2013 Session: 565

• Significance of Zinc Levels in Stormwater Runoff from Permeable Friction Course Pavement Overlays
  Abstract: There is increasing use of tire-rubber in hot-mix asphalt and increasing use of permeable friction course (PFC) or open-graded friction courses (OGFC) as pavement surface layers. The addition of tire-rubber to PFC mixtures seems like a win-win because the properties of the asphalt mixture are improved and the disposal of tires into landfills minimized. However, since tire rubber contains zinc compounds and some laboratory tests have shown tires to leach zinc, the inclusion of tire-rubber may result in higher zinc concentrations in stormwater from pavements with substantial tire-rubber content. Water quality data for roadway sites in California reveal a pattern of rubberized hot mix asphalt surface layers having significantly-higher zinc levels compared to pavements without rubber materials. Additionally, water quality measurements taken on a section of highway in Austin revealed significantly higher zinc concentrations in runoff from PFC with crumb rubber compared to PFC without crumb rubber. These findings reveal how choice of pavement materials could affect stormwater quality.
  Authors: Barrett, Michael; Larsen, Katie A.
  Authors: Barrett, Michael; Larsen, Katie A.
  Year: 2013
  Document Type: Paper
  Subject: Environment; Hydraulics and Hydrology; Pavements
  Session: 565
  Paper Number: 13-4721
• Green Infrastructure Design for Pavement Systems Subject to Rainfall-Runoff Loadings
  Abstract: Impervious surfaces alter hydrology while impacting the chemical balances of water resources. While historical issues of flooding are still a concern, chemistry, loads and aesthetics are companion concerns. Recently, Total Maximum Daily Loads have been promulgated. Additionally, Florida has promulgated no net load increases for runoff and pollutants and is facing imminent numeric criteria for nutrients. With recent trends towards low impact development (LID) and green infrastructure, hydrologic restoration, reuse and source control are part of urban retrofit design practice. This project demonstrates that hydrologic and pollutant load can be managed with site re-design providing no net increase for long-term loadings. Specifically, the proposed design retrofits an existing surface parking facility with a series of design elements. A biofiltration area reactor (BAR) is clay-lined for water table and denitrification management. A linear infiltration reactor (LIR) of cementitious permeable pavement provides infiltration/evaporation, filtration and adsorption. Pavement sweeping provides source control. Continuous simulations with climate and site data indicate that re-design can achieve a no load increase. Cost estimates demonstrate that re-design is comparable to conventional construction costs while incorporating Florida-friendly landscape. Additionally, design options yield a lower cost per nutrient load treated compared to conventional Florida Best Management Practices (BMPs).
  Authors: Sansalone, John Joseph
  Authors: Sansalone, John Joseph
  Year: 2013
  Document Type: Paper
  Subject: Environment; Hydraulics and Hydrology; Pavements
  Session: 565
  Paper Number: 13-4359
  Practice-Ready: Yes
• Ditch Check Installation Evaluations of Wheat Straw Wattles Used for Velocity Reduction
  Abstract:

  Linear construction typically uses drainage conveyances, such as roadside ditches, to convey stormwater runoff away from construction sites to neighboring water bodies. These may be unstabilized and highly susceptible to erosive shear stresses in high velocity runoff. Therefore, best management practices, such as wattle ditch checks, are used to help reduce channel erosion caused by high velocity flow while propagating sediment deposition within the channel. However, with new technology emerging and limited scientific evaluation available on the in-field performance of wattles, it is difficult to know how effective an installation will be for maximizing runoff control performance. Using the Auburn University Erosion and Sediment Control Testing Facility we have investigated wattle ditch check installation practice performance to help the Alabama Department of Transportation (ALDOT) better maximize wattle ditch check performance. This study concluded that ALDOT’s current installation of only staking a wattle to an unstabilized channel can be improved with the addition of a filter fabric underlay to protect the channel bottom at the installation area from scour and using sod staples in addition to staking to secure the wattle in place while increasing ground contact and reducing undercutting.

  Authors: Donald, Wesley; Zech, Wesley Charles; Fang, Xing; LaMondia, Jeffrey J.
  Authors: Donald, Wesley; Zech, Wesley Charles; Fang, Xing; LaMondia, Jeffrey J.
  Year: 2013
  Document Type: Paper
  Subject: Environment; Hydraulics and Hydrology; Pavements
  Session: 565
  Paper Number: 13-3268
  Practice-Ready: Yes
• Ditch Check Installation Evaluations of Wheat Straw Wattles Used for Velocity Reduction
  Authors: Donald, Wesley
  Authors: Donald, Wesley
  Year: 2013
  Document Type: Presentation
  Subject: Environment; Hydraulics and Hydrology; Pavements
  Session: 565
  Paper Number: 13-3268
• Green Infrastructure Design for Pavement Systems Subject to Rainfall-Runoff Loadings
  Authors: Sansalone, John
  Authors: Sansalone, John
  Year: 2013
  Document Type: Presentation
  Subject: Environment; Hydraulics and Hydrology; Pavements
  Session: 565
  Paper Number: 13-4359
• Significance of Zinc Levels in Stormwater Runoff from Permeable Friction Course Pavement Overlays
  Authors: Larsen, Katie
  Authors: Larsen, Katie
  Year: 2013
  Document Type: Presentation
  Subject: Environment; Hydraulics and Hydrology; Pavements
  Session: 565
  Paper Number: 13-4721