Work out reduced level from staff reading instantly with clear inputs, formula shown and shareable results.
With the height of collimation known, every reduced level is simply that height less the staff reading. Comparing the result with the design level gives the cut or fill, and the staff reading that would indicate exactly design level is the height of collimation less the design level, which is the number the setting-out crew actually works to.
Reduced level
RL = height of collimation - staff reading
Setting out
Target staff reading = height of collimation - design level
RL = height of collimation - staff reading. With the height of collimation known, every reduced level is simply that height less the staff reading.
It removes arithmetic from the field. The operator raises or lowers the surface until the staff reads the target, with no calculation per point and therefore no mistakes.
This calculator takes 3 inputs: Height of collimation, Staff reading, Design level at the point. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.