Soakaway blocked or overflowing — causes and fixes
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Most likely cause & what to check
A soakaway is a pit filled with rubble or a plastic crate structure buried in the garden that allows rainwater or surface water to slowly drain into the ground. It will overflow when the surrounding ground is saturated.
First, check if it's just weather-related: after prolonged heavy rain, even a well-functioning soakaway will overflow temporarily. If water drains away within 12–24 hours of dry weather, it is working correctly.
If the soakaway remains waterlogged weeks after heavy rain, the surrounding soil has likely become clogged with fine silt over the years. This is normal degradation — soakaways typically last 10–30 years.
Check that surface runoff from neighbouring land isn't overwhelming your soakaway. If a new drive or extension nearby has increased runoff onto your land, this can overload a previously adequate soakaway.
A blocked access pipe leading to the soakaway can be rodded or jetter-cleared by a drainage contractor. This is often cheaper than replacing the soakaway itself.
Soakaway replacement involves excavating the old pit (typically 2–3m deep and 1–1.5m diameter) and installing new plastic crate systems or rubble fill. Cost varies widely with access and ground conditions.
Planning permission is not required for a soakaway, but building regulations may apply if it's connected to a new drainage scheme. Check with your local authority before installing a new one.
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