Page 97 - Water and wastewater engineering

2-40 WATER AND WASTEWATER ENGINEERING

10. Use mass balance techniques to estimate the required volume of a small reservoir.
11. Estimate the maximum sustainable drawdown of a well pumping from a confined aquifer.

12. Compare the results of a water analysis with water quality criteria and determine defi-
ciencies that need to be remedied by treatment.
13. Estimate the demand flow rate for the average day, maximum day, and peak hour for a
small nonindustrial community.

2-8 PROBLEMS
3
2-1. Estimate the demand (in m /d) of a new suburban subdivision of 333 houses for the
average, maximum, and minimum day. Assume that both the AWWA household
average demand and Figure 2-1 apply. Also assume that each house is occupied by
three residents.
2-2. A resort community has been platted in Arizona. The year round population when
it is fully developed is estimated to be 7,000. A gross estimate of the average day
demand is required for planning purposes. Using Hutson et al. (2001) and census
population data, estimate the demand. Assume that the “public water supply”
category applies.

2-3. A ski lift operation in Colorado plans to expand to include a 250 room hotel, a res-
taurant to seat 250, and dormitory-style living quarters for a staff of 25 individuals.
Estimate the increase in average daily demand during the ski season that must be pro-
vided. Assume the average hotel occupancy is two people per room.
2-4. Using a spreadsheet you have written, perform a complete series analysis on the data
for the Squannacook River near West Groton, MA, given on page 2-41 Plot a yield
curve. What is the safe yield of the river if the regulatory agency will allow a with-
drawal of 6%?
2-5. Using a spreadsheet you have written, perform a complete series analysis on the data
for the Clear Fork Trinity River at Fort Worth, TX, given on page 2-42. Plot a yield
curve. What is the safe yield of the river if the regulatory agency will allow a with-
drawal of 3%?
2-6. Using a spreadsheet you have written, perform an annual minima analysis on the data
for the Squannacook River near West Groton, MA, given on page 2-41 Plot the data
on Gumbel paper and determine the minimum monthly discharge for the mean an-
3
nual drought. If the demand is 0.131 m /s, will storage be required if the regulatory
agency will allow a withdrawal of 6%?
2-7. Using a spreadsheet you have written, perform an annual minima analysis on the data
for the Clear Fork Trinity River at Fort Worth, TX, given on page 2-42. Plot the data
on Gumbel paper and determine the minimum monthly discharge for the mean
3
annual drought. If the demand is 0.021 m /s, will storage be required if the regulatory
agency will allow a withdrawal of 3%?