Mission 2012 Clean Water Map, Historical geography, History geography

Midwest Aquifer Map. What is the difference between a confined and an unconfined (watertable) aquifer? — USGS The source data for the map were groundwater-altitude data from wells measured manually or continuously generally in spring 2020 and from the altitude of the top of the water surface measured generally on April 9, 2020, in rivers in the area. 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 wells and springs.The areal and vertical location of major aquifers is fundamental to the determination of groundwater availability for the Nation

Access the Interactive Map of Sole Source Aquifers Includes geology, groundwater, pollution sensitivity, and special studies.

What Is An Aquifer?

An aquifer is a geologic formation (rock, gravel, or sand) that contains useable amounts of groundwater and can contribute that water to wells, springs, lakes, or streams. National Geographic Information Systems (GIS) layer of SSAs 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)

Aquifer Map. The purpose of this report is to present a potentiometric-surface map for the Mississippi River Valley alluvial aquifer (MRVA) 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

Drought and Overuse Plague a Critical U.S. Aquifer. Access the Interactive Map of Sole Source Aquifers A national layer, including all available SSA coverages, is available for use in GIS.