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Design-of-sewers-Tutorial

Design a sewer to serve a population of 36,000. The water supply rate is 135 lpcd of which 80 % finds its way into sewer. The slope of sewer is 1 in 625 and sewer should be designed to carry four times dry wear flow when running full. What would be velocity of flow. Take N = 0.012

Solution:

Here, the design discharge is,

`Q=(0.8**0.135**36000**4)/86400`

`=0.18\ m^3/s`

From Mannings Formula,

`0.18=1/0.012 **(pi D^2)/4(D/4)^(2/3)**(1/625)^(1/2)`

or, `D=0.518\ m`

Now, the velocity is,

`V=0.18/((pi**0.518^2)/4)`

`=0.85\ m/s`

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Design a sewer to serve a population of 36

000. The water supply rate is 135 lpcd of which 80 % finds its way into the sewer. The slope of the sewer is 1 in 625 and sewer should be designed to carry four times the dry weather flow when running full. What would be the velocity of flow. Take N = 0.012

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Sanitary-Engineering