Laserfiche WebLink
The observation wells can be subdivided into two types: those which lie within or very near <br />the South Platte River floodplain, and those located in tributary valleys. The number of <br />observation wells in tributary valleys exceeds the number along the South Platte floodplain <br />by 21. <br />An evaluation of the data of beginning water levels as compared to Spring 1997 levels reveals <br />that approximately 60.3% of the wells have experienced a water level decline which <br />compares to a 43.5% decline in the 1996 report. By comparison, 27% of the wells <br />experienced a rise in the Spring 1997 as compared to the Spring 1988 water level. This <br />percentage is considerably greater than the 1996 report value 0 5.7%). Declines of Spring <br />1988 to Spring 19.97 range from - 0.23' to - 18.63' as compared to the range of 0.25' to <br />29.80' in the 1996 report. Declines on the order of 0.01' are insignificant in that such <br />changes can be caused by wind, earth movement, and the effect of evapotranspiration and <br />phreatic consumption or maybe errors in data recording. The table following this narrative <br />entitled "Table of Water Level Trends of the South Platte Alluvium through Spring 1997" <br />recaps the statistics to date for this ongoing report in terms of all wells, tributary valleys, and <br />the South Platte main stem/floodplain. <br />These data also reveal that the averages of the water level changes from Spring 1988 to <br />Spring 1997 wells within the tributary valleys (both rises and declines) are greater than the <br />averages of the South Platte floodplain alluvium. By comparison, in 1996 the average rise of <br />Spring 1988 vs. Spring 1996 changes in the tributary valleys were greater than those in the <br />South Platte floodplain, while the average decline in the tributary valleys were less than the <br />average decline of the main stem. <br />-2- <br />