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Trapezoidal Channel Capacity Worksheet <br />Project: CC&V VLF <br />Client: CC&V <br />By: JFL <br />Date: Oct. 22 2008 <br />Description: Berm raise surface water capacity <br />Mannings equation: Open Channel Flow - <br />Q= 1.49/n' A • RA2/3' SA1/2 <br />A=AREA SF <br />R=HYDRAULIC RADIUS FT <br />S=SLOPE FEET/FOOT <br />Q=CFS <br />Trapezoidal Channel <br /> CALCULATIONS <br />CHANNEL BOTTOM CHANNEL BOTTOM CHANNEL <br />I CHANNEL SIDE SLOPE <br />I <br />I HYDRAULIC <br />WIDTH, FT WIDTH, m DEPTH, FT DEPTH,m 2:1 MANNING'SN SLOPE% AREA, ftA2 RADIUS Q. CFS Q,GPM Velocity (fps) 0, CMS VA2/rA.33 <br />2 0.6 0.1 0.0 2 0.08 8.6 0.22 0.09 0 108 11 0 3 <br />2 0.6 0.2 0.1 2 0.08 8.6 0.48 0.17 1 355 1.6 0 5 <br />2 0.6 0.3 0.1 2 0.08 8.6 0.78 0.23 2 725 2.1 0 7 <br />2 0.6 0.4 0.1 2 0.08 8.6 1.12 0.30 3 1,218 2.4 0 9 <br />2 0.6 0.5 0.2 2 0.08 8.6 1.50 0.35 4 1840 2.7 0 11 <br />2 0.6 0.6 0.2 2 0.08 8.6 1.92 0.41 6 2,597 3.0 0 12 <br />2 0.6 0.7 0.2 2 0.08 8.6 2.38 0.46 8 3,496 3.3 0 14 <br />2 0.6 0.8 0.2 2 0.08 8.6 2.88 0.52 10 4,544 3.5 0 15 <br /> Mannings Earthen Rock Nat'l Stream Mtn. Lined Lined Dragline Rock Rip- Channel Dense Winding <br /> n: Clean Rough Clean Sream Shotcrete Concrete Excavat. Rap Lined w/ Veget. Brush Channel <br /> Min. 0.016 0.035 0.025 0.040 0.015 0.015 0.025 0.030 0.022 0.080 0.023 <br /> Avg. 0.018 0.040 0.030 0.050 0.016 0.017 0.028 0.040 0.027 0100 0.025 <br /> Max. 0.020 0.050 0.033 0.070 0.018 0.020 0.033 0.050 0.033 0.140 0.030 <br />V