Given: There is a weir that causes the water level in a clean and straight rectangular natural channel

to be $30$ ft from the channel bottom. The channel has a bottom width of $70$ ft $.$

The slope of the channel is $0\mathrm{.}008$ and the discharge rate is $1370$ cfs $.$

There is a bridge $2,500ft$ upstream $.$

Find: $($a$)$ Channel distance affected by the weir.

$($b$)$ Is the velocity acceptable everywhere? How do you know? $(5\%)$

$($c$)$ Elev of bridge bottom to be safe from flooding. $(5\%)$

Solution: