@B STAR
We suggested our SS the same thing ! Why not have the fall of the roof to the left, and the downpipe running down left side of the pillar. But he insisted that the fall has to be on the front, and there is no other way to do it !
Very unhelpful of him, considering that they didn't even consult us before doing all this.
@the_milesy
Apparently the water board does not allow twists in the downpipes.. (so told to us by our SS)