The upper layer of water in a thermally stratified lake or reservoir. This layer consists of the warmest water and has a fairly uniform (constant) temperature. The layer is readily mixed by wind action.
EPILIMNION (EP-UB-LIM-KNEE-ON)
Meaning of EPILIMNION (EP-UB-LIM-KNEE-ON) in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012