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Floodplain Mosaics: Balancing Flows, Landforms, and Biodiversity

Explore the intricate mosaic of floodplains' flows, land forms, vegetation, and wildlife adaptations. Discover how to design floodways to harmonize these aspects and create resilient ecosystems that benefit all.

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Floodplain Mosaics: Balancing Flows, Landforms, and Biodiversity

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  1. Floodplains are Mosaics of Flows, Land Forms, Vegetation, and Critters

  2. Flow: about 65,000 cfs 4 January 2006 Floodplain/ Roughness Mosaic

  3. Channel Meander

  4. Cottonwood Willow Valley Oak

  5. Photo by: David Bogener Photo By: David Bogener

  6. “The Impenetrable Riparian Jungle”

  7. Plant Mosaic on Floodplain Lower Stanislaus River

  8. Lower Stanislaus River

  9. Flood Adaptations Large Flume at J. Amorocho Hydraulics Lab – UC Davis

  10. 10-year old Restoration Planting

  11. Hydraulic Characteristics of Floodplain Adapted Plants

  12. Swim Response to Sandbar Willow ○ = TBF Swim Chamber ● = MO2 ■ =TBF Flume (3.0 ft/s) (1.5 ft/s) (0.5 ft/s)

  13. Vegetation Canopies in Floodplain Design

  14. Vegetation Planting Patterns NVCS Classification CFG – CA grasses RWS – Riparian wash/scrub RWF – Woodland, no understory RWF – Woodland, dense understory Rip-rap “Goose Down” River

  15. 5-Yr Event – 139,600 cfs - Velocities “Goose Down” River

  16. 200-Yr Event – 393,300 cfs - Velocities “Goose Down” River

  17. 200-Yr Event Velocities “Goose Down” River

  18. 200-Yr Event Surface Elevation 20.35 20.38 20.43 20.44 20.44 20.48 “Goose Down” River

  19. Conclusion • Floodplains are mosaics of flows, landscape, plants and animals • Designing floodways should account for and blend all the mosaics • Good designs accommodate our needs, bad designs exacerbate problems • Flood models can help achieve a well crafted system, where plants reduce risk for people and critters and provide ecosystem benefits

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