{"name": "River Slope Calculator", "package_name": "riverslopecalculator", "description": "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:\r\n\r\n1. Average Slope (Mean Gradient) \u2014 The absolute elevation difference between reach endpoints divided by the total reach length. The simplest and most commonly used slope measure.\r\n\r\n2. Equal Area Slope \u2014 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).\r\n\r\nBoth methods compute slope internally as dimensionless values (m/m). A new Output unit option lets you choose between m/m (dimensionless) and % (percent) \u2014 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.", "homepage": "https://github.com/irenejaya/slope-calculator", "repository": "https://github.com/irenejaya/slope-calculator", "tracker": "https://github.com/irenejaya/slope-calculator/issues", "author": "Irene Jaya", "tags": ["python", "hydrology", "dem", "slope", "river", "drainage", "arr", "reach", "rorb", "equal area slope"], "downloads": 608, "latest_version": "1.0.2", "versions": [{"version": "1.0.2", "experimental": false, "qgis_min": "3.34.0", "qgis_max": "4.99.0", "downloads": 497, "uploaded_by": "irenejaya", "upload_datetime": "2026-05-25T05:39:11.558288"}, {"version": "1.0.0", "experimental": true, "qgis_min": "3.34.0", "qgis_max": "4.99.0", "downloads": 111, "uploaded_by": "irenejaya", "upload_datetime": "2026-05-23T01:34:28.505156"}]}