The model has a uniform recharge rate of 3e-8 ft/s. On the top view of the model with the top layer selected, create a Rectangle object that completely surrounds the grid. In the Object Properties dialog box, switch to the MODFLOW Features tab and check the check box for the RCH package. Enter a Starting time of 0, an Ending time of 86400 and a Recharge rate of 3E-8. Click OK to close the dialog box.
