A 3:1 grade fence with an 18-foot run has what height?

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Prepare for the CR-21 Landscapes and Irrigation Test. Utilize flashcards and multiple-choice questions featuring hints and explanations. Get exam-ready!

Multiple Choice

A 3:1 grade fence with an 18-foot run has what height?

Explanation:
In a 3:1 grade, the vertical rise is one unit for every three units of horizontal distance. So the height is one third of the run. With an 18-foot run, the height = 18 ÷ 3 = 6 feet. Therefore the fence height is 6 ft. The other numbers don’t fit this ratio: 3 ft would require a much steeper rise, 54 ft would mean a rise three times the run, and 15 ft isn’t one third of 18.

In a 3:1 grade, the vertical rise is one unit for every three units of horizontal distance. So the height is one third of the run. With an 18-foot run, the height = 18 ÷ 3 = 6 feet. Therefore the fence height is 6 ft. The other numbers don’t fit this ratio: 3 ft would require a much steeper rise, 54 ft would mean a rise three times the run, and 15 ft isn’t one third of 18.

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