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.

Drop = Run × Pitch. Self-scouring flow check.

Pythagoras for the diagonal pipe run.

IPC §709 fixture units → drain size.

Static − elevation − friction = residual PSI.

WSFU → service size (Hunter's curve).