Total Dynamic Head (TDH) Calculator

Compute the required pump head for your farm irrigation system. Add static elevation, operating pressure, and friction loss to get TDH in meters.

Static Elevation (m)Vertical lift from water surface to discharge

Operating Pressure (PSI)Required at sprinkler / drip emitter

Suction Line Friction (m)Pipe + fittings on suction side

Discharge Friction (m)Pipe + fittings on discharge side

Formula: TDH = Static Elevation + (PSI × 0.703) + Suction Friction + Discharge Friction

1 PSI ≈ 0.703 m head (water, SG=1.0). For sediment-laden or saline water, correct for specific gravity. Suction friction at 5 m/s velocity in 50 mm pipe ≈ 0.08 m per meter of pipe — refer to ANSI/HI 14.6 or a Moody chart for precise values.