If you are comparing flooding to the 1970s 1980s and 1990s this is pretty extreme.
This year is more like the flooding types of experiences we had in the 1970s to the 1990s. We have been in an extreme drought now for about 22 years or so. However, I have personally seen what flooding can do on the Carmel River by the flooding actually lifting a metal and cement bridge next to the Crossroads in Carmel on the river more than a mile down that river and into the ocean. If you looked at where this happened you would not believe this could actually happen. When I think about it the ONLY way this could have happened is when the trees in the flooding came up against the bridge it made a dam which then flooded the Crossroads mall completely including underground garages nearby. Then the water built up enough to push over the bridge. Once the bridge was on it's side I guess the water got enough pressure to push this whole cement and metal bridge all the way into the ocean from there which is over a mile. Looking at this place now you seriously would not believe this would be possible.
Yesterday Ben Lomand in the Santa Cruz mountains in California got over 7 inches of rain in one day. This flooded the San Lorenzo river and trapped many people in their homes. I also remember people's homes being washed away in the Santa Cruz mountains a lot during the 80s and 90s as well.
So, saying flooding will be 3 times worse in California by 2090 is quite serious when you have the altitude changes that we do here in California that go from Mt. Whitney at well over 14,000 feet down to around 300 feet below sea level in Death Valley, California. It is precisely because of the extreme altitude changes in California that destroy so many homes and have taken so many lives over the years. Because it isn't just flooding like in a river or a lake it is also Mud slides and rock slides like we had in Montecito in Santa Barbara that killed about 25 people recently in January 2018.
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