What’s the Maximum Water Depth the NOAQ Boxwall Can Handle?

If you’re considering flood protection for your property or business, one of the most important questions you’ll likely ask is: how much water can this product actually hold back?

It’s a valid question, and the short answer? The NOAQ Boxwall is designed to handle floodwater up to 50 cm deep. But let’s take a moment to unpack what that actually means for your level of flood protection – and why it matters.

Fifty centimetres, in flood terms, is a serious depth. According to the Environment Agency’s most recent national flood risk assessment, nearly half of all high-risk properties in England are at risk of flooding to depths of 30 cm or more from rivers or the sea. Even surface water flooding can bring 30+ cm of water to around 17% of high-risk properties.

To put that into perspective: just 30 cm of moving water is enough to float a small car. So, a barrier like the NOAQ Boxwall that can hold back up to 50 cm is capable of protecting against a large proportion of real-world flooding scenarios, particularly in built-up or hard-surfaced environments.

What Makes the NOAQ Boxwall Unique?

The Boxwall is self-anchoring, which means it uses the pressure of the floodwater itself to weigh it down. No digging, bolting or sandbags required. It’s modular and stackable, and two people can deploy up to 200 metres of barrier in about an hour—making it ideal for fast-moving situations or urban environments where every second counts.

It’s particularly suited to smooth, flat surfaces like pavements or tarmac but is also versatile enough for softer ground like grass.

Is 50 cm Enough for Your Flood Risk?

For many residential and commercial properties, 50 cm of flood defence is more than sufficient. However, if your site is in an area that could experience more extreme flooding (or if you’re planning for long-term resilience) you may want to consider supplementary solutions or use the Boxwall in combination with our other products.

At Flood Solutions UK, we’re always happy to help you assess the right level of protection for your property.

Want to learn more?

We’re here to help you find the flood protection that fits your needs. Whether you’re considering the NOAQ Boxwall or want to talk through more robust options, get in touch and let’s chat!