fix parameter name: khfrac to ksathorfrac

docs/src/user_guide/model-setup.md

@@ -56,8 +56,8 @@ the SBM + Kinematic wave model includes the lateral component [Subsurface flow
 routing](@ref) and parameters that are part of this component are described in the [Lateral
 subsurface flow](@ref) section of Model parameters. Input parameters for this component of
 the SBM + Kinematic wave model are derived from the SBM vertical concept and the land slope.
-One external parameter `khfrac` is used to calculate the horizontal hydraulic conductivity
-at the soil surface `kh₀`.
+One external parameter `ksathorfrac` is used to calculate the horizontal hydraulic
+conductivity at the soil surface `kh₀`.
 
 There is also the option to use the local inertial model as part of the `sbm` model type:
 + for river flow, see also  [SBM + Local inertial river](@ref) model.