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Part A Water flows with a velocity of 2.4 m/s and at a depth of 3 m 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). 1 1 Please enter the change in water surface elevation (hint: a negative indicates a reduction, positive an increase). 1 单位 Does the upstream depth change? O Upstream is not changed O Upstream is changed What is the maxium size of the upstep that could exist before the upstream depth changes as a result? 1 1 Part B What is the above system (i.e. velocity =2.4 m/s, depth = 3 m, rectangular channel) instead experienced a downstep of 30 cm? Please enter the change in depth (hint: a negative indicates a reduction, positive an increase). 1 1 Please enter the change in water surface elevation (hint: a negative indicates a reduction, positive an increase). 1 1