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  1. 1. The reconfiguration of the Gardiner Expressway and KeatingChannel Precinct strives to create an innovative and econom-ically-sound vision for the revitalization of this vital piece ofToronto’s waterfront and infrastructure. AS+GG recommendsremoving the elevated Gardiner Expressway and replacing itwith:1. A new Gardiner Tunnel, which will serve through-traffictravelling north on the Don Valley Parkway, and;2. A new Lake Shore Boulevard, an innovative and sustainableaddition to Toronto’s downtown roadway network.“Four Flows: The Evolution of Gardiner Expressway” impliesdefinitive change, yet offers the possibility of a relativelyseamless transition and a metamorphosis into something bet-ter. This proposal offers these possibilities and much more tothe people of Toronto.“Four flows” refer to four distinct elements that are integral tothe reinvention of the Gardiner: 1) People, 2) Transportation,3) Natural Systems, and 4) Development. The harmonious“flow” of these elements throughout the site is the basis of thisdesign and the linchpin to the creation of a sustainable, suc-cessful 21st century district for Toronto.Flow1: People. The seamless movement of people to the wa-ter’s edge will create a vibrant waterfront district and enhancethe quality of life for Toronto’s citizens.Flow 2: Transportation. Roads and transit systems must pro-mote access to the new Gardiner Expressway while also pro-viding the necessary capacity for those traveling through Gar-diner as a central thoroughfare in the city.Flow 3: Natural Systems. Environmental assets such as thewaterfront, Don River and new public parks will create a richlandscape environment.Flow 4: Development. An expanded tax base will encouragedevelopment that creates long-term benefits for the citizensof Toronto.“Evolution” describes a proposed metamorphosis of the Gar-diner Expressway. It is neither desirable nor possible to re-move all vestiges of the Gardiner. As with all things, it is timefor the Gardiner to move into the next phase of its existence,thus requiring an evolution into the Gardiner Tunnel.F O U R F L O W SG A R D I N E R - E X P R E S S W A Y25M 50M 100M 200M0M5626671
  2. 2. Design StrategiesSystems Diagrams“Four Flows” acknowledges the importance of the Keating Channel District and the LowerDon Lands engaging with the Don River ecosystem. Flows of natural systems , people,transportation, and development come together, creating a distinctive terminus for theeastern edge of the downtown core. The Don River ecosystem is the defining characteris-tic of this area, with its unique flora and hydrologic systems.An understanding that the Keating Channel District as the eastern edge of the downtowncore, requires land uses that express this unique condition: both residential and com-mercial. The confluence of City and Natural systems at this eastern edge is expressedthrough a new residential and commercial community and Park system.The seasonal fluctuations of the Don River, as it passes the site, is acknowledged throughthe creation of floodplains and plant species that thrive in these areas.0 2QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQUUUUUUUUUEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEENNNNNNNNSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS QQQQQQQQQUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUAAAAAAAAAAAAAAAAAAAAAAAAAAAYYYYYYYYYYYYYYY EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEAAAAAAAAAAAAAAAAAAAAAAASSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSTTTTTTTTTTTTLLLLLAAAAAAAKKKKKKKKKKKKKKEEEEEEEEESSHHHHHHHHHOOOOOOOOOOOOORRREEEEEEEEEEEEEEEEE BBBBBBBBBBBBOOOOOOOOOOOOUUUUUUUUUUUUUULLLLLLLLEEEEEEVVVVVVVVVAAAAAAAAARRRRRRRDDDDDDDDDDDDDDD EEEEAAAAASSSSTTTTPARLIAMENTSTREETTTTTTTTTTTTTTTTTTTRRRRRRRRRRRRRRRRRRRIIIIIIIIIIIIIIIINNNNNNNNNNNNNNNNIIIIIIIIIIIIITTTTTTTTTTTTTTTYYYYYYYYYYYYYYYYYYSSSSSSSSSSSSSSSSTTTTTTTTTTTTTTTRRRRRRRRRRRRRRRRRREEEEEEEEEEEEEEEEEEEEEEEEEEEEEEETTTTTTTTTTTTTTTTCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHEEEEEEEEEEEEEEEEEERRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRYYYYYYYYYYYYYYYYYSSSSSSSSSSSSSSSSSTTTTTTTTTTTTTTTTTTRRRRRRRRRRRRRRRRRREEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEETTTTTTTTTTTTTTTTTMUNITIONSSSSSSTTTTTTTTTRRRRRRRRRRREEEEEEEEEEEEEEEEEEEEEETTTTTTTTTTT1 Develop a Signature Don River Crossing2 Complement Existing Plans3 Increase Redevelopment Potential4 Strengthen View Corridors to Water5 Transform the Ground Plane6 Beautiful and Effective Roadway Infrastructure14253621011 11121110151117101920111816141324252524192
  3. 3. All north-south streets are aligned with current or pro-posed Toronto streets, ensuring complete and clear accessto the waterfront.A hierarchy of streets, including 1) north-south “green fin-ger” streets that lead residents to the water from north-ern neighborhoods; 2) Secondary, internal streets for ser-vice and local access; and 3) Two east-west boulevards(Queen’s Quay and Lake Shore) to connect the Precinctto adjacent development and roadways.The development character of the project will be one ofvariety at the street-level, enhanced with elegant consis-tency in the architecture. We recommend the develop-ment of simple, yet focused design guidelines to controlthe materials, massing and fundamental urban principlesof the plan. A modern and innovative design standard canbe established that is consistent with the classic principlesof great urbanism: holding street edges, a consistent ma-terials palette, front doors on primary street, and servicethrough alleys behind buildings. Toronto must be the ben-eficiary of a stable implementation of development of thehighest character.CityscapeNorth-South Connections2122232543856727PRIMARY PLAN ELEMENTS1 Tunnel Below Boulevard2 Lake Shore Boulevard3 Point of Emergence (Tunnel)4 Green Bridge DVP Fly Over5 Bioswale6 Bicycle Path (Boulevard bikeway “The Bern”)7 Future Shoreline River Park8 Sedimentation and Debris Management9 Victory Soya Mills Silo10 Waterfront Park11 Green “Fingers”12 School Park13 Parliament Street Underpass14 Cherry Street Underpass15 Queen’s Quay Boulevard16 Keating Channel17 New Residential and Commercial District18 Parliament Slip19 Queen’s Landing Park20 Residential Tower21 New Lake Shore Boulevard Bridge22 Lake Shore Boulevard East23 Don River Greenway24 Primary Green Streets25 Secondary Green Streets26 Elevated Gardiner Expressway27 Don River Mouth Park3
  4. 4. T h e d e v e l o p m e n t c h a r a c t e r o f t h e K e a t i n gC h a n n e l P r e c i n c t , a s w i t h a l l s u c c e s s f u l u r b a nd i s t r i c t s , i s p r e d i c a t e d o n w a l k a b i l i t y, a p p r o p r i -a t e l y s c a l e d i n f r a s t r u c t u r e , a n d r i c h m i x o f l a n du s e s .The absence of the massive structure on the top of thechannel wall will create new opportunities for use and ex-perience of the Keating Channel waterfront and extendToronto’s waterfront potential the complete length of theKeating Channel east to the Don River.This dramatic change allows the addition of regenerativegreen features to the previous design for theKeating Channel Waterfront: Open rows of trees will mir-ror the waterfront planned at East Bay Front Precinct. Wa-terfront park space will visually connect to the Don RiverFlood Plain green open space by the introduction of infil-tration strips of wetland, woodland and permeable pave-ment.Don River Mouth ParkStreetscape4
  5. 5. The new Don River Bridge will be a modern landmark forthe city, gracefully arcing from the Gardiner Tunnel tothe Don Valley Parkway. The bridge is formed by a wing-shaped cross-section, providing structural rigidity whilesheltering cars from prevailing northwest winds.Open to the south and east, the bridge will offer views toLake Ontario and to the city skyline. Plants may cover thewire-mesh screen above the roadway. The new landmarkwill provide adequate clearance over the CN rail lines andmeet the north-bound DVP before the Richmond Streetoverpass.A new “smart” Lake Shore Boulevard is the technologicaland transportation foundation of our proposal. A 45-me-ter (ROW) boulevard that not only is beautiful and func-tional but also provides many sustainable attributes, withthe resulting combination raising this boulevard to trulynew levels of intelligence.The TunnelThe tunnel will be built to the greatest extent possible us-ing recycled materials (concrete, asphalt etc.). As muchas possible of the tunnel will be pre-cast to allow for theuse of supplementary cementitious materials (such as blastfurnace slag or fly ash cement) to reduce the embodiedcarbon of the built structure. Minimizing the amount ofexcavation spoil is a priority, as the haulage, and treat-ment, in case of contamination, is both expensive and hasan environmental impact. Opportunities to reduce thisimpact include re-use of spoil to build up the embank-ment, minimizing the cross-sectional area of the tunneland minimizing the depth below grade . The tunnel will beilluminated through a combination of light tubes (punchedthrough the boulevard above) as well as LED lighting, sen-sors within the tunnel will ensure that the lighting inten-sity responds to traffic flows and natural lighting intensity,much in the way that smart lighting sensors work in offices.Ventilation will be driven by the air movement of traffic,carbon monoxide sensors will control mechanical ventila-tion systems so that energy consumption is minimized.1. Excess heat from build ing can be used to warm roadsurfaces and assist snow melt2. Embedded heating elements3. Concrete walls function as thermal conductive heat ex-change4. Light tube5. Modular HDPE rain water infiltration Chambers will pro-vide a sustainable drainage solution for water run offfrom the Boulevard and bicycle paths6. Utility Access Chamber7. Bicycle Path (Boulevard bikeway “The Bern”)8. Future Tram/ Street CarSmart BoulevardGreen Bridge0 5Sustainable attributes include:12234568 75