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xi A Note on Editorial Method A couple of items: The standard unit of measure for groundwater management is the acre-foot (e.g., one foot of water across one square acre of land), or 325,851 gallons, sometimes rounded up to 326,000 gallons. The Ogallala formation is mostly sand and gravel, holding only about 17 percent water, which we can round out to one-fifth water. When an acre-foot is consumed on the land surface, this in effect means the actual removal of five feet from the groundwater formation. This is rarely taken into account when measuring the impact of water consumption , even though it means downdraft is a more serious problem than usually admitted. There can be large variation in the amount of water in one foot of the Ogallala formation. Most studies compare surface water with groundwater on a one-to-one basis. This one-to-one ratio is so commonly used in reporting the decline of the aquifer by pumping that it will continue to be the ratio we utilize throughout this book.¹ Ogallala Platte River Red River Arkansas River B r a z o s R i v e r M i ssouri R i v e r WYOMING SOUTH DAKOTA MINNESOTA IOWA NEBRASKA KANSAS COLORADO NEW MEXICO OKLAHOMA TEXAS M E X I C O Houston Denver Dallas Pierre Oklahoma City Santa Fe Omaha Cheyenne San Antonio Austin Casper El Paso Colorado Springs Topeka Albuquerque Sioux Falls Amarillo Tulsa Lubbock Odessa Carlsbad Wichita Falls Wichita Lincoln 200 mi 0 100 1. The Ogallala aquifer (also known as the High Plains aquifer) is the largest body of groundwater in the United States. Created by Erin Greb. ...


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