What is the recommended entrance velocity for well screen aperture openings?

The recommended entrance velocity for well screen aperture openings is typically identified as 0.1 feet per second. This velocity serves a critical role in ensuring that the water entering the well does so at a rate that minimizes issues such as sediment entry, clogging of the screen, and damage to aquifer materials.

The low velocity allows for effective filtration of the water as it passes through the screen, thereby reducing the likelihood of larger particles entering the well and ensuring that groundwater quality is maintained. It also helps in prolonging the lifespan of the well infrastructure by lowering the stresses on the screen material and surrounding soil layers.

Understanding this concept is essential for well contractors to properly design and install well screens that provide efficient water extraction without compromising water quality or the integrity of the aquifer.