Water Supply Curve — SprinkFlow

Static pressure (psi)

Residual pressure (psi)

Test flow Q₁ (gpm)

Read flow at (psi)

Available flow at 20 psi

— gpm

Static (Q=0)—

Residual @ test flow—

Max flow (curve to 0 psi)—

Hazen-Williams curve: Q₂ = Q₁ × ((Ps − P₂)/(Ps − Pr))^0.54. Requires Static > Residual and a test flow.