Subterranean Garage Ramp Cloudburst Trench-Drain & Soakaway Sizer

Deterministic Rational storm peak Q = C*i_100*A + supercritical ramp sheet-flow grate capture efficiency + Manning pipe & Darcy soakaway balance engine (.pdf, .dxf, .svg, .json) built for ACO, Graf, Wavin, Hauraton — zero-upload ephemeral Wasm RAM execution.

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