What is it?
Groundwater recharge is defined as the entry of water into the saturated zone at the water-table surface.Source: Freeze, R. A., & Cherry, J. A.. 1979. Groundwater. Englewood Cliffs, New Jersey: Prentice-Hall, Inc.
In IGW-NET, water may be added to the aquifer through the top boundary as recharge (precipitation/surface water that infiltrates down to the water table).
How to use it:
Check the radio box next to ‘Recharge:’ and enter a non-zero value (units: inch/year) in the text box to the right of ‘Recharge:’ to apply a prescribed recharge for all model cells over which the zone extends. This value is steady (i.e., the same value will be applied for all time-steps if performing transient simulations). To assign time-varying recharge, check the radio box next to the ‘Transient’ button, and then LM click the ‘Transient button. This opens the ‘Transient Data for Recharge’ sub-menuEnter a non-zero value (units: inch/year) in the text box next to ‘Conc:’ to apply a prescribed source concentration (units: ppm) for all model cells over which the zone extends. This value is steady (i.e., the same value will be applied for all time-steps if performing transient simulations). To assign time-varying source concentration, check the radio box next to the ‘Transient’ button, and then LM click the ‘Transient button. This opens the ‘Transient Data for Recharge Concentration’ sub-menu.