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Researchers: engineered channels often limit biological recovery, but some interventions may help
Summary
Statewide analyses show hard‑bottom channels rarely reach reference bioassessment scores; soft‑bottom engineered channels can perform better and, in many cases, modest flow or water‑quality interventions could yield incremental improvements.
Rafael Mazur (Southern California Coastal Water Research Project) summarized statewide analyses of bioassessment scores in modified channel types and explored where interventions are likely to improve biological condition.
Mazur presented relationships between index scores (CSCI) and stressors such as specific conductivity, showing steep negative relationships in natural channels and milder or flat relationships in…
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