Johansson, L.S., Søndergaard, M. & Andersen, P.M. 2021. Søer 2020. NOVANA. Aarhus Universitet, DCE – Nationalt Center for Miljø og Energi, 80 s. - Videnskabelig rapport nr. 474. https://dce2.au.dk/pub/SR474.pdf
The current monitoring programme for lakes (encompassed by NOVANA) includes monitoring in relation to the EU Water Framework Directive (European Union 2000) and the EU Habitats Directive (European Union 1992). Data collected pursuant to the above-mentioned directives also contribute to the fulfilment of national monitoring obligations and data requirements in connection with, among other things, the Nitrates Directive and the NEC Directive's requirements regarding the effects of nitrogen deposition. According to the Water Framework Directive (WFD), there are two main types of monitoring – surveillance monitoring and operational monitoring. According to the Habitats Directive, surveillance monitoring and mapping of lake habitats are required. As to surveillance monitoring of lake habitats and mapping of small lakes and ponds < 5 ha, a separate programme exists. The location of the lakes in the surveillance monitoring referred to in this report is shown in Figure 1.