This article talks about some of the more commonly requested groundwater analysis applications.

How can I model a well that pumps water out of a system?
This can be modeled using a negative nodal flow boundary condition or negative infiltration.

How do I model aquifer storage in Slide?
The storage quantity can be calculated based on other input terms from slide (mw and the water content curve). The slope of the water content curve that Slide requires in the transient analysis is mw (coefficient of volume change).
Aquifer storage is shown in Verification Example #21.
Comparison of Slide results and Analytical Solution for Transient Seepage through Fully Confined Aquifer with no initial porewater distribution

How can I model an excavated boundary condition in Slide?
Modeling an excavated boundary condition in Slide is complex. The example shown below was done using transient boundary conditions that consider changes of total head with time and applied them on different elevation levels. The changes of total head followed the 1m interval of the excavation steps in the example. The Slide file is attached to this article.
Example of excavated boundary condition in Slide