A river downstream of a hydroelectric dam is subject to daily flows of 12,000 cfs at a flow depth of 6 ft during power generation by the turbines. The channel is approximately trapezoidal in shape with a bottom width of 300 ft and side slopes of 1:1 in a silty clay. At a bend in the river where the radius of curvature is 1000 ft, the outer bank is eroding but the bottom is stable. Determine the size of angular rock riprap needed to protect the banks using the COE method. For a trapezoidal channel, assume that the side slopes will be re-graded to 1.5:1 and the rock will be laid at that same side slope.
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A river downstream of a hydroelectric dam is subject to daily flows of 12,000 cfs at...