Chapter 1 FE EXAM FORMATTED PROBLEMS
1-1.
A residential development of 320 houses is being planned. For planning purposes an
average daily consumption of 120 gpcd is used. Estimate the average daily volume of
water that must be supplied to this development if each house is occupied by 4 people.
(320 houses)(4 people/ house)(120 gpcd)  153,600 gallons/ day
1-2.
The maximum day demand for a current population of people is 90 MGD. The maximum
day demand 20 years from the current estimate is 120 MGD. The following assumptions
were made for the estimate: peaking factor = 1.5; average day demand remains constant
at 150 gpcd over the 20 year period; population growth is exponential. What annual rate
of population growth was used for the estimate?
120 MGD  90 MGDek 20
1.33  e k 20
ln(1.33)  k (20)
k  0.0144
(0.0144 )100 %  1.44%
1-3.
State University has a resident population of 43,000. If the average day demand is 300
Lpcd, what average flow rate per day (in m3/d) for a community of 20,100 that has an
average day demand of 960 Lpcd.
(43,000 people)(300 Lpcd)
 1.29m3 / d
1000 L 3
m
1-4.
If 60 percent of the average household water use in a dry climate is used outside of the
house, what is the estimated wastewater flow rate (in m3/d) for a community of 20,100
that has an average day demand of 960 Lpcd.
(20100 people)(960 Lpcd )(1.00  0.60)
 7.72 10 3 m3 / d
1000 L 3
m