# Irrigation Pressure Calculator, Formula, Irrigation Pressure Calculation

## Irrigation Pressure Calculator:

Enter the values of frictional pressure loss, FP(psi), static pressure, SP(psi) and elevation pressure gain, EP(psi) to determine the value of Irrigation pressure, Ir(psi).

 Enter Static Pressure: psi Enter Frictional Pressure Loss: psi Enter Elevation Pressure Gain: psi Result – Irrigation Pressure: psi

## Irrigation Pressure Formula:

Irrigation pressure refers to the pressure needed to deliver water effectively and efficiently through an irrigation system. Irrigation pressure is crucial for ensuring that water reaches all areas of the field uniformly, thereby maintaining optimal growth conditions for crops.

It directly influences the velocity and distribution pattern of water from emitters, sprinklers, or drippers. Insufficient pressure can lead to uneven water distribution, which may result in under-watering or over-watering certain areas.

Conversely, excessive pressure might damage the system or cause water wastage through misting or runoff.

Static pressure is the initial pressure of the water source, which is often the pressure in the water tank or well.

Friction Pressure Loss:As water flows through pipes and fittings, friction causes a pressure drop.

Elevation Pressure: If the irrigation system involves changes in elevation, this term accounts for the pressure gain or loss due to gravity.

Irrigation pressure, Ir(psi) in pounds per square inches is calculated by subtracting the frictional pressure loss, FP(psi) in pounds per square inches from the static pressure, SP(psi) in pounds per square inches and then adding the elevation pressure gain, EP(psi) in pounds per square inches.

Irrigation pressure, Ir(psi) = SP(psi) – FP(psi) + EP(psi)

Ir(psi) = irrigation pressure in pounds per square inches, psi.

SP(psi) = static pressure in pounds per square inches, psi.

FP(psi) = frictional pressure loss in pounds per square inches, psi.

EP(psi) = elevation pressure gain in pounds per square inches, psi.

### Irrigation Pressure Calculation:

1. A farm irrigation system uses a water source with a static pressure of 60 psi. The system experiences a frictional pressure loss of 15 psi due to piping and fittings, and there’s an elevation gain of 10 psi. Calculate the irrigation pressure.
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Given: SP(psi) = 60psi, FP(psi) = 15psi, EP(psi) = 10psi.

Irrigation pressure, Ir(psi) = SP(psi) – FP(psi) + EP(psi)

Ir(psi) = 60 – 15 + 10

Ir(psi) = 55psi.

1. An irrigation system requires an irrigation pressure of 40 psi to operate efficiently. The frictional pressure loss in the system is 12 psi, and there’s an elevation loss of 5 psi. Find the static pressure (SP) at the water source.

Given: Ir(psi) = 40psi, FP(psi) = 12psi, EP(psi) = -5psi.

Irrigation pressure, Ir(psi) = SP(psi) – FP(psi) + EP(psi)

SP(psi) = Ir(psi) + FP(psi) – EP(psi)

SP(psi) = 40 + 12 – (-5)

SP(psi) = 57psi.