A rectangular channel 5.4 m wide and 1.2 m deep has a slope of 1 in 1000 and is lined with rubble masonry for which Manning's n=0.017.  It is desired to increase the discharge to a maximum by changing slope or the form of the section.  The dimensions of the channel may be changed but the channel must contain the same amount of lining.  Compute the new dimensions

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 A rectangular channel 5.4 m wide and 1.2 m deep has a slope of 1 in 1000 and is lined with rubble masonry for which Manning's n=0.017.  It is desired to increase the discharge to a maximum by changing slope or the form of the section.  The dimensions of the channel may be changed but the channel must contain the same amount of lining.  Compute the new dimensions.

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