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There are different ways of writing the hazen -william friction loss equation depending on which system of units you are working with. If you want to calculate friction loss in feet then the equation is as follows:
hL = ((L)/(((6.27*10^-4)*C*D^2.63)^1.85))*Q^1.85
Where:
hL = Headloss (ft)
L = Length of pipe (ft)
C = Hazen William coefficient for the material that the pipe is made out of (unitless)
D = Diameter of the pipe you are working with (in.)
Q = Flow rate you are working with (cubic feet per second (cfs))
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