Patio Flood Risk Calculator for Homes and Gardens

Flood risk depends on factors like slope, soil type, drainage system, and patio material. This calculator gives you a score based on those inputs, helping you understand your patio's water retention and runoff behaviour.

Clay soil drains very slowly, holding water near the surface. When combined with flat patios or impermeable materials, it significantly increases the risk of pooling and flooding.

You can improve drainage with soakaways, channel drains, or permeable materials. In some cases, regrading the patio to improve runoff may be necessary. The calculator gives tailored advice based on your current setup.

Yes, materials like porous pavers, gravel, or permeable concrete allow water to pass through, reducing surface runoff and lowering the chance of flooding, especially when paired with a suitable sub-base.

Yes, it’s designed with UK climate and soil conditions in mind. Whether you're in a high-rainfall area like the North West or drier regions in the South East, it offers reliable flood risk estimates based on practical site conditions.