Sediment Trap Well

A Sediment Trap Well is a small well designed to capture sediment, sand, soil, and other heavy particles before the water continues into a drainage or stormwater system.

It functions like a mini sediment trap, protecting pipes, pumps, and infiltration systems.

đŸŸ© What Is a Sediment Trap Well?

A sediment trap well contains a sump at the bottom where heavier particles settle.
This allows only the cleaner water to continue to the next part of the system, such as:

  • stormwater pipes
  • drainage pipes
  • infiltration systems
  • pump chambers
  • soakaways / rock pits
  • stormwater tanks or modules

The sediment remains in the bottom of the well and must be cleaned out periodically.

Why Are Sediment Trap Wells Used?

They are used to:

✔ 1. Protect infiltration systems and soakaways

Sediment and sand can clog infiltration beds very quickly.
A sediment trap prevents this.

✔ 2. Protect pumps

In LTA/LPS and drainage pump stations, sand and gravel can damage the pump.

✔ 3. Prevent clogging in pipes

Especially where drainage or stormwater contains a lot of particles.

✔ 4. Capture material from roofs, drains, or ground surfaces

Leaves, sand, soil, and debris are stopped before reaching the pipe network.

Where Are Sediment Trap Wells Used?

Common locations:

✔ Stormwater systems

– between downpipes and soakaways or stormwater networks

✔ Drainage systems

– to capture soil and gravel from drainage pipes

✔ On-site wastewater systems

– before infiltration or soil treatment beds

✔ Pump chambers

– to protect sewage or drainage pumps

✔ Industrial areas & yards

– where surfaces release a lot of sand and debris

How Is a Sediment Trap Well Constructed?

A typical unit contains:

  • Well chamber (plastic or concrete)
  • Sediment/sand trap (sump) at the bottom
  • Inlet and outlet pipes with correct height difference
  • Tight cover (A15 or B125 depending on placement)
  • Cleaning access from the top

Size is usually 200–600 mm in diameter.