crease in benthic productivity might be less in each 
type of area. The configuration of the canals deter- 
mines the rate and extent of eutrophication. Low dis- 
solved oxygen resulting primarily from poor water 
circulation has been identified as a major problem in 
relation to maintaining biological productivity in de- 
velopment canals (Reish, 1961; Taylor and Saloman, 
1968; Moore and Trent, 1971; Corliss and Trent, 1971; 
Lindall, Hall, and Saloman, 1973). 
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