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A method to assess instream water quality – the role of nitrogen entries in a North German rural lowland catchment

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Academic year: 2017

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Fig. 1. Kielstau catchment (size: 50 km 2 ), with tributaries and loca- loca-tion of wastewater treatment plants, important farms, and sampling points.
Table 1. Water quality classes for surface water bodies according to LAWA (1998) and their thresholds for NH 4 -N and NO 3 -N.
Fig. 3. Measured and modelled daily discharge at the Kielstau catchment outlet, gauge Soltfeld, during calibration period  Novem-ber 1989–OctoNovem-ber 1999 (Nash-Sutcliffe index is 0.73; coefficient of correlation is 0.86).

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