Why the ground near rivers can be unstable

High levels of moisture and constant erosion can make grounds near rivers unstable. The soil is often saturated, and the continuous flow of water slowly washes it way, especially after heavy rain or flooding. This constant movement can gradually weaken the supporting soil in your garden or patio.

One thing to note is that ground movement happens slowly. Most homeowners aren’t aware of a problem until severe damage occurs. Even if your garden looks normal, soil erosion may already be affecting the stability of your foundations.

The River Camac incident: a case in point

The garden collapse on Tyrconnell Street wasn’t as simple as a wall falling. The soil gave way first and the wall simply followed its movement, demonstrating that visible structures are typically the last to fail.

This incident isn’t an isolated case. Many riverside properties in Ireland are facing similar risks, even if they’ve been standing for decades. Properties with ageing garden walls or retaining structures that weren’t built to withstand changing climate conditions and water tables are particularly vulnerable.

Warning signs to watch out for

There are several warning signs you can watch out for that might indicate your riverside home is at risk. Knowing these will help prevent major damage:

• Diagonal or stair-step cracks in walls and paving near the riverbank

• Walls leaning or bulging towards the water

• Soft or sinking patches in your lawn or garden

• Gaps opening between walls, patios, or extensions

Noticing the signs can help prevent minor dangers from progressing into a major emergency.

How soil, water and ageing structures interact

Wet soil loses strength over time. This is especially true with clay, gleys and alluvial soils, which are common along Irish rivers. Although these soils are highly fertile, heavy rainfall and poor drainage can cause the soils to become waterlogged and slowly wash away or dry out and shrink during prolonged dry spells.

Aging retaining walls can worsen the risk as deterioration can cause them to bulge or lean forward, reducing active pressure on the soil. Additionally, because Ireland has become warmer and wetter over the years, older walls may not have be built to withstand modern water tables or heavier garden loads.

All these factors combined make the riverside ground more susceptible to movement.

You may want to repair or replace any damaged walls, but unless the ground beneath it becomes stable again, the problem will persist. Ground stabilisation works, whether through improving soil strength or adding additional support will protect the entire property and not just one part of it.

When should you get professional advice?

It’s important to remember that not every riverside property is at risk of ground movement, but if you do notice any of the warning signs, then it’s best to seek professional advice from a geotechnical engineer or qualified contractor. Ground engineering specialists such as Mainmark Ireland can assess the underlying soil conditions and stability of your structures and recommend the best solution to remedy the issue. Engaging with a geotechnical engineer early is typically cheaper, less stressful and can help prevent further damage.

Stability begins under the surface

The River Camac collapse is a reminder that while there are perks to riverside living, there are also hidden risks, which may take years to surface. Understanding more about the ground beneath your home and watching for potential warning signs of movement is essential in protecting your property, as stability begins underground.

If you have any questions or concerns, contact us today.