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Human activities had induced environmental changes, which in turn change the biodiversity. Biodiversity is the variability among living organisms at genetic, species, and ecosystem levels. In this paper will have a look in the different ways, how biodiversity able to use for environmental impact assessment (EIA). EIA is process of evaluating the likely environmental impacts of a proposed project or development, taking into account inter-related socio-economic, cultural and human-health impacts, both beneficial and adverse. Water quality assessment will discuss in relation to the biodiversity changes. Organism live in the range of natural variability. In the species level, tolerant species will adapt to the environmental changes, whereas sensitive species will move to or eliminated from the ecosystem. In the level of population, environmental changes will induce changes in the assemblage of organisms. The species richness and abundance of plankton, diatoms, and vascular plants in the riparian vegetation were evaluated in relation to the effect of land use and water quality. The surrounding land uses and human activities along the aquatic ecosystem were found to have significant impact on the overall water quality and biodiversity of the aquatic biota and riparian vegetation.