The open channel flow calculator select channel type trapezoid triangle rectangle circle select parameter for solving velocityvdischargeq channel slope from v channel slope from q manning coefficient from v manning coefficient from q depth from q rightslope from q even slope from q leftslope from q. The channel can be any shape circular rectangular triangular etc the units in the manning equation appear to be inconsistent however the value k has hidden units in it to make the equation consistent the manning equation was developed for uniform steady state flow see discussion and references for open channel flow. Introduction a common use of the manning equation is for water flow rate calculation in an open channel it can also be used to calculate values of other uniform open channel flow parameters such as channel slope manning roughness coefficient or normal depth when the water flow rate through the open channel is known. The manning formula can be used to calculate the flow of water in open non full channels and pipes without the need for a flume weir or other structure while not a accurate as flows calculated with those structures the manning formula is accurate enough for some applications. Engineeringcoms open channel flow calculator calculates the wetted perimeter hydraulic radius flow area chezy coefficient and flow velocity using chezy and mannings formula
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