Surface, Gradient and Concentration sim_hydrology QgsProcessingParameterRasterLayer|MASK|Mask|None|False OutputRaster|SURF|Surface OutputRaster|GRAD|Gradient OutputRaster|CONC|Concentration ParameterNumber|SURF_E|Surface Approximation Threshold| 0.000000|None| 0.001000 ParameterNumber|CONC_IN|Inlet Concentration| 0.000000|None| 5.000000 ParameterNumber|CONC_OUT|Outlet Concentration| 0.000000|None| 3.000000 ParameterNumber|CONC_E|Concentration Approximation Threshold| 0.000000|None| 0.001000 ParameterNumber|GRAD_MIN|Minimum Gradient| 0.000000|None| 0.000000 ParameterSelection|NEIGHBOURS|Neighbourhood|[0] Moore (8);[1] Neumann (4);[2] Optimised| 0