Correlations between Rain and Runoff Amounts and Composition in Eastern South Dakota
1977
White, E. M. | Williamson, E. J. | Kingsley, Q.
A correlation between a synthesized rainfall-intensity factor and runoff from small plots with sparse cover was significant but explained less than half the variation in the data. Loss of PO₄-P, NO₃-N, NH₄-N, and K in runoff was significantly correlated to the runoff amounts, and the regression explained about 50 to 75% of the variation in the data. The unexplained variation in the regressions probably is due to antecedent plot conditions, such as the soil and the plant cover growth or decomposition stage. Time since an antecedent rain was not significantly related to runoff. Average runoff volumes and average losses of PO₄-P and NO₃-N per runoff event from different-sized cultivated areas for 2- to 5-year periods had a highly significant correlation. The regressions, based on runoff volume and not on watershed size, apparently could estimate PO₄-P and NO₃-N losses on other watersheds in eastern South Dakota.
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