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Net Basin Supply Estimates for the Great Lakes as Computed Using the Component Method by NOAA - GLERL

Tim Hunter;Andrew Gronewold, Anne Clites
Accurate hydrologic data are required for simulation, forecasting, and water resource studies in the Great Lakes system. To address the need for basin-wide estimates of the Great Lakes water balance, NOAA’s Great Lakes Environmental Research Laboratory (GLERL), in the early 1980s, began developing some of the first tools for simulating and forecasting component net basin supplies, i.e., over-lake precipitation, basin runoff and lake evaporation. The approach used by GLERL has been developed over many years (Croley and Hunter, 2008), and represents the first comprehensive attempt to quantify NBS components systematically in all of the Great Lakes. GLERL component NBS for the 1948-2008 period were a crucial piece of information used by the IUGLS in analyzing the water balance and the impacts on Great Lakes levels and flows. As a result of recent studies, GLERL plans to revisit their methods and tools in order to further improve our understanding of the Great Lakes water balance.
Great Lakes Monthly Hydrologic Data
Viewable Data:
GLERL Monthly Component Net Basin Supplies
GLERL Water Level and NBS Component Time Series
Additional Data and Information

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Supporting Content (Show)
Main Topics
Hydroclimate Information
Questions We Asked
What are the historical NBS estimates & how have changes affected lake levels?
Key Findings
Increasing evaporation and precipitation are offsetting, except on Superior
Understanding the Water Balance
Assessing Reliability of Historical Data
View all 3 tasks
Water Supply Sequences