. Bulletin. Science. SAN DIEGO STORM WATER MONITORING PROGRAM 13. Fig. 3. Chronic toxicity of San Diego urban runoff samples to Ceriodaphnia dubia measured during the 1994-95 wet season. winter when rainfall is greatest (Fig. 4A). In fact, there was a significant correlation of enterococcus density and rainfall quantity (Kinnetic Laboratories 1994a). Fur- thermore, enterococcus densities in east Mission Bay were higher than densities in west Mission Bay during the wet season, but were similar during the dry season. Figure 4B shows that wet days were always higher for fecal coliform than dry da
. Bulletin. Science. SAN DIEGO STORM WATER MONITORING PROGRAM 13. Fig. 3. Chronic toxicity of San Diego urban runoff samples to Ceriodaphnia dubia measured during the 1994-95 wet season. winter when rainfall is greatest (Fig. 4A). In fact, there was a significant correlation of enterococcus density and rainfall quantity (Kinnetic Laboratories 1994a). Fur- thermore, enterococcus densities in east Mission Bay were higher than densities in west Mission Bay during the wet season, but were similar during the dry season. Figure 4B shows that wet days were always higher for fecal coliform than dry days throughout Mission Bay. Fecal coliform densities during wet days were highest at Station 3 and slowly decreased towards Station 10. Station 3 is located at the mouth of Tecolote Creek. Station 8 is located at the mouth of Rose Creek. In contrast, fecal coliform densities were variable during dry days with no consistent spatial trend. Discussion Contaminant concentrations in storm water and pollutant mass emissions dis- charged during storm events were greatest at Chollas and Tecolote Creeks. Relative to four other large urbanized watersheds in the study area, the loading of suspended solids and most metals during median-sized events were highest at these two channels. Although exact sources of contaminants within these watersheds are unclear, both have a low percentage of open lands relative to the other channels, amongst the highest proportions of residential and commercial land uses, and generate large flow rates which can mobilize pollutants. Tecolote and Chollas Creeks are currently the focus for continued wet weather Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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