Journal
WATER SCIENCE AND TECHNOLOGY
Volume 58, Issue 11, Pages 2251-2258Publisher
I W A PUBLISHING
DOI: 10.2166/wst.2008.833
Keywords
agricultural and environmental measures; MONERIS; nutrient modelling; Water Framework Directive (WFD); Weser river basin
Funding
- River Basin Commission Weser (RBC Weser)
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To implement the European Water Framework Directive (WFD) into German law, measures have to be taken to reduce the unacceptably high nutrient input into rivers. To identify the most effective measures, the sources and pathways of nutrient emissions into rivers have to be quantified. Therefore, the MONERIS model is applied, which quantifies nutrients emissions into river basins, via various point and diffuse pathways, as well as nutrient load in rivers. Most nitrogen emissions come from groundwater flow (43%), the drainages (30%), and point sources (12%), whereas most phosphorus emissions come from groundwater flow (31%), point sources (23%), erosion (13%) and overland flow (12%). Because of their great distance from the river basin outlet, the southern sub-basins Werra and Fulda-Diemel have an 8% reduction in their nitrogen loads and a 15% and 16% reduction in their phosphorus loads, respectively. This reduction is due to retention in the main part of the river Weser. For the choice of the most effective measures, the different retention in the river is relevant.
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