Case Study Details

To improve water management and extend the life of reinforced concrete barriers at the Oregon Expressway underpass, Caltrain installed a maintainable drainage system. The primary challenge was to address water accumulation, hydrostatic pressure, and potential soil migration in a busy transportation corridor. The solution involved installing 15 weep hole assemblies at designated points along the underpass to release trapped water, minimize erosion, and allow for long-term maintenance access.

Products Used

• 15 units of JET Filter – JF4SS: 4″ Diameter Open End Maintainable Weep Hole Filter, featuring ASTM 316/316L Stainless Steel Housing and Mirafi® Filter-Weave FW 300 Geotextile Filter Media.

Solutions

This project provides a proactive solution for drainage inspections and the long-term protection of public infrastructure. It helps prevent costly reactive maintenance that could result from water damage, wall cracking, and shifting.