Animal Waste, Water Quality and Human Health

Transport of microbial pollution in catchment systems 183Table 5.9 Summary of geometric mean faecal indicator organism (FIO) export coefficients (log 10 cfu km −2 hr −1 ) under base- andhigh-flow conditions at the 205 sampling points and for various subsets, and results of paired, 1-tailed t-tests to establish whetherthere are significant elevations at high flow compared with base flow.FIO Base flow High flowSubcatchment land use n GeometricmeanLower95% CIUpper95% CIGeometric Lowermean a 95% CIUpper95% CITOTAL COLIFORMSAll subcatchments 205 1.8 × 10 9 1.4 × 10 9 2.4 × 10 9 9.5 × 10 10 ** 7.2 × 10 10 1.2 × 10 11Degree of urbanisation bUrban 20 8.5 × 10 9 3.3 × 10 9 2.2 × 10 10 4.1 × 10 11 ** 1.6 × 10 11 1.1 × 10 12Semi-urban 60 4.2 × 10 9 2.6 × 10 9 6.7 × 10 9 1.5 × 10 11 ** 8.3 × 10 10 2.7 × 10 11Rural 125 9.3 × 10 8 6.9 × 10 8 1.3 × 10 9 6.1 × 10 10 ** 4.6 × 10 10 8.0 × 10 10Rural subcatchments with different dominant land uses≥ 75% Improved15 2.9 × 10 9 1.4 × 10 9 6.0 × 10 9 2.8 × 10 11 ** 1.6 × 10 11 4.9 × 10 11pasture≥ 75% Rough grazing 13 7.1 × 10 8 3.5 × 10 8 1.4 × 10 9 5.3 × 10 10 ** 2.6 × 10 10 1.1 × 10 11≥ 75% Woodland 6 3.1 × 10 8 5.7 × 10 7 1.6 × 10 9 1.4 × 10 10 ** 6.0 × 10 9 3.4 × 10 10FAECAL COLIFORMSAll subcatchments 205 5.5 × 10 8 4.1 × 10 8 7.2 × 10 8 3.6 × 10 10 ** 2.7 × 10 10 4.8 × 10 10Degree of urbanisation bUrban 20 2.8 × 10 9 1.1 × 10 9 7.2 × 10 9 1.3 × 10 11 ** 4.8 × 10 10 3.6 × 10 11Semi-urban 60 1.2 × 10 9 7.4 × 10 8 1.9 × 10 9 4.6 × 10 10 ** 2.5 × 10 10 8.6 × 10 10Rural 125 2.9 × 10 8 2.1 × 10 8 4.0 × 10 8 2.6 × 10 10 ** 1.9 × 10 10 3.5 × 10 10Rural subcatchments with different dominant land uses≥ 75% Improvedpasture15 8.3 × 10 8 4.3 × 10 8 1.6 × 10 9 1.2 × 10 11 ** 6.5 × 10 10 2.2 × 10 11(Continued)