Annapolis Metropolitan Well Flow/Yield Information

How A WelGard Inspection/Warranty Is Performed

For best results, water should be taken directly from the pressure tank whenever possible. Water is run from the well in five-gallon intervals. The last one or 5-gallon reading is determined to be the “well flow” or “yield” for that well.

Because water runs through the bottlenecks of the good pump and pressure tank, 10-12 gallons per minute is usually the best result for the test. This number may differ from the good yield results when drilling, as the bottleneck will have been eliminated.

Yield tests for existing wells in which a submersible pump has been installed and connected to a water distribution system may be performed by the following procedure:

1. The contractor performing the test shall provide a testing manifold consisting of an inlet for connection to the pressure line from the well and a tee with a pressure gauge graduated with intervals of at least 2 pounds per square inch (psi) capable of measuring up to 200 psi.
2. The testing manifold must be connected to bypass the pumping switch mechanism.
3. The pump should be turned on, and the manifold valve should be opened completely. Time, flow rate, and pressure readings must be recorded every 15 minutes.
4. If the water level is drawn down to the pump intake, turn the pump off and record the time. Wait a set period (15 minutes); turn the pump back on and measure the discharge of the water until the water level is drawn down to the pump intake again. Record the time and repeat this process at least three times to determine the recovery rate (well yield). The Well Yield is determined by dividing the average discharge (in gallons) by the average interval (in minutes) between each time the pump was shut off.

For recovery rates of 4 gallons/minute or greater, testing may be terminated after three hours if:

• The water level is determined to have dropped no greater than 200 feet through the duration of the test; or
• The discharge pressure does not vary by more than five psi.

For Well Yields less than 4 gallons/minute, the yield test shall continue by valving down the discharge to the approximate well yield determined in step (4) and recording the flow rate and pressure every 15 minutes until the correct hours have passed from the commencement of the test.

How A WelGard Inspection/Warranty Is Performed

For best results, water should be taken directly from the pressure tank whenever possible. Water is run from the well in five-gallon intervals. The last one or 5-gallon reading is determined to be the “well flow” or “yield” for that well.

Because water runs through the bottlenecks of the good pump and pressure tank, 10-12 gallons per minute is usually the best result for the test. This number may differ from the good yield results when drilling, as the bottleneck will have been eliminated.

Yield tests for existing wells in which a submersible pump has been installed and connected to a water distribution system may be performed by the following procedure:

1. The contractor performing the test shall provide a testing manifold consisting of an inlet for connection to the pressure line from the well and a tee with a pressure gauge graduated with intervals of at least 2 pounds per square inch (psi) capable of measuring up to 200 psi.
2. The testing manifold must be connected to bypass the pumping switch mechanism.
3. The pump should be turned on, and the manifold valve should be opened completely. Time, flow rate, and pressure readings must be recorded every 15 minutes.
4. If the water level is drawn down to the pump intake, turn the pump off and record the time. Wait a set period (15 minutes); turn the pump back on and measure the discharge of the water until the water level is drawn down to the pump intake again. Record the time and repeat this process at least three times to determine the recovery rate (well yield). The Well Yield is determined by dividing the average discharge (in gallons) by the average interval (in minutes) between each time the pump was shut off.

For recovery rates of 4 gallons/minute or greater, testing may be terminated after three hours if:

• The water level is determined to have dropped no greater than 200 feet through the duration of the test; or
• The discharge pressure does not vary by more than five psi.

For Well Yields less than 4 gallons/minute, the yield test shall continue by valving down the discharge to the approximate well yield determined in step (4) and recording the flow rate and pressure every 15 minutes until the correct hours have passed from the commencement of the test.

A WelGard Inspection/Warranty is a timed test to determine how many gallons a Well System can produce per minute. A WelGard Inspection/Warranty will show the following:

• A functioning well pump and pressure tank
• If a well is running dry or lacks sufficient recuperation
• The reserve amount sitting in the well
• If home buyers would need to stretch the time between running water for showers, laundry, dishwasher, car washing, etc.

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