1. Convert 20 gpm to mgd
2. Convert 60 mph to ft/second
3. Convert 6000 cf to gallons
4. Convert 120 feet of static head into psi
5. Convert 14 acres into square feet
Answers:
1. 20 gal/min X 1440 min/day = 28,800 gal/day OR 20 gal/min X 60 min/hr X 24 hr/day
(28,000 gal/day) / (1,000,000) = 0.0288 MGD
OR
(20 gal/min) / (1440 min/day) / (1 mg/1,000,000 gal) = 0.0288 MGD
2. (60 mph) / (60 min/hr) = 1 m/min
(1 m/min) / (60 sec/min) = 0.0167 mile/sec
0.0167 mile/sec X 5280 ft/mile = 88 ft/sec
OR
(60 miles/hr) / (1 hr/min) / (1 min/sec) / (5280 ft/1 mile) = 88 ft/sec
3. 6,000 cf X 7.48 gal/cuft = 44,800 gal
OR
(6,000 cuft) / (7.78 gal/1 cuft) = 44,800 gal
4. 120 ft X 0.433 psi/ft = 51.96 psi
NOTE: The column exerts 0.433 pounds per square inch of pressure. One pound per square inch (psi) of pressure can be created using a 1-in. square column of water nearly 28 inches or 2.31 feet high.
5. 14 acres X 43,560 sf/acre = 609,840 sf
NOTE: Acre is 43,560 square feet. So, if you dig 1 foot deep over an acre, you get 43,560 cubic feet of dirt.