threshold : Minimumwert eines zu modellierenden Teileinzugsgebiets in Pixeln

accumulation : Ausgabedatei: Anzahl der Pixel, die durch jedes Pixel entwässern

basin : Ausgabedatei: Einheitliches Label für jedes modellierte Einzugsgebiet

r.watershed [-m4] elevation=name [depression=name] [flow=name] [disturbed.land=name] [blocking=name] [threshold=value] [max.slope.length=value] [accumulation=name] [drainage=name] [basin=name] [stream=name] [half.basin=name] [visual=name] [length.slope=name] [slope.steepness=name]

`elevation`	`Input map:`	`elevation on which entire analysis is based`
`depression`	`Input map:`	`locations of real depressions`
`flow`	`Input map:`	`amount of overland flow per cell`
`disturbed.land`	`Input map or value:`	`percent of disturbed land, for USLE`
`blocking`	`Input map:`	`terrain blocking overland surface flow, for USLE`
`threshold`	`Input value:`	`minimum size of exterior watershed basin`
`max.slope.length`	`Input value:`	`maximum length of surface flow, for USLE`
`accumulation`	`Output map:`	`number of cells that drain through each cell`
`drainage`	`Output map:`	`drainage direction`
`basin`	`Output map:`	`unique label for each watershed basin`
`stream`	`Output map:`	`stream segments`
`half.basin`	`Output map:`	`each half-basin is given a unique value`
`visual`	`Output map:`	`useful for visual display of results`
`length.slope`	`Output map:`	`slope length and steepness (LS) factor for USLE`
`slope.steepness`	`Output map:`	`slope steepness (S) factor for USLE`