Washington

Seattle, Washington: Redevelopment Project

Posted on November 7, 2018 by jehollow

City: Seattle
Country / US State / US Territory: Washington
Type of Solution: Vacant Properties and Lots
Climate Impact: Extreme Precipitation and Flooding
Social Value Created: recreation; public gathering space; social cohesion; connectivity; employment; benefits vulnerable communities

The City of Seattle recently redeveloped undertook a nine-acre redevelopment project to repurpose an underutilized parking lot and the surrounding area. The Thornton Creek restoration is one component of the restoration project. Thornton Creek was previously been forced below the surface as the urban area developed.

The restoration project aimed to restore the creek to manage stormwater runoff from 680 acres. Impervious surfaces were also reduced by 78%, improving ground water infiltration and thereby reducing runoff. Native species were used for 85% of the project’s landscaping, reducing water consumption for landscaping and reducing maintenance needs. The project design also improves stormwater filtration to remove pollutants from stormwater runoff, removing 40-80% of total suspended solids from 91% of runoff in the 680 acre drainage basin.

Thornton Place is a combined residential and commercial space created in the redevelopment. The project added 530 units of mixed-income housing and 50,000 square feet of retail space, including 143 units of assisted-living housing for seniors. Thornton Place also includes a 14-screen cinema and a plaza area for public gatherings. Additionally, pedestrian links were created to link adjacent commercial and residential neighborhoods, improving walkability. Transit access was also improve by the design, increasing mobility and diversity of transportation.

Sources:
Benfield, K. (June 6, 2011). How to turn a parking lot into an ideal green community. The Atlantic. Retrieved from https://www.theatlantic.com/national/archive/2011/06/how-to-turn-a-parking-lot-into-an-ideal-green-community/239973/.

Benfield, K. (June 7, 2011). A seattle redevelopment that is greener than green. Grist Magazine. Retrieved from https://grist.org/urbanism/2011-06-06-seattle-urbanism-transit-state-of-the-art-green-mixed-planning/.

Seattle, Washington: Elevated Floating Bridge

Posted on November 7, 2018 by jehollow

City: Seattle
Country / US State / US Territory: Washington
Type of Solution: Bridge
Climate Impact: Hurricanes and Extreme Storms
Social Value Created: Diverse Transportation; Public Health and Safety; Active Living and Recreation

The Washington State Department of Transportation (WSDOT) is completed reconstruction of the Evergreen Point (SR 250) floating bridge spanning Lake Washington in April 2016. The bridge is the longest floating bridge in the world. Floating bridges are support by large, water-right concrete pontoons. The bridge was reconstructed to withstand that anticipated increase in wind loads from more frequent extreme storms and hurricanes. Stronger winds may result in bridge failure by breaking the drawspan, anchor cables, or pontoons.

The new bridge design has also addressed anticipated increases in traffic congestion by increasing the width of the lands and adding a transit/High Occupancy Vehicle (HOV) lane. Additionally, there will be a new 14-foot-wide bicycle and pedestrian path that connects to recreational trails, improving recreation and increasing diversity of transportation options for commuters. The new design include flexibility for the City to add on a light rail in the future, also supporting diverse transportation options.

Sources:
Washington State Department of Transportation. (n.d.). SR 520 bridge replacement and HOV program – floating bridge facts. Retrieved from https://www.wsdot.wa.gov/Projects/SR520Bridge/About/BridgeFacts.htm.

Seattle, Washington: Elliott Bay Seawall Project

Posted on November 7, 2018 by jehollow

City: Seattle
Country / US State / US Territory: Washington
Type of Solution: Seawall and Living Shorelines
Climate Impact: Seal Level Rise
Social Value Created: Diverse Transportation; Public Health and Safety; Active Living and Recreation

The City of Seattle recently finished replacing an aging seawall located in Elliot Bay in 2017 that was built between 1916 and 1934. Due to risk of failure during an earthquake, a new sea wall is being constructed with a 75 year lifespan. Under advisement from the University of Washington’s Climate Impacts Group (CIG), the Seattle Department of Transportation (SDOT) is constructing a seawall using the low-probability, high-impact estimate for sea level rise, i.e. the worst projected scenario for 2100. The seawall not only protects against sea level rise, inundation, and coastal erosion, but it also supports a diverse transportation network.

The sea wall supports a highway, a ferry terminal, rail lines, biking, and walking. A pedestrian promenade and a two-way cycle track are being constructed to improve walkability and bikeability. Additionally, the seawall is designed to improve and recreate a natural aquatic shoreline habitat, such as glass blocks in the sidewalk to allow light penetration to the water below and salmon migration pathways. The project also includes reconstruction of two public piers and construction of new parks and recreational pathways.

Sources: pegNielsen. (April 23, 2014). More than just a seawall habitat: Enhancing habitat in the Elliott Bay and preserving public safety (Blog post). Retrieved from http://sdotblog.seattle.gov/2014/04/23/more-than-just-a-seawall-enhancing-habitat-in-elliott-bay-and-preserving-public-safety/.

Seattle Office of the Waterfront and Civic Projects. (n.d.). Seawall. Retrieved from https://waterfrontseattle.org/seawall.

The Adaptation Clearinghouse. (March 18, 2016). Seattle, Washington Department of Transportation (Seattle DOT) Elliott Bay Seawall Project. Retrieved from http://www.adaptationclearinghouse.org/resources/seattle-washington-department-of-transportation-seattle-dot-elliott-bay-seawall-project.html.