Johanna McCrehan, Urban Designer,
Georgia Conservancy
Richard Dagenhart, RA, Associate Professor of Urban Design,
Georgia ...
Urban Design and Stormwater
1. Why Stormwater?
2. Understanding Stormwater Management
3. Conservancy Blueprints + Urban De...
STORMWATER IS AN URBAN DESIGN
PROBLEM
AND
URBAN DESIGN IS A STORMWATER
PROBLEM
Georgia Conservancy
 GC - Blueprints for Successful
Communities
 Sponsored by
 The Home Depot Foundation
 The Sartain ...
Why Stormwater?
 Research-based Blueprints for Successful
Communities
 Education through partnerships
 Statewide initia...
Regional Atlanta
Watersheds:
Upper Chattahoochee
Upper Middle
Chattahoochee
Upper Flint
Upper Ocmulgee
Etowah
Coosawattee
...
Understanding Stormwater
Management
 Stormwater problems have been defined
as the control of peak rates of runoff
from ne...
Criticism of Stormwater Management
Practices
 Evidence shows that end-of-pipe
stormwater solutions do not address
the hyd...
Low Impact Development (LID) – The New
Approach
 Stormwater management focuses
on both water quantity and water
quality
...
Stormwater and Urban Design
 The LID goal is to allow urban
development to occur in most
situations, but require that the...
Urban Design Studio:
Research + Design
Questions
HOW CAN URBAN DESIGN ADDRESS
STORMWATER SOLUTIONS?
HOW CAN STORMWATER ADD...
Stormwater in Context
 Four sites along the BeltLine,
where the BeltLine Subarea Plans
did not specifically address
storm...
4 SITES
PITTSBURGH, UNIVERSITY AVENUE
AND THE MCDANIEL CREEK
WATERSHED
EXISTING
CONDITIONS
WATERSHED ANALYSIS
HYDROLOGY
PART ONE: PITTSBURGH
NEIGHBORHOOD
PITTSBURGH NEIGHBORHOOD – STORMWATER
PLAN
GREEN STREETS
PITTSBURGH NEIGHBORHOOD
PART TWO: UNIVERSITY AVENUE
UNIVERSITY AVENUE SITE – SUBDIVISION (LOTS, BLOCKS,
STREETS)
Pittsburgh block width – 200 ft. – same as New York City – ac...
UNIVERSITY AVENUE STRATEGIES
UNIVERSITY AVENUE MASTER PLAN
BIRD’S EYE VIEW OF CENTRAL PARK
CENTRAL PARK – LOOKING SOUTH TOWARD THE BELTLINE
PART THREE: MCDANIEL BRANCH
MCDANIEL BRANCH
GREENWAY PLAN
MASTER PLAN
MADDOX PARK,
BOONE BLVD
AND THE
PROCTOR
CREEK
WATERSHED
EXISTING
CONDITIONS
HYDROLOGY
URBAN ANALYSIS
EXISTING PROPOSAL URBAN DESIGN STUDIO
PROPOSAL
ANSLEY MALL
CLEAR CREEK GREENWAY
AND WATERSHED
EXISTING
CONDITIONS
EXISTING SITE FEATURES
SCHEMES
STRATEGIES
PROPOSED
SECTIONS
SUBDIVISION PLANS AND PHASING
PERSPECTIVES OF NEW WATER SYSTEM
CLEAR CREEK GREENWAY
MASTER PLAN
COLONIAL HOMES, BOBBY JONES GOLF COURSE
AND THE PEACHTREE CREEK WATERSHED
EXISTING
CONDITIONS
URBAN DESIGN AND
STORMWATER TACTICS
STORMWATER PERFORMANCE
STORMWATER PERFORMANCE
ECO-GOLF COURSE
100 YEAR STORM EVENT
CONCLUSION 1
EVERY project –
public or private, no
matter how large or
how small, must
begin with an
understanding of its
...
CONCLUSION
2
The location of a
project in its
watershed shapes
both urban design and
stormwater
decisions.
For urban desig...
CONCLUSION
3
High performance site
design, for urban
design and
stormwater, can
combine greenways as
incentives for
revita...
CONCLUSION
4
Urban design can MANAGE
stormwater when
flooding cannot be
eliminated.
Combine retention and
detention in gre...
STORMWATER IS AN URBAN DESIGN
PROBLEM
AND
URBAN DESIGN IS A STORMWATER
PROBLEM
QUESTIONS?
Atlanta urban design and stormwater
Atlanta urban design and stormwater
Atlanta urban design and stormwater
Atlanta urban design and stormwater
Atlanta urban design and stormwater
Atlanta urban design and stormwater
Atlanta urban design and stormwater
Atlanta urban design and stormwater
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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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  • 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”
  • Atlanta urban design and stormwater

    1. 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. 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. 3. STORMWATER IS AN URBAN DESIGN PROBLEM AND URBAN DESIGN IS A STORMWATER PROBLEM
    4. 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. 5. Why Stormwater?  Research-based Blueprints for Successful Communities  Education through partnerships  Statewide initiatives and technical assistance
    6. 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. 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. 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. 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. 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. 11. Urban Design Studio: Research + Design Questions HOW CAN URBAN DESIGN ADDRESS STORMWATER SOLUTIONS? HOW CAN STORMWATER ADDRESS URBAN DESIGN SOLUTIONS?
    12. 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. 13. 4 SITES
    14. 14. PITTSBURGH, UNIVERSITY AVENUE AND THE MCDANIEL CREEK WATERSHED
    15. 15. EXISTING CONDITIONS
    16. 16. WATERSHED ANALYSIS
    17. 17. HYDROLOGY
    18. 18. PART ONE: PITTSBURGH NEIGHBORHOOD
    19. 19. PITTSBURGH NEIGHBORHOOD – STORMWATER PLAN
    20. 20. GREEN STREETS
    21. 21. PITTSBURGH NEIGHBORHOOD
    22. 22. PART TWO: UNIVERSITY AVENUE
    23. 23. UNIVERSITY AVENUE SITE – SUBDIVISION (LOTS, BLOCKS, STREETS) Pittsburgh block width – 200 ft. – same as New York City – accepts any density
    24. 24. UNIVERSITY AVENUE STRATEGIES
    25. 25. UNIVERSITY AVENUE MASTER PLAN
    26. 26. BIRD’S EYE VIEW OF CENTRAL PARK
    27. 27. CENTRAL PARK – LOOKING SOUTH TOWARD THE BELTLINE
    28. 28. PART THREE: MCDANIEL BRANCH
    29. 29. MCDANIEL BRANCH GREENWAY PLAN
    30. 30. MASTER PLAN
    31. 31. MADDOX PARK, BOONE BLVD AND THE PROCTOR CREEK WATERSHED
    32. 32. EXISTING CONDITIONS
    33. 33. HYDROLOGY
    34. 34. URBAN ANALYSIS
    35. 35. EXISTING PROPOSAL URBAN DESIGN STUDIO PROPOSAL
    36. 36. ANSLEY MALL CLEAR CREEK GREENWAY AND WATERSHED
    37. 37. EXISTING CONDITIONS
    38. 38. EXISTING SITE FEATURES
    39. 39. SCHEMES STRATEGIES
    40. 40. PROPOSED SECTIONS
    41. 41. SUBDIVISION PLANS AND PHASING
    42. 42. PERSPECTIVES OF NEW WATER SYSTEM
    43. 43. CLEAR CREEK GREENWAY MASTER PLAN
    44. 44. COLONIAL HOMES, BOBBY JONES GOLF COURSE AND THE PEACHTREE CREEK WATERSHED
    45. 45. EXISTING CONDITIONS
    46. 46. URBAN DESIGN AND STORMWATER TACTICS
    47. 47. STORMWATER PERFORMANCE
    48. 48. STORMWATER PERFORMANCE
    49. 49. ECO-GOLF COURSE 100 YEAR STORM EVENT
    50. 50. 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
    51. 51. 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
    52. 52. 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
    53. 53. 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
    54. 54. STORMWATER IS AN URBAN DESIGN PROBLEM AND URBAN DESIGN IS A STORMWATER PROBLEM
    55. 55. QUESTIONS?

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