SWMM5 Engine Harness

Load an .inp, tweak the knobs that drive stability, and re-run the real EPA SWMM 5.2.2 engine in your browser — watch continuity error, the flow-depth phase portrait, and a parameter sensitivity sweep respond to the same numbers.

Loading the SWMM5 engine (~750 KB, one-time)…
No model loaded.
Drop .inp (+ .rpt/.out) here

Continuity

Load a model to see continuity

Phase space

Rising limb (current run) Falling limb (current run) Original baseline

Sensitivity sweep

Vary one parameter across a range, re-running the engine at each step, and see how a chosen metric responds — holding every other current parameter fixed.

from to in steps, tracking
Compare across models (optional) \u2014 add other .inp files to overlay the same sweep on each:
or drop .inp files here