Carpenter

Dumpy Level

Reduced level from backsight and foresight.

Known reduced level(m)

Backsight(m)

Foresight(m)

Reduced level (new point)

9.4 m

Height of collimation11.5 m

fall0.6 m

Formula

RL = (known RL + backsight) - foresight

(10 + 1.5) - 2.1 = 9.4 m