Geology and occurrence of ground water in Otero County, and the southern part of Crowley County, Colorado

Weist, William G.; Jenkins, Edward D.; Horr, C.A.

doi:10.3133/wsp1799

Cited by 4 publications

References 10 publications

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Data Requirements and Preliminary Results of an Analog‐Model Evaluation—Arkansas River Valley in Eastern Colorado^a

Moore

Wood

1967

Groundwater

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The intensively irrigated Arkansas River Valley in Colorado is underlain by a valley‐fill aquifer resting in a U‐shaped trough cut in relatively impermeable Cretaceous rocks. Ground water is pumped to supplement surface water; in the last 10 years pumping has more than doubled. Ground water is closely related to the Arkansas River; percolation from irrigation recharges the aquifer, which discharges into the river. Pumping has resulted in a reduction in streamflow because it intercepts water that ordinarily would have reached the river. The 1,500 irrigation wells in the Arkansas Valley withdrew 230,000 acre‐feet of water in 1964. An analog model is being used to evaluate the relation of ground water to surface water and to predict effects of changes in water management. The model, simulating a 150‐mile reach of the Arkansas Valley (Pueblo to the State line), has a resistor spacing of 8 per modeled mile. The framework for the model was a transmissibility map; transmissibility ranges from less than 50,000 to 700,000 gallons per day per foot. Specific yield averages about 0.2. Hydrologic boundaries, such as the Arkansas River, and the bedrock valley‐fill contact were simulated. Applied water, precipitation, evapotranspiration, and ground‐water pumping were the independent variables programed. The model is being verified by comparing predicted changes in water level and river discharge with observed changes.

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Data Requirements and Preliminary Results of an Analog‐Model Evaluation—Arkansas River Valley in Eastern Colorado^a

Moore

Wood

1967

Groundwater

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Triassic fossils found stratigraphically above 'Jurassic' eolianites necessitate the revision of lower Mesozoic stratigraphy in Picket Wire Canyonlands, south-central Colorado

Heckert¹,

Sload²,

Lucas³

et al. 2012

Rocky Mountain Geology

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Changes in ground-water levels in selected wells in the Arkansas River alluvial aquifer downstream from Pueblo Reservoir, southeastern Colorado, 1965-2001

Steger¹

2002

Fact Sheet

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The Arkansas River alluvial aquifer of Quaternary age underlies the Arkansas River in southeastern Colorado (fig. 1). The aquifer is 1 to 6 miles wide and extends about 150 miles from Pueblo County through Otero, Crowley, Bent, and Prowers Counties to the Colorado-Kansas State line (figs. 6-9). The aquifer is hydraulically connected to the Arkansas River and is underlain by relatively impermeable bedrock of Cretaceous age. The aquifer is as much as 200 feet thick and consists of unconsolidated clay, silt, sand, and gravel. Depth to water generally is less than 60 feet below land surface (Voegeli and Hershey, 1965; Weist, 1965; Lohman and others, 1974). The U.S. Geological Survey (USGS) has measured water levels in wells completed in the Arkansas River alluvial aquifer since about 1965 for various programs. Currently (2002) the USGS measures water levels during the spring and fall of each year in 35 wells in the aquifer, in cooperation with the Southeastern Colorado Water Conservancy District (SECWCD) (figs. 6-9). Long-term, systematic water-level measurements are needed to monitor stresses on the aquifer that affect recharge and ground-U.

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Geology and occurrence of ground water in Otero County, and the southern part of Crowley County, Colorado

Abstract: Previous work___________________________ _ 2 Methods of investigation_ 3 Well-numbering system____ 4 Acknowledgments.

Cited by 4 publications

References 10 publications

Data Requirements and Preliminary Results of an Analog‐Model Evaluation—Arkansas River Valley in Eastern Colorado^a

Data Requirements and Preliminary Results of an Analog‐Model Evaluation—Arkansas River Valley in Eastern Colorado^a

Triassic fossils found stratigraphically above 'Jurassic' eolianites necessitate the revision of lower Mesozoic stratigraphy in Picket Wire Canyonlands, south-central Colorado

Changes in ground-water levels in selected wells in the Arkansas River alluvial aquifer downstream from Pueblo Reservoir, southeastern Colorado, 1965-2001

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Geology and occurrence of ground water in Otero County, and the southern part of Crowley County, Colorado

Abstract: Previous work_________________________________ ___________ 2 Methods of investigation_______________________________________ 3 Well-numbering system______________________________________ 4 Acknowledgments.

Cited by 4 publications

References 10 publications

Data Requirements and Preliminary Results of an Analog‐Model Evaluation—Arkansas River Valley in Eastern Coloradoa

Data Requirements and Preliminary Results of an Analog‐Model Evaluation—Arkansas River Valley in Eastern Coloradoa

Triassic fossils found stratigraphically above 'Jurassic' eolianites necessitate the revision of lower Mesozoic stratigraphy in Picket Wire Canyonlands, south-central Colorado

Changes in ground-water levels in selected wells in the Arkansas River alluvial aquifer downstream from Pueblo Reservoir, southeastern Colorado, 1965-2001

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Abstract: Previous work___________________________ _ 2 Methods of investigation_ 3 Well-numbering system____ 4 Acknowledgments.

Data Requirements and Preliminary Results of an Analog‐Model Evaluation—Arkansas River Valley in Eastern Colorado^a

Data Requirements and Preliminary Results of an Analog‐Model Evaluation—Arkansas River Valley in Eastern Colorado^a