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Strategies Addressing Hydromodification in Channels Through Unstable Terrains

Strategies Addressing Hydromodification in Channels Through Unstable Terrains. John Gartner Barry Hecht Shawn Chartrand Edward Ballman, P.E. BALANCE HYDROLOGICS, INC. NOTE: First half of presentation is in: “Gartner GSA talk hydromodification 5-1-05 part 1.pdf.

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Strategies Addressing Hydromodification in Channels Through Unstable Terrains

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  1. Strategies Addressing Hydromodification in Channels Through Unstable Terrains John Gartner Barry Hecht Shawn Chartrand Edward Ballman, P.E. BALANCE HYDROLOGICS, INC. NOTE: First half of presentation is in: “Gartner GSA talk hydromodification 5-1-05 part 1.pdf

  2. Stream walks Sediment Point Sources • Bank Failure • Knickpoint • Earthflow Incising tributaries

  3. Custom modeling with HEC-HMS for middle watershed

  4. Modeling middle reach effects

  5. Solutions • ………………………. • ………………………. • ………………………. • ………………………. • ………………………. • ……………………….

  6. 1. Headwater Detention (slight) 2. Reduce Peaks

  7. 3. Detention (hyper) Measured bankful Measured Bankful

  8. 4. Avoid Most Vulnerable Channels

  9. 5. Improved Grazing Management

  10. 6. Strategic Channel Stabilization Photo courtesy of LSA Associates

  11. Summary • Hydromodification is a vital issue in the urbanizing West, especially in areas with geologic or geomorphic disturbance. • Solutions are often best approached from geologic perspective: • Recognizing the one-time nature of channel adjustment • Based on intensive field work in disturbed landscapes. • Value of baseline data – flow, sediment, channels. • Solutions should spring from watershed perspective and work with site conditions.

  12. Interdisciplinary effort and review

  13. Thompson Creek, San Jose

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