Ground Elevation and Compaction Concepts

The video tutorial explains how to solve a problem involving current and planned elevations on a grid. It covers the concepts of existing and finished ground, swell and shrink factors, and how to calculate the necessary fill or cut. The tutorial includes interpolation between grid lines, calculating average changes, and determining the volume in cubic yards. It concludes with final calculations and considerations for practical application.

What does the dotted line represent in the grid legend?

• Planned elevation

• Current elevation

• Average elevation

• Future elevation

What is the term used for the planned elevation?

• Projected ground

• Finished ground

• Base ground

• Existing ground

If the finished ground is higher than the existing ground, what is required?

• Excavation

• Cut

• Fill

• Leveling

What is the swell factor used in the demo?

• 10%

• 12%

• 15%

• 18%

What happens to the material when it is compacted after being filled?

• It remains the same

• It swells

• It evaporates

• It shrinks

What is the first step in determining the current elevation at a grid point?

• Check the solid line

• Interpolate between dotted lines

• Measure directly

• Estimate visually

How is the midpoint between two elevations determined?

• By dividing by the number of points

• By subtracting the smaller from the larger

• By averaging the two values

• By adding a constant

What is the difference between the existing and finished ground if the existing is 156.6 and the finished is 157.2?

• 0.4

• 0.6

• 0.5

• 0.7

What is the average change in elevation if the changes are 1.6, 0.3, 1, and 2.5?

• 1.3

• 1.0

• 1.1

• 1.2

What is the area of a 30-foot grid?

• 900 square feet

• 600 square feet

• 800 square feet

• 700 square feet