Fill Sinks (Wang & Liu)
ta_preprocessor
QgsProcessingParameterRasterLayer|ELEV|DEM|None|False
QgsProcessingParameterNumber|MINSLOPE|Minimum Slope [Degree]|QgsProcessingParameterNumber.Double|0.01|False|0.0|None
QgsProcessingParameterRasterDestination|FILLED|Filled DEM
QgsProcessingParameterRasterDestination|FDIR|Flow Directions
QgsProcessingParameterRasterDestination|WSHED|Watershed Basins