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River Slope Calculator QGIS 4 compatibility
QGIS 4 ready Active
Yes — River Slope Calculator supports QGIS 4 (declared max version 4.99.0).
Calculate river reach slope from a DEM using Average Slope or Equal Area Slope. Output unit selectable: m/m or %.
About
River Slope Calculator computes the slope of each river reach feature (line or multiline) from an underlying DEM raster, supporting two methods: 1. Average Slope (Mean Gradient) — The absolute elevation difference between reach endpoints divided by the total reach length. The simplest and most commonly used slope measure. 2. Equal Area Slope — The slope of a line through the outlet that creates equal areas above and below the longitudinal elevation profile. Adopted in Australian Rainfall and Runoff (ARR, 1987) for the Bransby Williams time-of-concentration formula. Reference: Ladson (2017), NZ Ministry of Works (1980). Both methods compute slope internally as dimensionless values (m/m). A new Output unit option lets you choose between m/m (dimensionless) and % (percent) — the result is multiplied by 100 when percent is selected. Slope values are added as new fields on a copy of the input reach layer. DEM elevation is sampled at a user-defined interval along each reach using trapezoidal integration for the Equal Area Slope.
| Author | Irene Jaya |
|---|---|
| Downloads | 1,720 |
| Latest version | 1.0.3 |
| Last updated | 2026-09-17 (28 days ago) |
| Min QGIS | 3.34.0 |
| Max QGIS | 4.99.0 |
| QGIS 4 ready | Yes |
| Maintenance | Active |
| Categories | Hydrology & water, Raster & terrain |
| Tags | dem, drainage, equal area slope, reach, rorb, slope, hydrology, python, river, arr, stream, flowpath |
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Maintenance: Active = updated within 1 year, Quiet = 1–3 years, Likely abandoned = over 3 years.