carpenter, reading plans

[katana]

What are the two ways levels can be represented on a set of plans. the reduced level I suppose is one but I am unsure on the other way. i need this for tec thanks for any help

[Rowley]

On one sheet of a set of plans is a site plan this plan should show the contours of the block. Once the outline of the building is shown on this "drawing" the levels are easy to obtain.
Rowley.