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Irrigation Water Allocation Calculator
This calculator determines how long it will take to use up an allocation
of water.
* For surface irrigation operators, system capacities can be selected in cubic feet per second (cfs).
Example
For example (using conventional on-farm irrigation units), if a centre
pivot sprinkler is irrigating 130 acres and has an average flow rate capacity
of 900 U.S. gallons per minute (US gpm), a 300 mm (12-inch) allocation
of water would be used up after 32.7 days.
This is calculated by the formula:
T = 18.857 x D x A / Q
where :
T = allocated time of delivery (days)
D = rationed allocation depth (inches)
A = area being irrigated through the diversion (acres)
Q = average rate of flow or system capacity (U.S. gpm)
18.857 = measurement units conversion factor
For more information about this calculation, see Irrigation Water Rationing in Southern Alberta.
This information maintained by Wally Chinn
Document Last/Reviewed May 2, 2002
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