tn.gov/environment

Andrea Ludwig, PhD, EIT

Assistant Professor

Biosystems Engineering and Soil Science

University of Tennessee Institute of Agriculture

July 25, 2013

TDEC  Permanent  Stormwater  Management  Manual  Update

tn.gov/environment

Authors and Contributors

•  Tennessee Department of Environment and Conservation •  Robby Karesh, Jennifer Watson, and the Internal Development Committee

•  Stormwater Management Assistance Research and Training Center (SMART Center) –  University of Tennessee, Institute of Agriculture

•  Drs. Daniel Yoder, John Tyner, John Buchanan, Andrea Ludwig; Paul Schmierbach; Steve Kenworthy; Brent Pilon; Maudy Budipradigdo

–  Tennessee Water Resources Research Center •  Tim Gangaware; Dr. Bruce Tschantz

tn.gov/environment

Municipal Separate Storm Sewer Systems (MS4s)

tn.gov/environment

   

§  EPA MS4 Permit Improvement Guide

§  TDEC programmatic experience implementing and evaluating MS4 effectiveness

§  Extensive comments and suggested language from stakeholders, including MS4s

Latest permits utilized:  

tn.gov/environment

Permanent Stormwater Management Requirements

§  New development and redevelopment projects must manage first inch of a rain event on site

tn.gov/environment

Permanent Stormwater Management Requirements

•  Runoff reduction

practices (Green Infrastructure)

§  New development and redevelopment projects must manage first inch of a rain event on site

tn.gov/environment

Permanent Stormwater Management Requirements

•  Runoff reduction

practices (Green Infrastructure)

•  Pollution reduction practices

§  New development and redevelopment projects must manage first inch of a rain event on site

tn.gov/environment

Permanent Stormwater Management Requirements

•  Runoff reduction

practices (Green Infrastructure)

•  Pollution reduction practices

•  MS4s can include off-site mitigation as an additional option

§  New development and redevelopment projects must manage first inch of a rain event on site

tn.gov/environment

What is Green Infrastructure?

•  “Green infrastructure is an approach that communities can choose to maintain healthy waters, provide multiple environmental benefits and support sustainable communities. Unlike single-purpose gray stormwater infrastructure, which uses pipes to dispose of rainwater, green infrastructure uses vegetation and soil to manage rainwater where it falls. By weaving natural processes into the built environment, green infrastructure provides not only stormwater management, but also flood mitigation, air quality management, and much more.” – USEPA website

Watershed  Scale  Neighborhood  Scale  

Site  Scale  

tn.gov/environment

Codes and Ordinances Review

§  Complete EPA Water quality scorecard to help MS4s evaluate, revise and develop codes, ordinances and incentives

§  MS4s can choose a combination of runoff and pollutant reduction practices

tn.gov/environment

§  Sources will include latest state and local manuals and guidance

§  TN manual must be regionally specific and minimize conflict with existing equivalent programs

§  Must be flexible to accommodate natural and built site limitations

TN Permanent Stormwater Manual:

tn.gov/environment

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tn.gov/environment

One Size Won’t Fit All

web.eecs.utk.edu  

tn.gov/environment

Permanent Stormwater Manual will include:

tn.gov/environment

§  Site assessment protocols (ie. existing site hydrologic conditions, special design considerations, etc.)

Permanent Stormwater Manual will include:

tn.gov/environment

§  Site assessment protocols (ie. existing site hydrologic conditions, special design considerations, etc.)

§  Design considerations and technical details for structural practices

Permanent Stormwater Manual will include:

vwrrc.vt.edu  

tn.gov/environment

§  Site assessment protocols (ie. existing site hydrologic conditions, special design considerations, etc.)

§  Design considerations and technical details for structural practices

§  Practice-specific installation, inspection and maintenance guidance

Permanent Stormwater Manual will include:

vwrrc.vt.edu  

tn.gov/environment

§  Site assessment protocols (ie. existing site hydrologic conditions, special design considerations, etc.)

§  Design considerations and technical details for structural practices

§  Practice-specific installation, inspection and maintenance guidance

§  Tennessee examples

Permanent Stormwater Manual will include:

vwrrc.vt.edu  

tn.gov/environment

§  Site design concepts at watershed, neighborhood and lot scales

Permanent Stormwater Manual will include:

tn.gov/environment

§  Site design concepts at watershed, neighborhood and lot scales

§  Infiltration and soil testing methodology

Permanent Stormwater Manual will include:

tn.gov/environment

§  Site design concepts at watershed, neighborhood and lot scales

§  Infiltration and soil testing methodology

§  Runoff reduction design tool and instruction

Permanent Stormwater Manual will include:

tn.gov/environment

§  Site design concepts at watershed, neighborhood and lot scales

§  Infiltration and soil testing methodology

§  Runoff reduction design tool and instruction

§  Plan review, construction and maintenance check lists

Permanent Stormwater Manual will include:

tn.gov/environment

Courses and fact-sheets will be based on the Permanent Manual and include:

§  Permanent SCM inspection and maintenance

§  Permanent SCM Design §  General education for

permanent SCM owners and operators

Training Courses and Fact Sheets

tn.gov/environment

Who is Contributing?

•  TDEC – Robby Karesh, Jennifer Watson, Internal

Development Committee

tn.gov/environment

Who is Contributing?

•  TDEC – Robby Karesh, Jennifer Watson, Internal

Development Committee •  SMART Center

tn.gov/environment

Who is Contributing?

•  TDEC – Robby Karesh, Jennifer Watson, Internal

Development Committee •  SMART Center •  External Stakeholder Committee

– Designers (ASCE and LA) – Development Community (Homebuilders of Am) – TNSA

tn.gov/environment

Who is Contributing?

•  TDEC – Robby Karesh, Jennifer Watson, Internal

Development Committee •  SMART Center •  External Stakeholder Committee

– Designers (ASCE and LA) – Development Community (Homebuilders of Am) – TNSA

•  You!

tn.gov/environment

§  Provide concerns or issues regarding use of runoff reduction practices for your organization or in your community

§  Identify regional or community specific natural or built site conditions that would limit implementation

§  Recommend practices to be added, revised or removed

§  Identify additional information or resources need by you or your organization to assist in the manual development

External Stakeholder Committee Participation

tn.gov/environment

We are not re-inventing the wheel…

•  Metro Nashville - http://www.nashville.gov/Water-Services/Developers/Low-Impact-Development.aspx

•  City of Chattanooga •  West Virginia -

http://www.dep.wv.gov/WWE/Programs/stormwater/MS4/Pages/StormwaterManagementDesignandGuidanceManual.aspx

•  Georgia - http://www.atlantaregional.com/environment/georgia-stormwater-manual/ •  Virginia - http://www.dcr.virginia.gov/stormwater_management/stormwat.shtml •  Michigan - http://www.semcog.org/LowImpactDevelopment.aspx •  Philadelphia - http://www.pwdplanreview.org/StormwaterManual.aspx •  New York - http://www.dec.ny.gov/chemical/29072.html •  Maryland -

http://www.mde.state.md.us/programs/Water/StormwaterManagementProgram/MarylandStormwaterDesignManual/Pages/Programs/WaterPrograms/SedimentandStormwater/stormwater_design/index.aspx

•  North Carolina - http://www.ces.ncsu.edu/depts/agecon/WECO/lidguidebook/

tn.gov/environment

History of Green Infrastructure and Low Impact Development

•  1992 – T. Scheuler Mitigating the Adverse Impacts of Urbanization on Streams: A Comprehensive Strategy for Local Government. In Watershed Restoration Sourcebook. Publication #92701 of the Metropolitan Washington Council of Governments, edited by P. Kumble and T. Schueler.

•  1999 – Low-Impact Development Design Strategies, Prince George’s County, Maryland

•  2009 – EPA Water Quality Score Card integrates Green Infrastructure

•  2010 – TN General MS4 Permit with GI requirements •  2014 – TN GI Manual Publication and Training

tn.gov/environment

Case Studies Show Results…

Barr  Engineering  Company  and  the  City  of  Burnsville,  Minnesota  (2002-­‐2003)    

tn.gov/environment

-­‐  95%  of  developers  use  bioretenCon  as  primary  stormwater  management  method  

-­‐  BioretenCon  has  become  commonly  accepted  

 

Stafford County, Virginia

USEPA,  2010  

tn.gov/environment

Targeted Audiences and End Users

•  Development Community – Designers (Engineers and Landscape Architects) – Developers

tn.gov/environment

Targeted Audiences and End Users

•  Development Community – Designers (Engineers and Landscape Architects) – Developers

•  MS4 Governments – Education – Plans Review –  Inspection – Enforcement

tn.gov/environment

Targeted Audiences and End Users

•  Development Community – Designers (Engineers and Landscape Architects) – Developers

•  MS4 Governments – Education – Plans Review –  Inspection – Enforcement

•  State Agency

tn.gov/environment

Guiding Principles

tn.gov/environment

Guiding Principles

•  Simple and Straightforward

tn.gov/environment

Guiding Principles

•  Simple and Straightforward •  Transparent and Clear

tn.gov/environment

Guiding Principles

•  Simple and Straightforward •  Transparent and Clear •  Inclusive of Existing Programs

tn.gov/environment

Guiding Principles

•  Simple and Straightforward •  Transparent and Clear •  Inclusive of Existing Programs •  Reflects Permit Intent

tn.gov/environment

tn.gov/environment

tn.gov/environment

tn.gov/environment

tn.gov/environment

tn.gov/environment

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tn.gov/environment

Questions? •  Andrea Ludwig

–  aludwig@utk.edu –  865.974.7238