DrainPac™ Storm Drain Filter Insert Specs & Regulations

United Storm Water's DrainPacs™ are custom-designed and fabricated from high quality materials to meet individual customer requirements. These multi-layer filtration devices are installed in a manner that does not interfere with lateral line water flow. Two commonly used DrainPac™ configurations treat urban runoff that enters drop inlets and curb inlets. Regardless of the DrainPac™ configuration that is designed and fabricated for your facility, all of United's storm drain filter inserts are made from the same materials as specified below.

Filter Liner

  • 4 oz. non-woven polypropylene
  • PVC mesh with overflow by-pass
  • Rated at 140 gal./min./sq. ft.

Liner Support Basket

  • High density polymer
  • Rated at 850 lb./ft.

Frame Assembly (Drop Inlet)

  • 304 stainless steel, 18-gauge
  • 2 in. lip
  • PVC molding

Frame & Attachment Assembly (Curb Inlet)

  • 304 stainless steel, 12-gauge
  • 45° angle brackets
  • 3/8 in. anchor bolts

Drop Inlet DrainPac™

The drop inlet DrainPac™ is designed for drop inlet type storm drains. They are installed in a self-supported configuration on the lip of the catch basin underneath the traffic grate.

Drop Inlet DrainPac™ Drawing Drop Inlet DrainPac™ Drawing Download (PDF)

Drop Inlet DrainPac™ ready for installation

Drop Inlet DrainPac™ installation

Drop Inlet DrainPac™ installation

Fully installed Drop Inlet DrainPac™

Curb Inlet DrainPac™

The curb inlet DrainPac™ is designed for catch basins. It is mounted on the forward inner wall of curb inlets beneath the curb opening.

Curb Inlet DrainPac™ Drawing Curb Inlet DrainPac™ Drawing Download (PDF)

Curb inlet DrainPac™ installation

Curb inlet DrainPac™ installation

Curb inlet DrainPac™ installation

Fully installed curb inlet DrainPac™