Question

The jobsite has a primary vertical control point with a reference (BM) of 100 feet. An instrument is set up with an HI of 9.76' above the BM. A grade stake is set at an elevation of 98.5'. What is the height reading on the rod for setting the receiver at?

Answer 1

The height reading on the rod is 11.26 ft

Step-by-step explanation:

Given;

Benchmark of the vertical control point, BM = 100 ft

Height of instrument, HI = 100 ft + 9.76 ft = 109.76 ft

Height of stake, H = 98.5 ft

The height reading on the rod is the foresight reading, gotten by subtracting height of stake from height of instrument.

The height reading on the rod = HI - H

The height reading on the rod = 109.76 ft - 98.5 ft

The height reading on the rod = 11.26 ft

Therefore, the height reading on the rod for setting the receiver at an elevation of 98.5' is 11.26 ft