Did Streambank Fencing Affect Shallow Ground-Water Quality?
Differences in shallow ground-water flow paths were at least partly responsible for the large differences in chemistry and physical characteristics between the two well pairs. Dissolved-nitrate concentrations at the T-2 well nest were about one order of magnitude higher than for the T-1 well nest (table 6). Low dissolved-nitrate concentrations at the T-1 well nest were partially attributable to denitrification. Other differences between shallow wells at T-1 and T-2 were evident for dissolved ammonia and P, but in this case, concentrations were higher for the T-1 well nest. One similarity between the well nests was the relative decrease in water temperature during the post-treatment period. Table 6. Mean values for shallow ground-water samples collected during the pre- and post-treatment periods at the two well nests in the treatment basin and percentage change for treatment wells relative to control wells during the post-treatment period based on analysis of covariance for shallow well
