Summary site descriptions and hydraulic conductivity test methods employed
| Site | Type/vegetation | Age of structure (years) | Predominant materials | Operator | Test methods | No. of tests |
|---|---|---|---|---|---|---|
| Newcastle (BIONICS) | Trial, embankment/grasses | <10 | Glacial till (PI = 16%), capped with a 0.5 m coarse gravel | Newcastle | Guelph–single cell | 85 |
| Laverton, Gloucestershire | Rail, embankment/mature trees and bushes | >100 | End tipped local Charmouth Mudstone (PI = 30–40%) | Queen's–Bath–BGS | Guelph–double-ring | 8 |
| Charing, Kent | Rail, embankment/mature trees and shrubs | >100 | Gault Clay (PI = 35%), industrial ash | Southampton–Mott MacDonald | Guelph | 4 |
| Newbury, Hampshire | Road, cutting/grasses and shrubs | <20 | London Clay (PI = 35%) | Southampton | Double-ring–Guelph–single cell–bailout | 23 |
| Craigmore, Northern Ireland | Rail, cutting/grasses and shrubs | >100 | Glacial till deposits (PI = 12–17%) | Queen's, Belfast | Guelph | 11 |
| Loughbrickland, Northern Ireland | Road, cutting/grasses and shrubs | <10 | Glacial till deposits (PI = 16–25%) | Queen's, Belfast | Guelph | 12 |