Researchers: engineered channels often limit biological recovery, but some interventions may help
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.
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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.
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