PERMFILE51164

• Permit No: C1981012
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 19 ALLEN MINE HYDROLOGIC BALANCE OF SURFACE RUNOFF
• Media Type: D
• Archive: No

Allen Mine
Sedimentation Pond 005
Summary of Calculations
Contributing Areas:
Runoff Storm Intensity
Area 'Acres 10Yr-24Hr 10Yr-Peak (IPH)
005-1 3.1 0.47 2.84
Sediment Detention:
60~ Sediment load: 0.06 Ac-Ft per acre requires O.tg Ac-Ft
1009 sediment load: 0.10 Ac-Ft per acre requires 0.31 Ac-Ft
Volume Surface
•
Storage Ac-Ft Acres Elevation
t
Bottom Pond - 0.07 7,450.0'
60~ Sediment 0.19. 0.12 7,452.0'
100% Sediment 0.12 0.14 7,453.0'
Runoff 0.47 0.21 7,456.0'
To Spillway 0.22 0.23 7,457.0'
Top of Pond - - 7,459.0'
TOTAL 1.00
Emergency Spillway:
The. spillway will pass a 25-Year, 24-hour storm
event. A one-foot freeboard will be maintained.
1 1 ~-~ ~
.~ _ _.