Civil Engineering: Problems and Solutions, 15th Edition

Chapter 8: Water Quality, Treatment, and Distribution

Kenneth J. Williamson

PROBLEMS

8.1

A city uses a nearby river for a water source and pumps the water to the distribution system and to a storage tank. The required hourly flow rates for the maximum daily use are

Time of Day

Flow Rate (gpm)

12 PM

0

2 AM

4,000

4 AM

8,000

6 AM

12,000

8 AM

12,000

10 AM

12,000

12 noon

12,000

2 PM

12,000

4 PM

12,000

6 PM

12,000

8 PM

8,000

10 PM

4,000

  1. The maximum daily flow rate required for this system is

    1. 6000 gpm

    2. 8000 gpm

    3. 9000 gpm

    4. 10,000 gpm

  2. The storage requirements to supply the maximum daily flow, if a constant pumping rate is set at 10,000 gpm, is

    1. more than 6 MG

    2. from 4 to 6 MG

    3. from 2 to 4 MG

    4. from 1 to 2 MG

  3. If the fire flow is determined to be 6000 gpm, then

    1. the design flow would be 15,000 gpm

    2. the design flow could be less than, equal to, or greater than 15,000 gpm

    3. the required duration for the fire flow would be about 6 hours

    4. both (a) and (c)

  4. If a pumping rate of 8000 gpm was used on the maximum day, the storage tank would fill

    1. from 6 AM until 8 PM

    2. from 4 AM until 8 PM

    3. from 8 PM until 6 AM

    4. from 8 PM until 4 AM

  5. If the elevation of the load center is 40 ft above the water source, the height of the water above the water...

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