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DDM HydroLogic QGIS 4 compatibility
QGIS 4 ready Active
Yes — DDM HydroLogic supports QGIS 4 (declared max version 4.99.0).
Delineate and create model-ready catchments interactively. Trace D8 flow paths, selects the streams that matter, drop an outlet line, and export straight to GeoPackage, RORB, WBNM, XP-RAFTS, TUFLOW or URBS.
About
Setting up a hydrologic model usually means a few hours of GIS prep work before the modelling even starts. DDM HydroLogic condenses some of the initial steps into one interactive session: it traces D8 flow paths from a DEM, ranks them by Strahler order, and lets you pick the relevant drainage. Draw an outlet line, move onto the subcatchment breakdwon window, and DDM HydroLogic cuts the catchment into dissolved subcatchment polygons — then you have choices of exporting as: GeoPackage of flow paths and subcatchments, RORB .catg GE-ready catchment file, WBNM .wbn runfile, XP-RAFTS .xpx exchange file, some of the most popular TUFLOW xxx_R.shp, or URBS .vec routing and .csv catchment files. It is important to note that all hydrological/hydraulic choices and parameters, such as rainfall, losses, Manning's coefficients, subcatchment types, etc.. have been deliberately left blank or default values. Anything the DEM can measure - sub-area areas, reach lengths and slopes - is calculated and written into the model files. Requirements and notes: QGIS 3.22 or newer, with no extra Python packages to install (it relies on the numpy and GDAL libraries already bundled with QGIS). Work for DEMs in projected CRS for meaningful areas and lengths. Licensed under the GNU General Public License version 2 or later
| Author | Davide Di Mauro |
|---|---|
| Downloads | 3,245 |
| Latest version | 2.3 |
| Last updated | 2026-09-15 (31 days ago) |
| Min QGIS | 3.22.0 |
| Max QGIS | 4.99.0 |
| QGIS 4 ready | Yes |
| Maintenance | Active |
| Category | Hydrology & water |
| Tags | strahler, tuflow, subcatchment, dem, xp-rafts, d8, catchment, wbnm, watershed, rorb, hydrology, urbs |
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