Villages C P3&4-CS 920410 Morrison Hydrology/Engineering, Inc.
520 Avenue H East · Suite 102 · Arlington, Texas 640-4554
APR 10199~ :1
By:,Engineering-
April 10, 1992
Mr. Ken Griffin P. E.
City Engineer
City of Coppell
255 Parkway Boulevard
P. O. Box 478
Coppell, Texas 75019
Re: Request for Conditional Letter of Map Revision for Elm Fork
Trinity River and Denton Creek Floodplain Reclamation Study
Villages of Coppell Phases 3 & 4
Dear Mr. Griffin:
Attached is a copy of the report for the subject revision request
along with a draft submittal letter to FEMA. If you have any
questions please call.
Sincerely,
MOI~I$ON HYDROLOGY/ENgINEERING, IN(:.
Ronald W. Morrison, P. E.
Senior Hydrologist
March 20~
PoM-IITM b~n~l fax lmne~i~l me~o ~ ~ w a~ p.~ ~ ~
City of C~peII
2~ Parkway B1vd ..........
P. O. Box 478
Coppell, Texa~ 75019
R~m ~cond r~vi~w of Elm Fork of T~inl~ R~ver ~nd Dmn~ C~eek~
Ct~ of Coppell, Dallas Co~y, Texas Fi~dplatn
8~udy~ Village ef Coppall Phases B G 4 by Don A. Tipton,
Inc. of 8a~iend~ Texas
Dear Hr. 8rtffi~m
~ith City of CopDeIi ~dtna~ce 87390. The following cemmen~s fPom
1. ~he~e was a~ inc~eaae in ~he ul~ima~e c~n~i~ion wa~e~
which is n~ allowed acco?ding ~o the city ordinance. The
la~es~ submittal addresses ~his problem by demonstrating
Ne no~ed tha~ ~he entries in ~he Denton Creek FI8 *'Q,, -100
There Were also soma at.tints in the ultimate ,,g,, -t~
requirement s, or dinancm
2. /Our earl iet revie~ requested ehat ~he floodway be located
the floedway. Thi~ haB bean accomplished.
3,~Our firs~ ~eview requea~ed ~hat the correc~
shoui~ be shown on the proposed condition maps.
been accomplished, This hal
4. ~Oue fi~s~ review n~ted ~ha~ a Corp~ 404 permi~ was
FiPR-17-92 FRI 16:06 TIPTON ENGINEERING FaX NO. 2142261946 P, 02
provided. This la~es~ s~bmit~a! has included a Co~ps 404
d~ermina~io~ and sufficiently addree,ed our concerns,
5. ~ Our lnittal
review noted that no~ al l of the
Th~s has been accomplished.
6, ~ The ~oe of fill in aha original
property
line. This has bean .exeended pas~ ehe
retaining wall a~ ~e property line. C°e~ected by adding
~ .b~ing Comple~e~ a ~ b~an erosion pro~ec~ion
These models showed no increase in
~[d[~a~ce requirements, That= ~- _f!~. l~ve~s, wh.tch
4C~uailv ~x~-~-- ~_~nu~1on dls~hayge va/ e uns
~=ase ~iScharge. This ul~:[~ ~n~r mod~[ showin
-~-z~zona~ l~fOrma~io- 4- ~-, --~or~ ~o FEMA whil~
,, ~ ~eing prepared. -"'
We are available ~o discuss ~his second review if ~eeded. Pleaae
cai l
I'#]RRISON HYDRI]LO;W/ENI~II~;ER~rNEi, IN~.
Ronald W. Hor~tson, p. £.
8anior Hydrologt~