Carter Phase 2-CS 980407 ~7' _. · -'r,'-'x .....
"...'V p>H ~-p3.T ..P~RS
Robert L. Wright. P.E. Tel: 214-357-2981
4 /~/ .~7I- E-mail: Fax: 214-357-2985
Senior Vice President
N. EEDHAM:a:cvberramp.net
March 25,1998
, !
Job No. 93-442-01 \/r) ~,~.,
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Mr. Ken Griffin. P.E .......
City of Coppel] ..-ro-~_~.~ ~'~:' ¥2 ..x.. .: ....
255 Park~vav Boulevard. 2nd Floor ."
Coppell, TX 75019 .'
R er Addition - Phase II .:~..3 ~.-~-y
Dear Ken:
In accordance with our recent discussions, enclosed is the following additional data requested on the
flood study fur the above referenced project:
1. Plots of the water surface profile
2. A copy of the FIRM delineating the proposed study area
3. Completed FEMA Standard Forms.
In addition to the above information, we have retained an environmental consultant to evaluate
compliance with Federal Regulations. Due to their current workload, the Corps of Engineers is now
relying on outside consultants to review and evaluate projects. The consultant has made a site
investigation and has determined that Section 404 of the Clean Water Act is not violated by this
project. A written report summarizing this investigation will be sent to us in the next few days and
I will forward this information to you as soon as I receive it.
Also enclosed from the flood study is a copy of the existing and proposed water surface elevations
for the project. As indicated, there are no increases in water surface elevations as a result of this
work.
If you have an3' questions or require an3' additional information, please do not hesitate to call.
Sincerely,
Robert L. Wright. P.E.
Senior Vice President
.
10290 MONROE DRIVE, SUITE 101 / DALLAS, TEXAS 75229(
Kirnley-Horn
and Associates, Inc,
SJite ' 80C
June 15, 1997 '2730 Par< Cer:'a Drve
Da'las. Texas
Director of Engineering and Public Works ,
Coppell. Texas 75019
Re: Floodplain Review for ~.lJtdition
Dear Mr. Griffen:
We have completed a review of the subject request for letter of map revision. The following is a summary
of the results of this review:
I. The study does not contain the Standard Forms require by the Federal Emergency Management Agency .... "
(FEMA). Before the study can be approved these forms must be completed.
2. No water surface profile plots were provided, lhese are required by FEMA and should be provided to
evaluate the results of the hydraulic analysis.
3. FEMA requires a plot showing the proposed model delineation within the FEMA floodplain shown on
the effective Flood Insurance Rate Map (FIRM).
4. Coppell ordinance requires compliance vd. th all applicable Federal Regulations. Information should be
provided that Section 404 of the Clean Water Act (wetlands) is not violated by the proposed project.
We have reviewed the modeling efforts for the existing and proposed model and believe that they are
appropriate.
Sincerely k/~-O 4'-
· . RonaldW. Morrison. P.E. CFM':.(J~.[/~,£. '20~r,-vL-/- c..?6.~-z r4re:,'31 ¢uo~-~ ~:-~¢~?=.O~em?¢ ,'".-'";'
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TEL 972 773 '3C0 [.
FAX 972 239 3820
CROSS SECTION 100-YEAR FLOOD ELEVATIONS
Ex. CONDS. PROP. CONDS. DmFERENCE
18600 ' ' = 468.59 ':: .': 468.59 ,... -~
18650 ': ': 468.53 ":. ~ 468.53~ .....
19034 ,~ .c . L!. 469.67 469.64 5' ' '" -0.03
19320 ~ ~l. 470.16 470.16 'l-oz ,.;~ ....
20000 ;- o. '~,J 471.82 471.81 -0.01
20540 -'-"-" 472.88 ~'"'-"'~ 472.87 -0.01
0.6 '"", "';->473.58 ~' t 473.57 -0.01
As seen in Table 2, the proposed improvements will not increase the water surface
elevations of the design bas~ flood (fully urbanized watershed). The 100-year flood elevations
computed in model PROULT29 were used to set minimum finish floor levels on proposed lots
as shown in Exhibit A.
The City of Coppell Floodplain Management Ordinance requires that the proposed
development not increase the effective F.I.S. base flood elevations by more than one foot.
Model PROEX29 was prepared to evaluate the impacts of the proposed improvements on the
100-year flood with the existing watershed condition. A comparison between the water surface
'. profile computed in models CAREX3 for the existing flood plain and PROEX29 for the
proposed flood plain evidences very small changes in water surface elevation through the project
-9- Jerry Patchy' Consulting Engine. ers
"~ .';" '-" "." ~---~.'" -~-~'~ P.O. Box 478
~ ..:.. ..:..---,, Coppell, Texas 75019
,,~:.' ...,--,, . The City With A Beautiful Future 214-462-0022
April 4, 1997
Kimley-Horn and Associates, Inc.
910 Collier Street
Fort Worth, Texas 76102-3542
Attn: Ron Morrison, P.E.
RE: Floodplain review for Carter Addition
This flood study has been processed to you in accordance with our contract with Kimley-Horn
for the review of flood studies for the City of Coppell.
Under the terms of the contract, the review fee for this flood study is based on an hourly rate
not to exceed $1,000.00. If you should have any questions concerning this please feel free to
contact me at your convenience.
Sincerely,
Director of Engineering and Public Works
file/kgriffin, carter, fs .