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Welcome to your Water Math Exam

1. How many feet of head would create a pressure of 130 psi?
2. What would the psi at an outlet at elevation of 419 ft?
3. Pump runs 18 hours and pumps 120,000 gallons what is gpm pumping rate?
4. How much would 150 gallons of water weigh?
5. What is detention time in minutes of 20 ft diameter tank 16 ft deep with flow of 1.5 MGD?
6. How much force on 6" blind flange with 65 psi?
7. What would be the maximum pumping rate of a 30 hp pump with 100 ft of head?
8. City spends \$166,000 per year and sells 750 MG, what is cost per 1,000 gallons?
9. How many gallons in an 80 ft diameter tank filled 20 ft?
10. How many gallons of water in an 18 inch pipe that is 5,500 ft long?
11. How long will a 10,000 gallon tank flow at 250 gpm?
12. How many gallons in a rectangular tank 5 ft x 8 ft x 5 ft?
13. How many hours would it take to fill a 90 ft dia. tank 40 feet high pumping 2,400 gpm?
14. How many pounds of 65% HTH would be needed to dose 300,000 gal. at 250 mg/L?
15. How many pounds of 65% HTH would be needed to dose 3,500 ft of 12 inch pipe to 50 mg/L?
16. What would be the cost per day to chlorinate 4 MG at 1.5 mg/L if chlorine cost 20 cents per pound?
17. A leak of 1 pint every 1.5 min. would leak how many gallons in 30 days?
18. What is the pumping rate in gpm if the pump drains 2' out of a 25' x 35' basin in 1 hr.?
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