Well water to sprinkler system questions
1. You can use the same kind of pump and pressure tank and system as for domestic water supply. If you have a separate system for the sprinkler system only, you can run it at higher pressures (subject to pump, control valve, and sprinkler capability) so the sprinkers will reach farther.
2. You can get a pump that is intended to work without a pressure tank.
With either of the above you can have a multi-hundred gallon cistern between the well and the pump that pressurizes the sprinklers. A second pump in the well, with no pressure tank, fills the cistern. The purpose of the cistern is to allow you to pump and store water from a slow well over a longer period of time while the sprinklers come on for a shorter period of time, drawing water faster than the well can supply it. Unlike a pressure tank, a cistern (by definition) is open to the outside so makeup air can enter as water is drawn out and its pump is controlled by a float similar to that in a toilet tank.
In some areas, a cistern does not meet sanitary codes so a third pump with pressure tank is needed to draw directly from the well to supply domestic water.
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Last edited by AllanJ; 01-30-2013 at 10:42 AM.