Certified Storm Water Operator Practice Exam

Which term refers to the vertical distance on a topographic map?

1. Gradient

2. Elevation

3. Contour interval

4. Slant distance

The correct answer is: Contour interval

The correct response pertains to the contour interval, which denotes the vertical distance or the difference in elevation between successive contour lines on a topographic map. Contour lines represent areas of equal elevation, and the contour interval provides a clear understanding of the steepness or gradualness of the terrain. By indicating how much elevation change exists between lines, it allows for effective interpretation of the landforms and assists in planning for stormwater management by understanding how water will flow and pool based on topography. The other terms do not specifically refer to the vertical distance between points on a map. Gradient relates to the rate of elevation change over a certain distance, elevation refers to a specific height above a reference point, usually sea level, and slant distance is a measurement that combines both horizontal and vertical distances, which is not focused solely on vertical change.