When selecting a screen for a monitoring well, which factor is NOT typically considered?

When selecting a screen for a monitoring well, which factor is NOT typically considered?

• A. Type of well head seal
• B. Screen slot size
• C. Formation permeability
• D. Screen length

Answer: (A)

When choosing a screen for a monitoring well, the guiding idea is to let groundwater enter the well while keeping formation particles out. This involves how large the screen openings are (slot size) so fines don’t clog the screen yet water can flow, how permeable the formation is so you know how easily water moves into the screen and how long the screen should be to access enough of the aquifer (screen length) to minimize drawdown, and how much open area the screen provides. The type of well head seal at the surface isn’t part of that hydraulic or filtration consideration; it’s a surface sealing feature rather than something that affects how the screen interacts with the aquifer. So, the type of well head seal is not typically a factor in selecting the screen itself.

When choosing a screen for a monitoring well, the guiding idea is to let groundwater enter the well while keeping formation particles out. This involves how large the screen openings are (slot size) so fines don’t clog the screen yet water can flow, how permeable the formation is so you know how easily water moves into the screen and how long the screen should be to access enough of the aquifer (screen length) to minimize drawdown, and how much open area the screen provides. The type of well head seal at the surface isn’t part of that hydraulic or filtration consideration; it’s a surface sealing feature rather than something that affects how the screen interacts with the aquifer. So, the type of well head seal is not typically a factor in selecting the screen itself.