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The Ogallala Aquifer (oh-gə-LAH-lə) is a shallow water table aquifer surrounded by sand, silt, clay, and gravel located beneath the Great Plains in the United States. As one of the world's largest aquifers, it underlies an area of approximately 174,000 sq mi (450,000 km 2) in portions of eight states (South Dakota, Nebraska, Wyoming, Colorado, Kansas, Oklahoma, New Mexico, and Texas). [1]
Aquifers of the United States Withdrawal rates from the Ogallala Aquifer.. This is a list of some aquifers in the United States.. Map of major US aquifers by rock type. An aquifer is a geologic formation, a group of formations, or a part of a formation that contains sufficient saturated permeable material to yield significant quantities of water to groundwater wells and springs.
The greatest threat to the Blue River is the withdrawal of water for human use from the Arbuckle-Simpson Aquifer. Withdrawal exceeds recharge which reduces the flow of the river. In 2011, to help protect the aquifer and the land, the Nature Conservancy purchased 490 acres of land along the river near Connerville.
The Ogallala aquifer is the principal source of water for agriculture in western Kansas. ... The Ogallala Aquifer was formed more than 25,000 years ago, but it recharges at a very low rate. For ...
Aquifers of the United States are organized by national principal aquifer codes and names assigned by the National Water Information System (NWIS). Aquifers are identified by a geohydrologic unit code (a three-digit number related to the age of the formation) followed by a 4 or 5 character abbreviation for the geologic unit or aquifer name. [10]
The published maps contain base and cultural features not included in these data. This is a replacement for the July 1998 map layer called Principal Aquifers of the 48 Conterminous United States. Purpose: These data are intended for use in publications, at a scale of 1:2,500,000 or smaller.
Figure 1. This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS.. The following are the principal and guide meridians and base lines of the United States, with the year established and a brief summary of what areas' land surveys are based on each.
Oklahoma has 41 state parks, two national protected forests or grasslands, [12] and a network of wildlife preserves and conservation areas. Six percent of the state's 10 million acres (40,000 km 2 ) of forest is public land, [ 11 ] including the western portions of the Ouachita National Forest , the largest and oldest national forest in the ...