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gptkbp:instanceOf
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gptkb:reservoir
|
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gptkbp:alsoKnownAs
|
gptkb:Ogallala_Aquifer
|
|
gptkbp:area
|
about 174,000 square miles
|
|
gptkbp:composition
|
sand, gravel, clay, silt
|
|
gptkbp:conservationEfforts
|
crop rotation
regulatory measures
water-saving irrigation technologies
|
|
gptkbp:currentWaterVolume
|
significantly reduced from predevelopment
|
|
gptkbp:declinedAfter
|
over-extraction
|
|
gptkbp:discoveredBy
|
late 19th century
|
|
gptkbp:estimatedWaterVolume
|
about 2.9 billion acre-feet (predevelopment)
|
|
gptkbp:firstMajorIrrigation
|
1940s
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|
https://www.w3.org/2000/01/rdf-schema#label
|
High Plains Aquifer
|
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gptkbp:importantFor
|
critical for U.S. agriculture
|
|
gptkbp:locatedIn
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gptkb:United_States
gptkb:Great_Plains
|
|
gptkbp:mainCrops
|
gptkb:wheat
corn
cotton
sorghum
alfalfa
|
|
gptkbp:managedBy
|
various state and local agencies
|
|
gptkbp:maximumDepth
|
varies from a few feet to over 1,000 feet
|
|
gptkbp:namedAfter
|
gptkb:Ogallala_Formation
|
|
gptkbp:notableCity
|
gptkb:Amarillo,_Texas
gptkb:North_Platte,_Nebraska
gptkb:Lubbock,_Texas
gptkb:Ogallala,_Nebraska
gptkb:Garden_City,_Kansas
|
|
gptkbp:primaryUse
|
drinking water
irrigation
|
|
gptkbp:receivesWaterFrom
|
over 2 million people
one-fifth of U.S. irrigated land
|
|
gptkbp:rechargeRate
|
much lower than extraction rate
|
|
gptkbp:rechargeSources
|
precipitation
surface water infiltration
|
|
gptkbp:studiedBy
|
gptkb:U.S._Geological_Survey
|
|
gptkbp:threats
|
climate change
contamination
depletion
|
|
gptkbp:underlies
|
gptkb:Colorado
gptkb:Kansas
gptkb:Nebraska
gptkb:New_Mexico
gptkb:Oklahoma
gptkb:South_Dakota
gptkb:Texas
gptkb:Wyoming
gptkb:Nebraska_Sandhills
parts of eight states
|
|
gptkbp:waterLevelDecline
|
up to 150 feet in some areas
|
|
gptkbp:waterTableDecline
|
significant since 1940s
|
|
gptkbp:bfsParent
|
gptkb:Ogallala_Aquifer
|
|
gptkbp:bfsLayer
|
6
|