Irrigation
Water Application Rate Calculators
Water Application Rate - Acres
Where H = the application rate; inches per hour
Q = flow rate; gallons per hour
K = one acre-inch of water = 27,154 gallons per acre
to get the conversion factor divide 27,154 ÷ 60 = 452.6667 (dividing an acre-inch by 60 minutes per hour)
A = area in acres
application rate inch per hour = flow rate (gallons per minute) ÷ 452.6667
area in acres
Example calculation :
water flow rate= 6 gallons per minute (gpm)
area to irrigate = 1.8 acres (ac)
6 ÷ 452.6667 ÷ 1.8 = 0.0074 inch(es) per hour
to apply 1 inch of water would require 135 minutes of irrigation time
Water Application Rate - Acres
Calculation
- flow rate (gallons per minute)
- area to irrigate (acres)
- irrigation run time the amount of time the system is running in hours
- irrigation efficiency
Results
- the application rate in inches per hour
- amount of water applied based on system run time in inches
- the application rate in millimetres per hour
- amount of water applied based on system run time in millimetres
Water Application Rate - Square Footage
Where H = the application rate; inches per hour
Q = flow rate; gallons per hour
K = one square foot-inch of water = 0.62 gallons per square foot
to get the conversion factor divide 0.62 / 60 = 0.011167 (dividing a foot-inch by 60 minutes per hour)
application rate inch per hour = flow rate (gallons per minute) ÷ 0.011167
area in square feet
Example calculation:
water flow rate= 6 gallons per minute (gpm)
area to irrigate = 600 square feet
6 / 0.011167 / 600 = 0.895 inch(es) per hour
to apply 1 inch of water would require 67 minutes of irrigation time
Water Application Rate - Square Footage
Calculation
- flow rate (gallons per minute)
- area to irrigate (acres)
- irrigation run time the amount of time the system is running in hours
- irrigation efficiency
Results
- the application rate in inches per hour
- amount of water applied based on system run time in inches
- the application rate in millimetres per hour
- amount of water applied based on system run time in millimetres
one acre = 43,560 square feet
one square foot = 144 square inches
one acre = 43,560 * 144 = 6272640 square inches
one US gallon = 0.133680555555556 cubic foot
one acre/inch of water = 27,154 US gallons
one square foot-inch of water = 0.62 US gallons
Cisterns, Tanks and Rainwater Harvesting
Water Flow Rate Calculators
Water Pressure and Friction Loss
Conversions