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Well Points No Longer Recommended

Wells in wetlands should now have a maximum length of 15 inches. Impermeable layer, confining layer, and good soil profile description are necessary. Piezometers are installed below confining layers for accurate readings. Artesian conditions, perched water tables, and ground water flow must be taken into account.

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Well Points No Longer Recommended

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  1. Well Points no longer recommended, leave bottom open. 15” max. length now recommended for wells in wetlands.

  2. Impermeable layer

  3. Monitoring wells do not penetrate a confining layer. Piezometers by definition have perforated interval installed below a confining layer. No confining layer, no piezometer. Always need a good soil profile description.

  4. Monitoring well penetrates a confining layer. Erroneous readings will result.Piezometer’s perforated interval installed below a confining layer. Correct reading on piezometric head in lower layer. Artesian condition in piezometer. Does not read perched water table.

  5. Perched Artesian, confined aquifer Ground water flow - Monitoring wells used in water table aquifers. Open to atmosphere.- Piezometers are installed in confined aquifers. Artesian if water level rises above confining layer, flowing artesian is water comes to soil surface. Water flows from higher to lower piezometric head.

  6. Correct Incorrect

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