1981-11-13_PERMIT FILE - C1981013 ‎(48)‎

• Permit No: C1981013
• IBM Index Class Name: PERMIT FILE
• Doc Date: 11/13/1981
• Doc Name: Surface Water Control Design Data
• Section_Exhibit Name: Volume 2 Exhibit 16
• Media Type: D
• Archive: No

MAXWELL MINE
SEDIMENTATION POND 004
SUMMARY OF CALCULATIONS
CONTRIBUTING AREAS:
RUNOFF STORM INTENSITY
AREA ACRES IOYR-24HR lOYR-PEAK (IPH)
004-1 9.9 0 .79 3.80
004-2 3.4 0.27 3.94
004-3 1 . 1 0. 17 2.80
TOTAL 14 .4 Ac 1 .23 Ac-FT
SEDIMENT DETENTION:
60% SEDIMENT LOAD: 0.06 Ac-FT PER ACRE REQUIRES 0.86 Ac-FT
100% SEDIMENT LOAD: 0. 10 Ac-FT PER ACRE REQUIRES 1 .44 Ac-FT
VOLUME SURFACE
STORAGE Ac-FT ACRES ELEVATION
BOTTOM POND - 0 .53 7 ,067 .5'
60% SEDIMENT 0.86 0.59 7,069.0'
100% SEDIMENT 0 .58 0.63 7 ,070.0'
RUNOFF 1 .23 0.71 7,071 .8 '
DIRECT RAIN 0 . 18 0.73 7,072. 1 '
To SPILLWAY 1 .08 0.78 7,073.5 '
TOP OF POND - 0.86 7,075.5 '
TOTAL 3.93
EMERGENCY SPILLWAY:
AT A STORM INTENSITY GREATER THAN A 25-YR-24-HR
EVENT, THE FLO14 IN THE SPTLLWAY SHALL NOT EXCEED A
DEPTH OF 0.59 FT. ALLOWING 1 .41 FT FREEBOARD.
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