for this problem, let's assume that the lake does not go dry, we are not anchored,and there is no wind blowing....i found this equation for large apature gates and flow: flow = .66 X Cd X width of gate X (2G)^1/2 X (D1^3/2 -D2^3/2). I set Cd to .97 as the flow coefficient, D1 is the bottom of...