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After the industrial revolution, urban growth has been increasing, especially with technological advances. Urbanization is accelerating environmental pollution and also affects climate significantly because of land use or land cover changes. In this study, the Hydrological Simulation Program-Fortran (HSPF) model developed by the United States Environment Protection Agency (USEPA) is used for modeling the impervious areas of Eskişehir which is located in the Porsuk Stream Watershed in Inner Anatolia, Turkey. Effects of impervious areas of Eskisehir on the Porsuk Stream pollution between 1975 and 2010 have been investigated. Important water quality parameters like nitrate, orthophosphate, sediment, chloride, and total coliform are modeled. Impervious land segments have been found to be affecting all parameter concentrations and also surface flows significantly as determined using the t test with a confidence level of 95 %.

Modern agricultural techniques and inputs should be used to increase the yield and quality of products. The use of pesticides for plant protection products is one of these inputs and is a significant component of modern agriculture. Agricultural runoff is the main reason of nonpoint source pollution, which adversely affects surface and ground water quality. The runoff process drives pesticide transport and fate with high spatial and temporal variability in agricultural watersheds. In this study, the presence of pesticides in the water environment of the Borabey Pond and watershed which is situated in the foothills of Bozdağ to the north of Eskişehir, Turkey is determined by measurements. For this purpose, soil samples from the watershed and sediment and water samples from the pond were taken. In these samples, pesticides were analyzed at regular intervals. Based on the results of the analysis, pesticides currently present in the watershed were modeled assuming the pond as a well-mixed system. The accumulation of pesticides in the watershed was found to be representable by the model. In this study, instead of performing pesticide modeling in a short time period, it is aimed to simulate how the past use is reflected to the present. Model and measurement results are observed to be comparable to each other.

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