Supporting the Flemish Environment Agency (Vlaamse Milieumaatschappij, VMM) in the preparation and maintenance of the emission inventory of priority substances to the surface waters in the Flemish Region of Belgium in line with the provisions of Article 5 of Directive 2008/105/EC. Support is also provided with respect to the mandatory reporting of emissions to the EU. This is a six - year cycle with a first reporting which started in 2013. VMM uses to this effect the WEISS system. The WEISS system is further enhanced with new functionality and data.