CE$310$

Water Resources Engineering

Consider the overflow spillway shown in figure. The design spillway discharge is computed

as $Q=180\frac{m^3}{s}.$ The total crest length of the spillway is $10m.$ The approach channel stilling

basin and downstream section are of rectangular cross$-$section having $10m.$ There are two

rounded nosed piers, each one$-$meter thick. Headwalls of rounded abutments makes angle less

than $45$ with the flow direction. Ignoring the head losses over the spillway and over a

possible downstream end sill, determine:

a$)$ The design spillway head;

b$)$ The required lowering of the tiver bed for the stilling basin; and

c$)$ The type and dimensions of the stilling basin.