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Floodplains occur where large rivers and streams meander in their own sediments

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Floodplains form where rivers flow through a valley of alluvial sediment several times the width of the channel. During floods, the river inundates the floodplain depositing sediments. Floodplains and their rivers are fed by both headwaters and lowland watersheds, and flow into river deltas as they enter the sea. Floodplains are generally described by FEMA mapping of flood hazard areas. The Floodplains by Design effort by The Nature Conservancy of Washington is anticipated to provide a stronger assessment of these systems. Lakes, ponds and wetlands are all different kinds of floodplains (where shallow ground water is found at or near the surface for parts of the year).

Physical Context[edit]

USGS collaborates with NOAA to provide real-time data on river flow and flood stage. Mauger et al 2015 describes anticipated change in flow regime. Rivers are flows of both water and sediment and Czuba et al 2011 summarizes existing data on total sediment budget. Collins & Montgomery 2011 describes a diversity of physical systems, based on how much, and how floodplains have filled since glacial excavation.

Biological Context[edit]

Besides us, beaver are key ecosystem architects, and reduction in beaver populations combined with flood hazard management have radically changed floodplain ecosystems.

Planning Context[edit]

Because of our dry-summer climate, moist rich floodplain soils are vital to agriculture. The Puget Sound Partnership has adopted a floodplain restoration target as part of Puget Sound Vital Signs. Floodplains by Design has promoted multi-benefit restoration strategies, with novel efforts in the Puyallup/White. Snohomish, Stillaguamish, Skagit, Nooksack, Dungeness and Skokomish basins. Floodplain habitats. The Puget Sound Watershed Characterization identified a unique set of floodplain attributes because of wetlands, including those created by beaver, re-affirming the importance of floodplains already described in salmon recovery planning, particularly for endangered Puget Sound Chinook Salmon. A constellation of authorities and agencies in Flood Hazard Management systems are focused on floodplain dynamics.

Floodplain Topics[edit]

The following topics are related to floodplains:

Floodplain Sites and Places[edit]

The following sites are in floodplains:

Floodplain Efforts[edit]

The following efforts are being implemented by workgroups in floodplains:

Floodplain Documents[edit]

The following pages cite documents about floodplains:

The following floodplain documents are uploaded to this wiki: