If A1, A2, A4 and A6 represent the areas of cross-sections of an embankment at a distance of D between them, the Prismoidal formula for calculating its volume will be:
AD/3[A1+2 A2+4 A3+2 4+A5)
BD/3[A1+4 A2+2 A3 + 4 A4+A6]
CD/2[A1+2 A2 +4 A3 +2 A4+A5]
DD/2 [A1+4 A2 +2 A3 +4 A4+A5]