NDS Flo-Well FWAS24 50 Gal Dry Well Kit — Black, 3 Side Panels + Top Cover, Gravel-Free Stormwater Detention

The NDS Flo-Well FWAS24 50 gallon dry well kit is an underground, gravel-free detention system designed to collect, temporarily store, and slowly infiltrate excess yard and roof runoff.

Designed for residential and light commercial stormwater management, the Flo-Well FWAS24 reduces standing water by channeling runoff into a buried tank that releases water to surrounding soil through an open bottom and selectable side weep points. The kit ships with three interlocking side panels and a top cover with pipe knockouts so you can connect standard 4" sewer and drain or Sch 40 piping. Because its interior is largely hollow, the Flo-Well provides more detention volume than traditional gravel-filled dry wells while requiring far less excavation material and no heavy stone backfill.

How does the Flo-Well capture and release runoff?

The unit accepts incoming flow through knockouts in the top cover and in the side panels, directing water into the tank. Water is temporarily detained inside, then seeps out through the open bottom and optional punched weep holes to infiltrate the native soil below and around the unit.

• Top-cover knockout fits 4" S&D pipe for direct connection from channel drains or catch basins
• Twelve side-panel knockouts let you place connections at the optimal elevation
• Open bottom design accelerates infiltration into surrounding gravel or native soil
• Gravel required only as a base layer to prevent scouring—no heavy stone fill needed

What are the installation options and load capacities?

Flo-Well is engineered for flexible placement: it can be buried, stacked, or combined with other units to match site detention needs. The kit supports pedestrian loads and light equipment like lawn tractors when installed per guidelines; multiple units can be stacked up to four high or placed side-by-side for larger capacity.

• Can be buried or stacked up to 8 ft deep when properly supported
• Supports pedestrian traffic and lawn tractors when installed correctly
• Units can be stacked four high or spaced 18" apart side-by-side for modular capacity
• Bottom panel sold separately if a sump-pump base or enclosed bottom is required

How does this differ from a traditional gravel dry well?

Traditional dry wells rely on a deep excavation packed with heavy stone to create void space for water detention. The Flo-Well’s molded tank provides the same or greater storage capacity without filling an entire hole with gravel, making installation faster and reducing the need for heavy aggregates and machinery.

• Provides roughly 250% more detention volume than comparable gravel-filled wells
• Only a small gravel layer is needed at the base to prevent scouring
• Easier and quicker to install—less excavation and material handling
• Compatible with rain gardens, bioswales, and integrated stormwater systems

What components are included and what else might I need?

The supplied kit contains three side panels and a top cover in black, shipped unassembled for on-site assembly. Remaining components—such as a bottom panel, extra units for stacking, pipe fittings, and base gravel—may be added depending on site requirements and desired performance.

• Included: three side panels plus top cover with knockouts (unassembled)
• Optional: bottom panel (sold separately) for sump pump base or sealed installations
• Plumbing: 4" S&D or Sch 40 pipe connections via knockouts
• Site prep: small gravel base recommended to prevent scouring under the open bottom

Who this is for: homeowners, landscape contractors, and site managers looking to manage localized runoff without hauling heavy stone can benefit from the NDS Flo-Well FWAS24. It suits yards, driveways, playgrounds, golf-course turf, rain gardens, and other areas where space-efficient detention and infiltration are needed. For properties with local stormwater detention or infiltration requirements, the Flo-Well provides a modular, gravel-sparing alternative that integrates into broader drainage solutions.