HomeMy WebLinkAbout20020485.tiff CAROL Harding - flood plain determination
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From: Myrna Folsom <myrna_f 2000@yahoo.com>
To: Carol Harding <charding@co.weld.co.us>
Date: 2/22/02 7:37AM
Subject: flood plain determination
To: Weld Board of County Commissioners
From: John Folsom
Dear Commissioners:
From time to time, there come before the Board
proposals for development that involve lands that are
in 6100 yearn floodplains. The determination of what
lands are in the floodplain essentially is derived
from areas designated with various flooding exposure
on Federal emergency Management Administration [FEMA],
National Federal Insurance Rate Maps [FIRM] maps.
In evaluating the information given on these maps,
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it should be considered that some of it was determined
many years ago [circa 1980] by estimates, rather than
on the basis of information obtained by hydrographic,
hydrological, hydrostatic or other accepted flood
hazard evaluation methods. An example is of this is
panel 850 No. 080266 0850C on which the extent of the
floodplain was based on anecdotal historical
information. Furthermore, the accuracy of the
information on all of these maps is now uncertain
because of changes that have occurred naturally or as
result of permission granted to alter the topography
in the floodplain. Apparently, a lack of funding is
preventing the revision of the maps based on
conclusions derived from reliable engineered study
data.
One gets the impression that it is perceived by many
that a CLOMR or LOMR study reviewed by FEMA implies
that the land involved is secure from flooding. This
is not the case. Such a study is only for the purpose
of determining what effects any changes made to the
topography in the process of development will have on
the floodplain.
Additionally, the issuance of a county Flood Hazard
Development Permit only provides for requirements that
might have some minimal mitigation of the affects that
flooding would have on structures build in the flood
plain.
Taken together, the CLOMR or LOMR studies and Flood
Hazard Development Permit may have the effect of
giving the public, and indeed, the governmental
entities approving development in the floodplain, a
false sense of security that they are protected and
immune from flooding or its effects. In considering
cases where these circumstances are present, it might
be indicated to be cautious so that the health, safety
and welfare of the public are protected.
Very truly yours,
John Folsom
OCntatr 'k-
2002-0485
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