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Available drawdown in a borehole is the difference between the static water level or piezometric surface and the main water strike (in fractured aquifers) and the pump depth (in porous aquifers).
The height of water above the depth at which the pump is set in a borehole at the time of water level measurement.
Why is available drawdown important?
If the available drawdown is exceeded, the borehole will dry up.