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'~ 2. Free outfall <br />CMP diameter <br />12 in. <br />From: Mear's 4later Flow Calculator for pipes, ducts, and Sewers using the <br />rational formula and Moody's pipe roughness and frictional coefficients <br />for various materials. <br />Q = 5.6 cfs > 4.08 cfs so ok. <br />LIGHT-USE ROAD - 80RRON DITCH <br />Segment 1 <br />Drainage Area 8.7 acres (Oak-Aspen; Hydrologic <br />Rainfall (10 yr., 24 hr.) 1.8 inches Soil Group C, ground <br />Curve Number 67. Fig. S-3 cover density - 30X) <br />Runoff (10 yr „ 24 hr.) 0.12 inches. Table S-3 <br />Peak Discharge 13 cfs/inch of runoff, Fig. 0-2 (steep slopes) <br />Peak Discharge = (13 cfs/inch) (0,12 inches) <br />= 1.56 cfs <br />Segment 2 <br />Drainage Area 2.1 acres (Oak-Aspen; Hydrologic <br />Rainfall (10 yr ., 24 hr.) 1.8 inches Soil Group C, ground <br />Curve Number 67. Fig. S-3 cover density - 30X) <br />Runoff (10 yr „ 24 hr.) 0.1 2 inches. Table 5-3 <br />Peak Discharge 4.7 cfs/inch of runoff. Fig. D-2 (steep slopes) <br />• <br />Peak Discharge = (4.7 cfs/inch) (0.12 inches) <br /> = 0.564 cfs <br />(5) <br />