On 5/11/2012 6:46 AM, Jim Lux wrote:
On 5/11/12 5:23 AM, swingbyte wrote:
s disappointing!
I need to measure the height of my house floor to be above the flood
plane contour. I might have a look at some dted from work. Might have to
pay a real surveyor to measure the height datum.
Thanks for all the info though guys
for that, you need a real surveyor who can provide a "legally
accepted" measurement. Someone who can
a) know from the flood level definition what vertical datum they are
using (probably NOT something normal in the geodesy world)
b) knows the legalities of establishing the difference
The mechanics of surveying (leveling in this case) are straightforward
to learn. The legalities and local practices in documentation are
not. This is what getting a Land Surveyor's license is all about.
There's also a question of what the legal height of your house is,
relative to the property (from a flood insurance standpoint). They
might have some arbitrary offset in the rules. Sort of like how
baseline electrical power consumption is actually about 2/3 of the
expected minimum consumption in the area for a given size house and
appliances (e.g. nobody is likely to consume less than baseline)
There are some mortgage servicers, by the way, who take property
addresses that have been geolocated and FEMA flood plain definition
maps to determine whether you definitely don't, definitely do, or just
might need flood insurance. The maps change (as does the
geolocation). From what I understand, about 3-5% of the properties
scanned require some sort of manual intervention (maybe the address
doesn't geolocate, or it's right on the line, or)
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Actually, The percentage can be higher. The scale of the FEMA flood
panels are usually around 1=2000. Some of the older panels were
1=4000. The newest panels can be around 1=1000 (approx 5" to the
section). Horizontal scale is not the problem, it's the vertical
scale. Also how the stream bed profile was established (surveyed).
There can be a lot of change in the real world compared to was gets
plotted on the panel and in the profile. When there is an obvious
discrepancy between the two (mapped profile and real world) a registered
surveyor or engineer must be called in to reconcile the difference. The
cost for doing this might seem high, but when compared to the cost of
flood insurance paid over the life of a mortgage, it's very cheep.
Just my 2 cents worth. . .
Randy Hunt, retired Engineering Technician, Flood Plain Administrator
(32years)
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