This tool measures the depth that each grid cell in an input (`dem`) raster digital elevation model (DEM) lies within a sink feature, i.e. a closed topographic depression. A sink, or depression, is a bowl-like landscape feature, which is characterized by interior drainage and groundwater recharge. The depth_in_sink tool operates by differencing a filled DEM, using the same depression filling method as fill_depressions, and the original surface model.

In addition to the names of the input DEM (`dem`) and the output raster (`output`), the user must specify whether the background value (i.e. the value assigned to grid cells that are not contained within sinks) should be set to 0.0 (`zero_background`) Without this optional parameter specified, the tool will use the NoData value as the background value.

## Reference

Antonić, O., Hatic, D., & Pernar, R. (2001). DEM-based depth in sink as an environmental estimator. Ecological Modelling, 138(1-3), 247-254.

## See Also

fill_depressions

## Function Signature

`def sink(self, dem: Raster, zero_background: bool = False) -> Raster: ...`

## Project Links

WbW Homepage User Manual Support WbW