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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

slide2

Stream walks Sediment Point Sources

  • Bank Failure
  • Knickpoint
  • Earthflow

Incising tributaries

solutions
Solutions
  • ……………………….
  • ……………………….
  • ……………………….
  • ……………………….
  • ……………………….
  • ……………………….
3 detention hyper
3. Detention (hyper)

Measured bankful

Measured Bankful

6 strategic channel stabilization
6. Strategic Channel Stabilization

Photo courtesy of LSA Associates

summary
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.