One thing I have not read is any impact to the fish by pile driving. If they're pounding steel in the water deeper than 10 to 15', the sound pressure will most likely decimate anything up and down stream which is unobstructed by an island or bend in the river. I'd also be interested in reviewing a report on what's going to happen to the river down stream, now that the hydrodynamics are being altered. They're probably not wanting to publish this so they can do another emergency project in another couple years.
Good points. Some people are saying some previous gravel extraction projects caused more water going down Minto Channel that then caused the erosion problems that occurred at Island 22. Of course saying that all rivers have a mind of their own and are difficult to control during periods of high flow and during freshets as it moves gravel in different directions, all the time.
Many people that know the Fraser River well and see how wide and immense it is in the Lower Gravel Reach realize by digging out a few areas will prevent a flood is beyond me, its just too big an area to try and do so. For example at the Spring Bar site this is just a small dot of the river bed, the river then flows into the hole left after 400,000 cubic metres and how much water is that, not much I say.
The bottom line here people is it is just for the gravel, thats why it is happening, at the expense of fish habitat. It is a well known fact that gravel extraction in any river is not a good thing at all for fish stocks. You do some research on this and you will find it repeated time after time. You will notice that gravel extraction is mentioned along with fish habitat loss when the Outdoor Council of BC publish their top 10 endangered rivers list each year.
Google OC of BC to read the list and why they are in the top 10.
I by no means are an authority on all aspects of this subject like many others but when I read and hear from professional people at meetings I have attended I draw my conclusions. These professional have studied this for many years and do know the science that goes with it. That certainly tells me something.
I hope others continue to contribute their thoughs as well, to this complex issue.