12-18-2020, 02:08 AM
I can't comment on the accuracy of the map and although I lived in HA for a time I don't know anything about flooding there.
But what I *can* tell you is that we get weather events that cause temporary flooding in areas that are not normally prone to flooding on a fairly regular basis. Getting 30 or 40 inches of rain over a weekend can cause flooding in an area that didn't flood the last time it had the same amount of rain because somebody uphill put a road in, or bulldozed a lot, or something. Pahoa's only feed store closed because somebody bulldozed a lot near them and it caused their store to flood every time there was a moderate rain, even though it didn't flood before that.
So whether the 2011 graphic is accurate or not, I'm not sure it makes that much of a difference unless its documenting 'regular' flooding.
But what I *can* tell you is that we get weather events that cause temporary flooding in areas that are not normally prone to flooding on a fairly regular basis. Getting 30 or 40 inches of rain over a weekend can cause flooding in an area that didn't flood the last time it had the same amount of rain because somebody uphill put a road in, or bulldozed a lot, or something. Pahoa's only feed store closed because somebody bulldozed a lot near them and it caused their store to flood every time there was a moderate rain, even though it didn't flood before that.
So whether the 2011 graphic is accurate or not, I'm not sure it makes that much of a difference unless its documenting 'regular' flooding.