Thinking of Arkstorm Again

Marguerite was musing:

I’ve been thinking about the “mega flood” of 1862. And the evidence of earlier mega flooding incidents in California history. In no way are we prepared for this kind of massive, catastrophic scenario, and I don’t know that we will be by the time it happens again. Lengthy article, but well worth reading:

What they found was stunning. The Great Flood of 1862 was no one-off black-swan event. Summarizing the science, Ingram and USGS researcher Michael Dettinger deliver the dire news: A flood comparable to—and sometimes much more intense than—the 1861–1862 catastrophe occurred sometime between 1235–1360, 1395–1410, 1555–1615, 1750–1770, and 1810–1820; “that is, one megaflood every 100 to 200 years.” They also discovered that the 1862 flood didn’t appear in the sediment record in some sites that showed evidence of multiple massive events—suggesting that it was actually smaller than many of the floods that have inundated California over the centuries.

This map from the report doesn't give me confidence.  The bottom of my basement is 23 feet and 8 inches above sea level.  Which I think isn't nearly high enough....