Math Problems

Question 1

What is the capacity in gallons of a clarifier 20 ft long, 18 ft high, and 10 ft wide?

Answer 1

26,928 gallons

Question 2

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?

Answer 2

45,441 gallons

Question 3

What is the volume of a round storage tank in gallons that is 30 ft tall and 20 ft in diameter?

Answer 3

70461.6 gallons

Question 4

A pump produces 300 gallons per minute. What is the flow in MGD?

Answer 4

.432174 MGD

Question 5

A water treatment plant produces 1200 gallons per minute of finished water. What is the flow in MGD?

Answer 5

1.72 MGD

Question 6

Determine the CI2 setting in pounds to treat a flow of 2 MGD with CI2 dose of 3.0 mg/l.

Answer 6

50 lbs

Question 7

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?

Answer 7

6lbs

Question 8

Calculate the alum dose rate in mg/l with a flow of 1.8 MGD and feeding 135 lbs/day of alum.

Answer 8

9 mg/l

Question 9

Calculate the CI dose rate in mg/l with a flow of 1,500,000 gallons per day feeting 120 lbs of CI2

Answer 9

9.5 mg/l

Question 10

Determine the flow in a plant if you are feeding 150 pounds of CI2 at 3 mg/l dosage.

Answer 10

6 MGD

Question 11

Determine the flow of a plant in MGD that is dosing alum at 2 mg/l while feeding 115 lbs of alum.

Answer 11

6.9 MGD

Question 12

Calculate the number of pounds of 64% HTH needed to dose at 3 mg/l while feeding 115 lbs of alum.

Answer 12

58.6 lbs

Question 13

Calculate the number of gallons of 12.5% sodium hypochorite needed with a flow of .5 MGD with a dose of 2 mg/l

Answer 13

66.7 lbs

Question 14

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?

Answer 14

9 CFS

Question 15

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?

Answer 15

18 CFS

Question 16

Flow in 8” pipe is 500 gallons per minute. What is the velocity in ft/sec?

Answer 16

3.14 ft/sec

Question 17

Flow in 6” pipe is 250 GPM. What is the velocity in ft/sec?

Answer 17

2.8 ft/sec

Question 18

What would the static pressure at the bottom of a standpipe filled to the 85 ft level?

Answer 18

37 psi

Question 19

What would be the static pressure of a tank 120 ft high with a maximum fill level of 115 ft?

Answer 19

49.7 psi

Question 20

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?

Answer 20

15.8 psi

Question 21

You have a standpipe filled to the top, with a static pressure at the bottom of 40 psi. How tall is the standpipe?

Answer 21

92 ft

Question 22

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.

Answer 22

68.8 psi