Great Lakes Regional Water Use Database

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Great Lakes Regional Water Use Database

Introduction

Consumptive Use Coefficients

Water Use Category Definitions

General Definitions and Abbreviations

Contacts

Michigan Water Use Reporting Program (Michigan DEQ)

Great Lakes Information Network

Water Quantity and Use

Questions

Comments or questions about the Great Lakes Regional Water Use Database? Contact Marilyn Ratliff at mratliff@glc.org

Great Lakes
Regional Water Use Database


General Definitions and Abbreviations bgd: billion gallons per day bld: billion liters per day consumptive use: that portion of water withdrawn or withheld from the Great Lakes basin and assumed to be lost or otherwise not returned to the Great Lakes basin due to evapotranspiration, incorporation into products, or other processes Great Lakes surface water (GLSW): the Great Lakes, their connecting channels (the St. Clair River, the Detroit River, the Niagara River and the St. Marys River), and the St. Lawrence River groundwater (GW): all subsurface water interbasin diversion: a transfer that take place between the Great Lakes basin and another watershed intrabasin diversion: a transfer that takes place between the watershed of one of the Great Lakes and another level of accuracy: the quality of data based on percentage of total volume and rated as 1) measured; 2) partially measured or 3) estimated, level of aggregation: the quality of data based on percentage of total volume and rated as 1) originating from site-specific sources or 2) originating from higher level aggregate sources, such as county or census databases mgd: million gallons per day mld: million liters per day other surface water (OSW): tributary streams, lakes, ponds, and reservoirs within the Great Lakes basin principal facility: facilities withdrawing in excess of the Great Lakes Charter uniform trigger level of 100,000 U.S. gallons/day (380,000 liters/day) average over a 30-day period. A principal facility is determined by the total withdrawal (or consumption) of all sources combined (Great Lakes surface water, other surface water, and groundwater) rather than a single source. The combined withdrawals (or consumption) of separate wells or operations undertaken by the same facility or company will be evaluated separately for the purpose of determining principal facility status unless those operations are covered under the same registration (or permit) or are physically contiguous. Principal facilities are a subset of all facilities in the database. tgd: trillion gallons per day tld: trillion liters per day withdrawal amount: water removed or taken from surface or groundwater (including hydroelectric use)


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