Backflow Prevention Well

A backflow prevention well is a well that contains a check valve (backflow valve).
The valve allows water to flow in only one direction and prevents it from flowing back into the system.

It is used in stormwater, wastewater, LTA/LPS pump stations, and drainage systems.

What Is a Backflow Prevention Well?

A backflow prevention well is a small or medium-sized chamber where a check valve is installed either inside the pipe or on a removable insert.
It stops reverse flow and protects buildings, pumps, and drainage systems.

The well makes it easy to:

  • access the check valve

  • inspect it

  • service it

  • replace it

🟧 Why Are Backflow Prevention Wells Used?

✔ 1. Protection Against Flooding

Prevents water from being pushed back from:

  • municipal stormwater pipes

  • sewer lines

  • drainage systems

Especially important during heavy rain or high water levels.

✔ 2. Protection for LTA/LPS Pump Stations

When a pump stops, you don’t want the wastewater to flow back into the pump station.

✔ 3. Protect Basements from Backflow

During intense rainfall, stormwater or sewage can be pushed back toward the house.
The check valve well stops this.

✔ 4. Prevent Unwanted Cross-Flow Between Systems

Examples:

  • stormwater flowing into drainage systems

  • road gullies pushing water back toward a house

🟩 Where Are Backflow Prevention Wells Used?

✔ Stormwater Systems

Prevents backflow from the municipal stormwater network.

✔ Wastewater Systems

Protects household sewage lines against backpressure from the street.

✔ Drainage Systems

Prevents water from being forced back into foundation drainage.

✔ LTA/LPS Pump Stations

The check valve is a key component of the system—mounted in the pump well or in a separate check valve well.

đŸŸ„ Types of Check Valves Used in Wells

1. Flap Valve

Simple, common in stormwater.

2. Ball Check Valve

Robust option for sewage and LTA systems.

3. Membrane Check Valve

Used where very tight sealing is required.

4. In-Line Check Valve

Mounted directly on the pipe inside the well.

5. Drop-In Check Valve Inserts

Modular design that can be lifted out for maintenance.

⭐ Summary

A backflow prevention well is a well containing a check valve that stops reverse flow in wastewater, drainage, or stormwater systems.
It protects:

  • buildings

  • drainage systems

  • pumps

  • sewage installations

and makes valve servicing easy.