The paper describes water quality modeling approaches for the mid-sized river (1001000 km2) catchment in Latvia. The hydro-chemical data (2005 to 2010) in 15 subcatchments of Bērze River (872 km2) represent water quality and land use type-specific concentrations. Water sampling shows that significant pollution results from management of organic manure and intensive agriculture, where the maximum concentrations of nitrate nitrogen are 9.2 and 18.1 mg l−1 reaching or exceeding the limit established by the EU Nitrates Directive of 11.3 mg l−1. The application of pollution load source apportionment could be useful for decision making to set up the action plans for the implementation of appropriate pollution reduction measures.
Abramenko, K., Lagzdiņš, A., & Veinbergs, A. (2013). Water quality modeling in bērze river catchment. Journal of Environmental Engineering and Landscape Management, 21(4), 316-324. https://doi.org/10.3846/16486897.2012.759118
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