The Trapezoidal rule of volumes V of an embankment divided into a number of sections equidistant D, is given by

• V = [A1 + An + 2(A2 + A4 + ... + An - 1) + 4(A3 + A5 + ... + An - 2)]
• V = [A1 + An + 4(A2 + A4 + ... + An - 1) + 4(A3 + A5 + ... + An - 2)].