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Subject CULVERT ADEQUACY <br />_ "~ibbard Canyon Ventilation Facilities <br />~. 2 Somerset Coal Mine- Culverts in Drill <br />gad South of Fan Pad <br />July 14 1981 <br />Sheet No. 1 of 1 Sheets <br />CALCULATION NOTES <br />By BAF <br />Checked <br />Acct <br />Table 1, Area- Acre Convercino and WetgYlted Curve Numbers AMC-f[ <br /> <br />Area <br />CN Sq. In. <br />1"=2000' Fraction <br />Acres Tutal Acres Weighted Runoff <br />CN i Calculation Data <br /> I CN= 58 <br />R-1 70 0.81 J.4 I 0.12 ~ 8.4 I S= 7.24 <br /> i ~ -24) <br />i P= 2.2" (2 <br />58-NF 51 0.388 35.6 I 0.59 j 2 <br />30.9 I Q= P-0.2S) <br />101-F 67 0.173 15.9 I 0.26 17.4 i P+ 0.85 <br />109-E 51 0.018 1.7 I 0.03 15.] ~ ' <br /> <br /> <br />_Total I _ <br /> <br />____I <br />I <br />~ I r <br />SR_7 I Q= n nn ;,, <br />~T-. 1~1.. 7 <br />Area <br />Weighted Runoff Quanti <br />Fraction <br />CN ,Total Area S <br />R-1 ' 70 ~ 0.12 14.28 0 .321 <br />58-NF 51 0.59 9.61 0 .008 <br />101-F 67 0.26 4.92 0 .241 <br /> <br />109-E ~ 51 0.03 19.61 0 .008 <br />I Total I ! 1.00 I I <br />~ -^-~ <br />I Wei9hted_~ <br />fi- <br />~ 0.039 <br />0.002 <br />0.063 <br />~ Q= 0.104 in. ~ <br />Peak Flow = (0.104 in.)* (4.6 cfs/in)** = 0.478 cfs <br />*Maximum runoff from either Table 1 or Table 2 (two existing 8" culverts at 8Y- <br />**Figure S-lA, " Peak Flows in Colorado" Each capable of 1.88 cfs) <br />• <br />