City of Atlanta. Department of Watershed Management. Post-Development Stormwater Management Ordinance Summary of Revisions

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1 City of Atlanta Department of Watershed Management Post-Development Stormwater Management Ordinance Summary of Revisions Cory Rayburn, CPESC Environmental Program Manager Stormwater Training March 13, 2013 It is my goal for Atlanta to become one of the top tier sustainable cities in the nation - Mayor Kasim Reed

2 Impacts of Development Tree canopy and topsoil removal Compacted soils Impervious surfaces prevent infiltration Concentrated runoff Reduced base flow in streams Flashy watersheds Increased flooding Degraded streams & lakes

3 Impacts of Development Tree canopy and topsoil removal Compacted soils Impervious surfaces prevent infiltration Concentrated runoff Reduced base flow in streams Flashy watersheds Degraded streams

4 Problems of Urban Watersheds

5 Runoff Reduction Method AKA Green Infrastructure Mimics Natural Hydrology Capture the first 1.0 of stormwater runoff and infiltrate, evapotranspirate (uptake of water by plants), or reuse the runoff through rainwater harvesting Reduces volume of runoff AND removes pollutants Every land surface can act as stormwater Reduces amount of detention volume required

6 What is Green Infrastructure? Gray vs. Green Slow, Infiltrate, and Clean Stormwater

7 Examples of Green Infrastructure Soil Restoration Site Reforestation Green Roofs Permeable Pavements Undisturbed Pervious Areas (greenspace) Vegetated Filter Strips Downspout Disconnection Rain Gardens Stormwater Planters Dry wells Rainwater Harvesting Bioretention Infiltration Practices Dry Swales Grass Channels

8 Streets Vegetated Swales

9 Streets Stormwater Planters

10 Streets Curb Extensions Current Infrastructure Green Infrastructure Auburn Avenue Whitefoord Avenue

11 Streets Curb Extensions

12 Streets Permeable Paving

13 Permeable Alleys

14 Parking Lots Current Practice (Puritan Mill) Proposed Practice Domed Landscape Impermeable Surface Bioretention Curb Cut Permeable Paving

15 Parking Lots Permeable Paving

16 Parking Lots Bioretention / Islands

17 Parking Lots Bioretention / Islands

18 Bioretention Atlanta s Adair Park

19 Atlanta City Hall Green Roof

20 City Hall Green Roof

21 Green Roofs Woodruff Arts Center Modular Green Roof, Installed 2008

22 Green Roofs Woodruff Arts Center Modular Green Roof, Installed 2008

23 Rainwater Harvesting (Source: Jones and Hunt, 2008)

24 Rainwater Harvesting Rigler Rainwater Harvesting Southface Rooftop cistern

25 Why Green Infrastructure? Addresses stormwater at its source Flood protection - increases capacity in our Combined/Separate storm sewers and creeks Promotes sustainability - alleviates the impacts of urban heat islands, reduces energy demand, improves air quality, and increases carbon sequestration Potential cost savings Enhances aesthetics of community

26 Rate Reduction (Detention) Previous Ordinance - 30% reduction in Q (peak rate of discharge) of all major storm events (up to 100-yr storm) Problem: Size of detention ponds/vaults increases substantially when reducing the discharge rate of the 100-yr storm event Revised Requirement New Development (Greenfield) cannot increase predevelopment peak rate, up to the 100-yr storm event. Redevelopment must reduce peak rate (up to 50%) based on the pre-development impervious cover, up to the 25 year storm. PIC = Pre-development Impervious Cover PDR = Peak Discharge Rate reduction

27 Single Family Residences New Homes or Large Additions (>1,000 square feet) Required to capture and treat first 1.0 of runoff ONLY (no detention requirements) COA Stormwater Guidelines: Green Infrastructure for Single Family Residences Provides a list of acceptable BMPs for SFR based on impervious coverage and drainage Reduces the need for complicated calculations Provides tear-off details and construction specification for each BMP Simplifies the review and approval process

28 SFR Guidance Document

29 Tear Off Detail Sheets

30 Appendices

31 Examples of RR techniques for SFR Simplified Rain garden Routing downspouts to underground dry wells Replacing traditionally impervious surfaces (patios, parking areas, etc.) with pervious pavers or porous concrete Utilizing cisterns for reuse or irrigation Directing sheet flow to adequately vegetated buffers Any appropriate combination of techniques.

32 Rain Garden

33 Rain Garden

34 Rain Garden

35 Cisterns

36 Dry Wells

37 Dry Wells (Source: Maryland Department of the Environment, 2000)

38 Modified French Drain

39 Permeable Paver Parking Areas

40 Stormwater Concept Plan Require a consultation meeting and a concept plan prior to Full Design (not for SFR lots) Prior to Building Permit application Ensures that the engineer, developer, and owner are aware of the stormwater regulations prior to a full blown design Results in a quicker review process and prevent redesigning site plans and stormwater facilities

41 Existing Detention Ponds Stormwater facilities permitted and installed prior to the current Post Development Stormwater Ordinance (2004) must be maintained in accordance with recorded indemnity agreements. Proposed Ordinance allows enforcement of the maintenance of these facilities.

42 City Hall Green Roof Past Projects Built Demonstration Project Green Stormwater Infrastructure in Atlanta

43 Past Projects Historic Fourth Ward Park Opened Combined Sewer Capacity relief Green Stormwater Infrastructure in Atlanta

44 Fire Station #16 Rain Garden Past Projects Built Demonstration. EPA, EPD, COA, UGA, WAWA Green Stormwater Infrastructure in Atlanta

45 Current Projects McDaniel Branch Stream Restoration and Constructed Wetlands Water Quality Project. US Corps of Engineers and EPA 319 Funding. Green Stormwater Infrastructure in Atlanta

46 Current Projects Juniper St. Green Street Improvements In Permitting. Included in Streetscape Improvements. Midtown Alliance funded Green Stormwater Infrastructure in Atlanta

47 Boone Blvd Green Street Current Projects Demonstration. EPA Tech. Asst. Grant Green Stormwater Infrastructure in Atlanta

48 Green Stormwater Infrastructure in Atlanta Peoplestown

49 Current Projects South East Atlanta Stormwater Improvements Combined Sewer Capacity Relief Green Stormwater Infrastructure in Atlanta

50 Current Projects South East Atlanta Stormwater Improvements Combined Sewer Capacity Relief Green Stormwater Infrastructure in Atlanta

51 Current Projects South East Atlanta Stormwater Improvements Combined Sewer Capacity Relief Green Stormwater Infrastructure in Atlanta

52 Why this? Why now? Addressed problems in the old ordinance MS4 / NPDES Permits Requirements to remove barriers to Green Infrastructure CSO capacity relief Opportunity for Atlanta to set standards Improve and protect watersheds It is my goal for Atlanta to become one of the top tier sustainable cities in the nation - Mayor Kasim Reed

53 Questions? Cory Rayburn Office of Watershed Protection

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