Flood Plain stuff.
Turns out all those maps, with the lines showing the limits of the flood danger, were calculated in 80's using a slide rule to crunch the numbers and a graphite pencil on vellum, with a bamboo scale, to locate them. The scale is approx 1 mile per inch.
Try to see the width of the line at that scale. It would fall between the two wood columns on the front porch.
The computer used at that time was an 8088. The models being generated today use cutting edge computers (not leading edge, not state of the art) and GPS triangulated data from hot s**t devices that are mounted on cars, boats, planes, trains and yaks, if the needs arises. It can measure a 400 meter swath of date as it rolls along at highway speed. (terrain and structures)
So the lesson of the hour: when you look at a map of the flood plain in your town and you see a line that says the flood plain is way across the road from your house and you don't need flood insurance. Well buy it, cause you don't need it and it's cheap. When, (when) the flood water rise up into your home, you will thank me, or not.
Oh buy the weigh, the numbers they are using for the flood water height are based on the NGVD 1929. The new numbers NAVD 1988, the factor of error is a foot, plus or minus. (either way you'er screwed)
Ok, still not convinced? Close all the doors in your house and stuff towels at the sills, ok now flood your house with 2 inches of water. How does it feel? Where's the cat? Did you pick up the blanket like I said?
Enough of that.
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