A concrete culvert $0\mathrm{.}90$ m in diameter and $60$ m long is laid on a slope of $0\mathrm{.}005.$ It has

an apron type inlet and outlet. Determine the capacity, assuming that the outlet is

submerged $0\mathrm{.}90$ m and the control is at the outlet, if the maximum allowable head

water is $1\mathrm{.}20$ m above the inlet invert. For apron type outlet and inlet, ke $=0\mathrm{.}5$ and ko $=$

$1\mathrm{.}0$ with n $=0\mathrm{.}012$