Laserfiche WebLink
<br />coefficient of 0.37; (2) station 07106300 (Fountain Creek near Pinon) corre- <br />lated with three different precipitation stations (7315, 8434, and 8781) with <br />the highest correlation coefficient of 0.57; (3) three streamflow-gaging <br />stations in the upper basin (07079500, 07081000, and 07089000) correlated with <br />precipitation station 8064 (Sugarloaf Reservoir); and (4) station 07137500 <br />(Arkansas River near Coolidge) correlated with precipitation station 6741 <br />(Pueblo) for over 10 years of concurrent record with a correlation coefficient <br />of 0.53. <br /> <br />A statistical analysis to compute the correlation coefficients of annual <br />mean discharge and the April 1 snowpack for every combination of streamflow- <br />gaging stations and snow-survey courses was performed. About 22 percent of <br />the computed correlation coefficients between stations with concurrent record <br />were statistically different from zero at the I-percent significance level. <br />The best correlation coefficient was 0.85. About 1 percent of the correlation <br />coefficients was greater than 0.80; another 6 percent was greater than 0.70; <br />and an additional 7 percent was greater than 0.60. Most of the well- <br />correlated combinations were the main-stem and tributary streamflow-gaging <br />stations in the upper basin with the snow-survey courses in that area. The <br />diminishing relation as one moves downstream can be seen by the fact that <br />stations 07091500 (Arkansas River at Salida) and 07096000 (Arkansas River at <br />Canon City) had correlation coefficients statistically different from zero at <br />the I-percent significance level with 13 different snow-survey courses; <br />station 07099500 (Arkansas River near Pueblo) with 11 snow-survey courses; <br />station 07117000 (Arkansas River near Nepesta) with 10 snow-survey courses; <br />station 07119700 (Arkansas River at Catlin Dam) with 7 snow-survey courses; <br />and as far downstream as station 0712400 (Arkansas River at Las Animas) with <br />2 snow-survey courses. The relation between the annual mean discharge at six <br />selected streamflow-gaging stations and the April 1 snowpack at snow-survey <br />course 6L08 (Garfield) is shown in figure 97. The lines banding the data are <br />the 95-percent confidence limits of correctly predicting annual mean discharge <br />for any given April 1 snowpack. As the confidence limits expand, the expected <br />accuracy of the regression relation for making predictions decreases. <br /> <br />Ground-Water Levels <br /> <br />Wells where ground-water levels have been measured were selected, based <br />on length of record and geographic location. The 37 wells chosen are shown on <br />plate 1 and listed in table 9. Selected wells were limited to those <br />penetrating the valley-fill deposits (111VLFL in table 9); the alluvial flood <br />plains (111ALFP); the terrace deposits (112TERC) along the Arkansas River and <br />Fountain Creek; the glacial deposits (112GLCL); and the basin-fill deposits <br />(121DRUN) in the upper basin. Hydrographs of the depth-to-water for these <br />37 wells are shown in figures 98-134. Tables of the instantaneous water <br />levels are presented in the "Supplemental Information" section at the end of <br />the report. <br /> <br />68 <br />