Posted By Leland on 03/01/2014 1:59 AM
At my last NFIP certification class the instructor mentioned something about floods that are related to fires, he flashed something on the screen, maybe it was a new rule or guideline and he seemed to say something to the effect that nobody knows or ever heard of such a thing so let's go to the next slide.
I have attached a photo taken in Glendora Ca after the recent wildfires. Anybody guess what the government workers are doing in the photo? And how it might relate to flooding?
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I lived in SoCal for many years Leland. Wildfires burn hillsides and vast areas and all the vegetation is consumed as fuel for these fires. So now the hillside has no vegetation and therefore no longer porous. As such the water instead of being absorbed sheets off these hillsides and wala instant flash flooding.
Whilst not positive, looks like they are embedding bio degradable mesh (almost twine like characteristics) into the burned out hillside. Kind of the same concept of wire mesh in concrete strengthens the slab. They then do some type of hydroseeding to encourage vegetation growth to strengthen and aerate the top soil
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