Question 324636
{{{drawing(300,300,-10,10,-10,10,locate(-1,6.3,100),locate(-6,5,1),locate(-6,2.7,4),line(-5,5,5,5),line(-5,5,-5,4),line(-5,4,5,4),line(5,4,5,5),line(-5,4,-5,0),line(-5,0,5,4))}}}
Break it up into a rectangle (1m x 100m) and triangle (base 4 m, height 100m)profile. 
The volume would then be,
{{{V=1(100)(40)+(1/2)(4)(100)(40)}}}
{{{V=4000+8000}}}
{{{V=12000}}}m^3