What is a key requirement for gravel-packed wells?

The requirement that gravel-packed wells must be sealed at the gravel pack top is important to ensure the integrity of the well system. Sealing the gravel pack top prevents contaminants from entering the well from surface sources and maintains the quality of water being extracted. It also helps to control the aquifer recharge rates and prevents the migration of fines into the water-bearing zones, which can compromise water quality and potentially lead to well failure.

This sealing is often accomplished using cement or other sealing materials, ensuring that the gravel pack remains stable and effective in filtering out unwanted particles while allowing water to flow into the well freely. Proper sealing is essential for long-term functionality and protection of the groundwater resource.