Communities across Puget Sound are beginning to envision and implement a new way of managing floodplains.  Historically, actions to reduce flood risk were separate from actions taken to restore habitat.  Many of these had no considerations for agricultural lands or uses.

Integrated floodplain management is a new form of planning, action and management where Floodplains for the Future (FFTF) partners have agreed on a set of shared visions, strategies, and actions to improve floodplain health. Instead of competing against one another for limited resources, FFTF partners work together to pursue diverse funding opportunities and develop a suite of integrated projects that collectively moves stakeholders across the watershed closer to achieving their goals.

Farms, Fish, Flood Risk

Floodplains are a limited geographic area where our values can sometimes collide. Floodplains provide rich and fertile soil for agriculture, habitat for salmon, and include important sites for flood risk reduction projects that can make our communities safer.

Many of our region’s most productive farms are located in floodplain areas.  Hundreds of years of sediment deposition across floodplains has built up fertile soil that helps farmers grow food to feed our communities.  Agriculture is often considered a compatible floodplain use because, compared to commercial or residential development, farms have less structures at risk from flooding.  But the conditions that allow farming to thrive in a floodplain area can be fragile. A healthy floodplain for farming is one in which flood impacts are not catastrophic, where fields are able to drain, and where groundwater conditions are conducive to farming.

A healthy floodplain for fish is unconstrained by levees, roads, or other barriers that limit the movement of water and nutrients. Unconstrained floodplains allow the development of side channel off-channel habitats that are important to juvenile salmon as they grow.  Floodplain restoration such as levee setback projects reconnect large areas of floodplain to the main river, provide habitat diversity, and are essential to the recovery of ESA-listed salmon such as Puget Sound Chinook salmon. 

Flooding in the Puyallup Watershed is a function of storms and large rain events and is therefore inevitable.  What we can control is the damage floods cause when they happen.  From a flood risk reduction standpoint, a healthy floodplain is one that can withstand a flood event without major damage.  Efforts that move or keep people, homes, businesses, and infrastructure out of dangerous floodplain areas increase our ability to weather flood events.  A healthy floodplain is also one where the failure of a single component of flood management infrastructure will not lead to catastrophic results.  And a healthy floodplain is one that can recover quickly from the disturbance of a flood.

As FFTF Partners work to improve conditions for farms, fish, and flood risk, there are a number of challenges facing all three interests in our floodplains.

Floods

Floods threaten lives and property, inundate and damage farms, can disrupt habitat, and strain flood control infrastructure.

Development

Development in the floodplain reduces the land base available for agriculture, limits opportunities to restore habitat for fish and wildlife, and puts people, homes, and infrastructure at risk during flood events.

 

Climate Change

Increased temperatures, lower stream flows in the summer, increased sediment, and more severe flooding are anticipated impacts of climate change that will pose a threat to agriculture, salmon, and people throughout the Puyallup Watershed.

Response

Flood response and repair costs are increasing in the face of limited funding from state and federal government sources.

Floodplains by Design

Floodplains by Design (FbD) is an ambitious public-private partnership, led by The Nature Conservancy, Department of Ecology and Puget Sound Partnership, focused on integrating and accelerating efforts to reduce flood risks and restore habitat across Puget Sound’s major river corridors.

The goal of FbD is to improve the resiliency of these floodplains for the protection and enhancement of human communities and the health of the ecosystem, while supporting values important in the region such as agriculture, clean water, a vibrant economy and outdoor recreation.

The FbD grant program has funded the FFTF work. More information about Floodplains by Design can be found at http://www.floodplainsbydesign.org/.