Amount of borrow needed to bring area to elevation of 90-ft, Civil Engineering

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Surveyed elevations are shown in Figure for a 50' x 50' grid at a proposed parking lot location. The amount of borrow needed to bring the area to an elevation of 90-ft is most nearly:

967_amount of borrow needed to bring the area to an elevation.png

Solution:

Find the average elevation:

Average = 87.6-ft + 87.6-ft + 87.6-ft + 88.6-ft / 4

Average = 87.85-ft

Change = 90-ft - 87.85-ft

in elevation = 2.15-ft

Fill Required = 2.15-ft x 50-ft x 50-ft

= 199-yd³

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