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Correlations between Rain and Runoff Amounts and Composition in Eastern South Dakota
Author(s) -
White E. M.,
Williamson E. J.,
Kingsley Q.
Publication year - 1977
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1977.00472425000600030003x
Subject(s) - surface runoff , antecedent moisture , hydrology (agriculture) , environmental science , runoff curve number , watershed , geology , ecology , biology , geotechnical engineering , machine learning , computer science
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 PO 4 ‐P, NO 3 ‐N, NH 4 ‐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 PO 4 ‐P and NO 3 ‐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 PO 4 ‐P and NO 3 ‐N losses on other watersheds in eastern South Dakota.