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Changes in Ground Water Quality in an Irrigated Area of Southern Alberta

^a Irrigation Branch, Alberta Agriculture, Food and Rural Development, Agriculture Center, 100, 5401 First Avenue South, Lethbridge, AB, T1J 4V6 Canada
^b Department of Geology and Geophysics, University of Calgary, Calgary, AB, T2N 1N4 Canada

View larger version (28K): [in a new window]   Fig. 1. The study area in the eastern portion of the Lethbridge Northern Irrigation District.

View larger version (76K): [in a new window]   Fig. 2. A portion of the study area in cross-section (labeled A–A' in Fig. 1) showing (a) geology and hydrogeology and (b) 18O signatures and lower limit of tritium detection.

View larger version (23K): [in a new window]   Fig. 3. Nitrate and chloride concentrations with depth in 2001. Different symbols represent different piezometer nests, except for squares, which indicate nests represented by a single piezometer in that group.

View larger version (21K): [in a new window]   Fig. 4. Median nitrate and chloride in 2001 with agricultural intensity in (a) coarse-textured and (b) fine-textured sediments.

View larger version (21K): [in a new window]   Fig. 5. Nitrate vs. chloride concentrations in coarse-textured sediments in 2001.

View larger version (43K): [in a new window]   Fig. 6. Geometric mean nitrate and chloride concentrations with time. Bars indicate standard error of means. Number of samples is shown above the lines, and dates with the same letter below the lines are not significantly different.

View larger version (24K): [in a new window]   Fig. 7. Ion concentrations with time at a 5-m piezometer at the coarse-textured manure plots. Significantly increasing concentrations based on linear regression are indicated.