Velocity formula
Velocity = Distance/Time
Flow rate equation
Q = Velocity x Area
Volume of a cylinder
V=πr²H
A Water storage tank contains 2,400 Cubic feet of water. How many gallons of water are in the tank?
17,952 Gal
Equation
(Length, ft) x (Width, ft) x (Height, ft) x 7.48 gal/cu. ft.
How many gallons of water are in a circular water storage tank 20 feet in diameter when the water is 6 feet deep?
14,092 Gal
Equation
(0.785) x (Dia, ft)2 x (Height, Depth, or Length in ft.) x 7.48 gal/ft3
How many pounds of water are in a tank that contains 2,000 Gallons of water?
16,680 lbs
To find pounds multiply Gallons by 8.33
1 Gal = 8.33 pounds
A pressure gauge on a fire hydrant reads 75 feet of pressure head . What is the pressure in pounds per square inch ?
- 34.6 psi
- 26.0 psi
- 32.5 psi
- 39.0 psi
- 37.1 psi
32.5
Formula
(Head, ft x 0.4335 psi/ft )
75 x 0.4335= 32.5
During pressure testing of a distribution system, a pressure gauge reads 35 pounds per square inch. What is the pressure head in feet ?
- 75 ft
- 92 ft
- 69 ft
- 81 ft
- 104 ft
81 ft
Formula
Pounds/square inch x 2.31
35 x 2.31= 80.85 -> round to 81ft
A pipe is teated during a 6-hour leak test on 600 feet of 6-inch diameter plastic pipe with a test pressure of 150 pounds per square inch(psi). The pipes are 10 feet long. During the 6 hour test period 8 gallons of water were added to maintain the 150 psi pressure. What is the actual leakage from this se took of pipe in gallons per hour 100 joints ?
- 2.2 gal/h/100 joints
- 1.4 gal/h/ 100 joints
- 2.8 gal/h/ 100 joints
- 2.5 gal /h/ 100 joints
- 1.6 gal/h/ 100 joints
2.2 gal/h/ 100 joints
What is the actual leakage in gallons per day per mile per inch from a new section of pipe if the leak rate during the test period was 40 gallons per day ? The section tested is 0.30 miles long and the pipe diameter is 15 inches
- 13 gpd/mi
- 5 gpd/ mi
- 7 gpd/ mi
- 9 gpd/ mi
- 11 gpd/ mi
9 gpd
What is the chemical feed of chlorine in pounds per day from a hypochlorinator if the hypochlorite solution is 1.5 percent or 15,000 milligrams chlorine per liter? During a test run, the hypochlorinator delivers 500 milliliter a in 12 minutes .
- 1.8/lb/d
- 1.6/lb/d
- 1.3/lb/d
- 1.0/lb/d
5: 2.0/lb/d
2.0/lb/d
What horse power must a pump deliver to water that must be lifted 100 feet when the flow is 100 gallons per minute?
- 3.16 hp
- 2.90
- 2.02 hp
- 2.27 hp
- 2.53
2.53 hp Formula (GPM)x(total head,Ft) —————————————- (3960 gal/min/ft)
100gpmx100ft
—————————=2.52 (round)
3960
A trench 4 feet wide, 600 feet long, and 6 feet deep is to be excavated for a water main. How many cubic yards of soil must be excavated for the water main?
- 948 yd(3)
- 729 yd(3)
- 370 yd(3)
- 237 yd(3)
- 533 yd(3)
533 yd (3)
During a test of totalizing flowmeter, the water depth rose 15 inches in a tank 18 inches in diameter. What was the total flow in gallons?
- 17 gal
- 29 gal
- 66 gal
- 39 gal
- 49 gal
17 gal
How many kilowatt hours per day are required by a pump with a motor horsepower of 35 horsepower when the pump operates 8 hours per day?
- 209 kWh/d
- 149 kWh/d
- 179 kWh/d
- 284 kWh/d
- 328 kWh/d
209 kWh/d
