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SPDSS_Task44-3_LowerSPlatteAlluviumRegionAquiferWaterLevels
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SPDSS_Task44-3_LowerSPlatteAlluviumRegionAquiferWaterLevels
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Last modified
4/17/2013 9:26:17 AM
Creation date
6/11/2008 1:35:24 PM
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Decision Support Systems
Title
SPDSS Task 44.3 - Lower South Platte Alluvium Region Aquifer Levels - Phase 3
Description
This Technical Memorandum was undertaken under Task 44.3 of Phase 2 of the SPDSS, and summarizes the compilation, analysis and mapping of water level data of the South Platte Alluvial Aquifer.
Decision Support - Doc Type
Task Memorandum
Date
11/29/2006
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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The well locations for which water level data was available in the selected year are posted on <br />each figure. Some time periods have substantially more water level data than others. <br />As shown in Figure 4, in 1968 there were a relatively large number of water level measurement <br />locations available for contouring in the South Platte Alluvium Region. This large data set is <br />due to an extensive USGS monitoring program undertaken in 1968. For this year, 1,390 water <br />level measurements were used for contouring (Table 2). This distribution provides for a clearly <br />defined water level surface in the alluvial aquifer, including Cache la Poudre, Beaver and <br />Badger Creeks. The water level elevations and trends developed in this study are consistent <br />with the water levels and trends presented by Hurr and Schneider (1972a-1972f), except near Ft. <br />Morgan and at the edges of the alluvium along the mainstem. The dataset used to develop the <br />Hurr and Schneider (1972a-1972f) contours are not available, so it is concluded that the <br />differences in water level surfaces represent a combination of different datasets and contouring <br />methodologies. The shape of the groundwater surface contours indicate that groundwater flows <br />toward and discharges at the river, but also has a strong component of flow down-valley. The <br />water level elevation in the upstream (north of Denver) portion of the South Platte Alluvium <br />Region is 5,100 feet, 15 feet below land surface and decreases to an elevation of 3,450, 20 feet <br />below land surface near the Colorado-Nebraska state line. Water level elevations in the Cache la <br />Poudre range from approximately 5,400 feet, 25 feet below land surface, north of Ft. Collins to <br />approximately 4,600 feet, 25 feet below land surface at the confluence with the South Platte <br />River. <br />As shown in Figure 5, water level measurements in 1978 were not as abundant along the <br />mainstem as in 1968. A majority of the measurements (795; Table 2) were centered on Badger <br />and Beaver Creeks in southern Morgan County. Other measurements are located at irregular <br />intervals along the mainstem of the South Platte River extending to the state line. The overall <br />water level gradients in the mainstem of the South Platte and its tributaries are consistent with <br />the 1968 gradients with local rises in the water table along the mainstem in southwestern Logan <br />County. A majority of the differences can be attributed to the density of data in a given area <br />particularly in Beaver and Badger Creeks and along the mainstem of the South Platte <br />downstream of Ft. Morgan. The water level elevations near Ft. Morgan are approximately 4,275 <br />feet, 35 feet below land surface and decrease to the northeast at the state line with an elevation <br />of 3,450 feet, 20 feet below land surface. The water level elevations in the Cache la Poudre in <br />1978 are similar to those in 1968. <br />A water level surface similar to the preceding time periods is seen in 1990 (Figure 6). Data for <br />this time period was relatively sparse compared with previous periods, with 377 water level <br />measurements available for contouring (Table 2). These measurements are distributed spatially <br />throughout the region, although there are large areas with no measurements. Since there were <br />few data points for this time period, the water level contours are based more heavily on the <br />stream bed control points, discussed in Section 1.3. These control points were inserted on a <br />regular 5-mile interval along the mainstem of the South Platte River from Ft. Lupton to <br />Julesburg. These control points provide additional water level data in an alluvial system where <br />the stream is hydraulically connected with the river. These control points maybe slightly higher <br />or lower than the water table depending on if the river appears to be gaining or losing flow to <br />SPDSS Phase 3 Task 44.3 TM -Final 12 <br />11/29/2006 <br />
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