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Phred,

Yes, the water is only 20 feet below the surface. We live very close to Lake Ontario so finding water or drilling for water is cheap and certain.

Thanks for the tip for measuring the...

Carl,

Thank you for the valuable information.

Is the function of the expansion tank like a capacitor in electronics? That is, is the expansion tank used to ensure constancy of final flow?
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I have a bored well (8" wide, water level 20 feet) that is not being used. Next year I plan on buying a submersible pump and installing pipe to my pond to keep the level consistent during the summer...