Method — Screening-level estimate
Fixture units are a sizing index, and pipe runs are per-floor rule-of-thumb lengths. This is NOT a hydraulic network, pressure or drainage-gradient design.
Every result below is produced by the same engineering engine that feeds the High-Rise reference project, so a quantity taken from this page and a quantity taken from the workflow cannot disagree.
Governing Formula
Governing Formula
FU_total = n x FU_per_unit Where:
-
n= Number of dwellings -
FU= Fixture units per dwelling
Derived Equations:
Cold water pipe run:
L_cw = floors x run_per_floor Hot water pipe run:
L_hw = floors x run_per_floor Drainage pipe run:
L_drain = floors x run_per_floor Assumptions & Limitations
- Pipe sizes are not derived - no velocity, head-loss or fill-rate check.
- No hot-water generation, no storage volume, no pump or booster set.
- No external stormwater; use the Fire Water & Egress and Site Infrastructure calculators where applicable.