Flow Measurement through Trapezoidal & Rectangular Channels

Flow measurement or hydraulic formulas are used to measure the discharge/volume of water through canals,irrigation channels,watercourses,drain lines etc. Following is the brief descripion used to calculate the flow measurement or discharge of the trapezoidal sectioned channel.
b = bottom width                                                                              d = flow depth              
B = width at water surface = b + ( 2 x z x d )                                  FB = Free board
D = Total depth of channel = d + FB                                               BW = Bank width
Z = Side slope, ( Such as 1: 1 - 1.5 : 1  & 2 : 1)                              FSL = Full supply level
TW = total width of the ditch = b + ( 2 x Z x D)
So formula for trapezoidal channel flow quantity is

 A = b x d + Z x d²



For more Detail and in figure detail click here

Ummm... what's the question?

Everyone knows that stormwater is the most difficult engineering...he's just showing off.

Oh for FFS... give it a rest. Everyone is burnt out.