1972: Commencement of International P.G. Hydrology Course at Roorkee supported by Govt. of India and UNESCO with the launch of International Hydrological Decade 1965-74.
1977: International Hydrology Course christened as School of Hydrology. Specialization on Surface Water Hydrology and Groundwater Hydrology Introduced.
1980: Support of WMO and The Royal Netherlands Govt. started. Watershed Management Specialization introduced.
1982: Opening of Laboratory Building at the School of Hydrology.
1985: School of Hydrology upgraded as Department of Hydrology. IDRC (Canada) support commenced.
1985: Inauguration of the new academic block of the Department of Hydrology and its shifting to the present location.
1997: Silver Jubilee Anniversary year of the Department. International Symposium on ‘Emerging Trends in Hydrology’ (ISETH-97) organized.
1999: Induction of the Department into Special Assistance Programme (SAP) of UGC at the level of Department Research Support
2003: Funds for Improvement in Science & Technology Infrastructure in the University and Higher Educational Institution (FIST).
2003: Extension of the Department Building (on 1st floor).
2005: International Conference on “Hydrological Perspectives for Sustainable Development” (HYPESD-2005), Feb. 23 -25, 2005.
2015: The Department of Hydrology was recognized as one of the WMO - Regional Training Centre.
2022:Golden Jubilee Anniversary Year of the Department.