FS9901-CS 991026and Associates, Inc.
October 26, 1999
Mr. Ken Griffin, P.E.
Director of Engineering and Public Works
City of Coppell
P.O. Box 478
Coppell, TX 75019-4409
Re: Review of CLOMR for Windsor Estates and DeForest Court
Suite 1800
12700 Park Central Drive
Dallas, Texas
75251
Dear Mr. Griffin:
Kimley-Horn and Associates, Inc. has reviewed the Request for a Conditional
Letter of Map Revision on Denton Creek for Windsor Estates and DeForest
Cour~ prepared by Halff Associates, Inc., dated September 1999.
The submitted report only includes data required by FEMA (i.e., flows based on
existing watershed conditions or regulatory discharges). The report does not
include data related to the City's floodplain ordinance, such as analyses using
fully developed flows. Our review of the above-described study is based on
adherence to FEMA criteria only. Kimley-Horn recommends that the following
items be addressed for the submitted report:
During large storm events, the floodplain for Denton Creek spills over Gun
Club Road and drains into the Elm Fork of the Trinity River. The model
accounts for the weir flow over Gun Club Road by reducing the flows in
Denton Creek. Calculations for the amount of weir flow over Gun Club Road
should be submitted to justify the reductions of flows in Denton Creek.
The proposed floodway is shown outside the limits of the 100-year and 500-
year floodplains. Floodways should not exceed the limits of the 100-year
floodplain. The maps should be revised to correctly show the floodway
within the limits of the 100-year floodplain.
TEL 972 770 1300
FAX 872 239 3820
Kimley-Hor~ Mr. Ken Griffin, P.E., October 26, 1999, Page 2
[]-=rl Aggog.a.og,
The City should evaluate the proposed development for ultimate conditions
before final approval is given. The City should also coordinate the approval of
the Corridor Development Certificate with the Army Corp of Engineers to ensure
all City requirements have been met before final approval is given.
We appreciate the opportunity to be of continued service to the City of Coppell.
lfyou have any questions please do not hesitate to call us at 972/770-1300.
Very truly yours,
KIMLEY-HORN AND ASSOCIATES, INC.
Paul Berg, P.E.
Michelle Evans, E.I.T.
Kimley-Horn 12700 Park Central Dr.
Suite 1800
and Associates. Inc. Dallas, TX 75251
Transmittal
Date: October 28, 1999
To: City of Coppell
Attn: Ken Griffin
255 Parkway Blvd.
Coppell, TX 75019-4409
RE: Denton Creek
We are sending you [] Attached
[] Shop Drawings
[] Other:
Job. No: 063124003
[] Under separate cover via
[] Prints/Plans [] Samples
TEL 972770 1300
FAX 972 239 3820
the following items:
[] Specifications [] Change Orders
Copies
1
Da~ No.
Description
Conditional Letier of Map Revision on Denton Creek
These are transmitted as checked below:
[] For your use [] Appmved as submitted [] Resubmit
[] As requested [] Approved as noted [] Submit
[] For review and comment [] Returned for corrections [] Return
Remar~
[] Copies for approval
[] Copies for distribution
[] Corrected prints
Copy to: Michelle Evans