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ProCrop |
The Water Primer
Water Equivalents Reference Tables
| Volume Conversions | |||||
| Unit | Cubic Inches | Cubic Feet | Gallons | Acre-Feet | Million Galls |
| 1 cubic in | 1 | .00579 | .00433 | .00000001218 | .000000004329 |
| 1 cubic ft | 1728 | 1 | 7.48 | .00002296 | .00000748 |
| 1 U.S. gallon | 231 | .134 | 1 | .000003069 | .000001 |
| 1 acre-ft* | 75,270,000 | 43,560 | 326,000 | 1 | .3260 |
| 1 million galls | 231,000,000 | 133,800 | 1,000,000 | 3.0684 | 1 |
* An acre-foot covers the area of one acre one foot deep.
| Rate of Flow Conversions | |||
| Unit | Cubic Feet Per Second | Cubic Feet Per Day | Acre-Feet Per Day |
| 1 cubic foot/second | 1 | 86,400 | 1.984 |
| 1 cubic foot/day | .000016 | 1 | .00023 |
| 1 acre-foot/day | .5042 | 43,560 | 1 |
| 1 gallon/minute | .00223 | 192.5 | .00442 |
| 1 gallon/day | .00000155 | 11,337 | .00000307 |
| 1 million gallon/day | 1.55 | 133.700 | 3.07 |
| Unit | Gallons Per Minute | Gallons Per Day | Million Gallons Per Day |
| 1 cubic foot/second | 448.8 | 646,000 | .646 |
| 1 cubic foot/day | .00519 | 7.48 | .00000748 |
| 1 acre-foot/day | 226.28 | 325,900 | .3258 |
| 1 gallon/minute | 1 | 1440 | .00144 |
| 1 gallon/day | .000694 | 1 | .00001 |
| 1 million gallon/day | 694 | 1,000,000 | 1 |
For example, water flowing at the steady rate of 1 cubic foot per second (cfs) is equivalent to: 86,400 cubic feet per day; 1.98 acre-feet; 449 gallons per minute; or 646,000 gallons of water per day.
Weight Conversions
1 gallon = 8.3 pounds
1 cubic foot = 62.4 pounds
1 acre-foot = 2.7 million pounds or 1,359
The weight of one inch of rain over 1 acre of land would tip the scale at about 226,512
pounds or 113 tons. An inch of rain over the conterminous United States is equivalent to
about 47.7 cubic miles of water and would weigh about 22 million tons.
Metric units
1 liter = 1,000 milliliters = 0.001 cubic meters
1 liter per second flow = 86.4 cubic meters per day
1 liter of pure water weighs 1 kilogram
1 milliliter of water weighs 1 gram
The following equivalencies will allow you to convert from metric units to U.S. units:
1 liter = 0.264 gallons or 0.0535 cubic feet and 1 kilogram = 2.2 pounds
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