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Water Well Drilling for Your Home

Drilled Wells in Bedrock

In Nova Scotia, you can find various styles of drilled wells with the most common kinds constructed and drilled into bedrock. Bedrock is essentially an underground mountain range covered by the overburden: clay, sand, gravel, boulders, and topsoil.

To create a well in bedrock, first Delta Drilling drills through the overburden and then an 8.5 inch hole is drilled into the bedrock itself. This allows a flat bottom in the bedrock, giving the casing pipe the ability to sit flush and make a watertight seal.

After the first hole is drilled, we lower a 6.25 inch casing into the hole in 20 foot lengths and weld them together as they are lowered to the bottom. Grout is then pushed up the annular space to create a tight seal. (Our grout mixture is made up of bentonite and water, which will expand and not allow surface water to leak past the casing pipe.) Using a smaller drill bit (6.125 inches in diameter), we drill into the bedrock until an ample supply of water is found.

Water Supply Required

The water supply your well needs varies and is stipulated by the Department of Environment. For instance, a well at:

  • 100 feet needs 2.5 gallons per minute
  • 200 feet needs 1 gallon per minute
  • 250 feet needs .5 gallons per minute

You might wonder why you need less water the deeper the well goes. A deeper well has the greater storage capacity. A 6 inch well’s storage capacity is about 1.4 gallons per foot, so if your well is 300 feet deep it can hold approximately 420 gallons of water which is more than the average household uses in a day. If your well only produces .5 gallons per minute, it will replenish itself by the next morning.

The yield standard, given by the Department of Environment, is a minimum standard. Delta Drilling does not strictly adhere to the minimum standard as we have seen in the past that an expanding subdivision can lessen the yield of a well that was drilled during the start-up phase of that development. Therefore, Delta Drilling strives to achieve higher than the minimum yield outlined by the Department.

When to Build Your Well

Delta Drilling highly recommends that your well is drilled on your property before your house is built. Doing this ensures an adequate supply of water can be obtained before you build your home. In the past, we’ve seen contractors have wells drilled two days before closing the house only to discover there was no water.

Another advantage of drilling your well prior to home construction is that you avoid potential damage to the foundation. For example, a small property only has a few places where a well could be drilled, and if it is drilled 20 feet from the foundation there could be a potential hazard.

A drill uses about 350 psi of air at 1050 cubic feet per minute which can cut rock similar to a jackhammer. If the hole cut caves in above the drill bit, the air pressure will find the path of least resistance which is often previously dug out sections like your foundation. This pressure can lift the ground and crack your foundation. Although this is extremely rare, it’s something that should be considered as a potential hazard. We encourage you to set up a site visit with us so we can explain all the possibilities in detail.

In addition to our well drilling services, Delta Drilling provides hydrofracking. For more information, contact us today.