Hydrological Modelling in QGIS with Whitebox Tools
summary
Whanganui District Council uses WhiteboxTools in QGIS on 2021 1 m LiDAR to derive Overland Flow Paths and Ground Depression Areas, converting raster streams to vectors and computing flow accumulation with thresholds >5 ha, 1–5 ha, <1 ha. Depressions are breached using a least‑cost breaching algorithm (some steps take about an hour, depression extraction ~1 minute), outputs match observed river flood extents, outperform a 2013 2 m DEM product, and feed a developable‑land model and MapStore dashboard used in council planning.
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chapters (8)
- 0:00Introduction to project
- 0:48Open source GIS stack
- 2:07Environment and tools
- 3:21Processing workflow
- 6:43Visualization and styling
- 8:32Comparative analysis
- 12:44Practical applications
- 14:36Q&A session
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