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<br />TABLE 12 <br /> <br />Comparisons of Peak Pollutant Concentrations <br />in Stormwater Runoff from an Urban <br />Watershed and a Semi-Urban/Rural Watershed <br />(McElroy and Bell, 1974l <br /> <br />. <br /> <br /> Range of Peak Pollutant Concentrations <br />Parameter Measured <br /> Semi-Urban/Rural Watershed Urban Watershed <br />BOD, mg/2 3 to 7 11 to 44 <br />Suspended Solids, mg/2 6 to 170 62 to 250 <br />Total Coliform Counts 930 to 46,000 930 to 240,000 <br />(organisms/mIl <br />Fecal Coliform Counts 930 to 9,300 430 to 98,000 <br />(organisms/ml) <br /> <br />were much higher for the urban watershed as compared to the <br /> <br />semi-urban/rural watershed for all of the parameters that were <br /> <br />studied. <br /> <br />Turner and Burton (1975) carried out studies on the effects <br /> <br />of land use on hydrology and nutrient and suspended solids exports <br /> <br />from three north Florida watersheds. The three watersheds repre- <br /> <br />sented a wide variation in land use as indicated in Table 13, <br /> <br />which summarizes their characteristics. Sampling and flow <br /> <br />measurements were taken in a stream that drained each individual <br /> <br />area. Each stream had a low flow of less than 0.02 cubic meters <br /> <br />per second (0.7 cfs), and each occasionally became dry. <br /> <br />32 <br />