Wells: Part 1

Did you know that Parkwood inspects wells? One of the major components of a well inspection is testing the well water quality. If you have a property with a well, it is important to test your well water once per year at minimum.

There are three common well types: Dug, bored, and Drilled Wells. This week we will discuss dug and bored wells and save the most common type, the drilled well, for next week.

Dug Wells:

Dug wells are typically shallow and rarely more than 30 feet. Their diameter can be 2-3 feet, and they may be lined with brick or stone in old construction. Modern dug wells typically have precast concrete casings. These wells are vulnerable to contamination by surface water and chemicals. In modern construction, the top 8 feet of the well casings often have to have watertight joints to minimize the risk of contamination by surface water. The ground within a 10-foot radius of the well should slope away from the well to promote surface drainage away from, rather than toward, the well casing. Dug wells often have very good storage characteristics. For example, a 2-foot diameter well with 10 feet of water in it forms a reservoir of roughly 200 gallons. Dug wells are very susceptible to minor changes in groundwater levels. A slight decline could render the well useless.

Bored Wells:

Bored wells are typically 2-3 feet in diameter and are usually less than 50 feet deep, although they can be up to 100 feet in some cases. The depth is limited by how much excavation can be done without the walls caving in. A bored well also provides a good reservoir. As with dug wells, the casing joints should be watertight for pollution protection; the top of the well casing should be at least 12 inches above grade and sealed tightly at the top; and the surface grading around the well should slope down and away from the well.

Be sure to check out or next segment on drilled wells. If you need a well inspection or testing of your well water, please give us a call!

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