r.drain r.drain - Traces a flow through an elevation model on a raster map. Raster (r.*) ParameterRaster|input|Name of elevation raster map|False ParameterString|coordinate|Map coordinates of starting point(s) (E,N)| ParameterMultipleInput|vector_points|Name of vector map(s) containing starting point(s)|0.0|False ParameterBoolean|-c|Copy input cell values on output|False ParameterBoolean|-a|Accumulate input values along the path|False ParameterBoolean|-n|Count cell numbers along the path|False OutputRaster|output|Name for output raster map