Supplemental Contour Line

Supplemental Contour Line

• A. Shown in dashes. Show changes in elevation of at least one-half the contour interval.
• B. Shown in solid lines
• C. Represent water depth
• D. They are the same as index contour lines

Answer: (A)

Supplemental contour lines are dashed lines added between the regular contour lines to show elevations that occur in smaller steps between the main lines. They’re drawn in dashed style to distinguish them from the solid standard contours, and they represent elevation changes of at least one-half of the contour interval. This provides finer detail about the slope and terrain without increasing the number of solid contours. For example, with a 20-meter contour interval, you’d see dashed lines at roughly 10-meter increments between the 0, 20, 40-meter lines. They’re not about water depth, nor are they the same as index contour lines (which are heavier and labeled).

Supplemental contour lines are dashed lines added between the regular contour lines to show elevations that occur in smaller steps between the main lines. They’re drawn in dashed style to distinguish them from the solid standard contours, and they represent elevation changes of at least one-half of the contour interval. This provides finer detail about the slope and terrain without increasing the number of solid contours. For example, with a 20-meter contour interval, you’d see dashed lines at roughly 10-meter increments between the 0, 20, 40-meter lines. They’re not about water depth, nor are they the same as index contour lines (which are heavier and labeled).