Quick Answer
A 1 HP submersible pump can be sufficient for shallow to moderately deep wells, but for deeper wells, a higher horsepower rating may be required to meet flow rate and pressure demands.
Sizing Submersible Pumps for Deep Wells
When sizing a submersible pump for a deep well, it’s essential to consider the well’s static water level, total dynamic head (TDH), and required flow rate. A 1 HP submersible pump typically has a maximum TDH of around 400-500 feet, depending on the manufacturer and model. For wells deeper than 500 feet, a 2-3 HP pump may be necessary to achieve the required flow rate and pressure.
Understanding Well Dynamics
The well’s static water level and TDH play critical roles in determining the required pump size. The static water level is the depth below the well’s surface where the water table intersects the well casing. The TDH is the sum of the static water level, the well’s casing depth, and the pressure head required to overcome friction losses in the well and pipeline. For example, if a well has a static water level of 200 feet, a casing depth of 500 feet, and a required pressure head of 100 feet, the total TDH would be 800 feet. In this case, a 2-3 HP pump would likely be required to meet the flow rate demands.
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