Patent ID: 7975937

Claim:
A liquid management system comprising: a first chamber for containing a liquid, the first chamber having a first boundary wall; a second chamber for containing the liquid, the second chamber having a second boundary wall and a base surrounded by the second boundary wall, the second boundary wall being within the first boundary wall and having a second wall height lower than a first wall height of the first boundary wall; and a liquid level control module for controlling i) a first level of the liquid within the first chamber, and ii) a second level of the liquid within the second chamber, the liquid level control module being operable to lower the second level of the liquid in the second chamber below the second wall height while concurrently maintaining the surface level of the liquid in the first chamber higher than the second wall height such that the liquid within the first chamber flows over the second boundary wall from the first chamber into the second chamber at an overflow rate to form a void in the liquid, the void having liquid sides inside the second boundary wall.