I suppose there is loss back into the atmosphere during the summer, but that would be minimal. There isn't a loss during the winter. So there is not much of a loss in the system. But there is a timing challenge. It does take time for the fine particles, and silt particularly, to settle out.
I attached an information sheet to your document. I'm not sure if it answers all those questions on the region and water use.
It's unfortunate. I was just recently at the Alberta inquiry, and I know the government has put out very specific documents on water usage with the oil sands development. It's in a lot more detail, and I could certainly forward that material. Maybe representatives from Alberta are going to be here shortly to bring that material to you, but I can certainly forward that to you, if that's helpful.