National Groundwater Association (NGWA) Practice Exam

Question: 1 / 400

What is the recommended size for a well screen in relation to the sand or gravel?

Equal in size to the sand or gravel

Significantly larger than the sand or gravel

Somewhat smaller than the sand or gravel

The recommended size for a well screen in relation to the sand or gravel is somewhat smaller than the sand or gravel. This sizing is crucial to ensure effective filtration while preventing sand or gravel particles from entering the well. When the screen is slightly smaller than the particles of the surrounding material, it allows groundwater to flow through while capturing or blocking larger particles that could cause clogging or damage to the well infrastructure.

This sizing approach also helps maintain the hydraulic conductivity of the aquifer while ensuring that the well is protected from sediment buildup. It balances the need for water intake efficiency with the necessity of maintaining the structural integrity of the well and the surrounding environment. By choosing a screen that is somewhat smaller than the sand or gravel, well installers can optimize performance and longevity, leading to better overall groundwater management.

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Much smaller than the diameter of the well

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