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Finalist 07187 - Green Roadway

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Finalist Event presentation from AECOM team (Ross Gordon and Russell Bynum speaking).

  • I want to applaud the approach taken here to manage stormwater, it appears both cost effective and sustainable. I heard no mention of paving material type and was wondering if light colored high albedo pavements were required, since heat island effects of paving are also a serious issue in Houston's warm climate.
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Finalist 07187 - Green Roadway

  1. 1. Higher Performance - Lower Cost<br /><ul><li>13% reduction in construction cost per mile
  2. 2. Approx. 70% reduction in peak discharge
  3. 3. Aesthetically attractive and functional landscapes</li></ul>DESIGN OVERVIEW<br />
  4. 4. Standard Roadway<br />Green Roadway<br />ROADWAY DESIGN<br />
  5. 5. LANDSCAPING<br />
  6. 6. Fraxinus pennsylvanica <br />Conoclinium<br />coelestinum<br />Hibiscus aculeatus<br />Tripsacum dactyloides<br />Phlox divaricata<br />Wedelia texana<br />Chasmanthium latifolium<br />Sorghastrum nutans<br />Taxodium distichum<br />Lobelia cardinalis<br />Wedelia texana <br />Panicum virgatum<br />Andropogon virginicus<br />LANDSCAPING – NATIVE PLANTS<br />
  7. 7. LANDSCAPING – DRY CREEK BEDS <br />
  8. 8. Cercis canadensis var texensis - Texas Redbud<br />Cyrilla racemiflora - Leatherwood<br />Wedelia texana <br />LANDSCAPING – ORNAMENTAL MASSING<br />
  9. 9. Tripsacum dactyloides<br />LANDSCAPING – BIOSWALES<br />
  10. 10. Basic Design<br /><ul><li>Linear detention concept utilizing restrictors at cross-over culverts
  11. 11. Maximize detention storage in the ROW
  12. 12. Vegetated bioswales reduce flow velocities and filter storm water</li></ul>100 yr Green WSE Profile<br />Methodology<br /><ul><li>Dynamic hydrology and hydraulics using HEC-HMS and EPA-SWMM
  13. 13. No additional or enhanced infiltration assumed or adjusted CN
  14. 14. Benefits are due to hydraulic attenuation of runoff through the bioswales / linear detention</li></ul>STORM WATER STRATEGY<br />
  15. 15. 100 Yr. flood is contained inside the median with no roadway flooding<br />STORM WATER BENEFITS<br />
  16. 16. Shows significant reductions in highway runoff pollutants<br /><ul><li>Predicted 84% TSS removal
  17. 17. Predicted 68% metals removal
  18. 18. Predicted 30% pathogen removal</li></ul>FIRST FLUSH<br />Ability to treat first 1” of storm water runoff <br />WATER QUALITY BENEFITS<br />
  19. 19. Optional underground cisterns located in rain harvesting areas to support ornamental plantings<br />Solar powered drip irrigation system (1 GPM up to 50 PSI)<br />$12,000 per station <br />SOLAR POWERED DRIP IRRIGATION<br />
  20. 20. BIO-HARVESTING IN THE ROW<br />
  21. 21. 13% Reduction in Construction Cost<br />Standard / Mile:<br />$4.97 Million<br />Green / Mile:<br />$4.32 Million<br />9% Reduction in Maintenance Cost<br />Cost estimates prepared for both scenarios, with identical unit costs, to facilitate honest cost comparison<br />COST OVERVIEW<br />
  22. 22. A NEW SUSTAINABLE STANDARD<br />

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