$[$NOTE: THIS PROBLEM HAS BEEN SELECTED FOR HANDMARKING IN ADDITION TO MOBIUS GRADING$]$

Part A

Water flows with a velocity of $2\mathrm{.}8\frac{m}{s}$ and at a depth of $3m$ in a rectangular channel. If there is a gradual upward change in bottom elevation $($upstep$)$ of $30$

cm what is the change in depth and in water surface elevation?

Please enter the change in depth $($hint: a negative indicates a reduction, positive an increase$).$

Please enter the change in water surface elevation $($hint: a negative indicates a reduction, positive an increase$).$

Does the upstream depth change?

Upstream is not changed

Upstream is changed

What is the maxium size of the upstep that could exist before the upstream depth changes as a result?