What is it?
Two options are available for controlling flux into/out of the aquifer system through/at the near land surface:- the first restricts the input of recharge in areas where the hydraulic conductivity (K=Kxx) is less than an assigned threshold value. This helps to account for low permeability soils and/or land covers that are virtually a barrier for infiltration of precipitation.
- the second deals with exchange of water between surface water (streams or lakes) and the aquifer system - fluxes can be computed both horizontally and vertically if the stream/lake geometry is known or can be approximated; or fluxes can just be computed vertically from the top-layer model cells.
How to use it:
RECHARGE RESTRICTION. Enter a non-zero, positive value for the threshold K value. By default, this feature is turned off (i.e., the default threshold value is zero).RIVER FLUX. Check the box next to 'Treat River Flux as ...' to compute the flux as a vertical exchange between surface water and the groundwater model cells. By default, both horizontal and vertical fluxes will be computed (if surface water geometry is known and the vertical model resolution is sufficient)