L2 Foundation Unit 103 (1/2)

Front

What are two key purposes of surveying before construction begins?

Back

To determine the distances between set points and to record the levels and features of the existing ground.

Front

During construction what four key aspects does a surveyor set out and ensure are correct?

Back

Roads, drains, foundation heights, and the positions of buildings or structures.

Front

Surveying ensures that drains are constructed to fall at the correct _____.

Back

angle

Front

What is the name of the simple traditional surveying method used for small, fairly level, and open areas?

Back

Chain surveying.

Front

Chain surveying uses a network of _____ to plot positions.

Back

triangles

Front

What surveying method is used when an area is too large for chain surveying?

Back

Compass surveying.

Front

Compass surveying cannot be used in areas containing what two features that can affect readings?

Back

Iron ore or power lines.

Front

While chain surveying uses triangulation, compass surveying uses a method called _____.

Back

traversing

Front

What are Ordnance survey benchmarks referenced back to?

Back

The mean sea level from Newlyn in Cornwall.

Front

What is a temporary benchmark on a construction site?

Back

A fixed point on site that is referenced from an ordnance benchmark, used for all other height and position calculations.