Settlement monitoring system and method

A movement monitoring system comprising:

• an elongate liquid vessel;
• a continuous body of liquid within the liquid vessel;
• a first sensor housed within a first portion of the liquid vessel;
• and
• at least one additional sensor housed within a second portion of the liquid vessel,
• wherein the first sensor and the at least one additional sensor are each submerged within the liquid, the first sensor is capable of detecting a pressure and a temperature of the liquid local to the first sensor and the at least one additional sensor configured to detect a pressure and a temperature of the liquid local to the at least one additional sensor,
• wherein in use:
• the first portion of the liquid vessel is configured to be situated at a known reference point;
• the second portion is configured to be attached to or embedded within a body of material;
• pressure and temperature values detected by each sensor are communicated to a processor, the processor being configured to:
• correct for variation in liquid density based on the detected temperatures;
• and
• calculate a vertical separation between the first sensor and the at least one additional sensor based on the detected pressures and the corrected liquid densities;
• and
• wherein a surface system is configured to calculate the vertical separation between the first sensor and the at least one additional sensor using the pressures.