Determine the minumum slope as a percentage for a full 150

Solution

Solution:-

Given

Diameter of pipe (D) = 1500 mm

Let minimum cleansing velocity(V) = 762 mm/s

Let Manning Coefficient(n) = 0.013

Hydraulic mean depth(R) = D/4 = 1500/4 = 375 mm

We know that

V = 1/n * R^2/3 * S^1/2

762 = 1/(0.013) * (375)^2/3 *(S)^1/2

Slope (S) = 0.03628

Minimum Slope (S ) =3.6 %    Answer