The ninth and last session of the International Hydrological Decade Coordinating Council was held at Unesco House in Paris from August 29 to 30, 1974. The session ended on a note of nostalgia for the IHD's 10-year effort and a note of hope for the succeeding International Hydrological Program (IHP).

The principal accomplishments of the session were the termination of the mandates of the existing working groups, the submission of recommendations to the Unesco General Conference for the completion of publications begun but not yet issued, and the preparation of recommendations concerning the operations of working groups and panels to the Intergovernmental Council of the IHP.