PERMFILE66875

• Permit No: C1981016
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Sedimentation Control & Diversion Structure Calculations
• Section_Exhibit Name: APPENDIX XXI to Section XXI.8
• Media Type: D
• Archive: No

Design from Drawin s
• 1. Pond volume
2
•
3
Summa
1
0.54 acre ft a Principal Spillway
0.89 acre ft at Emergency Spillway
Peak flow capacity of Emergency Spillway
Q=A?n5R3S~ 2.5
In(1 25ft)2 1.5 2.45ft ~ (.183)
Q = - .2 (0.017}(3.93 ft )
z
_ (1.25ft~ l.5 „2.454ft 0.183}~
Q ~ 2 - ~ ~0.01~~3.93 ft ~ (
z
Q = (2.454ft )(88.235)( .73 )(0.428)
Q = 67.Gcfs
1 5 '-~
Q=A-~ R S
I
2' ~ 1 .4'
''~
Q = (2ft x1.4ft) (0.017 )(4.Sft ) (0.01)Z
Q = (2.8ftz)(88.235)(0.698)(0.1)
Q = 17.2 cfs
Freeboard
2/3
(Q)2/3 8.9ft = 1.3 ft
N (3L) _( 3)(2ft) )
Pond Volume
Needs 0.30 acre ft for water
. Needs 0.19 acre ft = 0.035 acre ft/acre x 5.49 acre
Needs 0.49 acre ft of total volume
Designed for 0.54 acre ft to Principal Spillway