Hi! I searched web but couldn't find the answer. I need to draw something like a diagram of The Role Of The Engineer in Wastewater threatment .. btw. i am studying Civil engineering.. it would really help me if you just gave me link of some page with something like this.. I searched all through my books and lecture notes but there is no such thing inthere.. please help my exam is very close and i have no idea how to make this one thanx a lot!