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Low Impact Development
In the Houston Region


Perspectives:
 Design       Margaret Robinson   Asakura Robinson Co.
 Construction David Batts         Construction Eco Services
 Agency       Nick Russo          Harris County Public Infrastructure Dept.




                                                              Landscape Architecture
                                                              Urban Design
                                                              Planning
Houston Land Water Sustainability Forum (HLWSF)
OBJECTIVES:
        Explore land/water related practices, methods, technologies and materials which may
        provide economic benefit and improve quality of life in the greater Houston area.

         To weight our focus on practical applications rather than theoretical concepts.

         To promote the implementation of practices that protect our land and water resources.

         To engage the broadest possible range of constituencies, including public agencies, in
         order to facilitate and speed adoption of practices.

         To track the progress of adoption and implementation of sustainable land/water practices

 Bob Adair-Steering Committee Chair, International Erosion Control Association (SCIECA)
 US Green Building Council (USGBC)
 American Society of Civil Engineers (ASCE), Houston Council of Engineering Companies (HCEC)
 American Society of Landscape Architects (ASLA), American Institute of Architects, Houston (AIA)
 Associated General Contractors of America (AGC), Greater Houston Builders Association (GHBA)
 Houston-Galveston Area Council (H-GAC)
 Harris County Public Infrastructure Dept., Harris County Flood Control District (HCFCD)
 City of Houston, Public Works, Engineering and Code Enforcement Departments
 Texas Department of Transportation (TXDOT)
 Bayou Preservation Association (BPA)
 Energy Corridor District
 Texas Coastal Watershed Program
LID-low impact development – what is it?
LID is an approach to land development that works with nature to
manage stormwater as close to its source as possible.

LID employs principles such as preserving and recreating natural
landscape features, minimizing imperviousness to create functional
and appealing site drainage that treats stormwater as a resource rather
than a waste product.

There are many practices that have been used to adhere to these             Westpark Tollway
principles such as bioretention facilities (bioswales), vegetated swales,
rain gardens, vegetated rooftops (greenroofs), rain barrels, tanks and
cisterns, and permeable pavements.

LID Works Everywhere
LID can be applied to new development, redevelopment, or as retrofits
to existing development. LID has been adapted to a range of land uses
from high density ultra-urban settings to low density development.

LID and Green Infrastructure
                                                                            Citation Campus
EPA intends the term "green infrastructure" to generally refer to
systems and practices that use or mimic natural processes to infiltrate,
evapotranspirate or reuse stormwater or runoff on the site where it is
generated.

http://www.epa.gov/owow/NPS/lid/

                                                                            Gene Green Park
LID-benefits
 Filters stormwater through plants /engineered soil mixes-
 removes 80%+ pollutants, total suspended solids (TSS) and
 heavy metals

 Diverts floatable trash from stormwater systems, bayous, lakes
                                                                  Horn Elementary
 Provides detention volume within media, swales, reservoirs

 Bioswales may reduce drainage system costs by up to 30%

 Captures rainwater for use as a resource rather than discarded
 as a waste product

 Adds landscape area

 Creates wildlife and native plant habitat                        Dickenson Library


 Contributes to LEED, Sustainable Sites, Green Roadway and
 Living Building Challenge point systems

 Encourages coordination between Engineers, Hydrologists,
 Landscape Architects, Architects, Contractors, Maintenance
 Programs, Clients
                                                                    Meador Library
LID projects-constructed
2009   Gene Green Park                  Harris County Precinct 2
2009   Kendall Library                  City of Houston, English Assoc. Arch.
2009   Federal Reserve Bank-Bioswales
2009   Houston Arboretum
2009   Inverness Residence              Strasser Ragni Arch.
2010   Meador Library                   Harris County Precinct 2, English Assoc. Arch.
2010   Firestation 90                   City of Houston, English Assoc. Arch
2010   Lonestar College Conroe Campus
2010   Westside Senior Educ. Center     Harris County Precinct 3, BNIM
2010   Westchase Drainage Corridor      Westchase Manage. District
2010   New Hope Housing, Sakowitz       Val Glitsch Arch.
2011   Horn Elementary School           HISD, English Assoc. Arch.
2011   Lonestar College Atascocita Campus
2011   Lonestar College Victory Center
2011   Dickenson Library Rain Garden    TX AgriLife
2011   Peck Elementary School           Taft Architects
2011   Federal Reserve Bank-Green Roof
2011   DeChaumes Elementary             HISD, ArcTec Assoc.
LID projects-in design/construction
2012   Bagby St. Reconstruction        Midtown Manag. Dist., WPMoore Eng.
2012   New Hope Housing, Rittenhouse Glassman Shoemake Maldonado Arch.
2012   Sherwood Forest Montessori      English Assoc. Arch.
2012   McKenzie Park Subdivision       Peron Dev.
2012   SARA Stormwater Audit           URS
2012   MD Anderson Park                Vaughn Construction
2012   Carnegie Vanguard High School HISD, Rey de la Reza Architects
2012   Brazoria County Parks: Quintana Beach Resoft, Mohawk and Follet’s Island
2012   Lockhart-Turner Elementary      HISD, Harrison Kornberg Arch.
2013   N. Main St.,                    Harris County Pct. 2 Dannenbaum Eng.
2013   TAMU Joint Library Facility     Harrison Kornberg Arch.
2013   Mandell Park                    Houston Parks Board, Friends of Mandell Park
2014   Memorial Running Center         MPC, Kirksey Arch.
2014   Almeda Blvd. Reconstruction     City of Houston, TXDOT, WPMoore Eng.
2014   Springwoods Village, Dr. Cor.   Coventry Dev., Design Workshop, WPM
2014   Historic Holman Street Recons. OST Almeda TIRZ
2014   Halls & Inwood Detention Basins COH, WPM/Dodson
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                                        1919 DECATUR STREET


                          Raingarden (Bioretention Cells)
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                     FEDERAL RESERVE HOUSTON



                          Bioswale
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                                           MEADOR LIBRARY



                          Bioswale with Underground Rain Tank
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                     GENE GREEN PARK

                          Bioswale
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                                   LONESTAR COLLEGE ATASCOCITA


                          Raingarden (Bioretention Cells)
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                     LONESTAR COLLEGE ATASCACITA




                          Bioswale
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement



                                     PECK ELEMENTARY




                          Bioswale
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                     L. Coffman
                          Bioswale
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                      McKenzie Park
                          Bioswales
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                       RESIDENCE IN HOUSTON


                          Green Roof
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                       FEDERAL RESERVE HOUSTON

                          Green Roof
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                       FEDERAL RESERVE HOUSTON

                          Green Roof
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                     FIRESTATION 90



                          Cisterns
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                               BAKER RIPLEY CENTER



                          Cisterns
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                     NEW HOPE HOUSING SAKOWITZ


                          Cisterns
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                     HOUSTON ARBORETUM




                          Cisterns
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                                   KEMPWOOD MANOR
                          Permeable Pavement - Pavers
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                                   KEMPWOOD MANOR.


                          Permeable Pavement - Pavers
The LID
 Toolbox
Bioswales / Raingardens
Green Roofs
Cisterns / Tanks
Permeable Pavement




                                                          FIRESTATION 90


                          Permeable Pavement - Concrete
LEED Points

Sustainable Sites

Water Efficiency

Innovation in
Design




                    12+ Points Available Using LID Techniques
LID in LEED         Same LID solution works for:

                    • SS 6.1: Stormwater Design – Quality Control
Can be applied to
12+ points          • SS 6.2: Stormwater Design – Quantity Control
Underutilized       • SS 7.1: Heat Island Effect – Non-roof

                    • WE 1: Water Efficient Landscaping

                    Low maintenance does not mean NO
                      maintenance – use LID to augment irrigation.
Economics Drives Ecology in Today’s Business Environment
Selling Low Impact Development on Economics

          What Are The Existing Costs?
           – Opportunity Costs – Real Estate for Detention Systems
           – Upfront System Costs – Storm Sewer & Water Quality Systems
           – Long-term Maintenance Costs


          What Opportunities Exist?
           – How can we use drainage as an amenity?
           – How can we increase property values?
           – How can we create a better sense of place?
Cost Distribution
Traditional Site Design Vs. Low Impact Development




      Site                                   Site
      Furnishings     Drainage               Furnishings
                                                              Hardscapes
  Design Svs                              Design Svs                $$$$$$$

    Softscapes      Hardscapes                         Softscapes
Queenston Manor
Proving the Opportunity LID Affords Developers

   Typical
   detention
   storage

   7 residential
   buildings

   7.4 acres
Queenston Manor
Proving the Opportunity LID Affords Developers

    LID design
    spreads
    drainage
    throughout site
    as an amenity

    Redesign
    yielded 2
    additional
    buildings
    48 more
    apartment
    units
Queenston Manor
Proving the Opportunity LID Affords Developers
Lessons Learned
The System is Greater Than the Sum of It’s Parts
  Media Performance is the Critical Component
  Eliminate Choke Points in the Media Section
  Match Underdrain to Media
  Protect the System
Media Performance
A Better Understanding of Nature
Understanding Media Performance Will Improve System Functionality

Verifying Performance Will Insure Long Term Functionality
Choke Points
Fabrics are the Achilles Heel of LID
Bridge Media With Aggregate / Do Not Separate Media From Aggregate

Require Bridging Analysis in Specifications



                                                                      Engineered Media           -




                                                        12” – 48”
                                                                      70% Sand                       -
                                                                      25% Organic or Inorganic           -
                                                                      >5% Silt / Clay / Fines




                                                        3” – 6”
                                                                      Intermediate Layer         -
                                                                      Fine Gravel 2mm – 4mm




                                                         12” – 60”
                                                                     Drainage Layer
                                                                     - Pea Gravel 1/4” – 3/8”
Systems Parts Must Match Performance
Underdrain Flow Must Match Media Flow
Perforated Pipe Has 2” of Orifice Opening Per Linear Foot

For High Flow Soils, Look To Higher Performing Underdrain Systems
Protect The System
Good Designs Are Compromised if Proper Protection is Neglected
Stabilize the Side Slopes ASAP / Do Not Wait For Construction to Commencer

Protect the Soils During Construction / An Ounce or Prevention is Worth a Gallon of Cure
Installation of Biofiltration System
Copper State Rubber
Installation of Biofiltration System
Copper State Rubber
developing LID criteria

  Adopted April 2011
  Only County in TX with LID criteria.
  Optional, not every project must be LID.

  YOU MUST HAVE A
  PRE-PROJECT MEETING
developing LID criteria
  Stakeholder review & public interest
  County interest
     Alternative designs, tools, BMPs
     Storm water management (quantity & quality)
     EPA Requirements
  TCEQ MUD re-imbursements
     Expect criteria to allow for MUD reimbursement for
     LID projects
storm water quality
  Increased treatment, similar to LEED.
  Treatment of the 1” Water quality volume.
  Although not specified, we believe the LID practices
  will generally result in 80% TSS removal.
  All LID based projects >1acre receive a SWQ permit.
engineered soil media
  Treat the first 1” of runoff volume
  Safety factor of 2.
  actual design capacity of the soil is to be 60”/hr to
  meet the 30”/hr criteria with safety factor.
  In situ test (see Appendix B).
development considerations



                        Specific considerations for
                        development types:
                             Public Streets
                             Commercial Developments
                             Subdivisions

                             Ownership & Maintenance.
                             Safety cannot be compromised.
                             Safe conveyance of the 100 year
                             event.
LID projects

   We’re gaining experience in LID projects, similar to
   our LEED experience.
   Past projects: Evelyn Meador Library, Gene Greene
   Park
   Roadways:
     Birnamwood Dr. – (under construction)
     N. Main – (in design)
     A 3rd, (under evaluation).
Birnamwood drive – HC Pct 4




    East of I-45, North of Cypresswood.
    Road leads to Pct 4’s John Pundt Park & Spring Creek Greenway.
    First LID-road project in our region.
Birnamwood drive




   LID roadway section

                         Floodplain mitigation
Birnamwood Drive & False inlets.
                              Curb
                                  Storm Sewer at
                                  outfalls only.




32 ft median.
native plants, trees,
grasses.
Planting plan




    Engineered Soils
Clearing: August 2011
Bioswale




September 2011
Bioswale




October 2011
Bioswale




January 13 2012
April 03 2012
Gulf Coast Green 2012 Margaret Robinson
Bioswale


                Engineered Soils




April 24 2012
final design components
Planning considerations
   Consider the project goal
   Evaluate project costs
   Visualize the landscape plan
   Determine vegetation establishment
our first experience
   Eliminated offsite detention; reduced our floodplain
   mitigation pond. -Reduced wetland impact. –SWQ treatment.
   Saved ROW cost.
   Saved cost of Storm sewer.
   Reduced mowing to 1-2x/year.
   Enhanced landscaping, warranty, irrigation.
   Gained aesthetic benefit (road to Park).
   Utilized 2 Bid packages (road & landscape).
   Still evaluating all costs as we move through construction
   (SWPPP, Extra work items, plants).
   Next time- evaluate landscaping and seeding, single bid
   package
resources

www.houstonlwsforum.org
Houston Land/Water Sustainability Forum

www.TexasLID.org
a centralized, accessible resource for important information and guidelines for
effectively implementing Low Impact Development (LID), or Green Infrastructure,
practices and policies across Texas. The website is collaborative effort between:
      Lady Bird Johnson Wildflower Center, Ecosystem Design Group
      The Center for Research in Water Resources, University of Texas at Austin
      The Texas Commission on Environmental Quality (TCEQ)

www.asla.org
Banking on Green: A Look at How Green Infrastructure Can Save Municipalities
Money and Provide Economic Benefits Community-wide. Joint report by American
Rivers, the Water Environment Federation, and the American Society of Landscape
Architects and ECO Northwest – April 2012

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Gulf Coast Green 2012 Margaret Robinson

  • 1. Low Impact Development In the Houston Region Perspectives: Design Margaret Robinson Asakura Robinson Co. Construction David Batts Construction Eco Services Agency Nick Russo Harris County Public Infrastructure Dept. Landscape Architecture Urban Design Planning
  • 2. Houston Land Water Sustainability Forum (HLWSF) OBJECTIVES: Explore land/water related practices, methods, technologies and materials which may provide economic benefit and improve quality of life in the greater Houston area. To weight our focus on practical applications rather than theoretical concepts. To promote the implementation of practices that protect our land and water resources. To engage the broadest possible range of constituencies, including public agencies, in order to facilitate and speed adoption of practices. To track the progress of adoption and implementation of sustainable land/water practices Bob Adair-Steering Committee Chair, International Erosion Control Association (SCIECA) US Green Building Council (USGBC) American Society of Civil Engineers (ASCE), Houston Council of Engineering Companies (HCEC) American Society of Landscape Architects (ASLA), American Institute of Architects, Houston (AIA) Associated General Contractors of America (AGC), Greater Houston Builders Association (GHBA) Houston-Galveston Area Council (H-GAC) Harris County Public Infrastructure Dept., Harris County Flood Control District (HCFCD) City of Houston, Public Works, Engineering and Code Enforcement Departments Texas Department of Transportation (TXDOT) Bayou Preservation Association (BPA) Energy Corridor District Texas Coastal Watershed Program
  • 3. LID-low impact development – what is it? LID is an approach to land development that works with nature to manage stormwater as close to its source as possible. LID employs principles such as preserving and recreating natural landscape features, minimizing imperviousness to create functional and appealing site drainage that treats stormwater as a resource rather than a waste product. There are many practices that have been used to adhere to these Westpark Tollway principles such as bioretention facilities (bioswales), vegetated swales, rain gardens, vegetated rooftops (greenroofs), rain barrels, tanks and cisterns, and permeable pavements. LID Works Everywhere LID can be applied to new development, redevelopment, or as retrofits to existing development. LID has been adapted to a range of land uses from high density ultra-urban settings to low density development. LID and Green Infrastructure Citation Campus EPA intends the term "green infrastructure" to generally refer to systems and practices that use or mimic natural processes to infiltrate, evapotranspirate or reuse stormwater or runoff on the site where it is generated. http://www.epa.gov/owow/NPS/lid/ Gene Green Park
  • 4. LID-benefits Filters stormwater through plants /engineered soil mixes- removes 80%+ pollutants, total suspended solids (TSS) and heavy metals Diverts floatable trash from stormwater systems, bayous, lakes Horn Elementary Provides detention volume within media, swales, reservoirs Bioswales may reduce drainage system costs by up to 30% Captures rainwater for use as a resource rather than discarded as a waste product Adds landscape area Creates wildlife and native plant habitat Dickenson Library Contributes to LEED, Sustainable Sites, Green Roadway and Living Building Challenge point systems Encourages coordination between Engineers, Hydrologists, Landscape Architects, Architects, Contractors, Maintenance Programs, Clients Meador Library
  • 5. LID projects-constructed 2009 Gene Green Park Harris County Precinct 2 2009 Kendall Library City of Houston, English Assoc. Arch. 2009 Federal Reserve Bank-Bioswales 2009 Houston Arboretum 2009 Inverness Residence Strasser Ragni Arch. 2010 Meador Library Harris County Precinct 2, English Assoc. Arch. 2010 Firestation 90 City of Houston, English Assoc. Arch 2010 Lonestar College Conroe Campus 2010 Westside Senior Educ. Center Harris County Precinct 3, BNIM 2010 Westchase Drainage Corridor Westchase Manage. District 2010 New Hope Housing, Sakowitz Val Glitsch Arch. 2011 Horn Elementary School HISD, English Assoc. Arch. 2011 Lonestar College Atascocita Campus 2011 Lonestar College Victory Center 2011 Dickenson Library Rain Garden TX AgriLife 2011 Peck Elementary School Taft Architects 2011 Federal Reserve Bank-Green Roof 2011 DeChaumes Elementary HISD, ArcTec Assoc.
  • 6. LID projects-in design/construction 2012 Bagby St. Reconstruction Midtown Manag. Dist., WPMoore Eng. 2012 New Hope Housing, Rittenhouse Glassman Shoemake Maldonado Arch. 2012 Sherwood Forest Montessori English Assoc. Arch. 2012 McKenzie Park Subdivision Peron Dev. 2012 SARA Stormwater Audit URS 2012 MD Anderson Park Vaughn Construction 2012 Carnegie Vanguard High School HISD, Rey de la Reza Architects 2012 Brazoria County Parks: Quintana Beach Resoft, Mohawk and Follet’s Island 2012 Lockhart-Turner Elementary HISD, Harrison Kornberg Arch. 2013 N. Main St., Harris County Pct. 2 Dannenbaum Eng. 2013 TAMU Joint Library Facility Harrison Kornberg Arch. 2013 Mandell Park Houston Parks Board, Friends of Mandell Park 2014 Memorial Running Center MPC, Kirksey Arch. 2014 Almeda Blvd. Reconstruction City of Houston, TXDOT, WPMoore Eng. 2014 Springwoods Village, Dr. Cor. Coventry Dev., Design Workshop, WPM 2014 Historic Holman Street Recons. OST Almeda TIRZ 2014 Halls & Inwood Detention Basins COH, WPM/Dodson
  • 7. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement 1919 DECATUR STREET Raingarden (Bioretention Cells)
  • 8. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement FEDERAL RESERVE HOUSTON Bioswale
  • 9. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement MEADOR LIBRARY Bioswale with Underground Rain Tank
  • 10. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement GENE GREEN PARK Bioswale
  • 11. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement LONESTAR COLLEGE ATASCOCITA Raingarden (Bioretention Cells)
  • 12. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement LONESTAR COLLEGE ATASCACITA Bioswale
  • 13. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement PECK ELEMENTARY Bioswale
  • 14. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement L. Coffman Bioswale
  • 15. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement McKenzie Park Bioswales
  • 16. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement RESIDENCE IN HOUSTON Green Roof
  • 17. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement FEDERAL RESERVE HOUSTON Green Roof
  • 18. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement FEDERAL RESERVE HOUSTON Green Roof
  • 19. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement FIRESTATION 90 Cisterns
  • 20. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement BAKER RIPLEY CENTER Cisterns
  • 21. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement NEW HOPE HOUSING SAKOWITZ Cisterns
  • 22. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement HOUSTON ARBORETUM Cisterns
  • 23. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement KEMPWOOD MANOR Permeable Pavement - Pavers
  • 24. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement KEMPWOOD MANOR. Permeable Pavement - Pavers
  • 25. The LID Toolbox Bioswales / Raingardens Green Roofs Cisterns / Tanks Permeable Pavement FIRESTATION 90 Permeable Pavement - Concrete
  • 26. LEED Points Sustainable Sites Water Efficiency Innovation in Design 12+ Points Available Using LID Techniques
  • 27. LID in LEED Same LID solution works for: • SS 6.1: Stormwater Design – Quality Control Can be applied to 12+ points • SS 6.2: Stormwater Design – Quantity Control Underutilized • SS 7.1: Heat Island Effect – Non-roof • WE 1: Water Efficient Landscaping Low maintenance does not mean NO maintenance – use LID to augment irrigation.
  • 28. Economics Drives Ecology in Today’s Business Environment Selling Low Impact Development on Economics What Are The Existing Costs? – Opportunity Costs – Real Estate for Detention Systems – Upfront System Costs – Storm Sewer & Water Quality Systems – Long-term Maintenance Costs What Opportunities Exist? – How can we use drainage as an amenity? – How can we increase property values? – How can we create a better sense of place?
  • 29. Cost Distribution Traditional Site Design Vs. Low Impact Development Site Site Furnishings Drainage Furnishings Hardscapes Design Svs Design Svs $$$$$$$ Softscapes Hardscapes Softscapes
  • 30. Queenston Manor Proving the Opportunity LID Affords Developers Typical detention storage 7 residential buildings 7.4 acres
  • 31. Queenston Manor Proving the Opportunity LID Affords Developers LID design spreads drainage throughout site as an amenity Redesign yielded 2 additional buildings 48 more apartment units
  • 32. Queenston Manor Proving the Opportunity LID Affords Developers
  • 33. Lessons Learned The System is Greater Than the Sum of It’s Parts Media Performance is the Critical Component Eliminate Choke Points in the Media Section Match Underdrain to Media Protect the System
  • 34. Media Performance A Better Understanding of Nature Understanding Media Performance Will Improve System Functionality Verifying Performance Will Insure Long Term Functionality
  • 35. Choke Points Fabrics are the Achilles Heel of LID Bridge Media With Aggregate / Do Not Separate Media From Aggregate Require Bridging Analysis in Specifications Engineered Media - 12” – 48” 70% Sand - 25% Organic or Inorganic - >5% Silt / Clay / Fines 3” – 6” Intermediate Layer - Fine Gravel 2mm – 4mm 12” – 60” Drainage Layer - Pea Gravel 1/4” – 3/8”
  • 36. Systems Parts Must Match Performance Underdrain Flow Must Match Media Flow Perforated Pipe Has 2” of Orifice Opening Per Linear Foot For High Flow Soils, Look To Higher Performing Underdrain Systems
  • 37. Protect The System Good Designs Are Compromised if Proper Protection is Neglected Stabilize the Side Slopes ASAP / Do Not Wait For Construction to Commencer Protect the Soils During Construction / An Ounce or Prevention is Worth a Gallon of Cure
  • 38. Installation of Biofiltration System Copper State Rubber
  • 39. Installation of Biofiltration System Copper State Rubber
  • 40. developing LID criteria Adopted April 2011 Only County in TX with LID criteria. Optional, not every project must be LID. YOU MUST HAVE A PRE-PROJECT MEETING
  • 41. developing LID criteria Stakeholder review & public interest County interest Alternative designs, tools, BMPs Storm water management (quantity & quality) EPA Requirements TCEQ MUD re-imbursements Expect criteria to allow for MUD reimbursement for LID projects
  • 42. storm water quality Increased treatment, similar to LEED. Treatment of the 1” Water quality volume. Although not specified, we believe the LID practices will generally result in 80% TSS removal. All LID based projects >1acre receive a SWQ permit.
  • 43. engineered soil media Treat the first 1” of runoff volume Safety factor of 2. actual design capacity of the soil is to be 60”/hr to meet the 30”/hr criteria with safety factor. In situ test (see Appendix B).
  • 44. development considerations Specific considerations for development types: Public Streets Commercial Developments Subdivisions Ownership & Maintenance. Safety cannot be compromised. Safe conveyance of the 100 year event.
  • 45. LID projects We’re gaining experience in LID projects, similar to our LEED experience. Past projects: Evelyn Meador Library, Gene Greene Park Roadways: Birnamwood Dr. – (under construction) N. Main – (in design) A 3rd, (under evaluation).
  • 46. Birnamwood drive – HC Pct 4 East of I-45, North of Cypresswood. Road leads to Pct 4’s John Pundt Park & Spring Creek Greenway. First LID-road project in our region.
  • 47. Birnamwood drive LID roadway section Floodplain mitigation
  • 48. Birnamwood Drive & False inlets. Curb Storm Sewer at outfalls only. 32 ft median. native plants, trees, grasses.
  • 49. Planting plan Engineered Soils
  • 56. Bioswale Engineered Soils April 24 2012
  • 58. Planning considerations Consider the project goal Evaluate project costs Visualize the landscape plan Determine vegetation establishment
  • 59. our first experience Eliminated offsite detention; reduced our floodplain mitigation pond. -Reduced wetland impact. –SWQ treatment. Saved ROW cost. Saved cost of Storm sewer. Reduced mowing to 1-2x/year. Enhanced landscaping, warranty, irrigation. Gained aesthetic benefit (road to Park). Utilized 2 Bid packages (road & landscape). Still evaluating all costs as we move through construction (SWPPP, Extra work items, plants). Next time- evaluate landscaping and seeding, single bid package
  • 60. resources www.houstonlwsforum.org Houston Land/Water Sustainability Forum www.TexasLID.org a centralized, accessible resource for important information and guidelines for effectively implementing Low Impact Development (LID), or Green Infrastructure, practices and policies across Texas. The website is collaborative effort between: Lady Bird Johnson Wildflower Center, Ecosystem Design Group The Center for Research in Water Resources, University of Texas at Austin The Texas Commission on Environmental Quality (TCEQ) www.asla.org Banking on Green: A Look at How Green Infrastructure Can Save Municipalities Money and Provide Economic Benefits Community-wide. Joint report by American Rivers, the Water Environment Federation, and the American Society of Landscape Architects and ECO Northwest – April 2012