It is well known that watershed hydrology is dependent on many factors; land use, climate, and soil conditions. But the relative impacts of different types of topography and land use on the surface water are yet to be ascertained and quantified. Agriculture has been identified as a major contributor of non-point source pollution of water resources. Assessment of the environmental impact of NPS pollutants at a localized and regional scale is key component to achieve sustainable agriculture. This research attempted to use a comprehensive approach to examine the impact of land-use practices...