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Abstract Environmental problems are large scale phenomena which vary slowly in both space and time simultaneous, and continuous monitoring of these phenomena is a necessary pre-requisite to success full management of the limited resources of the enviromnent and to the effective protection against many environmeral problems. Lakes and reservoirs can be considered as ”storage tanks” for fresh water, with input and output points of water. The origin of Lakes could be tectonic, volcanic, by land slides, by glacial activity, by river activity, or by wind action. It could also be of organic origin created by changed action of plant growth .. ud associated detritus, by short line activity or by solution (Jorgensen, 1980)(1). In Lakes three distinct zones are generally evident: 1. The littoral zone The shallow water region with light penetration to the bottom, often occupied by rooted plants in natural Lakes. 2. Profundal zone The bottom and deep water area beyond the depth of effective light penetration. 3. Limnetic zone The open water zone to the depth of effective light penetration. |