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i <br />Subject CULVERT ADEQUACY <br />,Hubbard Canyon Ventilation Facilities <br />2 - Somerset Coal Mine _ <br />~ • hs i de of Fan Pad <br />BY BAF <br />Checked <br />Acc'[ <br />July 2 1981 <br />Sheet No. 1 of 1 Sheets <br />?ab3e 1, Area- ~+cre Convers]11D ana We~yhred Curve Numbers AMC=f1 <br /> <br />Area <br />CN Sq. In. <br />1"=1pp~ I Fraction I Weighed I kunoff <br />Acres Total Acres CN i Calculation Data <br />- -- <br />-- <br />~ I <br />~ <br />~ CN= 56 <br />109E 51 6.99 1.61 0.697 ~ 35.5 ; S= 7.86 <br />Absarokee r i p= 2.2" (25-24) <br />101E 67 ' 3.18 0.70 I 0.303 ~ 20.3 Q= (P-0.25)2 <br />I <br />Beenom P+ 0.85 <br />~ ' <br /> <br /> f <br />10.17 f 2.31 <br />,y.~ Table 2 <br />Area <br />109E <br />Absarokee <br />101E <br />Beenom <br />Weighted Runoff Quantity _ _ _ <br />-~ i\MC- f I _ _ _ <br />Fraction <br />CN Total Area ~ ` <br />I S ~ Weighted i <br />i <br />1 j 0.697 <br />7 0.303 <br />i <br />~ ~ <br />61 0.008 I 0.006 ~ <br />I <br />g2 0.241 I 0.073 <br />Total ~ ~ --~ j . __ ___ 1-_4= 0, 079 i n._~ <br />Peak Flow = (0.079 in.)* (4.6 cfs/in.)** = 0.363 cfs <br />*Maximum runoff from either Table 1 or Table 2 (new 12" culvert at 1% = 1.70 cfs) <br />**Figure S-lA, "Peak Flows in Colorado" <br />• <br />