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Great Lakes Consumptive Use Coefficients and Basin Mapping for Ontario

This technical backgrounder provides generalized consumptive use coefficients currently used by the Province in meeting its annual water use reporting requirements of Article 301 of the Great Lakes - St. Lawrence River Basin Sustainable Water Resources Agreement. Ontario and Quebec, along with the eight Great Lake States of Illinois, Indiana, Michigan, Minnesota, New York, Ohio, Pennsylvania and Wisconsin (Parties) signed the Great Lakes St Lawrence River Basin Sustainable Water Resources Agreement (Agreement) in December 2005. The Agreement commits the Parties to a number of water management and information programs. Article 301of the Agreement calls for the Parties to annually collect and report water use data to the Great Lakes regional water use database. This reporting commitment includes water withdrawals (or takings), as well as the amount of water consumed.

This map provides detailed information on Ontario's Great Lakes Basin and Connecting Channel watershed boundary delineations in support of the Great Lakes St Lawrence River Basin Sustainable Water Resources Agreement.  Additionally the map shows the Municipal Boundary structure of Ontario, including Lower, Single and Upper Tier municipalities within the province.



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