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69 06/23 1012e S 303 565 9947 SRK DENVER <br />`i u <br />CULVERT DESIGN SUMMARY <br />SAN LUIS PROJECT <br />(SRK PROJECT N0. 14702) <br />1. Haul road culvert design - additional culvert dust south of the Rito Seco. <br />Drainage area 276 ac <br />Length - 8,700 ft <br />Overland slope - 129'. <br />CN - 70 <br />100-yr precip 2.9 inches <br />Peak flow per WASHED 108 cfs (WASHED printout attached) <br />Assuming inlet control: (ref. AISI Handbook, 1983) <br />Need a 48-inch diameter CMP with HWD - 1.5* <br />2. Replace 2 - 42 inch CMP 0 West Pit/WRD Area C with a single CMP: <br />Q - 185 cfs (Table D.9-2) <br />Replace with a 60-inch diameter CMP 0 HWD - 1.4* (A1Si, 1983) <br />3. Replace 2 - 54 inches CMP ® SWRDF crossing with a single CMP: <br />Q - 365 cfs (Table D.9-2) <br />Replace with a 72-inch diameter CMP 0 HWD - 1.75* (AISI, 1983) <br />*Place all Culvert 0 three percent minimum slope to ensure inlet control. <br />03 <br />~~ ..PERMIT BOUNDARY ~_-- ;~ ~,.-.... ~., r , ~ . •, -- <br />