WATER DISTRIBUTION LATEST
MATH EXAM
Find the pounds of 65% HTH required to disinfect a 12-inch diameter
main 1,000 feet long at a chlorine dose of 25 ppm? Find the pounds of
HTH required. - ANSWERS-1.88 Ibs
Approximately how long could you provlde water in hours and minutes,
from a full reservoir measuring 32'ft. high and 60'ft, in diameter with a
demand of 1,800 gpm? - ANSWERS-6 hours, 16 mins.
Approximately how long would it take to empty a reservoir through a 8
inch outlet flowing at a constant rate of 2cfs, if the cylindrical tank has a
height of 28 feet and a radius of 28 feet. - ANSWERS-9 hours, 34 mins.
Find the volume of water in acre feet contained in an 80 ft. radius
storage tank with a pressure transducer indicating 20 psig at the base of
the tank? - ANSWERS-21.3 AF
At 8:00am a pressure transducer used to measure water level indicates
12 psig for a 100 foot diameter water storage tank, at 6:00pm the
pressure transducer indicates 4 psig. Determine the gallons of water used
during the 10 hour period? - ANSWERS-1,085,109 gallons
END OF
PAGE 1
, WATER DISTRIBUTION LATEST
MATH EXAM
Find the Total Dynamic Head of a pump that has a suction lift of 165'ft.
and a discharge pressure of 98psi. - ANSWERS-391'ft.
How many pounds per day are required to disinfect a flow of 5MGD at a
dose rate of 2.25mg/L? - ANSWERS-93.8 Ibs./Day
If 155 pounds per day of chlorine gas are required to disinfect a
treatment plant at a dose rate of 1.25ppm. What is the average flow in
gallons per minute of the plant? - ANSWERS-10,325 gpm
Find the gallons per day of 12.5% sodium hypochlorite sp. Gr. 1.24
required to disinfect a well when the discharge flow is 800 gpm and the
applied chlorine dose is 3.0 ppm? Convert gpm to MGD - ANSWERS-
22.6 gallons/day
A well operates at a rate of 1.5cfs and for an average of 20 hours per
day. The well is disinfected using chlorine gas at a rate of 0.75ppm.
Chlorine gas costs $1.07 per pound. What is the monthly chlorine cost to
operate the well? - ANSWERS-$162.20
Determine the TDH for a well using the following data: discharge flow
2,200 gpm, static level 220 feet, pumping level 305 feet, discharge
END OF
PAGE 2
MATH EXAM
Find the pounds of 65% HTH required to disinfect a 12-inch diameter
main 1,000 feet long at a chlorine dose of 25 ppm? Find the pounds of
HTH required. - ANSWERS-1.88 Ibs
Approximately how long could you provlde water in hours and minutes,
from a full reservoir measuring 32'ft. high and 60'ft, in diameter with a
demand of 1,800 gpm? - ANSWERS-6 hours, 16 mins.
Approximately how long would it take to empty a reservoir through a 8
inch outlet flowing at a constant rate of 2cfs, if the cylindrical tank has a
height of 28 feet and a radius of 28 feet. - ANSWERS-9 hours, 34 mins.
Find the volume of water in acre feet contained in an 80 ft. radius
storage tank with a pressure transducer indicating 20 psig at the base of
the tank? - ANSWERS-21.3 AF
At 8:00am a pressure transducer used to measure water level indicates
12 psig for a 100 foot diameter water storage tank, at 6:00pm the
pressure transducer indicates 4 psig. Determine the gallons of water used
during the 10 hour period? - ANSWERS-1,085,109 gallons
END OF
PAGE 1
, WATER DISTRIBUTION LATEST
MATH EXAM
Find the Total Dynamic Head of a pump that has a suction lift of 165'ft.
and a discharge pressure of 98psi. - ANSWERS-391'ft.
How many pounds per day are required to disinfect a flow of 5MGD at a
dose rate of 2.25mg/L? - ANSWERS-93.8 Ibs./Day
If 155 pounds per day of chlorine gas are required to disinfect a
treatment plant at a dose rate of 1.25ppm. What is the average flow in
gallons per minute of the plant? - ANSWERS-10,325 gpm
Find the gallons per day of 12.5% sodium hypochlorite sp. Gr. 1.24
required to disinfect a well when the discharge flow is 800 gpm and the
applied chlorine dose is 3.0 ppm? Convert gpm to MGD - ANSWERS-
22.6 gallons/day
A well operates at a rate of 1.5cfs and for an average of 20 hours per
day. The well is disinfected using chlorine gas at a rate of 0.75ppm.
Chlorine gas costs $1.07 per pound. What is the monthly chlorine cost to
operate the well? - ANSWERS-$162.20
Determine the TDH for a well using the following data: discharge flow
2,200 gpm, static level 220 feet, pumping level 305 feet, discharge
END OF
PAGE 2
