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Last modified
4/17/2013 9:19:01 AM
Creation date
6/10/2008 11:59:47 AM
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Decision Support Systems
Title
SPDSS Task 39 - Final Water Measurement - Phase 4
Description
This technical memorandum documents the methods and results of Task 39, and focuses on field data collection with limited analysis provided.
Decision Support - Doc Type
Task Memorandum
Date
5/20/2008
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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In June 2006 a Colorado licensed surveyor obtained the 1lorizontal coordinates and vertical <br />elevations of each well's measur>11g points for 22 wells. T11e results of the surveying and <br />photographs of the measuring points surveyed are presented in Appendix F, and locations of <br />the surveyed wells are shown in Figure 11. <br />Of the 22 locations surveyed, 15 already had elevation data available from the DWP for their <br />measuring point; all of these are alluvial wells. Table 7 compares the surveyed measuring point <br />against the existing DWR measuring point elevation. Of the 151ocations where previous <br />elevation data were available, the average difference between the surveyed and DWR elevation <br />is 4.6 feet and two locations 11ad surveyed elevations greater than ten feet compared to the <br />previous elevation value. Using a statistical quartile analysis, 25 percent of t11e data Have <br />differences between existing and surveyed elevations less than or equal to 3.2 feet, 50 percent of <br />the data have differences less than or equal to 3.9 feet, and 75 percent of the data Have <br />differences less than or equal to 5.6 feet. These differences are large with respect to the very <br />low hydraulic gradients present in the study area. As an example of the potential effect of this <br />measuring point error, consider t11at typical gradients observed in t11e alluvium of t11e South <br />Platte River range from 10 to 20 feet per mile. If the groundwater level elevation from just one <br />of two wells a nine apart is in error by 3.9 feet, this would result in the gradient being off by 20 <br />to 40 percent, which would also proportionally affect the groundwater flux estimate in the area. <br />Table 7: Comparison of Surveyed and Existing Elevation <br />Data for Wells in the DWR Monitoring Program <br /> <br /> <br />Well Name Surveyed Measuring <br />Point Elevation <br />Ft NAVD88 DWR Measuring <br />Point Elevation <br />Ft <br /> <br />Difference <br />04N6506DAB 4689.52 4685.0 4.5 <br />04N6518DAA 4706.66 4710.0 -3.3 <br />04N6614BAA 4728.93 4725.0 3.9 <br />04N6627ADD 4759.08 4755.0 4.1 <br />KB-1 4679.17 4679.0 0.2 <br />KB-2 4693.25 4690.0 3.3 <br />KB-4 4700.98 4697.0 4.0 <br />KB-12 4645.20 4642.0 3.2 <br />KB-13 4664.63 4658.0 6.6 <br />KB-14 4673.70 4672.0 1.7 <br />N-11 4722.05 4712.0 10.1 <br />N-7 4646.48 4650.0 -3.5 <br />N-8 4632.57 4631.0 1.6 <br />S-3 4721.79 4715.0 6.8 <br />5-18 4737.42 4725.0 12.4 <br />SPDSS Phase 4 Task 39 Technical Memorandum-Final 21 <br />O~i20%2008 <br />
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