Final answer:
Filling the voids around a pit liner helps prevent erosion. Adding water to a recharge area increases groundwater, while removing groundwater may cause subsidence and depletion of water resources.
Step-by-step explanation:
Filling the voids around a pit liner helps prevent the erosion that could occur without a liner. The purpose of the pit liner is to provide stability to the structure and to protect the surrounding environment by preventing unwanted movement of materials, including contaminants. Without the liner, erosion could undermine the structural integrity of the containment system, leading to leaks or collapse.
As for the effect of adding water to a recharge area, the practical effect would be an increased amount of groundwater. The action would contribute to the replenishment of the water table and enhance the sustainability of the aquifer. By contrast, when groundwater is continually removed, it may result in issues such as subsidence, cone of depression, and depletion of water resources.