A rectangular channel has a width of 9 meters and is flowing at a temperature of 20 degrees Celsius. Using the flow rates of 2 m3 /s, 4 m3 /s, and 6 m3 /s a) Plot the specific energy curve (depth versus energy) for each flow rate. Make sure that the curves encompass both subcritical and supercritical sections (both axes should be from 0-1 and Please see the note above regarding plots. Provide sample calculations for the specific energy of Q = 4 m3 /s y=0.2 m b) Using the curves, estimate the critical depths for each flow rate. Compare these values to the critical depth computed using the standard equation as a check to whether or not the plot is correct.