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The concept of the process of diffuse pollution of waterbodies of various dimensions is presented. The algorithm for calculating the average annual volume of removal and migration of the main nutrients—nitrogen and phosphorus—from the catchment into the ravine and river network of a small river is demonstrated. The results of simulating the characteristics of the spring runoff, soil erosion, and removal of nutrients from the catchment area into the Istra River (Russia) with hypothetical changes in its landscape structure under the influence of urbanization and reforestation are developed through a series of calculations.

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