Irrigation Pipe Calculator — Calculate Water Flow & Pipe Capacity

Irrigation Pipe Calculator

Calculate water flow rates, pressure drop, and pipe capacity for irrigation systems. Determine optimal pipe sizing for agricultural and garden irrigation.

Step 1: Pipe Specifications

2″
100 ft

Understanding Pipe Materials

Different pipe materials have varying roughness coefficients that affect water flow. Smooth pipes like PVC have lower friction, allowing higher flow rates with less pressure loss.

Step 2: Flow Conditions

20 GPM
40 PSI

About Pressure Drop

Pressure drop increases with pipe length, flow rate, and pipe roughness. Higher temperatures reduce water viscosity, slightly decreasing pressure loss. Choose appropriate pipe size to maintain adequate pressure at irrigation points.

Irrigation Pipe Analysis Results

Summary
Material Comparison
Breakdown

Pressure Drop

3.2 PSI
Based on 2″ PVC pipe, 100 ft length, 20 GPM flow
Flow Velocity
2.3 ft/s
Output Pressure
36.8 PSI
Reynolds Number
12,450
Friction Factor
0.021

Pipe Material Comparison

Pipe Material Roughness Pressure Drop Flow Velocity

Pressure Drop Analysis

Darcy-Weisbach Equation

Pressure Drop = f × (L/D) × (ρ × v² / 2)

Where: f = friction factor, L = pipe length, D = pipe diameter, ρ = water density, v = flow velocity. This calculator uses the Colebrook-White equation to determine friction factor for turbulent flow.

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