Sustainable Stormwater Management for Compliance with the Energy Independence and Security Act of Section 438 Session 8015

Transcription

1 Sustainable Stormwater Management for Compliance with the Energy Independence and Security Act of Section 438 Session 8015 Steven P. Roy, LEED AP Associate, Geosyntec Consultants, Inc. sroy@geosyntec.com Ganesh Krishnan, PE, CPESC Associate, Geosyntec Consultants gkrishnan@geosyntec.com

2 Outline Text and Intent of Energy Independence and Security Act (EISA) Section 438 Summary of current draft guidance for implementation Examples of Sustainable Stormwater Management Approaches Recommendations

3 Text of Section 438: EISA Section 438 Storm water runoff requirements for federal development projects. The sponsor of any development or redevelopment project involving a Federal facility with a footprint that exceeds 5,000 square feet shall use site planning, design, construction, and maintenance strategies for the property to maintain or restore, to the maximum extent technically feasible, the predevelopment hydrology of the property with regard to the temperature, rate, volume, and duration of flow.

4 Intent of EISA Section 438 The intent of Section 438 of the Energy Independence and Security Act (EISA) is to require federal agencies to develop and redevelop applicable facilities in a manner that reduces stormwater runoff and associated pollutant loadings in order to protect or restore the waters of the U.S.

5 Maximum Extent Technically Feasible (METF) Stormwater control practices that are effective in reducing the volume of stormwater discharge must be used. The Federal facility must use all known, available and reasonable methods of stormwater retention and/or reuse to prevent the off site discharge of stormwater runoff consistent with the performance standard. In cases when a facility seeks or claims an exception, it is expected that there will be a serious and documented attempt to comply.

6 Draft Guidance - Contents Outlines intent Describes methods of applying the standard: Precipitation event-based calculation Continuous simulation calculations Provides definition of MEFT and process to demonstrate infeasibility Discusses costs Presents case studies that demonstrate the feasibility of meeting the intent of the requirement

7 Development increases stormwater volume, peak flow, and duration Post Development Hydrograph Q= flow rate t= time

8 Forested Land Cover

9 Urbanized Land Cover

10 Performance Options Option 1 : Control 95th Percentile Rainfall Event Manage rainfall onsite Infiltrate, Evapotranspirate, Harvest and Infiltrate, and Reuse Runoff Note: The 95th percentile rainfall event is the event whose precipitation total is greater than or equal to 95 percent of all 24-hour storms on an annual basis.

11 95% Storm Event City 95th Percentile Event Rainfall Total (in) City 95th Percentile Event Rainfall Total (in) Atlanta, GA 1.8 Kansas City, MO 1.7 Baltimore, MD 1.6 Knoxville, TN 1.5 Boston, MA 1.5 Louisville, KY 1.5 Buffalo, NY 1.1 Minneapolis, MN 1.4 Burlington, VT 1.1 New York, NY 1.7 Charleston, WV 1.2 Salt Lake City, UT 0.8 Coeur D Alene, ID 0.7 Phoenix, AZ 1 Cincinnati, OH 1.5 Portland, OR 1 Columbus, OH 1.3 Seattle, WA 1.6 Concord, NH 1.3 Washington, DC 1.7 Denver, CO 1.1

12 Performance Options Option 2: Preserve predevelopment hydrology (rate, volume, duration & temperature) Conduct hydrologic and hydraulic analyses Quantify post-construction hydrographs for the following storm sizes: 1, 2, 10 and 100 year 24 hour storm events Maintain pre-development hydrographs for these storm events

13 Performance Options What if Options 1 and 2 are not technically feasible? Conduct site evaluation and assessment If site conditions or other factors preclude achievement of Options 1 or 2, i.e., neither is technically feasible Agency/Department follows a process to employ onsite practices to the METF Agency/Department documents stormwater design based on METF and other factors

14 MEFT and Infeasibility Guidance definition of MEFT: To meet the intent of the statute, the Federal facility must use all known, available and reasonable methods of stormwater retention and/or reuse to prevent the off site discharge of stormwater runoff consistent with the performance standard. Demonstrating Infeasibility: In cases when a facility seeks or claims an exception, it is expected that there will be a serious and documented attempt to comply. Documentation should include, but may not be limited to, engineering calculations, geologic reports, hydrologic analyses, and site maps.

15 Sustainable Stormwater Management Low Impact Development Stormwater Designs Green roofs Trees and tree boxes Raingardens/bioretention/infiltration planters Vegetated swales Pocket wetlands Permeable pavements Reforestation/revegetation Site planning- protection of riparian buffers/floodplains Rainwater harvesting/reuse (where allowed)

16 Low Impact Development An ecosystem-based approach to land development and stormwater management. Goal: Mimic pre-development site hydrology

17 Basic LID Principles Conserve natural areas Minimize development impacts Maintain site runoff rate Use integrated stormwater management practices Implement pollution prevention, proper maintenance and public education programs

18 Conventional vs. LID Approach to Stormwater Conventional Collect Convey Discharge LID Approach Reduce volume Minimize impacts Distributed controls Treatment trains Infiltration Hybrid systems Mimic the predevelopment hydrology

19 Denver EPA Building

20 Denver EPA Building

21 Denver EPA Building

22 EPA Potomac Yard, Arlington, VA

23 EPA Del Rios Building, Wash. D.C.

24 EPA Del Rios Building, Wash. D.C.

25 US Navy Monterey Post Graduate Naval Academy Installed 30,000 Square Feet of Permeable Pavers Photo Credit: Belgard Pavers

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27 US Navy Yard, Wash. D.C.

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29 100 ft Bioretention Cell in Parking Lot

30 Filterra Stormwater Treatment Unit

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33 GravelPave and Porous Pavers

34 FlexiPave recycled rubber tires and aggregate

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36 35,000 Sq Ft Pervious Concrete Park & Ride VTDOT Randolph, Vermont - Sept 08 Monitoring underway to evaluate effectiveness Photo: Northern New England Concrete Promotion Association

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40 Constructed Wetland with Stone Baffles (Plymouth, MA)

41 Fully Stabilized Vegetated Buffer

42 Residential Raingardens

43 Rain Gardens like this one in Winooski,Vermont are catching on throughout The US Photo: Emma Melvin, UVM

44 Infiltrating Planter Box for Roof Runoff (Plymouth, MA)

45 Leadership in Energy and Environmental Design -LEED and Stormwater Management

46 What is LEED Green Building Rating System Developed by the US Green Building Council ( Voluntary, consensus-based market driven rating system based on existing proven technology Rating System Defines Green Building Performance-oriented system where credits are earned for satisfying criteria related to environment design, construction and performance

47 LEED for New Construction and Major Renovation (Version 2.2) Formally referred to as LEED-NC Recognizes performance in six key areas: Sustainable site development Water savings Energy & atmosphere Materials and resources selection Indoor environmental quality and Innovation in design

48 LEED and LID New Construction and Major Renovation V2.2 - Minimum of 26 Points Required Possible LEED Credits Using LID Approaches Sustainable Sites Credit 3 Brownfield Redevelopment 1 Sustainable Sites Credit 6.1 Stormwater Management, Stormwater Quantity Control Sustainable Sites Credit 6.2 Stormwater Management, Treatment- Use BMPs to Treat 90% of the average annual rainfall amount. Sustainable Sites Credit 7.1 Landscape and Interior Design to Reduce Heat Island, Non Roof Sustainable Sites Credit 7.2 Landscape and Interior Design to Reduce Heat Island, Roof green roofs

49 LEED and LID New Construction and Major Renovation V2.2 - Minimum of 26 Points Required Possible LEED Credits Using LID Approaches Credit 1.1 Water Efficient Landscaping, Reduce use by 50% 1 Credit 1.2 Water Efficient Landscaping, No Potable Water Use or Landscaping 1 Credit 2 Innovative Wastewater Technologies, Constructed wetlands, Filtration, etc. Materials and Resources Credit 4.1 Recycled Content, 10% 1 1 Materials and Resources Credit 4.2 Recycled Content, 20% 1

50 LEED and LID New Construction and Major Renovation V2.2 - Minimum of 26 Points Required Possible LEED Credits Using LID Approaches Materials and Resources Credit 5.1 Local/Regional Materials, 10% extracted, processed and manufactured Regionally Materials and Resources Credit 5.2 Local/Regional Materials, 20% extracted, processed and manufactured Regionally Innovation in Design Total LID Credits Achievable More Than Halfway There! 15

51 INTERAGENCY SUSTAINABILITY WORKING GROUP Technical Guidance on Implementing Section 438 of the Energy Independence and Security Act, distributed to ISWG The ISWG is composed of members representing 20 major Federal departments and a number of independent agencies. The Interagency Sustainability Working Group (ISWG) was established in September 2001 in response to Executive Order Greening the Government Through Efficient Energy Management. Under EO Strengthening Federal Environmental, Energy, and Transportation Management, issued in January 2007, the ISWG was charged with providing interagency assistance for implementing the EO sustainable building design requirements. able_workinggroup.html

52 Recommendations Federal facilities may have serious site constraints to effectively manage stormwater to METF Consider the range of LID techniques that will fit with your site and proposed building design or renovation Make stormwater control features multi-purpose or sustainable Document the conditions on your site e.g. soils, high groundwater, contamination, etc. that help make the case for an exemption or to document your attempt to achieve METF Prepare a defensible exception to the performance standards presented in the guidance Attempt some form of stormwater infiltration or evapotransporation or capture and reuse system Follow the examples from other DOD and federal facilities that have implemented LID techniques

53 Questions