Atlanta urban design and stormwater
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2014 Park Pride Parks and Greenspace Conference Presenters are Johanna McCrehan & Richard Dagenhart,
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Atlanta urban design and stormwater
- 1. Johanna McCrehan, Urban Designer, Georgia Conservancy Richard Dagenhart, RA, Associate Professor of Urban Design, Georgia Institute of Technology March 31, 2014 Park Pride Parks and Greenspace Conference Urban Design and Stormwater and Urban Design Georgia Conservancy + Georgia Tech Urban Design Studio
- 2. Urban Design and Stormwater 1. Why Stormwater? 2. Understanding Stormwater Management 3. Conservancy Blueprints + Urban Design Studios Colonial Homes, Bobby Jones Golf Course and the Peachtree Creek Watershed Maddox Park, Boone Boulevard and the Proctor Creek Watershed Pittsburgh, University Avenue and the McDaniel Creek Watershed Ansley Mall and the Clear Creek Greenway and Watershed 4. Conclusions: Urban Design and Stormwater
- 3. STORMWATER IS AN URBAN DESIGN PROBLEM AND URBAN DESIGN IS A STORMWATER PROBLEM
- 4. Georgia Conservancy GC - Blueprints for Successful Communities Sponsored by The Home Depot Foundation The Sartain Lanier Foundation, Inc. Georgia Tech Urban Design Studio School of Architecture, School of City and Regional Planning Richard Dagenhart, RA, Associate Professor Dr. Tom Debo, PE, Professor Emeritus
- 5. Why Stormwater? Research-based Blueprints for Successful Communities Education through partnerships Statewide initiatives and technical assistance
- 6. Regional Atlanta Watersheds: Upper Chattahoochee Upper Middle Chattahoochee Upper Flint Upper Ocmulgee Etowah Coosawattee Upper Oconee ARC area www.atlantaregional.com GEORGIA’S 52 WATERSHEDS
- 7. Understanding Stormwater Management Stormwater problems have been defined as the control of peak rates of runoff from new urban development The engineering solution: control post- development runoff from specific rainfall events (5-, 10-, 100-year storms) so they do not exceed pre-development runoff The design solution: construct a storm detention basin at the development site’s drainage outlet
- 8. Criticism of Stormwater Management Practices Evidence shows that end-of-pipe stormwater solutions do not address the hydrologic changes induced by new development, nor do they consider stormwater quality The problem in previous approaches was to focus on individual development sites rather than the processes of water flows … as they move from the individual development sites into the larger ecological system of urban waterways or into the equally
- 9. Low Impact Development (LID) – The New Approach Stormwater management focuses on both water quantity and water quality Stormwater management incorporates natural processes with mechanical processes to design hydrologic solutions Attention is directed as close to the source of stormwater as possible, not the exit from the site
- 10. Stormwater and Urban Design The LID goal is to allow urban development to occur in most situations, but require that the project be designed to limit hydrologic impacts The LID objective is to have urban development approximate the hydrologic characteristics of rural or undeveloped land When LID is broadened beyond a single parcel of land, the design challenge expands from site design
- 11. Urban Design Studio: Research + Design Questions HOW CAN URBAN DESIGN ADDRESS STORMWATER SOLUTIONS? HOW CAN STORMWATER ADDRESS URBAN DESIGN SOLUTIONS?
- 12. Stormwater in Context Four sites along the BeltLine, where the BeltLine Subarea Plans did not specifically address stormwater issues Pittsburgh, University Avenue and the McDaniel Creek Watershed Maddox Park, Boone Boulevard and the Proctor Creek Watershed Ansley Mall and the Clear Creek Greenway and Watershed Colonial Homes, Bobby Jones Golf Course and the Peachtree Creek Watershed Urban Design, not engineering, is the focus of the projects – the concern is the relationship of stormwater solutions, environmental quality, and the future of public and private developments for housing, commercial and other uses.
- 13. 4 SITES
- 14. PITTSBURGH, UNIVERSITY AVENUE AND THE MCDANIEL CREEK WATERSHED
- 17. HYDROLOGY
- 19. PITTSBURGH NEIGHBORHOOD – STORMWATER PLAN
- 20. GREEN STREETS
- 22. PART TWO: UNIVERSITY AVENUE
- 23. UNIVERSITY AVENUE SITE – SUBDIVISION (LOTS, BLOCKS, STREETS) Pittsburgh block width – 200 ft. – same as New York City – accepts any density
- 25. UNIVERSITY AVENUE MASTER PLAN
- 26. BIRD’S EYE VIEW OF CENTRAL PARK
- 27. CENTRAL PARK – LOOKING SOUTH TOWARD THE BELTLINE
- 28. PART THREE: MCDANIEL BRANCH
- 30. MASTER PLAN
- 31. MADDOX PARK, BOONE BLVD AND THE PROCTOR CREEK WATERSHED
- 33. HYDROLOGY
- 36. URBAN ANALYSIS
- 37. EXISTING PROPOSAL URBAN DESIGN STUDIO PROPOSAL
- 39. ANSLEY MALL CLEAR CREEK GREENWAY AND WATERSHED
- 44. SUBDIVISION PLANS AND PHASING
- 45. PERSPECTIVES OF NEW WATER SYSTEM
- 46. CLEAR CREEK GREENWAY MASTER PLAN
- 47. COLONIAL HOMES, BOBBY JONES GOLF COURSE AND THE PEACHTREE CREEK WATERSHED
- 52. URBAN DESIGN AND STORMWATER TACTICS
- 55. ECO-GOLF COURSE 100 YEAR STORM EVENT
- 58. CONCLUSION 1 EVERY project – public or private, no matter how large or how small, must begin with an understanding of its associated drainage basins. For urban design – watersheds always come first!!!! GEORGIA’S 52 WATERSHEDS
- 59. CONCLUSION 2 The location of a project in its watershed shapes both urban design and stormwater decisions. For urban design, site based solutions are the wrong approach. Stormwater policies and regulations must recognize this fact. UNIVERSITY AVENUE, PITTSBURGH AND McDANIEL BRANCH GREENWAY
- 60. CONCLUSION 3 High performance site design, for urban design and stormwater, can combine greenways as incentives for revitalization and new development. MADDOX PARK, BOONE BOULEVARD AND THE PROCTOR CREEK WATERSHED
- 61. CONCLUSION 4 Urban design can MANAGE stormwater when flooding cannot be eliminated. Combine retention and detention in greenways, swap land out of flood plains, create new development opportunities. COLONIAL HOMES, BOBBY JONES GOLF COURSE AND PEACHTREE CREEK
- 62. STORMWATER IS AN URBAN DESIGN PROBLEM AND URBAN DESIGN IS A STORMWATER PROBLEM
- 63. QUESTIONS?
Notes de l'éditeur
- I’d mention this as a Blueprints for Successful Communities project that is more issue/research-based than a public involvement process focusing on one community (the more traditional model). Our hopes for the end product are to not only put this information on our website and give more presentations but work through organizations such as GPA, AIA, GMA, ACCG, and professional engineering groups to advertise this approach as more cost-effective, productive and site and environmentally appropriate, etc. The theme of this blueprints process is to develop urban design recommendations for four sites within the City of Atlanta. These recommendations will specifically address complex stormwater issues, taking into account the nearby stream or creek at each site. Urbanization has caused the loss of wetlands, vegetative cover, forests, an increase in impervious surfaces and changes in the soil that constitute a watershed’s carrying capacity to slow, spread, and stock stormwater. Low impact development solutions promote the use of pervious surfaces to remediate non-point source pollution and peak flow or runoff after a storm. Each project must be one that involves new development or redevelopment so that the students must prepare a framework for development, and then integrate stormwater within that. This helps ensure that the project is not just a retrofit of stormwater applications, but helps provide realistic solutions for other applicable sites.
- I’d mention this as a Blueprints for Successful Communities project that is more issue/research-based than a public involvement process focusing on one community (the more traditional model). Our hopes for the end product are to not only put this information on our website and give more presentations but work through organizations such as GPA, AIA, GMA, ACCG, and professional engineering groups to advertise this approach as more cost-effective, productive and site and environmentally appropriate, etc. The theme of this blueprints process is to develop urban design recommendations for four sites within the City of Atlanta. These recommendations will specifically address complex stormwater issues, taking into account the nearby stream or creek at each site. Urbanization has caused the loss of wetlands, vegetative cover, forests, an increase in impervious surfaces and changes in the soil that constitute a watershed’s carrying capacity to slow, spread, and stock stormwater. Low impact development solutions promote the use of pervious surfaces to remediate non-point source pollution and peak flow or runoff after a storm. Each project must be one that involves new development or redevelopment so that the students must prepare a framework for development, and then integrate stormwater within that. This helps ensure that the project is not just a retrofit of stormwater applications, but helps provide realistic solutions for other applicable sites.
- Atlanta’s watersheds (7) and the Atlanta metro area defined in black. John Wesley Powell, scientist geographer, put it best when he said that a watershed is: “that area of land, a bounded hydrologic system, within which all living things are inextricably linked by their common water course and where, as humans settled, simple logic demanded that they become part of a community”