Basic units of water measurement

There are two basic units of water measurement from a water management perspective.  For water that is in motion, cubic feet per second (cfs) is the unit of measure.  For water that is stored or impounded, the acre-foot (af) is how water is measured.

Cubic feet per second (cfs):
 * 1 cubic foot = 7.4805 gallons.
 * 1 cubic foot per second = 7.4805 gallons flowing by a particular point in 1 second.
 * 1 cfs = 1.983 acre-feet per day = 646,320 gallons = 2447 cubic meters of water.
 * 1 cfs is equivalent to 448.8 gallons of water flowing per minute.
 * 1 cfs will produce 724 acre-feet of water per year.
 * 1 cfs = 38.4 miner’s inches of water.

Acre-foot (af):
 * 1 acre = 43,560 square feet.
 * 1 acre-foot = 43,560 cubic feet.
 * 1 acre-foot = 325,851 gallons of water = 1233 cubic meters of water.
 * 1 acre-foot = 0.504 cfs/ day.

Other conversions:
 * 1 US gallon = 0.1337 cubic feet = 3.79 liters.
 * 1 Million gallons = 3.07 acre-feet = 1.547 cfs per day.
 * 1 gallon of water weighs 8.33 lbs.
 * 1 cubic foot of water weighs 62.4 lbs.
 * 1 part per million = 1 milligram per litre = 8.35 lbs per million gallons.
 * 1 square mile = 640 acres.
 * 1 million gallons per day = 694.4 gallons per minute.

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