Conversions
How many pounds are there in 1 cubic foot of water?
A. 7.48 lb/ft3
B. 8.34 lb/ft3
C. 62.4 lb/ft3
D. 83.4 lb/ft3
C. 62.4 lb/ft3
What is the area of a basin that is 225 ft long and 42 ft wide?
A. 70,686 sqft
B. 9,450 sqft
C. 5.36 sqft
D. 311,566 sqft
B. 9,450 sqft
(225)(42)
What is the volume of a tank that is 340 ft long, 28 ft wide, and 7.5 ft deep in cubic feet?
A. 71,400 cuft
B. 534,072 cuft
C. 9,520 cuft
D. 2,550 cuft
A. 71,400 cuft
What is the psi at the bottom of a tank if the water level is 24.3 feet deep?
A. 10.5 psi
B. 56.13 psi
C. 20. 2 psi
D. 24.3 psi
A. 10.5 psi
If the desired dose for chlorine is 2 mg/L, how many pounds of chlorine per day will be needed to treat 2.1 MGD?
A 35 lb
B. 53 lb
C. 24 lb
D. 72 lb
A. 35 lb
How much does 100 gallons of water weigh?
A. 748 Lb
B. 834 lb
C. 13.37 lb
D. 11.99 lb
B. 834 lb
What is the area of a circular pond if it has a diameter of 224 ft?
A. 39,400 sqft
B. 175 sqft
C. 157,500 sqft
D. 5,260 sqft
A. 39,400 sqft
(.785)(224)(224)
A circular tank has a radius of 16 ft and is 23.5 ft high at the spill point. What is the capacity of the tank in cubic feet?
A. 4,722.56 cuft
B. 35,324 cuft
C. 19,000 cuft
D. 141,300 cuft
C. 19,000 cuft
What is the depth of water in a lake if the psi is 40.7?
A. 17.6 ft
B. 94 ft
C. 72 ft
D. 36 ft
B. 94 ft
What is the chlorine dosage if 4.6 mgd is treated with 55 lb/day of chlorine?
A. 2,110 mg/L
B. 2.1 mg/L
C. 14 mg/L
D. 1.4 mg/L
D. 1.4 mg/L
Convert 5.1 MGD to cubic feet per second.
A. 54,933 cuft/sec
B. 7.9 cuft/ sec
C. 424.6 cuft/sec
D. 14.2 cuft/sec
B. 7.9 cuft/sec
5.1 x 1,000,000=5,100,000
5,100,000/7.48=681,818.182
681,818.182/1440=473.4848
473.4848/60=7.891414
What id the area of a circular reservoir if it has a diameter of 680 ft?
A. 360,000 sqft
B. 533 sqft
C. 462,400 sqft
D. 589,000 sqft
A. 360,000 sqft
(680)(680)(.785)
Calculate the volume in cubic feet for a 14" diameter pipeline that is 1,228 ft long.
A. 1,310 cuft
B. 189,000 cuft
C. 9,800 cuft
D. 3,100 cuft
A. 1,310 cuft
What is the total depth of a reservoir if the valve placed half way down from the surface shows a pressure of 62 psi?
A. 143 ft
B. 26.8 ft
C. 53 ft
D. 286.44 ft
D. 286.44 ft
Double Jeopardy!
How many pounds per day of lime are being used to treat 4.5 mgd with a dosage of 7.2 mg/L if the lime is 89% pure?
A. 270 lb/day
B. 304 lb/day
C. 240 lb/day
D. 320 lb/day
B. 304 lb/day
Convert 15 acre-ft to cubic ft.
A. 653,400 cuft
B. 21,733 cuft
C. 702,000 cuft
D. 2,904 cuft
A. 653,400 cuft
15 x 43,560
What is the diameter of a tank if the surface area is 5,200 sqft?
A. 120 ft
B. 6,624 ft
C. 81 ft
D. 56 ft
C. 81 ft
5,200/ .785=6,624
square root of 6,624= 81
Determine the volume in gallons for a pipe with a diameter of 1.5 feet and a length of 1.75 miles.
A. 23,000 gallons
B. 230 gallons
C. 119,680 gallons
D. 16,000 gallons
C . 119,680 gallons
What is the pressure at the middle of a tank that is 72 ft tall?
A. 31.17 psi
B. 15.6 psi
C. 166 psi
D. 94 psi
B. 15.6 psi
A treatment plant is treating 24.2 mgd with a 64% HTH solution. The dosage is 1.25 mg/L. If the flow rate is reduced to 17.8 mgd and the dosage is also reduced to 1.2 mg/L, how many pounds per day of HTH are needed for the new flow rate?
A. 394 lb/day
B. 161 lb/day
C. 278 lb/day
D. 114 lb/day
C. 278 lb/day
How many million gallons are there in 43,000 acre-ft?
A. 7.38 mil gal
B. 14,000 mil gal
C. 1.87 mil gal
D. 1,873 mil gal
B. 14,000 mil gal
(43,000)(43,560)(7.48) / 1,000,000
If the surface area of a rectangular drying bed is 18,125 sqft and one side measures 60 ft, what is the length of the other side?
A. 2,423 ft
B. 9,062 ft
B. 302 ft
C. 684 ft
B. 302 ft
Triple Jeopardy!
A tank is conical at the bottom and cylindrical at the top. If the diameter of the cylinder is 18ft with a depth of 32ft and the cone depth is 12 ft, what is the approximate volume of the tank in cubic feet and gallons?
A. 1,017.36 cuft / 9,200 gal
B. 9,200 cuft / 68,000 gal
C. 8,138.88 cuft/ 32,000 gal
D. Screw this problem
B. 9,200 cuft/ 68,000 gal
If the water depth in a reservoir is 13.06 ft, what is the pressure at 12 ft below the surface?
A. 2.45 lb/sqft
B. 27.72 lb/sqft
C. 750 lb/sqft
D. 5.19 lb/sqft
C. 750 lb/sqft
A plant is treating water at 72.3 mgd. If lime is being added at a rate of 1,645.94 g/min, what is the dosage?
A. 5.2 mg/L
B. 8.66 mg/L
C. 6.0 mg/L
D. 2.4 mg/L
B. 8.66 mg/L
(1,645.94)(1440)/454= 5,220.6
5220.6/ (72.3)(8.34)