Villages C P3&4-CS 970927September 27, 1997
Mr. Ken Griffin ~,~_0
City of Coppell
255 Parkway ~k,]
PO Box 478
Coppell, Texas 75019-4409
Re: Information as per the development of Villages of Coppell III B and the attached
Floodplain Development Permit # 920604 DAT
Dear Ken:
As per the letter dated September 9, 1997, I requested copies of the following data. You
were kind enough to allow me to review the city files which might contain the information
requested. After reviewing those files, this letter shall serve notice as to the informatior~
that I was able to find, and to inform you as to that which is not a part of the City files.
Each of my request items is reiterated in italics below, and followed by my findings.
· Letter dated 4/10/92 - Ken Griffin's request of FEMA for a Condition Letter of MaF
Revision (CLOMR) to the Effective Flood Insurance Rate Map (FIRM) for the CiO; of
Coppell, last revised October 16, 1991. Including all of the data needed to procexx
the CLOMR. that was included with the submittal of the aforementioned letter.
I did not find the submitted data or a copy of this letter, which I assume would also list
those items which were submitted to FEMA.
· Letter dated 6/5/92 -from Bob Porter, Project Manager for Tipton Engineering to
FEMA regarding the subject CLOMR. Including all of the data needed to £roccx,~'
the CLOMR. that was included with the submittal of the aforementioned letter.
I have a copy of this letter. But I do not have any of the data referred to in the letter.
· Letter dated 6/30/92 -from Richard Hovas P.E. VPfor Tipton Engineering to t:EgdA
regarding the subject CLOMR. Including all of the data needed to procesx the'
CLOMR. that was included with the submittal of the aforementioned letter.
I did not find a copy of this letter or the supporting data.
Mr. Ken Griffin
September 27, 1997
Page 2
· The report entitled "Elm Fork Trinity River & Denton Creek City of Coppell, Dallas
County, Texas, Floodplain Reclamation Study, Villages of Coppell, Phases 3 & #,
Request For Conditional LOMR, prepared by Don A. Tipton, Inc.
I did find this report and made copies of those pages I found to be pertinent. I may
need to borrow the "study" in the future.
· The Stability Analysis for the proposed Gabion Wall along Deforest Road between
Cross Sections 18440 and 19930 as requested by William R. Locke/FFfldA in the
letter dated September 8, 1992 to Mayor Mark Wolfe / City of Coppell.
I did not find a copy of this stability analysis.
· All information and data as it pertains to the "ongoing restudy of the Flood
Insurance Study (FIS) for the City of Coppell." As requested by William R.
Locke/FEAdA in the letter dated September 8, 1992 to Mayor Mark Wolfe / CIO/' of
Coppell. I am assuming that this restudy will reflect a date at which it became
effective.
I did not find any information regarding this restudy or anything relating to the flood
study referred to in the attached Flood Plain Development Permit # 920604 DAT,
which needed to be approved by FEMA prior to building permits being issued as it
pertains to the Villages of Coppell Phase IIIB. As per the CLOMR dated 9/8/92,
"Because this request is based on flooding information contained in the restudy, a final
map revision for this project can only be processed after the restudy becomes
effective."
· HEC-2 Hydraulics Model and any updates to this model. It is my understanding that
Nathan D. Maier Consulting Engineers was involved with the design of this model.
That Don Tipton Engineering was also involved with the design and/or used the
information derived from the model. I also understand that Ron i~4orrison / Ki~:k9,
Horn & Assoc. performed an update to this model between the years 1989 and 1993.
Upon review of every HEC-2 study that I looked at, I did not come across any update
to the HEC-2s as referred to, and recognized by FEMA, in the FIS dated October 16,
1991. I assume there is an updated HEC-2 in the restudy we can't locate.
· A copy of the ordinance that defines the "Maximum Permissible Velocities" as' it
pertains to the design of channels, overbanks, and shallow flooding areas as outlined
in the City of Coppell Subdivision Ordinance. And any other city ordinance
pertains to the development along creek banks and flood prone areas.
I did not find the city ordinances that contain the information requested.
Mr. Ken Griffin
September 27, 1997
Page 3
· Ordinance No. 87390.
I have a copy of this ordinance.
· Floodplain Development Permit, Application No. 910807 DAT, relating the
development of the Villages of Coppell III B. I want all of the information regarding
this permit and application.
I found a Floodplain Development Permit # 920604 DAT for the Villages of Coppell
Phase IIIB in the city files. However, on the final plat dated 11/30/92, it refers to a
Floodplain Development Permit # 910807 DAT. Which permit relates to the Villages
of Coppell Phase IIIB? The additional technical data and narrative I am looking for,
but did not find with permit # 920604 DAT, is described in Ordinance # 87390 page
24, Section C and page 37, Item 9, paragraph d.
· Flood Hazard Boundary Map (FHBM). I have a copy of the most recent FIRM.
I did not find a copy of this map. I understand that it outlines the "Floodway"
boundaries. I know that FEMA used this map as late as 3/88.
Since I can assume that the information I did not find is not in the City files, I would
appreciate your directing me to the source of this information. I would also appreciate a
call at your earliest convenience.
Thank you again for your time and efforts.
977 Parker Drive
Coppell, Texas 75019
972-304-3260 Day
972-393-1090 Night
PROPERTY WITXlR FLOOOPLAIN
STATE OF TEXAS : ~ ·
COUNTY OF JALLAS :
CITY OF COPPELL~-
The above named per~ittee applied for a DEVELOPMENT PEP~IT off .
The application has been reviewed by the AI?MINISTPATQR and it is his
determination that the proposed development IS located within
identifiable flood plain of . ~-~A~ ~~___ ~
The ADMINIST~TOR has ~evi~w~d plans and specifications of the pro~o~ed
development fo~ conformance with the development standards required by
' COPFELL ilood plain ~anagement regulations, You are hereby authorized to
proceed with the following describe~ work:
On the following described p[o~erty:
To malntain compliance with the development standards of COPFELL flood
plain management regulation~ and to eliminate or minimize flood damage
potential to the proposed 0evelopment, you are hereby 'directed to
construct your P~oposed development in accordance with the tOllowlng
Lpyial provisions:
(~; ;esldential ~tructures, the lowest [loot [ineludlng
/~ust be ~levated to two (2] f~t abov~ th~ IO0-~ar base flood
elevation. Minimum finished floor elevations must be shown on the
plat for the development as approved by the City Engineer. (The
~owest floor must be elevated two (2) feet above BYE. or one (i) foot
above ultimate condition whichever Is higher).
] For non-residential structures, the lowest floor (including basement)
must be elevated or fl~dproofed to two (2} feet above th~ lO0-year
base flood elevation. Minim~ finished floor elevations must be
shown On the plat or site plan aS approved by the City Engineer.
(The lowest floor must be elevated two (2) feet above BYE, or one (1)
foot above ultimate condition whichever ts higher.
( ) Fermittee must submit a certification from a registered pro~essional
engineer, architect, or land ~urveyoc that the finished ~lOor level
of the residential structure has been constructed two (2) feet above
the 10Q-year base flood elevation, Or one (1) foot above ultimate
condition whichever is higher.
( ) FOr non-residential fioodproofing, a registsred professional engineer
or architect must certiiy that the ilood~roofing methods are adequate
to withstand the flood de~ths, pressures, velocities, impact and
uplift force~ and other factor~ associated w~th the base flood.
( ) For fill activities, the ~ermittee must submit a certification from '
an engineer or land surveyor that the levet of the
material is ~t or above the elevation of the Ba~e ~lood.
(~vide a certified copy of all iina1 ~lans or As-Built D~awlnqs to
the ~MINIST~TO~,
ACKNOW~ED~E~ ~,~O~ITIONS BY PE~ITTEE