Thank you Boondoggle, I'll have a look at that. Yes I am going to hire a engineer, I also have a friend who is a engineer that may help me with it. I am rethinking if I should do this project as many of you suggest if I am going to earn my money back. The main reason for my this project is irrigation as I have said but do be honest I will not be able to irrigate much hectares from it. Also if I build the dam at the proposed location there is a lot of trees that will also need to be removed and I am not so keen to destroy all the trees and wildlife in that area. Thank you everyone.