Sump

Definition:

(n.) A round pit of stone, lined with clay, for receiving the metal on its first fusion.
(n.) The cistern or reservoir made at the lowest point of a mine, from which is pumped the water which accumulates there.
(n.) A pond of water for salt works.
(n.) A puddle or dirty pool.

Compare sump with other words:

sump vs. windage

scupper vs. sump

drainage vs. sump

reservoir vs. sump

cesspool vs. sump

sewage vs. sump