Earth Resistance survey
Earth Resistance surveys are a cost effective way of locating and mapping the foundations of buildings and formal garden features.
They are usually carried out in small targeted areas. The instrument works by passing a small electrical current through the earth and measuring the resistance. In a typical survey, a wall or solid structure would offer high resistance. On the contrary, a ditch or large pit would produce low resistance.
Typical targets would include:
Walls – Foundations – Roads
Formal Gardens – Paths and Drains
Ditches – Large pits
Bedrock or Water table