overburden

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Data for the overburdens showed very different correlations with media properties than data for the soils.
For example, the correlations with clay content at 5% and 30% slope for the overburdens are similar, at 0.
Increasing rock content was consistently correlated with decreasing erosion rates, at all slopes and for both soils and overburdens.
The correlations with properties for soils, overburdens, and soils and overburdens together are listed in Table 5.
Correlation coefficients between media properties and rill erodibility calculated from Eqn 6 for soils, overburdens, and soils and overburdens together
Overburdens containing [is greater than] 30% of competent rock can therefore be considered to be relatively stable with respect to rill erosion--at least for the flow conditions tested in this study.
Table 6 shows the correlations between erodibility (rill and interill) and texture size classes for soils and overburdens.
Tabulated values represent the correlation coefficient between erodibility and the particle size interval for overburdens (above diagonal) and soils (below diagonal) given by the column and row headings.