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Alafia River Minimum Flows and Levels - Southwest Florida Water ...

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Table 2-10. Results of Kendall's tau analysis on residuals (from various water quality parameters regressed against flow) versus<br />

time. Yellow shading indicates a statistically significant decreasing trend; blue shading indicates a statistically significant<br />

increasing trend.<br />

WITHLACOOCHEE RIVER AT HOLDER<br />

Parameter Residual Residual Median n p Value intercept slope<br />

Conductance -2.8100 269 0.67368 -8.56307 0.00020<br />

Dissolved Oxygen -0.0530 170 0.23039 1.51387 -0.00005<br />

pH -0.0124 249 0.39982 0.09717 0.00000<br />

NOx -0.0006 205 0.30559 0.03173 -0.00001<br />

Phosphorus 0.0008 168 0.00289 -0.04168 0.00000<br />

Hardness -1.9200 185 0.23975 8.70238 0.00270<br />

Calcium -0.4120 214 0.62894 0.76156 -0.00004<br />

Chloride 0.0870 228 0.00000 -2.76800 0.00010<br />

Fluoride -0.0287 207 0.43782 -0.03258 0.00000<br />

Iron -2.6000 155 0.00000 -118.59200 0.00431<br />

Magnesium -0.0256 214 0.38274 0.17967 0.00001<br />

Potassium 0.0023 204 0.03940 -0.17603 0.00001<br />

Silica -0.0700 223 0.02427 2.19811 -0.00008<br />

Sodium -0.0356 208 0.00087 -0.93858 0.00003<br />

Sulfate -1.6400 208 0.82802 -0.90412 -0.00003<br />

2-80

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