What is three wire leveling?

Three wire leveling is a precise technique used in leveling operations where measurements are taken using three wires—typically two outer wires and one central wire—on a leveling rod. The primary advantage of using three wires is that it allows for averaged readings to accommodate slight errors and improve accuracy. By taking readings from each wire separately, surveyors can calculate an average elevation, which reduces the impact of any individual reading that might be skewed due to slight misalignments or variations in rod placement.

This method proves beneficial in ensuring that the readings are consistent and reliable, thus enhancing the overall precision of the leveling process. It contrasts with other leveling techniques, such as differential leveling or the use of a single rod reading, which may not provide the same level of accuracy due to the increased potential for error.