Environmental Engineering FOURTH EDITION

166 ENVIRONMENTALENGINEERING

8.3 A 48-in. circular sewer is required to discharge 100 cfs when full. What is the

8.4 A 12-in. concrete sewer, flowing just full, is laid on a grade of 0.00405 ft/ft.

8.5 AlZin. sewer,n = 0.013, islaidonagradeof3.0ft/lOOOft. Findthevelocity

required grade, according to the Manning formula, if n = 0.015?

Find the velocity and rate of discharge.

and rate of discharge when the sewer is flowing 0.4 full.