Quick Answer
Short Answer: A pitcher pump, also known as a suction pump, has limitations in pumping water from a well, typically unable to exceed a drawdown of 5-7 feet and a flow rate of 1-3 gallons per minute.
Understanding Pitcher Pump Mechanics
A pitcher pump works by creating suction in the well casing, using a hand-operated lever to draw water up the pipe. The pump’s ability to pump water is limited by the length and diameter of the well casing, as well as the surrounding water table. For every foot of drawdown, the pump’s suction pressure decreases, leading to reduced flow rates.
Calculating Pitcher Pump Capacity
To determine the maximum flow rate of a pitcher pump, you can use the following formula: Flow Rate (gpm) = (Well Diameter x Well Depth x Suction Lift) / 1000. For example, if the well has a 6-inch diameter, a 50-foot depth, and a suction lift of 5 feet, the maximum flow rate would be approximately 2.25 gpm. Keep in mind that this is an estimate and actual flow rates may vary depending on several factors, including the pump’s efficiency and the well’s water quality.
Practical Applications and Limitations
Pitcher pumps are often used in shallow wells or for small water needs, such as irrigation or drinking water for a single household. However, they are not suitable for larger water demands, such as residential or commercial use. Additionally, pitcher pumps require regular maintenance, including cleaning and lubricating the moving parts, to ensure optimal performance.
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