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<br /> <br />Existing Spillway <br />4 ~- y <br />A = b(d) + Z (d2) <br />A = 4(1.5) + 1(1.52) <br />= 7.75 ft.2 <br />s <br />), ,8„ <br />V = ~ = 2.0 ft.3/sec. 0.26 feet/sec. <br />A 7:7 <br />Mannings Equation <br />Sz = Vn <br />1.486 r 2/3 <br />SZ = 0.26 (0.027) <br />1.486 (0.94 2/3) <br />r = 7.5 = .94 <br />8.24 <br />_ .91 <br />n = .027 <br />S = 0.00003 ft./ft. <br />NOTE: Since the spillway runs down the face of the embankment, which is a <br />3:1 slope, the spillway is adequate. However, some form of slope <br />erosion protection should be provided. <br />