The Water Framework Directive establishes that the river basin management plans must have a summary of the pressures and impacts of human activities, such as agriculture, on the chemical and quantitative status of groundwater bodies. In order to identify those areas where a potential impact from agricultural activities on groundwater bodies exists, but currently lacking groundwater monitoring data, a methodology was developed that combines the use of gross nitrogen balance values with the results of a specific vulnerability assessment index. A farm management efficiency parameter is added, to identify the factors that contribute to nitrogen use efficiency and to assess the near-future scenarios. This methodology allows the identification of significant pressures that may be responsible for a groundwater body failing good status where there is no representative monitoring network.
A groundwater perspective on the river basin management plan for central Portugal – developing a methodology to assess the potential impact of N fertilizers on groundwater bodies
M. P. Mendes, L. Ribeiro, J. Nascimento, T. Condesso de Melo, T. Y. Stigter, A. Buxo; A groundwater perspective on the river basin management plan for central Portugal – developing a methodology to assess the potential impact of N fertilizers on groundwater bodies. Water Sci Technol 1 November 2012; 66 (10): 2162–2169. doi: https://doi.org/10.2166/wst.2012.427
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