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Floating Wetlands for the Duwamish River Nancy Rottle, Associate Professor Director, Green Futures Research and Design Lab University of Washington

Mason Bowles, Senior Ecologist King County Department of Natural Resources and Parks Green Duwamish Watershed Symposium, February 29, 2016


What is a floating wetland?

A floating organic mat supporting wetland plants.


Natural Floating Wetlands

Floating marshy peat mat, New Hampshire


Natural Floating Wetlands

Esteros del ibera, Argentina


Natural Floating Wetlands

Evans Creek Natural Area, Redmond


What is a floating wetland?

A constructed wetland that mimics natural floating wetlands.


Tether

Native wetland plants

Floating island matrix providing buoyancy and growing medium

Anchor


Floating wetlands

emergent

submergent

scrub-shrub


Emergent floating wetland

Redmond WA


Submergent floating wetland

Redmond, WA


Scrub Shrub

Redmond, WA


What do floating wetlands do?

Mimic natural wetlands to improve ecosystems.


Plants provide insect and bird habitat

Microbes remove phosphorous, nitrogen, ammonia, copper, zinc from water

Plant litter and insects feed fish

Roots capture suspended sediments and dissolved nutrients


Provide terrestrial habitat

Beautify shorelines

Provide fish habitat

Improve water quality


Greenway corridors

Baltimore Harbor


Greenway corridors

National aquarium, Baltimore


Stormwater treatment

New Zealand


Stormwater treatment

White Center, WA


Reduce water temperatures

Brightwater treatment plant, Woodinville


Shoreline habitat creation

Year 1

Year 3

River Brent, Scotland


Terrestrial habitat


Aquatic habitat


Salmon habitat


Beautify urban shorelines

Shanghai Houtan Park, China


What would floating wetlands do in the Duwamish?

Restore a wetland edge along the banks of the Duwamish

Create connections between habitats Improve water quality Increase salmon habitat Green the Duwamish


2,750 acres wetland

8.25 acres wetland


Floating wetland study proposal


US Army Corps of Engineers


Army Corps of Engineers


Army Corps of Engineers


SHOW BULKHEAD W/OUT FW


SHOW BULKHEAD W/OUT FW


Terminal 105


South Park Bridge


Army Corps of Engineers


Army Corps of Engineers


T-105


Urban Shorelines

Past

Present

Future


Questions?


Nancy Rottle, Associate Professor Director, Green Futures Research and Design Lab University of Washington nrottle@u.washington.edu

Mason Bowles, Senior Ecologist King County Department of Natural Resources and Parks Mason.bowles@kingcounty.gov

Duwamish Floating Wetlands  

A presentation showing the potential application of floating wetlands in Seattle's Duwamish River.

Duwamish Floating Wetlands  

A presentation showing the potential application of floating wetlands in Seattle's Duwamish River.

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