Floodplain Restoration

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Floodplains are critical aquatic habitats for Salmon, extensively modified by Beaver. Floodplains have been severely modified for Transportation Networks and Agriculture and Flood Hazard Management resulting in loss of Biodiversity changes to Hydrology and Hydrodynamics reduction of the Channel Migration Zone loss of Riparian Buffers and reduction of Water Quality. Floodplain Restoration involves a variety of management measures, specifically Revegetation, River Levee and Armor Removal, removal of Infrastructure and construction of Engineered Log Jams, with or without Fluvial Channel Reconstruction. In addition Dam Removal and modification of regulated hydrology can have dramatic effects on floodplain processes. All these processes and practices occur under Climate Change which is anticipated to alter hydrology. This work is supported by different kinds of Puget Sound Ecosystem Funding.

Proposal for Organizing Information About Floodplain Restoration

The goals of the platform is to organize information into packets using pages and categories strengthen information sharing and best available science. We have not yet developed a coherent set of categories under Category:Restoration to organize those page-based information packets. A common past practice (for example PSNERP management measures, or PRISM database records) is to classify restoration based on the discrete actions described in a scope of work. However in many cases, the same action can be implemented for different purposes for example, channel reconstruction or levee removal or road removal or wood placement can be completed to achieve different effects in the floodplain environment. Subsequent work (given the PSNERP example Cereghino et al 2012 puget sound nearshore strategy) organize restoration strategy around process restoration objectives, for example, "restore sediment supply". By organizing restoration around the restoration of ecological processes, it clarifies the strategies and hypotheses that drive restoration acts be addressed through restoration and learning, and links restoration efforts more directly to the ecological phenomena that define ecosystem services.

In floodplains, this suggests the following:

1. Restore Channel Planiform Evolution
2. Restore Floodplain Hydraulic Connection
3. Restore Floodplain Habitat Complexity
4. Restore Forest Ecology
5. Restore Groundwater Recharge

Topics and Efforts in Floodplain and Restoration

  Topics

Engineered Log Jams  •  Flood fencing  •  No Rise and The Letter of Map Revision  •  Riparian Buffers

  Efforts

Barnaby Reach Restoration  •  Farmhouse Reach Floodplain Restoration  •  Haskell Slough Protection and Restoration  •  Jim Creek Channel Enhancement  •  Larson's Reach Floodplain Restoration  •  Lower Canyon Creek Restoration  •  Lower Skykomish Floodplain Design  •  Lower Skykomish Reach Scale Plan  •  Lower Snohomish Reach Scale Plan  •  Nooksack Floodplain Restoration with Engineered Log Jams  •  Scatter Creek Farm and Conservancy  •  Skykomish Braided Reach Project  •  Skykomish Habitat Mitigation Bank  •  The Ecosystem Guild/Bio-Cultural Restoration Field Stations  •  Working Buffer Pilot Project

Products in Floodplain and Restoration

The following Product pages are categorized with the categories Floodplain and Restoration.

Documents

• Abbe et al 2018 design and placement of engineered log jams
• Beechie et al 2010 process based restoration of rivers
• Biddle et al 2022 national strategy protect restore floodplain wetland function
• Brown 2015 DRAFT nooksack floodplain vision and implementation
• Collins & Montgomery 2002 restoring wood in river floodplains
• Habitat Strategic Initiative 2021 estuary and floodplain implementation strategy
• Hass 2001 snohomish ecosystem restoration opportunities
• Herrera 2007 canyon creek restoration plan
• Knutson & Naef 1997 riparian management recommendations
• Leonetti et al 2015 north fork stillaguamish habitat change
• Roni et al 2013 DRAFT BPA columbia river restoration monitoring plan
• Roni et al 2015 wood placement summary
• Scott 2023 valley bottom reset monitoring Deer Creek Oregon
• Skidmore & Wheaton 2022 riverscapes as adaptation infrastructure
• SnoCo 2014 DRAFT lower skykomish reach scale plan
• USACE 2000 stillaguamish restoration feasibility.pdf

Websites & Datasets

Graphics

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particles of clay, silt, sand, gravel, or cobble, transported by water, are called sediment.