Prismoidal Method :

•Prismoidal method is a method of calculating volume of all geometric solids that can be considered prismoids.

•The prismoidal formula is also known as Simpson's rule.

•Prismoidal formula is more accurate than any other method available for calculating volume.

•Volume (V) of the earthwork between a number of sections having area A₁, A₂, …, An spaced at constant distance d apart is