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View Diary: Drowning Sacramento in a tide of oil. (54 comments)

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  •  I can remember driving over the Pioneer bridge, (2+ / 0-)
    Recommended by:
    RLMiller, KenBee

    which crosses the Sacramento just downstream from the M street bridge, during a very wet winter (1980??). It was high tide downstream and from where I was, the water looked like it was just about to touch the underside of the M street bridge. Imagine that river 10 feet higher. Over the levees it goes, definitely submerging Natomas (low land in the northwest corner of town between the Sacramento and the American rivers), and probably submerging a lot of West Sacramento, Bryte, Broderick, and other parts of Sacramento.

    Not at all over the top. Natomas is well under the level of the top of the river most of the year, already.

    •  My wife (mrsgoo) made me do this. (3+ / 0-)
      Recommended by:
      RLMiller, KenBee, offgrid

      You're mixing your metaphors. Climate change, global warming, whatever, is a different animal than what you describe.

      As a resident of the Delta since 1968 I have watched numerous high water events, We can attribute them to any number of influences.

      It kinda come's down to this. The M street bridge is not at sea level.

      It's kinda tough to equate sea level rise to some perceived need to build a Peripheral Canal Tunnel/Isolated Conveyance as justification.

      You're not doing this and I get it, but as you promote your perspective of this be careful.

      mrsgoo here: What mrgoo is saying is one of the reasons that Jerry wants to build the tunnel boondoggle is sea level rise. Their other excuse is earthquakes. IMHO if climate change results in less snowpack and more rainfall, then the argument needs to be made that we need more storage.

      if a habitat is flooded, the improvement for target fishes increases by an infinite percentage...because a habitat suitability index that is even a tiny fraction of 1 is still infinitely higher than zero, which is the suitability of dry land to fishes.

      by mrsgoo on Thu Aug 01, 2013 at 07:44:12 PM PDT

      [ Parent ]

      •  My apologies; here is clarification: (1+ / 0-)
        Recommended by:
        RLMiller

        Sea level rise will mean that:

        when there's a high-high tide downstream
        in midwinter during a really wet year
        when all of the dams are releasing lots of water

        that the water level on the Sacramento River will be pushed up even farther than we've seen it go;

        my anecdote was to convey the fact that even 30-40 years ago, there were some really scary high-water events.

        The year I saw this the Yolo Bypass was, as usual, already flooded as it is supposed to be. It was maxed out.

        If the Sacramento tops out even higher, levees don't even have to break- they'll be overtopped. This is most likely to happen as the high-tide wave from downstream sluggishly propagates upstream. This high-tide wave will be much higher 30, 50, 70 years from now than it was in 1967 or whenever it was I saw this, because of climate change. I might mention I lived in the Sacto area from 1950 to 1972 and go back for visits, so I know something of what I speak.

        So no, I didn't get this wrong and I was not talking about metaphors at all. I was talking about a predictable but not obvious consequence of sea level rise, that would be a very unpleasant surprise to

        West Sacramento is only 15 feet above sea level. Natomas is way low. Marysville has been flooded twice in my lifetime and it'll happen again. Forest fires will increase in severity and frequency, leading to increased runoff.

        mrsgoo is right that we need more storage, but I don't think we can put in any more dams without killing all the salmon. Ground-water storage needs to be vigorously pursued.

    •  natomas should never have been developed (4+ / 0-)
      Recommended by:
      RLMiller, KenBee, grover, S F Hippie

      even without rising sea levels, it should have been left as the sac equivalent of the yolo bypass.

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