APWA Complete Streets and Technology Conference

1. APWA Complete Streets and Technology Conference April 10, 2019 Presented by: James Cramsie, P.E., QSD/P Use of Porous/Permeable Pavements as a Green Street Treatment

2. Green Streets Green Streets achieve multiple benefits, such as improved water quality and more livable communities, through the integration of stormwater treatment techniques which use natural processes and landscaping. (Source: EPA)

3. What are Typical Elements of a Green Street? Protection of the environment (Stormwater Management) Minimize stormwater impacts on the surrounding area through a natural system approach that incorporates a variety of water quality, energy-efficiency, and other environmental best practices Integrate green stormwater management features to increase infiltration and/or filtration of runoff, reduce flows, and enhance watershed health Reduce the amount of water that is piped and discharged directly to streams and rivers Make the best use of the street tree canopy for stormwater interception, as well as temperature mitigation and air quality improvement Mitigate or prevent localized flooding • Health and Prosperity (Improve Community) • Encourage pedestrian and/or bicycle access • Improve the aesthetics of a community • Increases a community’s livability

4. Elements of Stormwater Management Street Trees/Landscaping

5. Elements of Stormwater Management Bioretention/Biofiltration Areas

6. Elements of Stormwater Management Porous/Permeable Pavements 

7. What is Porous or Permeable Pavement? Permeable: Have connected spaces that allow water to percolate through the surface. Porous: Have spaces to allow water in, but are not necessarily connected and therefore do not always allow for percolation through the surface.

8. Types of Permeable Pavements (OPEN GRADE FRICTION COURSE) (ASPHALT TREATED PERMEABLE BASE) Pervious Asphalt Pavement (PAP)

9. Types of Permeable Pavements Pervious Concrete Pavement (PCP)

10. Types of Permeable Pavements Permeable Interlocking Concrete Pavement (PICP)

11. Classifications of Roadways Major Arterials Secondary Arterials Collector Streets (Ex. Industrial areas) Local Streets (Ex. Residential areas)

12. Subgrade consisting of impermeable soils (such as clayey soils) Ongoing maintenance to avoid clogging Initial costs are higher then conventional, but may be offset by reduced stormwater infrastructure costs Sloped pavements require extra design considerations Challenges of using Permeable Pavement Not recommended for high speed roadways (such as arterials) or heavy loaded roadway (such as industrial areas)

13. Reduction in contamination of water runoff and sediment loading Recharging of groundwater supplies Improves wet-weather visibility, tire spray and hydroplaning Absorption of noise from tires and engines Reduces stormwater runoff volume Benefits of using Permeable Pavement

14. Opportunities to use Permeable Pavement Parking lanes, Street Parking areas or Bike Lanes

15. Opportunities to use Permeable Pavement Within intersections controlled by 4-way stops

16. Opportunities to use Permeable Pavement Alley Ways City of Los Angeles Avalon Green Alley City of Santa Monica 1500 17th Court

17. Opportunities to use Permeable Pavement Curb and Gutters City of Glendora Pervious Concrete Gutter Pilot Project (2015)

18. Caltrans: Porous Pavement Design Guidance, August 2014 CASQA: Technical Memo #2-Permeable Pavement Details and Standard Review, May 2017 FHWA: Tech Brief-Porous Asphalt Pavement with Stone Reservoirs, April 2015 City of Los Angeles: Series 480 Standard Plans (Green Streets Standard Plans) Available Guidance Documents

19. Thank You! Q & A