1. 
   Water column
   [lakes] Carolan Genereal Story, Carolan, Arkansas ...
   Found op http://en.wikipedia.org/wiki/Water_column_(lakes)
   
   
2. 
   Water column
   A water column is a conceptual column of water from surface to bottom sediments. This concept is used chiefly for environmental studies evaluating the stratification or mixing (e.g. by wind induced currents) of the thermal or chemically stratified layers in a lake, stream or ocean. Some of the comm...
   Found op http://en.wikipedia.org/wiki/Water_column
   
   
3. 
   Water column
   The water in some water body treated as spatially homogeneous having light reduced with depth from the surface.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
4. 
   water column
   the entire depth of a water body, from its surface to the bottom.
   Found op http://www.coml.org/edu/glossary/g1.htm
   
   

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