Earthwork Volume (End-Area)

Average-end-area and prismoidal earthwork volume in cubic feet and yards.

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Formula and source

Average end area V = (L/2)*(A1 + A2); prismoidal V = (L/6)*(A1 + 4*Am + A2); yd^3 = ft^3 / 27; adjusted volume = V * swell/shrink factor.

The average-end-area and prismoidal earthwork-volume methods per the FHWA and state-DOT earthwork references and FM 5-233, by name; first-principles.

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