The water that replenishes the Great Lakes comes from precipitation.
Precipitation is, in turn, driven by the global climate. Rain and snow fall directly on the lakes and on the lands drained by tributary rivers and streams. The
majority of water that enters the system falls as rain or snow on the watershed,
becomes ground water, and is discharged to the lakes through tributaries. Using
new information,6 it has been estimated that approximately 53% of the new
water entering the Great Lakes takes this ground water pathway. The second
largest category, about 24% of new water on a system-wide basis, is surface
runoff that drains into tributaries and, ultimately, to the lakes themselves.
Over-lake precipitation, subtracting evaporation losses, accounts for about
20% of the new water entering the lakes. The remaining 3% of known inputs to
the lakes are the diversions into the system from the Hudson Bay drainage that
enter in Lake Superior.
The water that replenishes the Great Lakes comes from precipitation.Precipitation is, in turn, driven by the global climate. Rain and snow fall directly on the lakes and on the lands drained by tributary rivers and streams. Themajority of water that enters the system falls as rain or snow on the watershed,becomes ground water, and is discharged to the lakes through tributaries. Usingnew information,6 it has been estimated that approximately 53% of the newwater entering the Great Lakes takes this ground water pathway. The secondlargest category, about 24% of new water on a system-wide basis, is surfacerunoff that drains into tributaries and, ultimately, to the lakes themselves.Over-lake precipitation, subtracting evaporation losses, accounts for about20% of the new water entering the lakes. The remaining 3% of known inputs tothe lakes are the diversions into the system from the Hudson Bay drainage thatenter in Lake Superior.
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