CC - Storm Drain Calcs ,
Stormi
Poiema Subdivision
Meridian, I
Si4 AC
v OF t0� _
March 9, 2021
Civil Innovations, PLLC
1043 E. Park Blvd. Ste. 101
Boise, ID 83712
Phone; (208)884-8181
www.civil-innovations.com
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Poiema Subd.
Pipe Sizing Calculations
DI#1A to DI#113
Q(25)= 0.73 CFS
Slope= 0.0034
Diameter= 12 inch
Mannings "n" = 0.012
A= 0.79 sgft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 2.26 CFS OK
DI#113 to SDMH #1
Q(25)= 0.95 CFS
Slope= 0.0033
Diameter= 12 inch
Mannings"n" = 0.012
A= 0.79 sgft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 2.22 CFS OK
Poiema Subd.
Pipe Sizing Calculations
SDMH #1 to ES#1A(FOREBAY)
Q(25)= 0.95 CFS
Slope= 0.003
Diameter= 12 inch
Mannings "n" = 0.012
A= 0.79 sgft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 2.12 CFS OK
SDMH #1 to ES#113(PRIMARY POND)
Q(25)= 0.95 CFS
Slope= 0.0637
Diameter= 12 inch
Mannings "n" = 0.012
A= 0.79 sgft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 9.76 CFS OK
Poiema Subd.
Pipe Sizing Calculations
DI#2A to DI#2B
Q(25)= 1.53 CFS
Slope= 0.0031
Diameter= 12 inch
Mannings "n" = 0.012
A= 0.79 sgft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 2.15 CFS OK
DI#213 to SDMH #2
Q(25)= 2.74 CFS
Slope= 0.0103
Diameter= 12 inch
Mannings "n" = 0.012
A= 0.79 sgft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 3.93 CFS OK
Poiema Subd.
Pipe Sizing Calculations
SDMH#2 to ES#2A(FOREBAY)
Q(25)= 2.74 CFS
Slope= 0.0103
Diameter= 12 inch
Mannings "n"= 0.012
A= 0.79 sqft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 3.93 CFS OK
SDMH #2 to ES#213(PRIMARY POND)
Q(25)= 2.74 CFS
Slope= 0.0414
Diameter= 12 inch
Mannings "n" = 0.012
A= 0.79 sqft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 7.87 CFS OK
Poiema Subd.
Pipe Sizing Calculations
DI#3 to SDMH#3
Q(25)= 0.96 CFS
Slope= 0.005
Diameter= 12 inch
Mannings "n" = 0.012
A= 0.79 sgft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 2.74 CFS OK
SDMH #3 to ES#3A(FOREBAY)
Q(25) = 0.96 CFS
Slope= 0.007
Diameter= 12 inch
Mannings "n"= 0.012
A= 0.79 sgft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 3.24 CFS OK
SDMH #3 to ES#313(PRIMARY POND)
Q(25)= 0.96 CFS
Slope= 0.0682
Diameter= 12 inch
Mannings "n"= 0.012
A= 0.79 sgft
P= 3.14 ft
R= 0.25
Full Flow Capacity= 10.10 CFS OK
Storm Drain Pond#1 (Forebay Side)
10% of V(100) DI#1A= 171.1 CF
10%of V(100) DI#113= 52.6 CF
Total inflow volume= 223.7 CF
Pond Elevation Area Ave.Area Volume
(SF) (SF) (CF)
2704.0 52 0
78
2704.5 103 39
137
2705.0 171 107
213
2705.5 254 214
304
2706.0 354 366
Storage Volume=223.7 CF
HW=2705.53
Storm Drain Pond#1 (Primary Side)
90%of V(100) DI#1A= 1539.9 CF 10%of V(100) DI#1= 171.1 CF
90%of V(100) DI#213= 473.4 CF 10%of V(100) DI#2 = 52.6 CF
90%of V(100) volume= 2013.3 CF 10%of V(100)Volume= 223.7 CF
Pond Elevation Area Ave.Area Volume
(SF) (SF) (CF)
2703.5 337.5 0
450
2704.0 563 225
684
2704.5 804 567
933
2705.0 1062 1033
1199
2705.5 1336 1633
1481
2706.0 1625 2373
Storage Volume=2013.3 CF
HW=2705.76
Time to Drain
Infiltration Rate= 1.50 In/Hr
Infiltration Area= 337.5 5F
Infiltration Volume= 42.2 CF/Hr
90%of V(100)= 2013.3 CF
Time To Drain= 47.72 Hr
Storm Drain Pond#2 (Forebay Side)
10% of V(100) DI#2A= 404.4 CF
10%of V(100) DI#2B= 226.8 CF
Total inflow volume= 631.2 CF
Pond Elevation Area Ave.Area Volume
(SF) (SF) (CF)
2705.5 75 0
109
2706.0 143 55
185
2706.5 227 147
277
2707.0 327 286
385
2707.5 443 478
509
2708.0 575 733
Storage Volume=631.2 CF
HW=2707.80
Storm Drain Pond#2 (Primary Side)
90%of V(100) DI#2A= 3639.6 CF 10%of V(100) DI#2A= 404.4 CF
90%of V(100) DI#2B= 2041.2 CF 10%of V(100) DI#213= 226.8 CF
90%of V(10O) volume= 5680.8 CF 10%of V(100)Volume= 631.2 CF
Pond Elevation Area Ave.Area Volume
(SF) (SF) (CF)
2705.0 1230 0
1341
2705.5 1451 670
1569
2706.0 1687 1455
1813
2706.5 1939 2361
2073
2707.0 2206 3398
2347
2707.5 2488 4571
2637
2708.0 2785 5889
Storage Volume=5680.8 CF
HW=2707.92
Time to Drain
Infiltration Rate= 1.50 In/Hr
Infiltration Area= 1230 SF
Infiltration Volume= 154 CF/Hr
90%of V(100) = 5681 CF
Time To Drain= 36.95 Hr
Storm Drain Pond#3 (Forebay Side)
10%of V(100) DI#1= 219.2 CF
Total inflow volume= 219.2 CF
Pond Elevation Area Ave.Area Volume
(SF) (SF) (CF)
2706.5 58 0
88
2707.0 117 44
156
2707.5 195 122
244
2708.0 293 244
351
2708.5 408 419
Storage Volume=219.2 CF
H W=2707.90
Storm Drain Pond#1 (Primary Side)
90% of V(100) DI#1= 1972.8 CF 10%of V(100) DI#1= 219.2 CF
90%of V(100) volume= 1972.8 CF 10%of V(100)Volume= 219.2 CF
Pond Elevation Area Ave.Area Volume
(SF) (SF) (CF)
2706.0 498 0
573
2706.5 647 286
729
2707.0 811 651
901
2707.5 991 1101
1089
2708.0 1186 1646
1291
2708.5 1396 2291
Storage Volume=1972.8 CF
HW=2708.25
Time to Drain
Infiltration Rate= 1.5 In/Hr
Infiltration Area = 498 SF
Infiltration Volume= 62 CF/Hr
90% of V(100) = 1973 CF
Time To Drain = 31.69 Hr
Drainage Swale 1
Total inflow volume V(100) = 297.0 CF
V(100)-1 hr infiltration= 289.3 CF
Pond Elevation Area Ave.Area Volume
(SF) (5F) (CF)
2702.14 0 0
120
2702.5 239 43
434
2703.0 629 260
897
2703.5 1165 709
1506
2704.0 1846 1461
1915
2704.09 1984 2419
Storage Volume=289.3 CF
HW=2703.03 Lowest top of bank=2704.09
Time to Drain
Infiltration Rate= 1.50 In/Hr
Infiltration Area= 61.6 SF
(30.81 x 2.0'W
(continuous sand trench)
Infiltration Volume= 7.7 CF/Hr
V(100)= 297.0 CF
Time To Drain = 38.57 Hr
Drainage Swale 2
Total inflow volume V(100)= 2461.0 CF
V(100)-1 hr infiltration= 2334.5 CF
contour Elevation Area Ave.Area Volume
(SF) (SF) (CF)
2702.37 0 0
75
2702.5 149 10
537
2703.0 925 278
1602
2703.5 2278 1079
3243
2704.0 4207 2700
4482
2704.12 4756 4941
Storage Volume=2334.5 CF
HW=2703.89 Lowest top of bank=2704.12
Time to Drain
Infiltration Rate= 1.50 In/Hr
Infiltration Area = 1012.0 SF
(5061 x 2.0'W
(continuous sand trench)
Infiltration Volume= 126.5 CF/Hr
V(100)= 2461.0 CF
Time To Drain= 19.45 Hr
Drainage Swale 3
Total inflow volume V(100) = 1045.0 CF
V(100)-1 hr infiltration= 1006.4 CF
Pond Elevation Area Ave.Area Volume
(SF) (SF) (CF)
2703.78 0 0
65
2704.0 130 14
356
2704.5 581 192
734
2705.0 887 559
1073
2705.5 1258 1095
1303
2705.61 1348 1747
Storage Volume=1006.4 CF
HW=2705.42 Lowest top of bank=2705.61
Time to Drain
Infiltration Rate= 1.50 In/Hr
Infiltration Area = 309.0 SF
(sand window)
Infiltration Volume= 38.6 CF/Hr
V(100) = 1045.0 CF
Time To Drain= 27.06 Hr
DRAINAGE DRAINAGE DRAINAGE
\ AREA NO.SW1 AREA NO.SW2 AREA NO.SW3
\ 6,873 S.F./0.16 ACRE 59,787 S.F./1.37 ACRE 20,550 S.F./0.47 ACRE v
'\ 2,941 S.F.IMPERVIOUS 23,475 S.F.IMPERVIOUS 8,603 S.F.IMPERVIOUS
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\\ \\\\ \\ T \ 7,459 S.F.10.17 ACRE 10 AREA NO.1A
'� (6,825 S.F.IMPERVIOUS) I _ 42,911 S.F./ SS\ONAL
\ \\ \\ \.�o�B•r \ I a 11 0.99 ACRE Bo��vGn1s{m{r 62�E+,�p1E,
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DRAINAGE ✓97TIN P.'1��
\ \\ \ \ \ AREA NO.2B j a DRAINAGE AREA LEGEND
39,513 S.F./0.91 ACRE IN 2A DRAINAGE AREA IDENTIFICATION NO.
\ \ \\ \ \ \ 26,900 S.F.IMPERVIOUS I I + 15 D.oD AC DRAINAGE AREA(ACRES) LL V\ \ $.
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DRAINAGE AREA NO.3 \ 2s 101,763 S.F./
52,917 S.F./1.21 ACRE,\\ +0 ,\ 1 }w} 2.34ACRE
6,023 S.F.IMPERVIOUS\ \ sB ` - 2T
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'\ ♦ PROJECT NO. 20.1029-PS
\ 1 DWG FILE C.800
_-___- _\ _ ]�,� \ DESIGNED BY BT
\ \
DRAWN BY JiA
CHECKED By BT
ISSUE DATE 03/09R1
\ HOR17 SCALE AS SHOWN
VERT.SCALE AS SHOWN
800■
SHEET OF 1
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