Strategies addressing hydromodification in channels through unstable terrains
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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

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


Stream walks Unstable Terrains Sediment Point Sources

  • Bank Failure

  • Knickpoint

  • Earthflow

Incising tributaries




Solutions
Solutions Unstable Terrains

  • ……………………….

  • ……………………….

  • ……………………….

  • ……………………….

  • ……………………….

  • ……………………….


1 headwater detention slight 2 reduce peaks
1. Headwater Detention (slight) Unstable Terrains2. Reduce Peaks


3 detention hyper
3. Detention (hyper) Unstable Terrains

Measured bankful

Measured Bankful




6 strategic channel stabilization
6. Strategic Channel Stabilization Unstable Terrains

Photo courtesy of LSA Associates


Summary
Summary Unstable Terrains

  • 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.



Thompson creek san jose
Thompson Creek, San Jose Unstable Terrains


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