Design of Sewer System

You will learn best by doing your own homework. Good luck with your studies.

I am not asking anyone to do my homework..sorry if it seems that way I am just asking if anyone has tables so i can do the calculation. Hope you do know that tables are generally known things in field of engineering and does not represent solution of any problem but just DATA for reaching the result... ;)

I am not asking anyone to do my homework..sorry if it seems that way I am just asking if anyone has tables so i can do the calculation. Hope you do know that tables are generally known things in field of engineering and does not represent solution of any problem but just DATA for reaching the result... ;)

A sewer is designed as open-channel flow meaning the pipe is not flowing full. Use Manning's formula and the equation of continuity (Q=VA).

By Manning:

v= (1.486R (raised to 2/3 power) S (raised to 1/2 power)) / n

(units are feet per second)

n (Manning's n) will vary depending on pipe smoothness. Velocity must be 2 fps min and 10 fps max.

R is the hydraulic radius

S is the pipe slope.

You will pick a pipe diameter large enough for your flow (Q) requirement. Remember to express Q in fps, not gpm or MGD.

Repeat for each pipe. When you come to a node, add the flows.

You will have to determine design flow according to local standards. That is the biggest challenge, not plugging into the formula.

It is unfortunate that you can't find a nomograph that you can read. Any text book in any library will have these.

If you have an HP calculator, Manning's equation can be solved for.

Good luck!

Isco Open Channel Flow Measurement Handbook (Third Edition) is a decent source of info.

ISBN 0-9622757-0-0

Thank you all for help :)

What are the other students reading?