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 in to 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
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 https://www.e-quantities.com/volumes.htm 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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