Design Blueprint: Municipal Leak-Location Logger Network — Build Specification Derived from the Pressure-Transient Timing Paper

DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. A complete build specification for a municipal leak-location logger network that locates leaks in plastic-pipe distribution networks by pressure-transient timing, derived from the source paper: https://doi.org/10.5281/zenodo.24108543. Design basis: low-cost pressure loggers at 250 m spacing sampling at 10 Hz with clocks disciplined to a 10.0 ms timing-noise floor and 0.01 bar pressure noise; wave speed 309.3 m/s in polyethylene against 1258.9 m/s in ductile iron (ratio 4.07), giving a standard location error of 6.7 m in polyethylene against 27.2 m in iron; wave speed calibrated in place between the loggers, reducing the systematic offset at 250 m spacing from 25.0 m uncalibrated to 2.1 m; detection floor of 3.08 mm equivalent hole at 250 m in a 200.0 mm main. Reference deployment: 50 km of mains in a 5,000-person town, 201 loggers, $6,030 hardware at a $30 design-target unit cost ($1.21 per person), with a scaling rule for other network lengths. The blueprint gives the system layout, a bill of materials in generic specification classes, an installation and commissioning sequence centred on clock synchronisation, the operating envelope including where acoustic correlation remains better, tolerances and critical fits tied to the source figures, failure modes and mitigations, a maintenance schedule derived from the sampling figures, and the measurements a first deployment must make. Nothing has been built or measured; every derived quantity is reproducible from the accompanying compute.py.