When the IMO established a series of technical commissions, one was a Commission for Hydrology (CHy), set up in 1946. At the time of the first WMO Congress (Paris, 1951) CHy had hardly had time to gather any momentum and had no substantial results to report. It is not surprising, therefore, that, when a call was made to reduce the number of technical commissions, it was dropped from the list.
A Commission for Hydrological Meteorology, was established in WMO in 1959 and its first session took place in 1961. The Commission changed its name in 1968 Commission for Hydrology” and WMO assumed responsibility for the operational aspects of the land phase of the hydrological cycle, including the collection, storage and publication of hydrological data. (For more read “Hydrology and water resources within WMO – the birth of a Programme” in WMO Bulletin 57 (3) - July 2008, which looks back at the first 50 years of the Commission.)