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HydroCN QGIS 4 compatibility
Not QGIS 4 ready Active
Not yet — the latest version declares max QGIS version 3.99.0, so it is not offered to QGIS 4 users.
SCS Curve Number calculator: SSURGO soils + NLCD land cover fetched automatically from federal web services, with slope-resolved dual hydrologic groups, AMC adjustment, and NOAA Atlas 14 design-storm runoff.
About
Free and open source, from the maker of HydroComplete (https://hydrocomplete.com). HydroCN computes the area-weighted SCS Curve Number for a watershed or site (CONUS only) with zero manual data prep. It fetches SSURGO soil polygons and hydrologic groups (USDA SDA), NLCD 2021 land cover and imperviousness (MRLC), and a DEM (USGS 3DEP or state LiDAR) for the area of interest, resolves dual hydrologic groups (A/D, B/D, C/D) via a slope threshold, assigns TR-55 curve numbers (Good/Fair/Poor condition, or your own CSV table), and reports composite CN, per-class breakdown, mean imperviousness, and SCS runoff depths/volumes for NOAA Atlas 14 design storms. Outputs a CN polygon layer, a per-cell CN raster on the NLCD grid, and CSV/summary artifacts. Ported from the author's HydroCN Builder toolbox for ArcGIS Pro; the math and data sources are identical. Requires an internet connection.
| Author | Michael Flynn |
|---|---|
| Downloads | 211 |
| Latest version | 1.0.3 |
| Last updated | 2026-09-08 (38 days ago) |
| Min QGIS | 3.22.0 |
| Max QGIS | 3.99.0 |
| QGIS 4 ready | No |
| Maintenance | Active |
| Category | Hydrology & water |
| Tags | hydrology, curve number, scs, tr-55, nrcs, ssurgo, nlcd, runoff, stormwater, watershed, soils |
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Maintenance: Active = updated within 1 year, Quiet = 1–3 years, Likely abandoned = over 3 years.