Evaluating Barrier Inlet Screens to Mitigate Debris Blockages on Ohio Storm Sewers Using Physical Models and Real Time Monitoring

Abstract Submission: Debris and trash, ranging from fine sediment to hubcaps, tires, and other litter, on can disrupt the hydraulic capacity of roadside sewer systems. Excessive debris accumulation can block drainage inlets, resulting in prolonged ponding of stormwater during storm events which poses serious risks to passing motorists. Barrier inlets, unobstructed drainage openings (approximately 4-in tall and 10-ft long) in median walls of divided highways, are particularly susceptible to debris blockages given their minimal separation from the travel lane and unique geometry, which can result in obstruct hundreds of linear feet of sewer line and require numerous hours to alleviate. This presentation will highlight research evaluating the ability of proprietary and purpose-built screening devices designed to prevent debris from entering barrier inlet openings via a combination of physical models and real time monitoring of field installations. A 12-ft wide by 50-ft long test channel was developed by the Iowa Institute of Hydraulic Research to study the hydraulic and debris capture efficiency of barrier inlet screens in a combination of roadway conditions. Remote sensing technology was installed to monitor debris accumulation and composition, ponding depth, and spread in real time at research sites along interstate highways near Cleveland, Columbus, and Cincinnati. Results indicated that while all screens were effective at mitigating debris intrusion, the purpose-built fabricated screens were easier to install and required less maintenance compared to proprietary screens. Findings from this study may be applicable to highway managers in other jurisdictions seeking to mitigate debris blockages in roadside sewer systems.

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