Which axis is associated with station numbers on the graph?

• A. X-axis
• B. Y-axis
• C. Z-axis
• D. A-axis

Answer: (B)

In this graph, station numbers appear on the vertical axis. The chart is drawn so that as you read up the page, you move along the chainage (stationing) of the project. Keeping station marks on the vertical axis makes it easier to line up the station value with the cross-section data shown at each level. The horizontal axis is used for the other variable on the graph (such as elevation, depth, or earthwork quantity), not for station numbers. So the stationing is associated with the vertical axis, which is why the answer is the vertical (Y) axis.