This can save a great deal of time if you are using the cross section method. The spreadsheet included with this article includes formulae which have automated the process of calculating section areas using the trapezoidal rule. Other methods include drawing the sections in CAD and exporting areas or calculating areas mathematically using the trapezoidal rule. Multiplying the cell count by the area represented by each of the grid cells gives the cut or fill area for the section. Perhaps the simplest (but most time consuming) method is to plot the sections on gridded paper and count the grid cells of the cut and fill areas. There are several different methods used to determine the areas of cut and fill, once the sections have been plotted.
Once these volumes have been calculated for each pair of sections the total cut and fill volumes are obtained by adding them all together. The volume between each pair of sections is estimated by multiplying the average cut or fill area of the two sections by the distance between them. For each of the cross sections, the cut area and the fill area is determined. The cross section method involves plotting cross sections of the existing and proposed levels at regular intervals across the project site.
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