Debris in stormwater pump stations can be a big issue

Debris in stormwater pump stations is common issue that can cause submersible pumps to fail. Leaves or bark from local fauna, loose gravel from garden beds or chip packets can potentially enter the chamber.

Stormwater pumps have a ‘free passage’ which is the size of solids that can pass through the impeller. This varies with the size of the pump. If solids larger than this allowance are sucked through the pump, it can foul the impeller and cause the pump to jam. This is a common cause of pumps malfunctioning, so examining the impeller for any debris is one of the first steps you can take to help identify your problem.

How do I stop jams from occurring in stormwater pumps?

Upstream Protection devices:

More practically, devices that help prevent debris from entering the pump chamber can be advantageous.  To help with this we have a few suggestions:

Grease Pollutant Trap:

A GPT is a grated inlet pit that has a trash basket fitted to capture debris prior to flushing further into the system. These are easier to clean out for maintenance as you are not required to clear trash from the bottom of the GIP or pump station. 

EcoTreat™ Silt Trap

A non-corrosive, impact resistant polyethylene basket with significant silt handling capacity, yet light weight enough to enable emptying by hand. A silt trap is a design function in a standard grated inlet pit or junction box. This traps a ‘wet zone’ in the bottom of the chamber, which also accumulates silt and heavier debris such as gravel.  These will need to be cleaned out from time to time.

Regular Maintenance:

Any pump station should have scheduled preventative maintenance that is upheld to ensure smooth running operation.  Keep in mind that pump stations are a combination of electrical equipment and sensors, and mechanical components, most of which are then submerged under water and expected to continue functioning hassle free.

To keep your pump station in good shape, it’s worth having someone check on its condition at regular intervals to check for early signs of damage/wear.  It can be a good opportunity to clear any build-up of debris in the chamber as well before it causes damage to the pumps. 

If you need advice on this, or a service provider to assist with regular maintenance on your stormwater pump station, get in touch with a Pump Stations team member for assistance.