swmm-gis

# 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`. Do not assume entropy mode. Do not skip the stream threshold question — it directly controls subcatchment count. Default CRS policy: if source layers already share the same projected CRS, do **not** run `normalize-layers`. The normalization bridge reprojects, clips, and may resampl...