The bottom of a shaft at which underground water gathers for pumping to the surface
a pit or a pool in which water collects In a cave, a sump may simply be a water-filled low place in an otherwise dry passageway, a small, temporary obstacle which provides an invigorating plunge or ear-dipper for wet-suit clad explorers Or it may indicate that the remainder of the cave beyond that point can only be explored by scuba-equipped cave divers The extent of the sump must be successfully determined before further exploration can continue
A built in basin containing a pump that continually removes groundwater from outside your basements walls and floor, discharging the water away from your house It prevents water from inundating your basement
An additional water reservoir, typically under a tank, to keep equipment out of sight or increase the amount of water in a system