Select a Calculator
These irrigation calculators will help compute your irrigation needs based on your growing practices, types of soil, and vegetation.
Drip Calculators
- Drip Line Rate: Application rate of drip lines.
Sprinkler Calculators
- Sprinkler Application Rate: Sprinkler application rate based on nozzle diameter and spacing.
- Hand Move Sprinklers: Find recommended values for hand move sprinklers, such as set times, nozzles and pressure losses.
- Nozzle Requirements: Find the flow rate using a given pressure and diameter, or find the nozzle diameter for a given pressure and flow rate.
- Traveling Big Gun Sprinkler: Calculate the net water application for a given flow rate, efficiency percentage, lane width, and travel speed.
- Sprinkler Discharge Rate: Learn how to estimate a single sprinkler's discharge rate by setting up an experiment using two sprinklers, 4 cans and a measuring container.
Center Pivot Calculators
- Center Pivot Acreage: Calculate the area underneath a center pivot.
- Pivot Full Rotation Time: The time that it takes for a 360 degree rotation of a center pivot.
- Percentage Timer Setting: Use this calculator to calculate an approximate timer setting to apply a particular depth.
- 1" Application Time: Calculate the irrigation time to apply one inch of water with a center pivot.
- System Pumping Requirements: Calculate the system capacity (flow rate) required to meet the demands of a field.
Chemigation Calculators
- Chemical Injection Rate (Volume): Calculate the injection rate based on the volume per area.
- Chemical Injection Rate (Mass): Calculate the injection rate based on the weight per area.
- Chemical Injection Rate (Water Chemistry Control): Calculate the the injection rate for water chemical solutions.
- Mixing Dry Chemicals: Calculate how much dry chemical to mix with water, depending on your water requirements.
- Batch/Bulk Application: Calculates the chemical injection rate for batch or bulk chemical applications.
- Maximum Solution Concentration: Find the solution concentration in the irrigation lines for a given chemical injection rate and water flow rate.
General Calculators
- Pipeline Pressure Loss with Outlets: Calculate the pressure loss in a pipe with evenly spaced outlets, such as a sprinkler lateral or a manifold, or minimum pipe size in the same based on the maximum allowable pressure loss.
- Friction Loss: Pressure loss in pipes from friction.
- Required System Capacity: Calculate the system flow rate capacity required to meet crop water needs.
- Water Application Rate: Water application rate from a given flow and area.
- Required Water Pump Horsepower: Calculate the horsepower requirements for a pump.
- Required Flow Rate: Flow rate required to meet crop water demands for an area.
- Pipe Velocity and Diameter: Many designers design pipe sizes based on velocity limits (5 fps). Calculate the pipe diameter and the water velocity in the pipe.
- Water Depth: Calculate application depth given flow, land area, and time.
- Set Times: Calculate the set time for irrigating based on application and flow rate.
Residential Calculators
- Drip Design for Landscapes: Determine how much water to apply to individual plants with drip emitters.
- Garden Hose Flow Rate: Calculate the flow rate and application time for a garden hose, based on hose size and supply pressure.
- Lawn Water Management: Find the application depth and operation time for a specific grass type, precipitation rate, and daily water use. Also provides suggested application depths and operation times for multiple water periods.
- Tree Water Management: Find a watering period and water quantity for a tree type, tree spread diameter, and daily water use. The results give a suggested water management schedule for watering periods and a corresponding water quantity.
Water Measurement Calculators
- Flow over Trapezoidal Weir: Calculate flow rate over a trapezoidal (Cipolletti) weir.
