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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 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 Sediment Point Sources • Bank Failure • Knickpoint • Earthflow Incising tributaries
Solutions • ………………………. • ………………………. • ………………………. • ………………………. • ………………………. • ……………………….
3. Detention (hyper) Measured bankful Measured Bankful
6. Strategic Channel Stabilization Photo courtesy of LSA Associates
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.