Tackling Water Ingress Challenges in Shellharbour
A homeowner in Shellharbour encountered a growing problem with water ingress. Water from two neighbouring properties, elevated above the yard, began to flow into the property and seep beneath the foundation. This intrusion caused damage to the flooring, led to rising damp, and encouraged mould growth within the home, jeopardising recent renovations.

What Signs Indicate Sources of Water Intrusion?
The issue arose from both surface runoff and subsurface water originating from the back and side yards of adjacent properties. Without an adequate drainage system to intercept this influx, the water had no choice but to flow underneath the house.
Establishing an Effective Drainage System
CS Plumbing designed and implemented a gravity-fed French drain system to capture and redirect water before it could reach the foundation of the home.
The project encompassed several crucial elements:
- A French drain system specifically designed to collect both surface and subsurface water from neighbouring properties, guiding it through gravity to a concrete pit.
- A 100mm PVC pipe extending from the pit to the curb, featuring strategically drilled holes to ensure optimal water discharge.
- Three new, larger-diameter Colorbond metal downpipes that replaced the original smaller versions, linked to new 100mm PVC piping directed towards the curb.
- A sturdy retaining wall system constructed along the boundary, using concrete sleepers and galvanised steel posts, with auger holes drilled by an excavator to create a solid barrier that holds back the adjacent yard.
- Efficient on-site soil removal was carried out using a dumper to enhance project management.
How Can You Guarantee Effective Water Management?
The newly implemented drainage system effectively captures surface and subsurface water at the property boundary, ensuring it is redirected away from the home. The homeowner now enjoys a durable, low-maintenance solution that protects their foundation, flooring, and investment in renovations.
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References:
French Drain Solutions for Runoff Management in Shellharbour



