There are two boundary conditions in the flow model: specified heads of 1.625 m in the saturated layers in the first and last columns and infiltration of 0.1 m/day in the UZF package in the top layer of the model. Activate the CHD and UZF packages in the "Model|MODFLOW Packages and Programs" dialog box. In the UZF package, set the number of trailing waves to 15.
Screen capture of the MODFLOW Packages and Programs" dialog box with the CHD and UZF packages activated and the number of trailing waves set to 15.
