SuDS Enviro Water Management
Catchpit/SILT TRAP
A Catchpit, or Silt Trap, as they are also known is an empty chamber designed to collect silt and other debris before it enters any drainage system. They play a vital role in preventing the build-up of material that can cause pipe blockages, resulting in backing up of water in the drainage system, which can lead to localised flooding.
How do catchpits/silt traps work?
Catch pits have a pipe inlet that is always raised above the floor of the pit. Often, but not always, the outlet pipe is lower than the inlet pipe. As the water flows into the catch pit, silt and debris falls to the bottom of the catch pit. The main chamber of the catch pit, where the debris collects, is known as the catch pit sump. The water then flows out of the catch pit through an outlet pipe. The outlet pipe can be fitted with a baffle that acts as a secondary filter to prevent floating debris from entering the outlet pipe. Catch pits can also be fitted with a grill/grate through which the water drops to catch large debris items before they can fall into the pit.
Where are catchpits/silt traps needed?
They’re designed to go in front of cellular/crate – attenuation systems that have a smaller capacity.
All models can be supplied in the following depths:
- 1m
- 1.5m
- 2m
- 2.5m
- 3m
Maximum installation depths:
⦁ Adoptable – 2000mm to pipe soffit
⦁ Non-Adoptable – 3000mm Total Depth
Compliance
- Design & Construction Guidance (DCG) – Section C7.1.1 Sediment Management
- Sewers for Adoption (SfA7) 7th Edition
- EN13598-1
- N13598-2 Part 2
- Building Regulations – Part H1
Range
Here at Suds Enviro we offer the ‘Rhino Pit’ in the following diameters supplied as a single pre-assembled unit ready for installation.
⦁ 450mm
⦁ 600mm
⦁ 750mm
⦁ 1050mm
CATCHPIT/SILT TRAP
SuDS Enviro Catchpit Range