Section 01 · Spatial & Fluid Dynamics
The Plumber
Every drain line is a geometry problem solved against gravity. Pick a lab — slope, offset, DFU, pressure, or pipe sizing.
Water Pressure Drop Calculator
Residual = Static − (Elevation × 0.433) − Friction
Each foot of vertical lift costs 0.433 PSI. IPC §604.6 requires ≥ 20 PSI residual at the most remote fixture.
Elev loss
8.7 PSI
Friction
8 PSI
Residual
43.3
Meets 20 PSI minimum