Water-Supply Pressure Budget
Available residual at the critical fixture after elevation, meter, backflow, and friction losses, with a go/no-go verdict.
Formula and source
elevation_loss = fixture_height * 0.433; available = street_pressure - elevation_loss - meter_loss - bfp_loss - friction_loss; headroom = available - fixture_min; adequate = headroom >= 0. 0.433 psi per foot of water column.
IPC 2021 Section 604 and the ASPE Plumbing Engineering Design Handbook Vol. 2 by name; first-principles pressure budget.
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