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swmm-runner

Run EPA SWMM (swmm5) simulations reproducibly and extract key metrics from the report file. Use when an agent needs to (1) run a .inp via swmm5 CLI, (2) generate a run directory with rpt/out + manifest, (3) extract peak flow/time for a node/outfall, (4) parse SWMM continuity (Runoff Quantity / Flow Routing) errors from .rpt, or (5) compare two .rpt files (e.g. GUI vs CLI) for equivalence.

skills/swmm-runner/SKILL.md

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Oct 28, 2026
License
MIT

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# SWMM Runner (CLI-first)

Part of [Agentic SWMM](https://github.com/Zhonghao1995/agentic-swmm-workflow) — install the project first for the executable toolchain (aiswmm CLI, SWMM solver, MCP servers).

## What this skill provides

- Deterministic execution wrapper around the `swmm5` binary.
- A standard **run directory** layout: `inp/`, `rpt/`, `out/`, `stdout`, `stderr`, `manifest.json`.
- Metric extraction read directly from SWMM's own `.rpt`:
  - peak flow + time-of-peak for any junction or outfall;
  - Runoff Quantity and Flow Routing continuity tables + continuity error %;
  - cross-run comparison (e.g. GUI vs CLI) on continuity error.

## When to use this skill