For the larger part of Manitoba, most granite wells are located in the Whiteshell area which generally are used for cottages.
Most granite bedrock contains few cracks at depths normally reached by wells. That’s why it’s often difficult to get a lot of water from a granite well. The few water-bearing cracks present in granite usually occur in the first 200 feet.
Sometimes hydrofracturing is required to obtain a higher yield, in which large volumes of water are injected into a drill hole under thousands of pounds of pressure to open water-bearing cracks in bedrock.
Many drillers recommend extending the bedrock drill hole to great depths for low-yielding wells because the drill hole can act as a water storage reservoir. for example: A six-inch diameter drill hole or casing can hold one-and-one-half gallons of water for every foot of depth. If your new well is deep, it may store a large volume of water even if the well becomes recharged with groundwater very slowly. A six-inch diameter well containing 200 feet of standing water could store 300 gallons of water.
Families who use water prudently can get by with a well yielding one gallon a minute or less if the well has enough depth to provide storage capacity.