Bl Introduction.. __ 1 Method of study 3 Acknowledgments-__ ____.

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A summary of the occurrence and quality of ground water and its present and potential significance in the regional water supply

The Mississippi embayment is part of a vast geologic and hydrologic province. Most of the region is underlain by aquifers that will yield large quantities of water to wells, so that ground water is the most readily available source of fresh water, Ground water having a dissolved-solids content of less than 500 ppm (parts per million) is generally available at depths of less than 1,000 feet, and water having a dissolved-solids content of less than 1,000 ppm is available in some places to depths of more than 2,000 feet. Iron is the most common troublesome chemical constituent in the ground water. The potential yield of the aquifers that underlie the region is estimated to be about 30,000 mgd (million gallons per day), of which about 3,000 mgd is presently being withdrawn. Water in varying amounts is also available from streams within the region. The amount of water which originates within the region and which leaves it as streamflow during a year averages about 90 million acre-feet (about 80,000 mgd). An additional 400 million acre-feet (about 360,000 mgd) leaves the region as streamflow during an average year, this amount having originated outside the region. The present withdrawals (1965) from streams within the region are about 1,700 mgd.