Fast-flowing water from the catchment above has cut a channel in the area below the Jorgensen Park carpark, destabilising the soil surface and walking tracks.
The volunteers are helping Shire of Kalamunda staff by working on part of a 2.7km walking trail.
Shire chief executive Rhonda Hardy said Jorgensen Park was one of the Shire’s oldest and best-loved public parks.
“Preserving its 65 acres of semi-bushland is a high priority,” Ms Hardy said.
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READ NOW“It’s one of the Shire’s many dog-friendly reserves and is popular with nature lovers and bushwalkers.
“The Jorgensen Park Drain Restoration Project, including planting, will see a reduction in soil erosion along the drain, directly benefiting the Piesse Brook Catchment.
“A new path is also being constructed along the drainage line which will improve access to the area and help to direct any additional surface water back into the drainage line.”