Real time-varying data can be entered from actual observed records. The software automatically accepts different time bases and calculates intermediate values. Any number of pumping wells with their own different time-varying abstraction record can be input at the start of the run eliminating the need to worry about different stress periods. Multiple infiltration areas can be defined, each with their own time-varying infiltration record. The areal recharge can be varied according to geological outcrop or topographical controls.
Infiltration enters into the uppermost layer.
Rivers or estuaries can be simulated in three different ways. An average head condition can be specified with leakage into or out of the aquifer depending on the surrounding aquifer head. An intermittent leakage condition can be defined so that when groundwater level falls below the bed of the river, leakage can cease or become constant. A variable head condition can be defined for each river node where the hydraulic head varies according to a known analytical function or according to real river water level hydrograph data. The time-varying hydrograph data can be entered at whatever time interval is desired.