TL;DR
Drawdown is how far the water level in a well falls below its static level while the pump runs, measured during a yield test to judge what the well can sustain. The word also names a pressure tank's usable capacity — the gallons delivered between the pump's cut-in and cut-out pressures, which on a typical 40/60 switch is roughly a third of tank volume.
What it means
Drawdown is how far the water level in a well falls below its static level while the pump runs, measured during a yield test to judge what the well can sustain. The word also names a pressure tank's usable capacity — the gallons delivered between the pump's cut-in and cut-out pressures, which on a typical 40/60 switch is roughly a third of tank volume. Excessive well drawdown points to a declining aquifer or an oversized pump short-cycling the system.
Where it sits in the glossary
Drawdown is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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