Gibbs Station 2-CS 931027 D, M. DOWDEY AND ASSOCIATES, ,NC.
CIVIL ENGINEERS
16250 DALLAS PARKWAY SUITE 100
DALLAS, TEXAS 75248 ,~
(214) 931-0694 FAX (214) 931-9538 .. ' ~J~ .
October 22, 1993
Mr. Kenneth Griffin, P.E.
City Engineer
City of Coppell
255 Parkway Boulevard
Coppell, Texas 75019~. ' ,~ [~g ~'~' '
RE: Gibb's Station'Flood Plain
Coppell, Texas
Job No. 91-077
Dear Ken:
Per our telephone conversation today, I have assembled the
documents that have been used to track the Flood Plain
Documentation regarding this project. Attached are the following:
1. October 16, 1991 FIRM for Coppell. Note that the
elevations adjacent to Gibbs Station vary from 446 to
448. Although I reference this data, the site was above
subsequent flood plain elevations. The important issue
with this map is that it more accurately reflects the
location of the flood plain. This was the official FIRM
documentation at the time of development. Also attached
is a copy of the aerial topographic map prepared by
Teague, Nall& Perkins, Inc. and Dallas Aierial Survey,
Inc. referred to as "Pre-Development Condition."
2. December 18, 1991 Preliminary FIRM for Coppell. When this
preliminary map was issued, it contained some corrections that
had been in error prior to issuance; however, the 100-year
flood plain elevation was raised one foot reflecting in water
surface elevations varying from 447 to 449 adjacent to Gibb's
Station.
The previously mentioned aerial topographic map supports that
even with this increased water surface, the site before and as
developed is not located within the 100-year flood plain and
that the flood plain shown on the October 16, 1991 map is
still most accurate.
3. October 15, 1993 Proof FIRM for Coppell. We recently received
this proof copy for our use. It is basically the same as the
December 18, 1991 map as it relates to Gibb's Station;
however, this time, it includes the lakes in the Lakes of
Coppell. Attached is additional topographic data prepared by
Dallas Aerial Surveys, Inc. referred to as "Post-Development
Condition." This information was supplied to support the fact
that the developable portion of the site is well above the
100-year elevation and the fact that our intent was not to
encroach into the flood plain as defined by the official
October 16, 1991 map.
Our intent in bringing this issue to a resolution is to obtain
a FIRM that clearly reflects the condition of the development. We
do not take issue with any individual, but we do need an accurate
FIRM.
The exhibits which have the development superimposed into the
above mentioned topography maps may be used to represent the
situation from an unbiased third party.
Please interact with FEMA on our behalf to rectify this
matter.
Sincerely,
William A. Anderson, P.E.
WAA/sg