Hydrology Subcommittee

Membership
Terms of Reference
Adopted 6 June 1995

1. Coordinate Great Lakes-St. Lawrence River System forecasted water level information for publication in Canadian and U.S. Water Level Bulletins and News Releases.
   
2. Review and coordinate hydrometeorological data collection, coverage and timeliness and recommend modifications as necessary to meet the needs and accuracy requirements for water level forecasting, lake regulation, international studies and for other related uses.
   
3. Review the adequacy of the tributary water quantity gauging networks, and recommend relocations, additions or deletions to the networks to meet the changing needs of the users.
   
4. Coordinate hydrometeorologic data for the Great Lakes-St. Lawrence River System, including, but not limited to:
   • Net Basin Supplies
   • Precipitation (land surface, lake surface and total basin)
   • Evaporation (lake and land)
   • Runoff
5. Update and disseminate listings of hydrologic models for the Great Lakes-St. Lawrence River System.
6. Coordinate the development and updating of hydrologic models of the Great Lakes-St. Lawrence River System used for water level forecasting, lake regulation and international studies.
7. Coordinate and update physical data of the Great Lakes-St. Lawrence River System, separately (Canada and U.S.) and combined, including:
   • Drainage areas (land surface, lake surface and total basin)
   • Lengths (shoreline (mainland and islands) and connecting channels)
   • Lake volumes
   • Lake depths (maximum and average)
   • General lake dimensions (maximum length and breadth)
   • Lake storage capacities (per metre of depth)
   • Great Lakes Basin and sub-basin delineations
8. Update and disseminate Great Lakes-St. Lawrence River System physical and hydrometeorological data and its metadata.