CE $382$

Hydraulic and Hydrologic Engineering

Homework #$9(10$ Points$)$

A residential subdivision of $800$ homes will be constructed with sewer service. The subdivision data is as follows:

a$.$ Estimated average water demand is $120$ gallons per$-$capita$-$day $($GPCD$)$

b$.$ Residential density is $2\mathrm{.}3$ persons per residential dwelling

c$.$ Peaking factor is $2\mathrm{.}0$

d$.$ Sewer discharge is $68\%$ of water demand

e$.$ Grade of the sewer line is $0\mathrm{.}0025$

f$.$ Manning $n=0\mathrm{.}010.$

g$.$ Available pipe sizes $6",8",10",12"$

Find the following:

$($a$)$ Size of the sewer such that the pipeline will flow less than $75\%$ full at peak demand.

$($b$)$ Flow velocity at peak discharge.

$($c$)$ Normal depth of flow.

Note: Show all your calculations.