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W.o. 2937 <br />SHERIDAN ENTERPRISES - COMA COAL PROJECT <br />DRAINAGE CALCULATIONS <br />Starting at the uppermost pipe <br />Basin Contributory to 48" 0 Pipe <br />Area - 68.9 AC. <br />Time of Concentration - Nomograph <br />H - 6900-5700 - 1200 <br />L - 3500 <br />Tc - 6.5 Min. <br />1 - 0.4 In./H r. <br />Q - C1A - (0.4)(0.4)(68.9) - 11.0 cfs <br />Capacity of 48" 0 CMP <br />Q - .0^061 s} D8/3 - 77 cfs <br />where n - .024 <br />s = .O1 (assumed) <br />Basin Contributory to first 18" 0 Pipe <br />Area - 35.6 AC. <br />• Tlme of Concentration - Nomograph <br />H - 6525=5680 = 845 <br />L 2500 <br />Tc = 5 Min. <br />I - 0.4 In./Hr. <br />Q - C1A = (0.4)(0.4)(35.6) = 5.7 cfs <br />Capacity of 18" 0 <br />Q - .0^061 s} D8/3 - 5.7 efs ' <br />Basin Contributory to second 18" B Pipe <br />Area - 3.7 AL. 18" 0 has adequate capacity. <br />Basin Contributory to third 18" 0 Pipe <br />Area - 22.7 AC <br />Tc - 60 Min. <br />1 - 0.8 In./Hr. <br />Q - CIA = (0.4)(0.8)(22.7) - 7.2 cfs 18" 0 pipe has adequate capacity. <br />• <br />-ll- <br />