DRAINAGE DESIGN CASE STUDY:

The New York City Department of Design and Construction (NYC DDC) upgraded the drainage system behind concrete retaining walls along Huguenot Avenue and Swaim Avenue in Staten Island to reduce hydrostatic pressure and protect critical infrastructure. The new system includes JET Filter maintainable weep holes, helping extend the lifespan of the wall structure and reduce long-term maintenance

Urban sites like Staten Island are especially vulnerable to:

• Water buildup behind retaining walls

• Freeze-thaw damage in colder months

• Soil erosion and foundation weakening

• Structural wall failure without adequate water relief

The NYC DDC project prioritized low-maintenance, long-lasting drainage solutions for long-term reliability in a space-limited city setting.

Working with Inter Contracting Corp., the team installed:

✅4” ASTM 316/316L Stainless Steel Housing

✅Geotextile Media: Mirafi® Filter-Weave FW 300

✅Strategically installed through concrete barriers for maximum efficiency

These components support long-term hydrostatic pressure relief, protect surrounding structures, and are easily accessible for cleaning and inspection—critical in high-density environments.