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Sizer

Drainage & Rain Garden Sizer

Got a roof draining onto a path or borders that flood? Size a soakaway, a rain garden, or attenuation crates — for typical Fife rainfall.

Half a typical 3-bed semi roof ≈ 35–50 m². Whole roof ≈ 70–100 m².

Most of inland Fife is loam over clay. Coastal zones (Tayport, Crail) are sandier.

10-year storm is the standard for residential SuDS in Scotland.

Storm volume to absorb
1.1

m³ of water in a 10-minute design storm

Rain garden surface area
5.4

m² of planted depression at 200mm depth

Gravel soakaway pit
3.6

m³ excavation, gravel-filled (30% void)

Soakaway crates
2

Standard 1m³ modular SuDS crates

Why this matters

From 2017 (Scotland) every new build needs SuDS for runoff. Retrofitting one for an existing house? Not a legal requirement, but it solves flooding patios, drowned borders, and pooling at foundations — and it stops your run-off being someone else's problem downstream.

Rain gardens are gorgeous. Sedges, irises, ferns, hostas, marsh marigolds — they thrive in the drying-out cycle of a planted depression. Best of both worlds.

Solve a drainage issue

We do percolation tests, install soakaways, build rain gardens and divert downpipes. Send a video of where the water goes in heavy rain.

Discuss drainage