This tool can be used to find cells with undefined flow, i.e. no valid flow direction, based on the D8 flow direction algorithm (d8_pointer). These cells are therefore either at the bottom of a topographic depression or in the interior of a flat area. In a digital elevation model (DEM) that has been pre-processed to remove all depressions and flat areas (breach_depressions_least_cost), this condition will only occur along the edges of the grid, otherwise no-flow grid cells can be situation in the interior. The user must specify the name (`dem`) of the DEM.

## See Also

d8_pointer, breach_depressions_least_cost

## Function Signature

`def find_noflow_cells(self, dem: Raster) -> Raster: ...`

## Project Links

WbW Homepage User Manual Support WbW