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Table 4.4-4. Calculation of historic herbaceous cover on premine range sites A, B, and <br /> C and corresponding confidence interval. <br /> Range x annual _ <br /> Site Year % cover x q Calculated confidence interval <br /> A 1979 23.0 .56 .44 y= .9 x+ 5n, a .1 (z q)In) <br /> 1980 34.7 <br /> 1981 69.8 y= .9(.56) + (1.895)(.1876) <br /> 1982 75.2 <br /> 1983 54.9 y= 14.85% cover <br /> 1984 74.5 <br /> 1985 59.9 Based upon the USLE, 14.85% cover is <br /> insufficient to control excessive soil erosion. (1) <br /> B 1979 22.0 .482 .518 y= .9'x±tn, a .1 (z q)In) <br /> 1980 40.6 <br /> 1981 53.2 y= .9(.482) +_(1.895)(.1887) <br /> 1982 51.2 <br /> 1983 54.3 y= 7.62% cover <br /> 1984 65.1 <br /> 1985 51.1 Based upon the USLE, 7.62% cover is <br /> insufficient to control excessive soil erosion. (1) <br /> A 1979 23.6 .488 .512 y= .9 z±5n, a .1 (z q)In) <br /> 1980 26.2 A <br /> 1981 59.8 y= .9(.512) + (1.895)(.1889) <br /> 1982 68.4 A. <br /> 1983 61.3 y= 10.28% cover <br /> 1984 49.4 <br /> 1985 52.7 Based upon the USLE, 10.28% cover is <br /> insufficient to control excessive soil erosion. (1) <br /> (1) Table 1. <br /> [HBHfjb 5/87 Retyped 5/96] <br /> 4-108 <br /> Revision: - <br /> Approved: <br />