$8\mathrm{.}8\mathrm{.}3.$ At design conditions, a $25-$m$-$wide overflow spillway $)=(2\mathrm{.}0$ operates urider a headwater of $1$ m $.$ The downstream pool is $14$ m below the overflow spillway crest. A siphon spillway is being considered as an aiternative to the overflow spillway. Determine the width of a rectangular siphon spil: way that has a $1$ m opening height and discharges the same flow rate at the same reservoir elevation. Assume the siphon losses are $5(\frac{V^2}{2}g).$

THE CORRECT ANSWER IS; W $=6\mathrm{.}52$m