The same rectangular structure of width $b=5m$ and height $15m$ is now positioned in a

channel of $25m$ width. The discharge Q through the channel is $250m^3{s}^{-1}$ and the height $h$

of water is $5m.$

What is the flow velocity $U$ upstream of the structure where the channel width is $25m?$

Give your answer rounded to $2$ decimal places $($you do not need to input units, only the

numerical answer$).$

$(2$ marks$)$

Answer: