Wood Zeppelin,
I highly recommend checking out "Cadillac Desert", either in book form or the video documentary. Fascinating stuff that's right under our noses that most people don't know about. It's a four hour documentary, I watched it in three sittings... they talk about the era of dam building frenzy, etc, etc.
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You answered none of my questions. I did review the film, which for the most part is excellent. I am very aware of the water issues in S. Calif. (N. Calif, and all of the Southwest.)
Could we go back to days before even the Spanish or Russians came to Calif? That was when S. Calif. began to change. I don't seen any fad, craze or building frenzy over the 100 year or so period when rivers were damed for various reasons. Glen Canyon Dam was put in place primarily for power generation. The damming of rivers still continues to this day.
If your point is that S. Calif. should have never been settled and developers should not have made profits, then I might agree with you. But the reality is Southern California went from 5,000 inhabitants when my great grandfather arrived in the 1860s as the Land Grants Attorney for Los Angeles to the population of about 29 million it is today.
Land speculators and persons who profit from land development are in business to make profits--greed, I don't know about that.
The article you cite only discusses the duration of 30 year cycles and dropping the relatively dry years of the prior cycles. Nothing to do with the construction of Glen Canyon or Boulder Dam. Rain is a minor factor in the hydrology of water flow in rivers in the American West. Snow pack is more a reliable measure.
Southern Calif. Arizona and Nevada will always be short of water--they are deserts. Yes, many exploited that land. Since the missionary period water has been in short supply and often mishandled.
I am not sure how any of this will impact the future of Lake Powell, Glen Canyon Dam or the Grand Canyon.