What is the difference between the RECHARGE-SEEPAGE FACE BOUNDARY CONDITION package vs. the RECHARGE package?
The RECHARGE-SEEPAGE FACE BOUNDARY CONDITION package allows supplied recharge into the groundwater system if the water table is below a user specified ponding elevation. This elevation corresponds to ground elevation when there is no ponding. If the water table reaches ponding elevation, the simulation allows only as much recharge to occur as is required to maintain the prescribed ponding elevations. The rest of the recharge is shed off as surface runoff. Thus recharge to the system is reduced from prescribed levels to meet maximum ponding elevation constraints. When recharge is reduced to below zero, it indicates that water is discharging the model system under seepage conditions. When the ponding elevation is above land surface, the storage term is augmented by the additional volume of ponded water. Additionally, the RECHARGE-SEEPAGE FACE BOUNDARY CONDITION package can be used to simulate a seepage face boundary condition by prescribing the elevation of a seepage face boundary node.
