(Solved): A gravity dam is constructed with an overflow spillway. The head over the crest is 2m. The spillw ...

A gravity dam is constructed with an overflow spillway. The head over the crest is $2\mathrm{m}$. The spillway is $5\mathrm{m}$ high and $25\mathrm{m}$ long. The upstream face of the spillway is vertical. The water depth at the downstream apron is $1\mathrm{m}$. A bridge is to span the crest with three rounded nose bridge piers of $50\mathrm{cm}$ wide. The abutment walls are square with head wall $90^{?}$ to the direction of flow. Determine the discharge capacity of this spillway.