The California Bay Delta Authority (formally CALFED) identified the need to address the source of water quality degradation in Rock Slough and the Contra Costs Canal and included this project as an integral part its program. Possible sources of water quality degradation include agricultural
drainage, wet weather runoff, and groundwater seepage. As part of this program, Contra Costa Water District has implemented an innovative adaptive monitoring program that builds on existing monitoring to assess the sources of degradation to Rock Slough and Contra Costa Canal. The monitoring
program includes a field survey, grab sampling, and continuous measurements of electrical conductivity and flow. These monitoring elements build upon each other to focus in on the sources of degradation. Monitoring results revealed two distinct sources of water quality degradation and provided
valuable data for modeling to evaluate the potential alternatives to improve water quality in Rock Slough. Agricultural drainage and groundwater seepage were identified as the primary source contributing to water quality degradation in Rock Slough and Canal, respectively.
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