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Mississippi Embayment Regional Aquifer Study
How much groundwater do we have?
An estimate of the volume of water
stored in the alluvial aquifer was made
by calculating the simulated thickness
of the saturated zone and multiplying by
the specific yield. The volume of water
in 2007 stored in the alluvial aquifer was
estimated to be approximately 536 million
acrefeet (equivalent to 10.7 feet of
water covering the entire study area).
Cumulative storage change within all the
aquifers simulated in the MERAS model
indicates overall depletion of 140 million
acrefeet (equivalent to 2.8 feet of
water covering the entire study area, and most of
the water is from the alluvial aquifer) from 1870
(fig. 2). Therefore, the total amount of water removed
from aquifer storage to date in the Mississippi embayment
equals approximately 26 percent of the amount stored
only in the alluvial aquifer.
