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Profiles in Compound Channels • A long channel has a compound cross section and a free over fall at the downstream end. The channel discharge is 2.5 m3/s, and the Manning n for the main channel and for the floodplain are 0.013 and 0.0144 respectively. Discuss and sketch the water surface profile for the following four channel bottom slopes, There are three critical depths: (Choudhry, 2008)