Math Problems Flashcards
What is the capacity in gallons of a clarifier 20 ft long, 18 ft high, and 10 ft wide?
26,928 gallons
What is the capacity in gallons of a clarifier 15 ft wide, 45 ft long, and 12 ft high that is only 3/4 full?
45,441 gallons
What is the volume of a round storage tank in gallons that is 30 ft tall and 20 ft in diameter?
70461.6 gallons
A pump produces 300 gallons per minute. What is the flow in MGD?
.432174 MGD
A water treatment plant produces 1200 gallons per minute of finished water. What is the flow in MGD?
1.72 MGD
Determine the CI2 setting in pounds to treat a flow of 2 MGD with CI2 dose of 3.0 mg/l.
50 lbs
A plant has a flow of 480,000 gallons per day with a CI2 dose of 1.5 mg/l. Determine how many pounds of C12 is required?
6lbs
Calculate the alum dose rate in mg/l with a flow of 1.8 MGD and feeding 135 lbs/day of alum.
9 mg/l
Calculate the CI dose rate in mg/l with a flow of 1,500,000 gallons per day feeting 120 lbs of CI2
9.5 mg/l
Determine the flow in a plant if you are feeding 150 pounds of CI2 at 3 mg/l dosage.
6 MGD
Determine the flow of a plant in MGD that is dosing alum at 2 mg/l while feeding 115 lbs of alum.
6.9 MGD
Calculate the number of pounds of 64% HTH needed to dose at 3 mg/l while feeding 115 lbs of alum.
58.6 lbs
Calculate the number of gallons of 12.5% sodium hypochorite needed with a flow of .5 MGD with a dose of 2 mg/l
66.7 lbs
A rectangular channel is 3 ft wide, contains water 2 ft deep, while flowing 1.5 ft/per second. What is the flow rate in CFS?
9 CFS
A rectangular channel is 4 ft wide, contains water 3 ft deep, while flowing 90 ft per minute.. What is the flow rate in CFS?
18 CFS
Flow in 8” pipe is 500 gallons per minute. What is the velocity in ft/sec?
3.14 ft/sec
Flow in 6” pipe is 250 GPM. What is the velocity in ft/sec?
2.8 ft/sec
What would the static pressure at the bottom of a standpipe filled to the 85 ft level?
37 psi
What would be the static pressure of a tank 120 ft high with a maximum fill level of 115 ft?
49.7 psi
If a reservoir is 80 ft in diameter and contains 1.2 mg/l free chlorine and is 50 ft high, and filled to the 40 ft level, what is the pressure reading at 3.5 ft?
15.8 psi
You have a standpipe filled to the top, with a static pressure at the bottom of 40 psi. How tall is the standpipe?
92 ft
Your standpipe is 95 ft above ground level. Maximum fill level is 89 feet. Ground level elevation is 450 ft and the lowest elevation point in your system is 380 feet. Determine the pressure at the lowest point in your system.
68.8 psi
