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MAXWELL MINE <br /> SEDIMENTATION POND 003 <br /> SUMMARY OF CALCULATIONS <br /> CONTRIBUTING AREAS : <br /> RUNOFF STORM INTENSITY <br /> AREA ACRES IOYR-24HR lOYR-PEAK ( IPH) <br /> 003-1 3.3 0 .52 2.84 <br /> 003-2 2.2 0. 17 4. 10 <br /> 003-3 10.3 1 .63 2.48 <br /> 003-4 6.6 1 .00 4.79 <br /> 003-5 2.4 0.38 2.42 <br /> TOTAL 24 .8 Ac 3.70 Ac-FT <br /> SEDIMENT DETENTION: <br /> 60% SEDIMENT LOAD: 0.06 AC-FT PER ACRE REQUIRES 1 .49 Ac-FT <br /> 100% SEDIMENT LOAD: 0 . 10 Ac-FT PER ACRE REQUIRES 2.48 Ac-FT <br /> VOLUME SURFACE <br /> STORAGE Ac-FT ACRES ELEVATION <br /> BOTTOM POND - 1 . 47 7 , 109.5' <br /> 60% SEDIMENT 1 .49 1 .53 7, 110.5 ' <br /> 100% SEDIMENT 0.99 1 .57 7, 111 . 1 ' <br /> RUNOFF 3.70 1 .71 7, 113.4 ' <br /> DIRECT RAIN 0.43 1 .73 7, 113.7 ' <br /> To SPILLWAY 2.37 1 .81 7, 115.0 ' <br /> Top OF POND - - 7, 117 .0' <br /> TOTAL 8 .98 <br /> EMERGENCY SPILLWAY : <br /> AT A STORM INTENSITY GREATER THAN A 25-YR-24-Hp <br /> EVENT, THE FLOW IN THE SPILLWAY SHALL NOT EXCEED A <br /> DEPTH OF 0.99 FT ALLOWING 1 .01 FT FREEBOARD. <br /> 11 <br />