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

6eah
L
WEST MINE DIVERSION
Flow Calculation
1. Determine drainage area
A = 12.56 acres for lJ
A = 40.53 acres for P'.
A = 7.89 acres for E
2. Determine curve number.
CN = 89
3. Determine precipitation.
l0yr -- 24hr = 1.6 in
L_J
4. Determine volume of runoff.
l0yr -- 24hr = 0.7I in
5. Determine peak flow.
For W
10 yr -- 24hr = 21.5 cfs/in of runoff
< 0.71 inches
= 15.3 cfs
For P
l0yr -- 24hr = 52 cfs/in => 36.9 cfs <- 0.71 inches
For E
l0yr -- 24hr = 15cfs/in => 10.65 cfs < 0.71 inches
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