As of 2014, two medals will be awarded under the International Hydrology Prize: the Dooge medal and the Volker medal. Both medals are intended to distinguish outstanding achievements by hydrological scientists, but with a different focus. The Dooge medal is aimed at fundamental contributions to the science of hydrology, whereas the Volker medal is aimed at outstanding applications of hydrological science for the benefit of society at large. 

Both Dooge and Volker were eminent hydrologists at a time when Hydrology was an emerging science. Both received the International Hydrology Prize (Dooge in 1983 and Volker in 1984) and both were Presidents of IAHS (Volker in 1963–1967 and Dooge in 1975–1979). A short description of their careers and achievements can be found on our web site under the International Hydrology Prize Winners listing. 

The criteria for the Dooge and Volker medals are specified below. Nominations for the medals should be made by IAHS national representatives and submitted to the Secretary General before 31 December of each year.  The Committee consists of the President and a Vice-President of IAHS and representatives of UNESCO and WMO.

The following applies to both the Dooge and Volker medals:

• The International Prizes in Hydrology shall be awarded to persons who have made outstanding contributions to hydrology such as confers on the candidate universal recognition of his or her international stature.
• The contribution should have an identifiable international dimension extending beyond both the country of normal work and the specific field of interest of the candidate.
• The medals may be awarded to hydrologists of long international standing or to younger but active hydrologists who exhibit qualities of international leadership in the science or practice of hydrology.
• An active involvement in the work of IAHS and other international organizations in the field of hydrology should be counted as an advantage.
• Nominations should be received by the Secretary General no later than 31 December of the previous year.

Specific considerations for the Dooge medal:

• The Dooge medal is particularly intended for hydrologists who have demonstrated scientific excellence, and have made fundamental contributions to the science of hydrology as evidenced by publications in the international scientific literature and other evidence of high standard.
• Preference should be given to candidates who have recently exhibited outstanding international leadership in the science of hydrology.

Specific considerations for the Volker medal:

• The Volker medal is dedicated for hydrologists who have applied their research and hydrological expertise to the benefit of society, addressing issues of public interest and development.
• Applications of hydrology to the benefit of developing countries would count as an advantage.
• Preference should be given to candidates who have contributed through both scientific and practical work, and who have made outstanding contributions to the Hydrology community as demonstrated by active involvement in the work of IAHS or other international hydrological associations.