5 For a storm sewer design project it is known that the maxi

5. For a storm sewer design project, it is known that the maximum flow rate for the design storm is XYZ cfs. The circular concrete pipe is selected for the design. The slope of the pipeline is 1.1%. what size of the commercial pipe should be used in English unit? (Note: XYZ-last 3-digit of your Student ID Number.If XYZ 100, then add 200.) XYZ = 938

Solution

Solution:-

Given

Q = 938 cfs

S = 1.1 % = 0.011

Let   Manning coefficient( n ) = 0.03

Diameter of sewer (D) = ?

We know that

Q = AV

Q = /4* D² * 1/n * (R )^(2/3) S^(1/2)

938 = /4 * D² * 1/(0.03) *(D/4)^(2/3) * (0.011)^1/2

D = 12.60 feet       Answer