Residential / Commercial Well Yield Flow Testing
Water Needs Analysis Pump Test Investigation conducted by a P.Geo.
Optional Flow Test
If the well cap is buried under the ground and the seller is not prepared to have the well cap removed and accessible for the testing required, then there is an alternative flow test that can be done. We have a methodology to conduct this test and we will require access to the water pressure tank and a working pressure gauge at the water pressure tank.
This is not a hydrostatic test. No pressure is being blown on the lines. We are just running water from an outside tap. Canada Mortgage and Housing Corporation (CMHC) require 18 litres per minute (4.0 imperial gallons per minute) for one hour, and the ability to reproduce this yield 24 hours later, before they will approve a mortgage loan. As for existing wells, CMHC underwriters are only concerned about potability, not quantity. It is the banks that may impose refusal of a mortgage if quantity is not met for existing wells. This test is more expensive as it requires two site visits.
Note: This test indicates if a daily water volume requirement can be obtained again within a 24 hour period during the two day test. The down side to this testing is that the calculated safe yield of the well at the time of the hydraulic load test can not be determined as water well drawdown and recovery measurements from within the well cannot be obtained. In order to conduct this work the well needs to be located, dug up and the well cap will need to be removed to allow access for the water sampling probes, as indicated above.
Contact my office at the above numbers for further details and Site Preparation Requirement Instructions!