|Willow spiling wall comprises posts and withy infill. |
Image from JPR Environmental
A willow spiling wall consists of two elements:
- Live timber posts measuring at least 100mm in diameter (being a natural material, the size will vary somewhat) which are installed at 0.6 to 1.0m centres like a king post wall.
- Willow "withies" are woven between the posts to form the infill panels (as this is a fairly open weave, a layer of Terram is advised on the landward side of the wall to prevent loss of fines). Backfill to the retaining wall should comprise silt, sand or gravel.