I think the rationale for that is that the gravel accumulation occurs on an ongoing basis, and there's a concern about only harvesting gravel in an off year or in an even year and having to take very substantial quantities in a short time. You'd be effectively doubling up. Right now, we take gravel every year. If you only did it every other year, which is what you've noted, you'd be doubling the amount of gravel that you'd be removing in one year.
For example, let's roll back Big Bar and let's pretend Big Bar is next year. Instead of taking 50,000 cubic metres, we would be taking 100,000 cubic metres. So the issue is, how feasible is it to take 100,000 cubic metres from one site in a narrow window of time, taking into consideration when you can access the site because of safety issues, and when you have to leave the site because of other salmon that are present in the system that are not pink salmon? So the challenge is how to distribute the gravel removal over a reasonable period of time.
Again, the basis upon which we are doing this is based on a science assessment. This is the recommendation that we're following.