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How is the characterization of Water bodies done? The characterization is done by classification into three major components: 1. Hydrology 2. Physical-chemistry 3. Biology.  Water quality assessment is based on the appropriate monitoring of the above three components.   Hydrodynamic features The hydrological cycle inter-connects all freshwater bodies from the atmosphere to the sea. The different stages of water ranging from rainwater to marine salt waters make the water constitute a continuum. The inland freshwaters form parts of the hydrological cycle and they appear in the form of rivers, lakes or ground-waters.  These principal types of water bodies are closely interconnected. These forms may influence each other in a direct manner, or through intermediary stages. Each of the three forms has distinctly different hydrodynamic properties. Rivers are primarily characterized by the unidirectional flow of current. This is accompanied with a relatively high, average flow