Water Supply Curve — SprinkFlow

Flow test

Static pressure (psi)

Residual pressure (psi)

Test flow Q₁ (gpm)

Read flow at (psi)

System demand (optional)

Demand flow (gpm)

Demand pressure (psi)

Outside hose flow (gpm)

Available flow at 20 psi

— gpm

Enter a system demand to check it against the supply.

Static (Q=0)—

Residual @ test flow—

Max flow (curve to 0 psi)—

Hazen-Williams curve: Q₂ = Q₁ × ((Ps − P₂)/(Ps − Pr))^0.54. Enter a system demand (flow + pressure) to plot it; the outside hose flow is added horizontally from the demand point as a dashed line. The point must fall under the supply curve.