Abstract
This paper presents an analysis of the impact of a flood control reservoir on the downstream concentrations and loadings of nitrite plus nitrate N and orthophosphate (soluble nutrients). Fifteen years of weekly sampling data (9 yr before impoundment and 6 yr thereafter) from four sampling stations were analyzed. The results indicate an increase in the annual average concentrations of nitrite plus nitrate N. These increases varied from 4 to 34%. The changes in orthophosphate concentrations were more modest. Annual loading rates of both parameters (kg ha−1 yr−1) correlated well with runoff (cm yr−1). A comparison of the leading rate correlations for all four sampling stations showed that the differences between them are not significant at the 95% level of confidence. Besides, the reservoir was shown to have had no significant impact on the average annual loading rates of these two soluble parameters at downstream locations.
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Okereke, V.I., Baumann, E.R., Al Austin, T. et al. Midwest (U.S.A.) reservoir water quality modification. Water Air Soil Pollut 37, 343–354 (1988). https://doi.org/10.1007/BF00192945
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DOI: https://doi.org/10.1007/BF00192945