The discharge passing through an open channel having a rectangular cross-section is 75 m/s. The specific energy curves of the channel reach having a transition are given with some numerical data on the figure. Flow in the upstream of the transition is in subcritical state with a specific energy of 5.0 m. Transition takes place over a horizontal reach of the channel. For the given data, a) Determine the critical depths at sections (1) and (2). b) Determine the channel widths at sections (1) and (2). c) Determine the water depth at section (1). d) Show that there is choking. e) Determine the minimum change in bed elevation (upward or downward) at the transition to prevent choking. f) Draw the side and plan views of the channel (for part e) indicating the water surface profile with the numerical values of water depths at sections (1) and (2). g) Indicate the specific energies, water depths and the step height on the specific energy y (m) curves. q1 q2=25 m/s/m R E (m) 4.262 m