An aquifer is defined as a geologic formation that is sufficiently water-saturated and permeable to yield a significant quantity of water to wells or springs. The aquifer systems of the Horse Creek subbasin are shown on the map below. Aquifer systems currently used and/or available for future development within the subbasin include the following:
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Quaternary Aquifer System (Alluvial deposits);
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Quaternary Aquifer System (Non-alluvial deposits);
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Late Tertiary Aquifer System (Ogallala, Arikaree Formations, White River Group);
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Late Cretaceous Aquifer Systems (Lance Formation and Fox Hills Sandstone);
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Late Paleozoic Aquifer System (Casper Formation); and
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Precambrian Aquifer System (Precambrian crystalline bedrock units).
The Quaternary and Late Tertiary Aquifer Systems are the most extensively developed aquifer systems in the Horse Creek subbasin.