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Stream Restoration and Erosive Forces in Streams

Stream Restoration and Erosive Forces in Streams. Summary of Jan 2007 Consensus Presentation October 28, 2008. Key Points. Natural Erosion Improves Habitat Human Induced Erosion Degrades Habitat Causes: Human Activities and Structures Solutions: Reconfiguration + Flow Controls

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Stream Restoration and Erosive Forces in Streams

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  1. Stream Restoration and Erosive Forces in Streams Summary of Jan 2007 Consensus Presentation October 28, 2008

  2. Key Points • Natural Erosion Improves Habitat • Human Induced Erosion Degrades Habitat • Causes: Human Activities and Structures • Solutions: Reconfiguration + Flow Controls • Solutions: Case-by-Case

  3. Erosion is a significant problem

  4. Costs of Erosion • $3 million per year – Sediment Removal • $2 million per year – Bank Repairs Source: Clean Safe Creeks Reports

  5. Stream Zones Headwaters/Source Zone Transport Zone Depositional Zone (Miller 1990) (NRCS)

  6. Corridor Cross-Section Floodplain Bankfull Active Channel Low Flow Channel

  7. Upsetting the Delicate Balance:Impervious Surface Impacts 40% evapotranspiration 38% evapotranspiration 10% runoff 20% runoff 30% runoff 55% runoff (NRCS)

  8. Stream Hydrology Storm Hydrograph Pre – Post Urbanization (NRCS)

  9. Thompson Creek Feb. 2006 Near Aborn (Mar. 2006)

  10. River Science Solutions : • Reconfigure Channels • Moderate Stormwater Discharges from New Development • Moderate Stormwater Discharges from Existing Development

  11. Conclusion • No single solution • Reach by reach analysis • Prioritization

  12. END of Presentation

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