Doug, I'm not sure about the science of it to be honest. The theorist used the Mid-East as an example (I think Israel is damming either Jordan or Lebanon's biggest river). He was arguing that damming and diverting rivers would agitate other states and result in hostilities between states. Also, there is some debate over the use of the Tigris River I believe in the Mid-East and I think there is a problem somewhere in Turkey over this.