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Subwatershed Type CP Area CP X Area <br />III MB 0.0002 13.2 0.0026 <br />Sage 0.0006 4.4 0.0026 <br />• <br />T.S. Rem. 0.586 5.6 3.2816 <br />Spoil 0.486 24.0 11.6640 <br />Recl. 0.0031 85.5 0.2651 <br /> 132.7 15.2159 <br />Weic~ted CP = 15.2159 = 0.1147 <br />132.7 <br />Section Properties - Diversion No. 1 <br />Diversion No. 1 was designed as either an erodible (Case 1), tton-erodible <br />(Case 2), or riprapped (Case 3) trapezoidal shaped ditch, depending on the <br />slope and composition of the wnstructing material. The maxitmTm average <br />slope of the ditch was estimated to be 14.6 percent (see Ddiibit 7-7) . <br />SFDCADF was used in the design of this diversion (see Adderxhm 7-6f-C) for <br />the SEUCADi- cot~uter runs for the various cases). <br />• In Case 1 (slope less than 3.5 percent), an erodible channel was designed <br />with a flow depth of 0.40 feet and velocity of 4.9 fps. This velocity is <br />below the limiting velocity for graded loam material. In Case 2 (slope <br />greater than 3.5 and competent non-erodible bedrock material), a <br />non-erodible channel was designed. This ditch will have a flaw depth of <br />0.26 feet at a velocity of only 7.60 fps. This velocity is well within <br />accepted velocities of tinder 10 fps. In Case 3 (slope greater than 3.5 <br />percent, erodible material), a riprapped trapezoidal channel was designed <br />for Diversion No. 1. The diversion will have a depth of flow of 0.18 at a <br />velocity of 5.2 fps. The riprap will be keyed into the adjacent sections. <br />The ditch will have a minimum depth of 1.5 feet to allow for freeboard. <br />The results are summarized in Table 7-6f-14. <br />• <br />7-6f-14 Revised 11/13/91 <br />