Enhanced Roadside Trench System for Effective Management of Salt Laden Runoff in Salt Vulnerable Areas

Road salt application in cold-climate regions during winter months is essential for maintaining traffic safety. However, runoff from salt-induced snow and ice melt poses significant adverse environmental effects, particularly in salt-vulnerable areas. This study introduces a cost-effective solution for mitigating the adverse environmental impacts associated with road salt application within salt-vulnerable areas called the Enhanced Roadside Trench System (ERTS) – located under the shoulder of the highway. This study presents the design steps for sizing ERTS via a case study for Highway 412 and evaluates its performance using a calibrated stormwater management model (PCSWMM). The modular design accommodates different highways with varying lane numbers and longitudinal slopes. This research highlights the ERTS as a cost-effective, sustainable solution for managing winter highway runoff, offering better performance in protecting surface and ground water resources while maintaining road safety.