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7/22/2021 1:58:23 PM
Creation date
3/21/2019 11:19:23 AM
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Reference Library
Title
HYDROGEOLOGY AND WATER RESOURCES OF THE SOUTHERN HIGH PLAINS DESIGNATED GROUND WATER BASIN: PHASE 2 STUDY
Author/Source
MCLAUGHLIN WATER ENGINEERS, LTD.
Keywords
BACA AND PROWERS COUNTIES, SOUTHERN HIGH PLAINS GROUND WATER MANAGEMENT DISTRICT, JOB NO. 99-02800300, HYDROGEOLOGY; BASIN DESIGNATION REPORT
Document Type - Reference Library
Investigations and Studies
Document Date
1/1/2002
Year
2002
Team/Office
Water Supply
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in both the Quaternary alluvium and the Dockum Aquifer. The Dockum is reported to be <br />the aquifer penetrated by some wells in north -central Baca county, but not described in <br />the outcrops near Two Buttes. Thus, the Dockum appears to be an extensive and fully <br />saturated aquifer in the north and southwest and in most of the southeast portions of the <br />Basin, except where it is exposed on the Cimarron River. The aquifer has not been <br />developed under most of the central part of Baca County. As shown in the cross- <br />sections, this lack of development is probably because the aquifer is much deeper than <br />the Dakota Aquifer and the Dakota Aquifer yields are still adequate for irrigation. The <br />Dockum may contain significant undeveloped ground -water reserves. Most wells in the <br />southeast part of the Basin are completed in the Dockum Aquifer. Many wells are drilled <br />and cased with perforations through the High Plains Aquifer, and drilled 100 to 350 or <br />more feet into the Dockum Aquifer with open -hole completions. <br />Where examined, the Dockum appears to be fully saturated except in the southern part <br />of T. 31 S., R. 42 W. and the adjacent northern part of T. 32 S., R. 42 W., where the <br />water level is over 100 feet below the top of the formation, and the Dockum is shallow. <br />This is an area of significant irrigation. All other penetrations of the Dockum by monitor <br />wells, both where it is overlain by the High Plains, and by the Dakota, have measured <br />water levels above the top of the Dockum. <br />The Dockum is the deepest aquifer unit in the Basin. As previously described, it is <br />hydraulically connected to the highest formation, the Ogallala, at least in the <br />southeastern part of the District, by virtue of the fact that the intervening formations all <br />pinch out. Because of its depth it has the fewest exposures, is least penetrated by <br />drilling and is the least understood. Generally called a "red bed" due to the oxidized <br />nature of the sediments, the formation changes facies to the east in Kansas, where it is <br />no longer considered an aquifer, but is included in the Permian aquitard. This facies <br />change may have the effect of forming a stratigraphic trap within the Dockum Group and <br />prevent the lateral migration of ground -water in a southeasterly direction. This may <br />explain in part the recharge of the Ogallala Formation by the Dockum in a southeasterly <br />direction as shown on Cross-sections A — A' and C — C'. Another hypothesis is that the <br />upper Dockum is the better aquifer and it is truncated by pre Jurassic erosion that left <br />only the lower, and less porous facies present to the east. Further study is necessary to <br />establish these relationships. <br />Based upon the unknown nature of the lower Dockum, this study considers the water <br />resource within the upper approximately 200 feet to be "proven", and the water resource <br />in the lower 100 to 500 feet of the formation to be "possible". Deeper drilling and testing <br />will be required to evaluate this lower reserve. <br />VI 11 <br />99-028.003\Phase 2 Report\Hydrogeology <br />
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