Lake Park-CS 901218 O.-'cetnber 5. 1999
Ms. ',3bobre l'~.%neshmand
Acting- CIE,'
Cit~,- c-f Coppell
Pos-'. Office Box 478
C,>ppell,'re~ 750~9
Status }~eport of Re,le~' of a Flocd~lai~ Determination
for /akepark Ad0itiou along Denton Creek ia Coppeil, Texas
Dear Ms Dar'~hr-~and:
3ne t'c. ltowing is ~ 3ummsry of our :-eview process to-date r~garding ~he subject pr~Nerty.
Action
August I ,'. iq9(: Completed firs: revie',~ ..... nd . _. item.~ -.vh[ch prec'u.aeu
~ecommendation et appro~.ai:
i. No Corps of Enginec~-104 pe:mit
2. Hydraulic mod~l changed channel roaghness values
although no work was comp!eted in :he channel
5eF,',ember t3. '990 Completed second r~v!e~, foulld tw,~ :re~,~ x-mca precluded
r~commendstion cf ~pproval-
i. No Corps of Engineers 404 permit
2. Hydlaulic mod~l need5 a~dirJona! cross-sections
adequ~te!$' model conditions, modifi.:afion vt e~fe.
flow. snd floo~w~N- mode; does no~ maich the !~[est
submitted :o FEMA on S~p[~mb~r fi~ i990
we h.~ve ~,e',v ~. ~.~pi, t~J ou~- ~hird review of ~he project and the foh,~wmg comments
sr~ offered c~s a le~u. if this review.
The Co, F~ of r(ng~nevrs 404 permit baa been requested; however, ir is ~till
~r~ p;ocess. We ha;e d,~c,~sed ;l~e ~a:ter with Mr. Richard Lc, we of the
Corps. and ~e has indicated rh~t the only item still onder rex'ie~' is
stc,,age ~omt,.at..ti..-- ·, ~ 'o-~,.. I hese are be[ng reviewed by Steve Pilnex.'. of the
CorFs [iydrol.ggy Branch We 5a,.e auempted re. contact Mr. Pdney;
h,::,ae~et: -,'e haxe not been ;,b[e to make centact ~ of yet To our
?:nc wl,dge, th, 4~4 permit has not beer received.
December 5, i990
2. It¢;orauli: Analysis
~. .-ks tnentioned in our ~eview of Seplember 13. the effect'_'xe flow
de£ini~ion (x3 card) .qhould be consistent w-ich the limits of the
f!ood~plai~.. 'Ills l,as not been mc, dified. The rist~ e£fecti,,e fl~w of
cros~-sections 25530 and 25770 show a small flow in the right
:.'.'erbank$, yet the floodplain deliuca0on shows no flow in thi.~ area
The x3 card fc.r fl~ese two cross-sections should be modified to block
this ine'/fectb, e flow.
b. '[he floodwcty analysis st'.¢wn in this report does not m:t[ch the exi.~ting
condition analysis shown in the report. The cross sections added to the
ex~stin8 condition were no! added m ~he f!ood~ay an~lys~s. Adding
the~e cros~ ~ection$ ma.v require a modification of the disch-~rge values
ia the split floodway.
¥.'e hux e discus'-ed this with Mr. Art Witne¥ of Dan Dowdy. Inc. These hydraulic corrections
are fa,r!y minor; laov.'e~er, we do not believe FI;MA would approve the report until the~e
cot:action.-., are made. The Corps 404 permit appears to be '.'e~'y close to appro~ ..... ~ i: i~
~.xpected ,.:, ~;ult in ol~ly .minor changes to the final design.
:Ye cannct recommend app~ox:~! until the at'cxe charges are made and a Corps 404 petmi: is
recei~ ecl. Pl~;a~e ter me know if I can provide add[tiona! in_"ormafion.
Sincerely.
KIMI_'I~ Y-HOP~X~ AND AK~O{7 I.~ I'ES,;
Ronald W. Morrison, P.E.
Senior Hyd~ ologist
pw