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PERMFILE66875
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PERMFILE66875
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Last modified
8/24/2016 11:12:36 PM
Creation date
11/20/2007 9:35:16 PM
Metadata
Fields
Template:
DRMS Permit Index
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
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6eah <br />• 25yr -- 24 hr = 0.93 inches <br />5. Determine peak discharge of runoff for CPJ90 (pp 18 -FIG. S-lA, SCS) <br />25 yr -- 24 hr = 9.5 cfs/inch of runoff <br />< 0.93 inch <br />= 8.8 cfs <br />Pond Design from Drawi <br />1. Pond volume <br />Principal spillway 0.65 acre ft <br />Emergency spillway 0.79 acre ft <br />2. Peak flow of Emergency Spillway <br />• 1 5 ~~ '2 4 ft 2 ft <br />Q= A ~ R~ S <br />Q = (oft * 2ft)(0.017)(4+2+2ftft)33 (0.02)2 <br />Q = (BftZ)(88.235)(1)(0.141) <br />Q = 99.5 cfs <br />Summary <br />1. Pond volume <br />lJater = 0.28 acre ft <br />Sediment = 0.15 acre ft = 0.035 acft/acre * 4.22 acre <br />Total vnli~me Headed = 0.43 acre ft <br />Designed for 0.65 acre ft <br />• 2. Peak flow in emergency spillway. <br />Peak discharge capacity needed = 8.8 cfs <br />Designed for = 99.5 cfs <br />
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