DRAINAGE DESIGN CASE STUDY:

As part of the Tobay Beach Marina bulkhead improvement project, the Town of Oyster Bay Public Works upgraded the site’s waterfront drainage system using JET Filter maintainable weep hole assemblies. The focus was to extend drainage through fiber reinforced polymer (FRP) barriers and improve long-term water relief performance along the marina’s bulkhead walls.

Located in a high-moisture, saltwater marine environment, Tobay Beach’s existing bulkhead infrastructure required modern drainage solutions to combat:

• Hydrostatic pressure buildup

• Water entrapment behind new FRP bulkhead walls

• Soil erosion and embankment degradation

To address these challenges, engineers from D&B Engineers and Architects specified the use of maintainable weep holes to relieve pressure, manage runoff, and extend the structure’s lifespan.

Under the leadership of Galvin Bros., Inc., the team installed a large-volume drainage solution utilizing:

✅ 175 JF2.5ABS Maintainable Weep Hole Assemblies

✅ 2.5” open-end ABS Housing

✅ Geotextile Filter Media: Mirafi® Filter-Weave FW 300

✅ Integrated through fiber reinforced polymer barriers

The system was installed as directed by the engineer in the field at specific drainage zones along the bulkhead face to allow water release and soil retention in a harsh marine setting.

Bulkhead walls in marine environments experience:

• High water table fluctuations

• Tidal pressure changes

• Saltwater infiltration

• Accelerated material wear without proper water management

JET Filter’s maintainable drainage assemblies provide a corrosion-resistant, clog-resistant, and serviceable solution to maintain safe, long-term function behind marine bulkhead walls.