Ohio LTAP Center / Ohio Depart


Wednesday, October 11, 2017
10 a.m. - 11:30 a.m. EDT

CM | 1.50

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         Traversing Stormwater Treatment Technologies - Which do I choose?

         Stormwater management regulations are continuing to evolve and become more complex, particularly in regards to

         addressing water quality. Regulations are becoming more intricate not only at state levels, but even at municipal levels

         and often vary from one municipality to the next. When the designer begins exploring options to meet water quality

         regulations, they begin seeing terms like hydrodynamic separation, biofiltration, runoff reduction, rainwater harvesting

         and filtration. What do each of these mean? How do you know which technology is the most appropriate to meet the

         local regulation? Will it achieve 80% TSS removal? Which is most economically feasible? Without understanding the

         various types of treatment technologies available, it can be confusing and time-consuming in determining which

         alternative is best for your site. This presentation will review the meaning behind each type of treatment technology

         alternative generally evaluated when traditional green infrastructure BMPs can't be implemented. It will help the

         audience understand industry terms such as 80% TSS removal...several factors make up this industry-standard term

         such as particle size, flow rate and concentration. The audience will understand if basic forms of treatment are

         acceptable such as hydrodynamic separation, or if a more advanced form of treatment is required, such as filtration. The

         goal of the presentation will be to help regulators and designers alike understand the importance of differentiating

         between technology types, as well as design and long term O&M considerations for each.

         Pervious Pavement Use for Cost Effective Drainage Solutions

         Hague Avenue from Broad Street to Sullivant Avenue on the City of Columbus' west side was in desperate need of

         rehabilitation. CMT worked closely with the City to implement user-based design improvements, such as curb

         extensions, which calm traffic, help protect parked vehicles, and increase safety for motorists, pedestrians and bicyclists.

         Once the proposed design for the user-based improvements was complete, CMT tackled the bigger issue: stormwater.

         We reviewed the existing storm sewer infrastructure - most of which was constructed in 1913 - and the existing

         topography to determine that adequate improvements could not be accomplished due to the existing lack of inlets, the

         depth of the main sewer line, and the overall flatness of the roadway. With these limitations, CMT used the proposed

         roadway layout to implement a solution that had never been constructed in the city before - porous asphalt pavement

         within the protected parking areas. When the analysis was complete, CMT determined that the porous asphalt design

         would offset the lack of drainage, improve water quality, and promote infiltration back into the groundwater system. It

         could also be constructed at a cost savings when compared to installing a new storm sewer main. The presentation will

         provide an overview of the project, site conditions, and initial drainage considerations. The presentation will also discuss

         design issues specific to Hague Avenue, how this solution can be implemented on future projects, potential project cost

         savings, and environmental benefits.

         Using Permeable Interlocking Concrete Pavement as a Control

         Retrofitting impervious roadways with materials designed to infiltrate stormwater is a viable green infrastructure solution

         for stormwater management. The use of permeable interlocking concrete pavement (PICP) in parking lots and

         driveways is well established as an effective way to reduce runoff and provide stormwater detention and pollutant

         control benefits. Many municipalities now recognize that roadways can be designed to handle vehicular traffic and also

         function as a stormwater control measure. Parts of Atlanta have struggled with recent flooding problems due to

         stormwater runoff from impervious areas. Heavy rains have sent runoff and raw sewage from combined sewer overflow

         into homes and backyards forcing the city to address reoccurring flood events. Beginning in 2015, several roadways

         were retrofitted with PICP as part of a green infrastructure program designed to reduce flooding, remove polluted runoff,

         and reduce flow to an antiquated combined sewer system. Atlanta has completed the largest PICP roadway retrofit

         project in North America to date. Four miles of permeable paver roadways provide approximately four million gallons of

         water storage capacity in the aggregate reservoirs beneath the road surface. Greater acceptance of PICP for roadway

         applications by pavement design professionals is due in part to research completed by the University of California

         Pavement Research Center in 2014. This research validated design assumptions based on accelerated load testing to

         determine the effective shear capacity of each layer within a PICP in various saturated conditions. This presentation will

         also provide an update on the Southeast Atlanta Green Infrastructure Project, highlighting how Atlanta converted

         impervious roadways to PICP. Lessons learned related to utilities, roadway slopes, and maintenance will be reviewed

         along with an update on the latest industry guidelines for PICP roadway design.


Kevin Earley

Invited Speaker

Market Manager, North-Central Region, Oldcastle Architectural, Inc. Read More

Samantha Brown

Invited Speaker

Region Regulatory Manager - Stormwater, Contech Engineered Solutions Read More

Josh Lockhart

Invited Speaker

Professional Engineer, Project Manager at Crawford, Murphy & Tilly, Inc. Read More

Contact Info

Jerry Garrison, Jerry.Garrison@dot.ohio.gov