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Find the new dimensions and increase in discharge.


A rectangular channel 4m wide has depth of water1.5m. The slope of the bed of channel is 1 in 1000. C=55. It is desired to increase the discharge keeping i & C constant.Find the new dimensions and increase in discharge.

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Given,

  • b = 4m
  • d = 1.5m

  • i = 11000

  • C = 55

i.e.Area=bd=41.5=6m2


Wetted Perimeter,P=d+b+D=1.5+4+1.5=7m

$ m = {A \over …

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