Results of the sub-steps in the designation of eutrophicated areas according to § 13a DüV (05/2022) and according to §§ 9 to 11 AVV GeA

Results of the sub-steps in the designation of eutrophicated areas (state of play: 05/2022) of the State of North Rhine-Westphalia pursuant to Section 13a of the Fertiliser Ordinance (DüV 2020). The table contains the results of the partial evaluations for the phosphate evaluation, biology evaluation and the significant nutrient inputs according to AVV GeA. Included are those OFWKs that meet all the criteria for designation as a eutrophicated area (for information on how to proceed, see the document “Explanations Eutrophicated Areas NRW (12_2022)”). For the phosphate and biology assessment, the WFD measuring point used is indicated, the results of which were decisive for the designation. The measuring points are also included in the spatial data set ‘GLDE designation network-eutrophicated-areas-NRW _ETRS25832_Shape.zip’. In some cases, different measuring points were used for the phosphate and biology evaluation if this was necessary and useful from a technical point of view. For phosphate, it is indicated whether the results for orthophosphate phosphorus or for the substitute parameter total phosphate phosphorus were used in the designation. In the biology assessment, the assessments are given for all biological quality components to be examined. At least one is always rated ‘moderate’ or worse. The last columns of the table show the results of the significant nutrient input resulting from the MEPhos modelling (https://www.flussgebiete.nrw. de/growa-nrw-2021-4994). This concerns both the share of agricultural P entries in the total entry, which here amounts to at least 20%, and the amount of agricultural P entries, which is also a criterion for the designation of an OFWK catchment area as a eutrophicated area if the ecoregion comparison value (see last column) is exceeded. For the OFWK, which are marked as dam observatories in the column ‘Water type’, the results of the lower dam were used for phosphate and biology (see step 6 in ‘Explanations Eutrophicated areas NRW (12_2022)’