 feet
373.50 feet
Width Weir— 48 inches
16.00 feet
16.00 sq. ft.
3.25 inches
1
0.06 sf
0.60
368.50 feet
2.50 feet
370.63 feet
3.00
30 feet
3.3
374.00 feet
29.83 cfs
29.53 cfs
368.50 feet
printed: 12/10/2020 3:46 PM
Page 2 of 3

Water Surface Elev. @ Outlet (Q10) _
Peak Inflow, (Qp) _>
Time to Peak Calculation: CN=
Q*=
vo1=
Time to Peak, (Tp) _>
(SCS TR-55)
373.09 feet
65.46 cfs
91 P= 5.39 in.
4.36 in. (depth of runoff)
167,977 cf (vol. of runoff)
30.8 minutes
S= 0.99 in.
printed: 12/10/2020 3:46 PM
Page 3 of 3