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SPDSS_Task42-3_Phase3_LowerSPlatteAlluviumRegionAquiferConfiguration
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SPDSS_Task42-3_Phase3_LowerSPlatteAlluviumRegionAquiferConfiguration
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Last modified
4/17/2013 9:20:41 AM
Creation date
6/11/2008 10:36:35 AM
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Decision Support Systems
Title
SPDSS Task 42.3 - Lower South Platte Alluvium Region Aquifer Configuration - Phase 3
Description
This Technical Memorandum was undertaken under Task 42.3, and summarizes the compilation, analysis and mapping of existing published aquifer configuration data for the Lower South Platte Alluvium Region.
Decision Support - Doc Type
Task Memorandum
Date
11/30/2006
DSS Category
Groundwater
DSS
South Platte
Basin
South Platte
Contract/PO #
C153953
Grant Type
Non-Reimbursable
Bill Number
SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
Prepared By
CDM
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edge, there is a small channel located where the Beebe Draw Alluvium converges with the <br />South Platte Alluvium. <br />Cross section B-B', shown in Figure 13, is located near Kersey at the Kersey gaging station. This <br />cross section depicts more of an incised paleochannel than A-A' but still lacks the steep banks <br />seen in downstream cross sections. The bedrock surface is nearly flat along the northern edge, <br />rolls into the valley bottom, which extends for over a mile, and then rises steeply in the south. <br />Cross section C-C', shown in Figure 14, is located just upstream of Fort Morgan. The deepest <br />part of the alluvial paleochannel is approximately one-half mile wide and then broadens out <br />and extends for a total width of nearly 7 miles. On the left (north) side of the cross section, the <br />bedrock surface at an elevation of approximately 4,175 feet and between distance markers 1 and <br />2 shows a smaller channel eroded into the bedrock surface. This likely represented the location <br />of the ancestral South Platte River at an earlier time. <br />Cross section D-D', shown in Figure 15, is located downstream of Brush near the Balzac stream <br />gage. It shows a narrow, incised valley bottom approximately 1 mile wide and deepens to 3,900 <br />feet. Above an elevation of approximately 4,050 feet, but still almost 70 feet below the water <br />table surface, on the south side of the valley bottom, the slope of the bedrock surface is nearly <br />flat and extends out approximately 3 miles. This could represent the bottom elevation of the <br />river channel at the end of a particular cycle of glaciation, when the river meandered into and <br />eroded away the bedrock in the area of this bench. On the north side, the slope on the bedrock <br />surface is much steeper and only extends approximately 1 mile from the valley bottom. The <br />water table in this region is at approximately 4,100 feet. <br />Cross section E - E', shown in Figure 16, is located near the Town of Sterling. Compared to <br />Cross section D-D', which is approximately 25 miles to the southwest, the valley bottom shows <br />gentler side slopes. The elevation of the valley bottom has decreased by 200 feet from Cross <br />section D-D' to approximately 3,700 feet, and the water table has also decreased by <br />approximately 200 feet to 3,900 feet. <br />Cross section F-F', shown in Figure 17, is located between the Towns of Sterling and Julesburg <br />in northeastern Logan County. At this location, the valley bottom is wider than at upstream <br />locations, and contains a deep channel underneath a ground surface high. The slope of the <br />bedrock surface on the south side of the valley bottom is much steeper than at Cross section D- <br />D', whereas the slope on the north side is similar to Cross section E-E'. As with Cross section D- <br />D', the bedrock surface is asymmetric, but the steeper side is on the south valley wall. The <br />valley bottom and water table elevations again decreased by approximately 200 feet from Cross <br />section E-E'. <br />4.0 Summary and Conclusions <br />CDM has completed SPDSS Tasks 31 and 42, the Phase 1, 2, and 3 collection, analysis, and <br />mapping of aquifer configuration data for the South Platte Alluvium Region. This report <br />examines the sources and types of available alluvial aquifer configuration data during Phases 1, <br />2, and 3 of the SPDSS. It describes the processing of the data used to generate a grid of the <br />bottom of the alluvium, a grid of the water level surface, a grid of the saturated thickness, and a <br />SPDSS Phase 3 Task 42.3 TM -Final 14 <br />11/30/2006 <br />
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