A trapezoidal canal of bottom width B, depth y, having a side slope of z : 1 (Horizontal : Vertical) is formed in cutting for a length of L. The volume of earthwork to be excavated in forming the canal for the length L is :
1
(B. y + 0.5 z. y2)L
2
\(L\ (B+2d{\sqrt{z^2+1}})\)
3
(B. y + z. y2)L
4
(B. y + 2 z. y2)L