Earthwork Volume Using Simpson’s Rule

Step by step procedure to find out volume of earthwork using Simpson’s Rule

This article is about using Simpson’s rule (also known as Prismoidal Rule) to find out the quantity of earthwork by means of contour maps. The procedure is explained here with the help of an example. In the example here below, the map is divided into 6 horizontal and 6 vertical grids each of 5m interval. The reduced levels are given at the intersections. Let us find out the volume of earthwork.

Let us first note down the reduced levels in a tabular form.

A three dimensional view will look like the following.

Suppose the final level for filling is 24.1m. Then the required depth of filling at each point is as given in the table below.

The area on the side of each grid can be found out as follows

Each side can be considered as a trapezoid. Hence the area of each side

eg: (0.98+0.97)/2 x 5 = 4.875

(0.80+0.80)/2 x 5 = 4.000

Now the volume according to Simpson’s rule is as follows

eg: (4.875+3.375)=8.25

4 x (4+3.75+3.925)=46.7

2 x (3.575+3.875)=14.9

Total = 69.85

Total earth filling volume = 341.425 x (d/3)

                                                           =341.425 x (5/3) = 569.042 M3

Note: We express thanks to for bringing up an error in this page to our notice which now has been rectified. You may download the excel file detailing  volume calculation using Trapizoidal Rule here.

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