The model system MoRE

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Model development

Substance sources and emission pathways for water pollution (Fuchs et al., 2010)
System architecture of the open source model MoRE

The Directive 2008/105/EC (on environmental quality standards) of the European Parliament and the Commission[1] asks the member states for an emission inventory of priority substances for all river basin districts. This task requires appropriate data and approaches to describe the current state of surface water bodies and to evaluate appropriate measures for the reduction of emissions into the surface water bodies. The overall aim is to achieve a good ecological state of surface waters and to comply with the quality standards.

To meet these demands, the established MONERIS nutrient emission modeling system [2], was adapted to the modeling of pollutant emissions into water bodies and implemented in an open source environment as the river basin management system MoRE (Modeling of Regionalized Emissions).

The following emission pathways are implemented in MoRE:

  • Pathways with point sources:
    • Municipal wastewater treatment plants (MWWTP)
    • Industrial direct dischargers
    • Emissions of historic mining sites
  • Pathways with diffuse sources:
    • Erosion
    • Surface runoff
    • Tile drainage
    • Direct atmospheric deposition onto water surfaces
    • Sewer systems
    • Groundwater
    • Inland navigation

In addition to modeling emissions into the water bodies, an estimation of the river load on the basis of total emissions and a substance-specific retention is carried out. The modeling approaches and sources of input data are described in detail in Fuchs et al. (2010) [3] and Fuchs et al. (2017)[4].

Implementation of MoRE

Further informationen at Implementation of MoRE.

The MoRE system is based on a PostgreSQL/SQLite database, a generic calculation engine and two graphical user interfaces (GUI): the MoRE Developer and the MoRE Visualizer. The GUIs have been developed for user interaction with the database. The database content can easily be read, edited and extended via the MoRE Developer GUI. Modeling is done via a calculation engine which is incorporated in the Developer GUI a dynamic linkage to the database. Modeling results can be exported as a spreadsheet from MoRE Developer and visualized as a map or chart via a GIS-browser (MoRE Visualizer). MoRE can either be operated by multi user access using a network connection (as an open source PostgreSQL database) or as a single user application for PC (SQLite database).

Current applications of MoRE

While the development of the original MoRE-entity for all German river basin districts is ongoing, the model was and is used at the IWG for more detailed analyses in sub-basins:

  • Inn-catchment: By order of the Federal Environmental Agencies of Germany and Austria and in cooperation with the Bavarian Environmental Authority, the research is focusing on harmonizing of input data and modeling approaches across state borders.
  • Baden-Württemberg: A detailed analysis of nutrient emissions with the best available data is performed for the water bodies in the federal state of Baden-Württemberg by order of its Agency for Environment, Measurements and Nature Conservation (LUBW).
  • Nidda: The German Federal Ministry of Education and Research is funding the cooperative project NiddaMan in the Nidda catchment, where among other aspects, the necessary spatial and temporal resolutions for river water quality modeling are investigated.
  • North Rhine Westphalia: In cooperation with the Environmental Authority of the federal state of North Rhine Westphalia, MoRE is used for modelling nutrient and heavy metal emissions into the water bodies with particular regard to sewer systems
  • Luxemburg: in this project, the data base for modelling of nutrient emissions in Luxemburg is compiled.


  1. European Parliament and the Commission: Directive 2008/105/EC of the European Parliament and of the Council of 16 December 2008 on environmental quality standards in the field of water policy, amending and subsequently repealing Council Directives 82/176/EEC, 83/513/EEC, 84/156/EEC, 84/491/EEC, 86/280/EEC and amending Directive 2000/60/EC of the European Parliament and of the Council, 2008
  2. Behrendt, H., Huber, P., Kornmilch, M, Ley, M., Opitz, D., Schmoll, O., Scholz, G. & Uebe,R. (1999): Nährstoffbilanzierung der Flußgebiete Deutschlands. UBA Texte, 75/99
  3. [1] Fuchs, S., Scherer, U., Wander, R., Behrendt, H., Venohr, M., Opitz, D., Hillenbrand, Th., Marscheider-Weidemann, F., Götz, Th. (2010): Calculation of Emissions into Rivers in Germany using the MONERIS Model - Nutrients, heavy metals and polycyclic aromatic hydrocarbons UBA-Texte 46/2010, Dessau
  4. [2]Fuchs, S., Weber, T., Wander, R., Toshovski, S., Kittlaus, S., Reid, L., Bach, M., Klement, L., Hillenbrand, Th., Tettenborn, F. (2017): Effizienz von Maßnahmen zur Reduktion von Stoffeinträgen - Endbericht, UBA Texte | 05/2017