welldrain

from The Century Dictionary.

• To drain, as land, by means of wells or pits, which receive the water, and from which it is discharged by machinery.
• noun A drain or vent, somewhat like a well or pit. serving to discharge the water of wet land.
• noun A drain leading to a well or pit.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To drain, as land; by means of wells, or pits, which receive the water, and from which it is discharged by machinery.