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swmm-gis

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GIS/DEM preprocessing for SWMM experiments using the user's own QGIS/GRASS layers. Use when the user asks to (1) delineate subcatchments through QGIS/GRASS (standard or entropy-guided), (2) preprocess QGIS-derived subcatchment polygons into builder-ready CSV, (3) identify high-entropy hotspot subcatchments, or (4) expose QGIS/GRASS-backed preprocessing as MCP tools for reproducible workflows. For bbox-only inputs WITHOUT real pipe data, use `swmm-anywhere` instead (it synthesises a plausible network from OSM streets + DEM).

skills/swmm-gis/SKILL.md

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# SWMM GIS / Preprocess

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).

## Before calling any watershed delineation tool — ask the user

When the user triggers watershed delineation (`qgis_raw_to_entropy_partition` or equivalent), **always ask these questions first** before making the tool call:

1. **Delineation mode** — Standard (fast, direct GRASS basins, no entropy) or Entropy-guided (paper WJE/NWJE/WFJS split-lump with sensitivity figures)?
2. **Stream threshold** — How many upslope cells define a stream? Default 100. Smaller = more streams = finer subcatchments.
3. **If entropy mode** — Delta threshold (default 0.015) and WFJS similarity threshold (default 0.95)? Use defaults unless doing sensitivity exploration.
4. **Purpose** — Planning / calibration exploration / sensitivity analysis / paper reproduction? This affects how strictly to apply paper-only splits and whether sensitivity figures are needed.
5. **CRS normalization needed?** — Are all input layers already in the same projected CRS? If uncertain, check first with `qgis_load_layers` + `qgis_validate_crs`.