Jet pump installations — are there any special considerations?

Selecting the Right Jet Pump and Well Configuration

Selecting the right jet pump and well configuration is critical for efficient and reliable operation. For shallow wells, a submersible jet pump is often the best choice, as it can be easily installed at the bottom of the well and provides a compact footprint. When selecting a jet pump, consider the well’s static level (the water level in the well when the pump is not operating) and the required flow rate. A general rule of thumb is to select a pump that can deliver 2-3 gallons per minute (GPM) per foot of well depth.

Well Casing and Screening Requirements

The well casing and screen must be properly sized and configured to allow for adequate water flow. A well casing that is too small can restrict water flow and lead to premature pump failure. A properly sized screen should be installed at the bottom of the well to capture the surrounding aquifer water. The screen should have a sufficient slot size and length to allow for the desired flow rate. For example, a 2-inch well casing with a 1-inch screen and 10 feet of screen length may be suitable for a shallow well with a static level of 20 feet.

Installation and Sizing Considerations

When installing a jet pump, consider the location and clearance requirements. The pump should be installed in a well-ventilated area, protected from the elements, and with sufficient clearance for maintenance and replacement. The pump should be sized to match the well’s flow rate and pressure requirements. A general rule of thumb is to size the pump to deliver 10-20 pounds per square inch (PSI) of pressure to the surface. For example, a pump that delivers 15 PSI and 5 GPM may be suitable for a shallow well with a flow rate of 10 GPM.