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<br />reX) = .numerical first derivative of r(X); <br />{"(X) = numerical second derivative of r(X); <br />H = head on low level outlet; <br />H. = head on spillway; <br />K = orifice discharge coefficient; <br />K, = weir discharge coefficient; <br />k = number of damage locations; <br />L = length of spillway; <br />n = number of system components optimized; <br />Q = flow rate; <br />Q, = target flow for target degree of protection; <br /> t <br />Q, = flow (stage) for target degree of protection; <br />X = size of variable being optimized; <br />Z = system performance index; and <br />aX = incremental change in X. <br /> <br />.t <br />