Making LID Practical with Standard Details Lesley Brooks, P.E., CFM, ENV SP Boris Minot, EIT Spring TFMA-2016, Houston, TX Low Impact Development Match Existing Hydrology

Reduce time of Conservation of concentration natural features Low impact design = Reduction in impervious area Reduce volume of runoff Developing Details

• Dallas contracted Freese and Nichols and Hayden Consultants to develop up to 8 typical details for green roadway design Why Water Quality on Streets?

• Roads and sidewalks = 33% of the total Sources of Constituent Source ParticulatesSourcesPavement of wear, Pollution vehicles, the atmosphere, and maintenance activities Petroleum Spills, leaks, antifreeze, and hydraulic fluids, and asphalt surface leachate Nitrogen Atmosphere and fertilizer application Phosphorus Atmosphere and fertilizer application Copper Metal plating, bearing and brushing wear, moving engine parts, brake lining wear, fungicides, and insecticides Iron Auto body rust, steel highway structures such as bridges and guardrails, and moving engine parts Lead Leaded gasoline from auto exhausts (previously) and tire wear Zinc Tire wear, motor oil, and grease Cadmium Tire wear and insecticides Metal plating, moving engine parts, and brake lining wear Nickel Diesel fuel, gasoline, lubricating oil, metal plating, brushing wear, brake lining wear, and asphalt paving Manganese Moving engine parts

Cyanide Anti-caking compounds in deicing salt Sodium, Calcium, Deicing salts and Chloride Sulphates Roadway beds, fuels, and deicing salts Why Water Quality on Streets?

• Public Property/Public Examples

• Part of walkable/ sustainable community Additional Benefits of LID

• Reduced construction costs – Case Studies Analyzing the Economic Benefits of Low Impact Development and Programs (EPA, 2013) – Reducing Costs through Low Impact Development Strategies and Practices (EPA, 2007) • Increased property values – A 2008 study in Seattle found neighborhoods with LID practices increased property values by 3.5-5% (The Effect of LOD on Property Values, Water Environment Federation) 2006 and 2012 Bond Program • $260 Million for Street and Transportation Improvements • Consultants judged on experience in green infrastructure (iSWM and/or Envision) • Expectation that roadways would be designed and built as complete streets Riverfront Blvd, Dallas

$42.5 Million Riverfront Blvd, Dallas S. Lamar Street, Dallas S. Lamar Street, Dallas Lower Greenville, Dallas Lower Greenville, Dallas Elm Street, Dallas Elm Street, Dallas Elm Street, Dallas Creating Standard Details Looking to Others for Guidance

• New York • Seattle • Portland • Philadelphia • San Francisco • Milwaukee • Washington D.C./DDOT • EPA Outreach

Streets Department Sustainable Maintenance Development Department

Trinity Public Works Watershed

Urban Stakeholder Landscape Planning Input Architects Options • High pollutant removal rates 85% 60%/50% Nutrients (Total Phosphorus/Total Nitrogen) 35%-80% Metals (Cadmium, Copper, Lead, and Zinc 90% Bacteria 80% Hydrocarbons • Lower costs than other options = 7.30 ∗ . or $6.80/cubic foot Where C = Construction, design and Permitting Cost ($) V = Volume of water treated (cubic feet)

Brown and Schueler. 1997. The Economics of Stormwater BMPs in the Mid-Atlantic Region • Several options for integrating into design Dallas Considerations

• Low soils Dallas Considerations

• High intensity storm events

www.floodsafety .com Dallas Considerations

• Standard Maintenance Protocols • Contracted Maintenance BioretentionEnhanced/VegetatedCurbTree BoxExtension Filter Planter -With-CornerBioswale Parking -SingleSwale -Without-Mid-block-In Series Parking Bioretention Planter -With Parking -Without Parking Curb Extension -Corner -Mid-block Enhanced/Vegetated -Single -In Series Bioretention Planters Bioretention Planters Bioretention Planters Curb Extensions Curb Extensions Curb Extensions Bioswales Bioswales Enhanced/Vegetated Channels Enhanced/Vegetated Channels Enhanced/Vegetated Channels Tree Box Filter Tree Box Filter Tree Box Filter Design Components

Trench Drain Plants & Shrubs Edge Treatments

Cleanout Overflow Structure

Underdrain Energy Dissipators Signage Storage Media Maintenance and Inspections Upcoming Training End Goals

• Improved water quality • Economic development • Walkable communities with character • A well maintained system Questions?

Boris Minot, EIT [email protected] 2711 N. Haskell Blvd, 33 rd Floor 214-217-2228 Dallas, TX Lesley Brooks, P.E., CFM, ENV SP [email protected] 214-217-2248