## 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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