:during a heavy rainstorm, water from a parking lot completely fills an 18-in.- diameter, smooth, concrete storm sewer. if the flowrate is 10 ft3/s, determine the pressure drop in a 100-ft. horizontal section of the pipe. repeat the problem if there is a 2-ft. change in elevation of the pipe per 100 ft. of its length.

Answer

diameter of parking lot = 18 in

flowrate = 10 ft³/s

pressure drop = 100 ft

using general equation

taking f = 0.0185

at Z₁ = Z₂

ΔP = 0.266 psi

b) when flow is uphill z₂-z₁ = 2

c) When flow is downhill  z₂-z₁ = -2

answer:

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