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1 Subject STORM RUNOFF CALCULATIONS: <br />Hubbard Canvon Ventilation Facilities_ <br />No. 2 - Somerset Coal Mine <br />Sedimentation Pond No. 2 <br />P = 2.2" (25-24) Q- P+0.85 <br />Julv 14 19 81 <br />Sheet Nu. 1 of 2 Sheets <br />Map Scale 1" = 100' <br />~ TABLE 1 Area- Acre Conversion and Weiyhted Curve Numbers <br />i Fraction of Weighted Runoff <br />f Area CN Sq. In. Acres Total Acres CN I Calculation Data <br />- -- --------- ar~lc-II <br />~ ~ ; cr% 82 <br />s= 2.20 <br />Reclaimed I i Q(10.24)= 0.582" <br />Fan Pad 8P 11.08 2.54 1.00 82 I Q(25_?q)= 0.782" <br />I AMC-I <br />CrJ= 66 <br />I ~ S= 5.15 <br />I I Q(10_24)= 0.126" <br />i <br />. I ~ ~Q(2=,~?4)= 0.216„ <br />~aBLE 2 <br />I 11.08 2.54 - --:..- <br />Weighted Quantity of Runoff <br />82 C~.20 I 0:582 10.582 <br />0.782 i 0.782 <br />66 !5.151 0.125 <br />0.125 10.216 f 0.216 <br />i <br />) I I ~ 0.582 ~ 0.782 I) I 10.125 II I 0.216 <br />• <br />STORM RUNOFF COMPUTATIONS: <br />Use argest Q. Value from Tables 1 & 2) <br />Quantity, inches runoff = <br />Volume, Acre-feet = <br />Cubic-feet = <br />CALCULATION NUfES <br />By BAF <br />Checked <br />AC~'t <br />_-- <br />AMC-II i <br />AMC-1 <br />10-24 25-24 10-24 25-24 <br />0.582 0.782 0.125 0.216 <br />0.123 0.166 0.026 0.046 <br />5358 7231 1133 2004 <br />5358 Cu. Ft + 1173 Cu. Ft (3 yr) = 8877 Cu. Ft. <br /> Pond Capac ity = 9256 Cu. Ft. <br />