Hey ranger mate, you have come up with some great questions. Why not forward them to the decision makers. I did, when i heard they wanted to install weirs on a certain section of the murray, which would have hurt fish stocks in this area. I dont know if it helped but i got a got a letter explaining their veiws, and i continued to converse with them about it. If i was you i would send them an email, you may get some answers to your questions.