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Residential / Commercial Well Yield Flow Testing

Water Needs Analysis Pump Test Investigation

  • prepare pump test equipment and travel to site
  • conduct a visual outside surface survey of the construction aspects of the well
  • record observations of physical features of the well and surrounding site conditions of the well
  • remove the well cap, conduct a visual inside survey of top of well, obtain water level and probe refusal depth measurements
  • conduct 120 minute water needs analysis pumping test at maximum flow rate of pump on property providing water to house using an outside tap (60 minute drawdown & 60 minute recovery)
  • collect drawdown and recovery measurements to determine if the well can provide sufficient water for the purchasers intended usage according to CMHC requirements and NSE Environment Regulations
  • collect flow metre measurements using a Rockwell flowmetre
  • well disinfection in accordance with the NSE Environment Regulations
  • plot a graph of the drawdown and recovery data and provide an objective evaluation of the field measurements of water quantity information and a professional report
  • contact client with results, provide discussion and recommendations
  • report preparation by a P.Geo. and either emailing or faxing of report in Microsoft Word format only (we have no other conversion formats: ie. Adobe Acrobat/PDF, etc.), "to get the report to you in a timely manner we recommend you provide us with an email address"

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.

However, as a well yield determination test evaluation can not be conducted, a hydraulic flow test to determine if the well can supply a calculated volume of water based on the clients water volume requirements of 340 litres per person per day to meet average needs as defined by the Nova Scotia Department of the Environment and Labour, under peak demand pumping conditions of one hour can be performed. This volume will vary from client to client, which means the well testing must be performed each time this property is to be used by individuals other than our client to ensure that their water quantity expectations of 340 litres per person per day are fulfilled.