---
name: "topic_hydrology"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "8.4.1-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/topic_hydrology"
---

# topic\_hydrology(1grass)

## Topic: hydrology

| | | |
| --- | --- | --- |
| r.basins.fill |  | Generates watershed subbasins raster map. |
| r.carve |  | Generates stream channels. |
| r.drain |  | Traces a flow through an elevation model or cost surface on a raster map. |
| r.fill.dir |  | Filters and generates a depressionless elevation map and a flow direction map from a given elevation raster map. |
| r.flow |  | Constructs flowlines. |
| r.lake |  | Fills lake at given point to given level. |
| r.path |  | Traces paths from starting points following input directions. |
| r.sim.sediment |  | Sediment transport and erosion/deposition simulation using path sampling method (SIMWE). |
| r.sim.water |  | Overland flow hydrologic simulation using path sampling method (SIMWE). |
| r.solute.transport |  | Numerical calculation program for transient, confined and unconfined solute transport in two dimensions |
| r.stream.extract |  | Performs stream network extraction. |
| r.terraflow |  | Performs flow computation for massive grids. |
| r.topidx |  | Creates a topographic index (wetness index) raster map from an elevation raster map. |
| r.topmodel |  | Simulates TOPMODEL which is a physically based hydrologic model. |
| r.uslek |  | Computes USLE Soil Erodibility Factor (K). |
| r.usler |  | Computes USLE R factor, Rainfall erosivity index. |
| r.water.outlet |  | Creates watershed basins from a drainage direction map. |
| r.watershed |  | Calculates hydrological parameters and RUSLE factors. |
| r3.flow |  | Computes 3D flow lines and 3D flow accumulation. |

*See also the corresponding keyword hydrology for additional references.*

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