Low Yield Well
In a well that has a low flow rate such as; two or three GPM, the depth of the well comes into play. A well itself is a reservoir that typically stores water at @ 1.5 gallons per foot. In this example we have a well that is 550 feet deep, and has a production rate of 2.5 GPM. This type of system, depending on the area to be covered, is somewhat complex to set up. 2.5 GPM is not sufficient enough to create the water flow needed to drive a sprinkler zone, more water will be necessary, and you will have to rely on the reservoir in the well to support the system. An accurate flow test is a crucial element; in deciding the time frame in which the system is able to operate. In such cases, you would not be able to water indefinitely. If the system is set up for 6 GPM, we are relying on being able to use 400' of the reservoir or in other words 600 gallons of water, plus the added 250 gallons produced in the first 100 minutes. This leaves us with roughly 850 gallons of water to play with for an estimated run time of 141 minutes. Bear in mind that the longer the well is run, the longer the recovery time will be. If four hours is needed to water your lawn properly, some figuring would be necessary to make the system function to its potential.
* Although you are able to run an irrigation system on a low yielding well it is highly recommended that you consider adding a secondary well supply, especially if you are attempting to use the well as a source of both residential and irrigation water supply.
** Please note that the weather can affect the water table in certain regions and this can greatly affect low yielding wells storage.
*** Their are some possible options to increase the flow of a low yielding well such as; well deepening, hydro fracture and zone hydro fracture. These are not guaranteed ways of increased flow all wells react differently. In most cases we are able to recommend the best course of action based on other wells in your area.
We highly recommend talking to one of our specialists when trying to decide a course of action to take regarding your particular situation!
1-800-562-WELL (9355)
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