Ogallala-High Plains Aquifer

Equus Beds (GMD2)

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Equus Beds GMD 2
  • Formed: 1975
  • Office location: Halstead
  • Counties/partial counties: McPherson, Reno, Harvey, Sedgwick
  • Boundary changes: District expanded December 20, 1988 adding much of eastern Reno County
  • Square miles: 1,373 (GMD2 data)
  • Acres: 500,480 (1975 management program); 878,720 (GMD2 data)
  • Irrigated acres: 143,178 (WRIS 2011-2015 average)
  • Authorized acres: 27,000 (1975 management program); 197,642 (WRIS 2017)
  • Wells: 500 (1975 management program); 3,260 groundwater points of diversion (WRIS 2017)
  • Average precipitation: 27 to 33 inches/year (1975 management program); 31 to 34 inches/year (1981-2012 normals)
  • Reported water use: 187,432 AFY total (128,814 AFY irrigation, 69% of total) (WRIS 2011 - 2015 average)



The High Plains aquifer components in Kansas are made up of the Ogallala, Great Bend Prairie, and Equus Beds regions as shown on the map below.

The High Plains aquifer underlies about 174,000 square miles of the central United States. It falls east of the Rocky Mountains in the southern part of the Great Plains. The aquifer underlies portions of eight states. They include South Dakota, Wyoming, Nebraska, Colorado, Kansas, Oklahoma, New Mexico and Texas. The High Plains aquifer is the shallowest and most abundant source of water in the region.

Extent of the High Plains Aquifer