Committees of experts do the preparatory work for the Moselle Commission and its delegates.
The Legal Affairs Committee examines all legal matters, for instance those relating to the Moselle Convention.
The Shipping Dues Committee, as the name suggests, works out the conditions that apply to the levying of shipping dues provided for under the Moselle Convention.
The Waterway Police and Waterway Marking Committee takes care of the regulations that apply on the Moselle to ensure that traffic flows easily and securely; the regulations are also designed to avert hazards posed by shipping. All regulations are enshrined in the Moselle Waterway Police Ordinance.
The Technical Committee examines any planned construction project on the Moselle. It particularly verifies whether a project is compatible with the interests of shipping. Topics under current examination include the doubling of locks in the German section and the lifting of bridges in the French section. But projects that have a medium-term planning horizon, for instance the Saône-Moselle connection that is being discussed by the French Government, are also debated at the meetings of the Technical Committee.
The Technical Committee also determines the closing periods for the locks on the Moselle.
Should a project or a problem concern more than one committee, then the committees may also discuss these matters jointly, and for that purpose they may set up a so-called mixed committee.
An example of such a committee is the mixed Technical and Legal Affairs Committee, which only recently debated and decided on the upkeep, renewal and operation of the wall and jetty structures at Apach; Apach lies in the area between the three states bordering the Moselle. As a result, an agreement between the three states was signed at an official ceremony on 1 October 2009.
The committees may also set up working groups, in which experts from the three riparian states take part, in order to deal with specific technical topics.
The Waterway Police and Waterway Marking Committee, for instance, has set up the working group “Modern Information Exchange Services and Systems/MIB-MOVES”.
The Drainage Management Working Group was founded at the instigation of the Technical Committee.
The Moselle Commission also has a Board of Appeal, a panel with a judge from each member state. It may be resorted to in place of the court of appeal which normally has jurisdiction.