Design an overflow spillway including the profiles using the data given below.

To dissipate the energy below the spillway, it is proposed to form a hydraulic jump

in a stilling basin at the toe of the spillway. Calculate the length and height of the

sidewall of the stilling basin.

Height of the spillway crest is $50$ m

Number of spans is $10$

Length of each span $($clear$)$ is $12\mathrm{.}5$ m

Downstream slope of the spillway is $0\mathrm{.}75($H$)$ : $1($V$)$

Rock condition is good

Design discharge is $8500$ m$3/$sec

Coefficient of discharge is $2\mathrm{.}2$

Kp is $0\mathrm{.}01$

Ka is $0\mathrm{.}10$

For vertical upstream face is K $=2$ and n $=1\mathrm{.}85$