PART A

Design a sewer running 0.7 times full at maximum discharge for a town provided with a separate sewer system, serving a population of 80,000 persons. The water supplied from the water works to the town is at a rate of 190 LPCD. The mannings n = 0.013 for the pipe material and permissible slope is 1 in 600. Variation of n with depth may be neglected. Check for minimum and maximum velocity assuming minimum flow 1/3 of average flow and maximum flow as 3 times the average. (for d/D = 0.7, q/Q = 0.838, v/V = 1.12)

PART B: Numerical problems for submission

Problem # 1 Solve the problem in PART A above when the population increased to 100, 000 persons and the allowable pipe flowing 0.75 full at maximum discharge. The rate of water supply has been reduced to 150 LPCD due to new water regulations introduced. The required pipe to be used also has n = 0.013, and permissible S = 1 in 600.

solve PART B