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Sediment Targets in the Boise River Tributaries Hawk Stone Idaho DEQ - - PowerPoint PPT Presentation
Sediment Targets in the Boise River Tributaries Hawk Stone Idaho DEQ - - PowerPoint PPT Presentation
Sediment Targets in the Boise River Tributaries Hawk Stone Idaho DEQ Documents: Newcombe and Jensen (1996) Meat analysis: 80 studies How does sediment affect fish? 3 Questions Which grouping of fish Concentration of sediment
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Newcombe and Jensen (1996)
- Meat‐analysis: 80 studies
- How does sediment affect fish?
- 3 Questions
– Which grouping of fish – Concentration of sediment – Duration of sediment
- 1 Answer = Severity of Effect on fish
- Use Matrix
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N&J EXAMPLE 1
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N&J EXAMPLE 2
duration is as important as concentration.
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Boise River TMDL CH2MHill Technical Memorandum
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Boise River Mainstem Target
50 mg/L for 60 days
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N&J Lower Boise River
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Tributary Sediment Targets
- Keep as much as possible from the Lower
Boise River (mainstem) TMDL
– Same framework (use Newcombe and Jensen) – Same fishery (juvenile salmonids) – Same level of protection (SEV8)
- BUT, sediment data show that we need a
different duration
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4 months 5 months
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4 months 5 ½ months storm event
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4 months 5 ½ months
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