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CULVERT ADEQUACY <br />L Subject <br />"~rbbard Canyon Ventilation Facilities <br />2 - Somerset Coai Mine _ <br />~ ~rth±ide of Fan Pad <br />CALCULATION NOTES <br />By BAF <br />Checked <br />Acct ' <br />July 2 i9 81 <br />Sheet No. 1 of 1 Sheets <br /> Table 1, Area- acre GonverS~11A anc Weighted uurve Numbers AMC-fI <br />~ Sq. In. ~ Fr•actiun Weighted kunoff <br /> Area CN 1"= Acres I T~~tal Ages , CN ~ Calculation Ddta <br />-= -y <br />----- - - <br />- <br />` <br /> ~ <br />I I <br />I <br />~ CN= 67 <br /> ( 109E 51 0.01 0.92 i 0.050 ~~ 2.6 S= 4.92 <br /> <br />I <br />Absarokee <br /> <br />P 2 2 (25 24) <br />- <br /> IOIF 67 0.17 15.61 ~ 0.850 ~ 57.0 Q- (P-U.2S)2 <br /> 8eenom i , , P+ 0.85 <br /> R-1 70 0.02 1.84 0.100 ~ 7.0 . ~ <br /> Rock Outcrop ! ~ <br />~ ~ ~ <br />s~ <br />Total 0.20 -! 18.37 _ _ 1 .-000 66.8 Q= 0.241 i n . <br />Table 2, Weighted Runoff Quantity <br />_ <br />--AMC-II ----------~ <br /> <br />-- <br />Fractiun, r - ` <br />Area CN Total Area ~ S -_ _Q ~_Wei~c hted <br />109E S1 ~ 0.05 !9.61 i 0.008 ~ - <br />Absarokee ~ ~ <br />101E I67 I 0.85 4.92 0.241 ~ 0.205 <br />Beenom <br />R-1 ~ 70 <br />Rock Outcrop I <br />0.10 X4.28 <br />0.321 0.032 <br />-,--- + - - ---- T_ <br />Total 1.00 I Q= 0.237 in. <br />Peak Flow = (0.241 in)* {22.5 cfs/in.)** = 5.42 cfs <br />*Maximum runoff from either Table 1 or Table 2 (new 24" culvert at 1% = 8.42 cfs) <br />~ **Figure S-lA, "Peak Flows in Colorado" <br />• <br />