Stratford Manor-CS 971114 f~,/, "~ P.O. Box 478
Coppell, Texas 750~ 9
The City With A Beautiful Future 214-462-0022
November 14, 1997
Ms. Tracy Garman
707 Cambridge Manor
Coppell, Texas 75019
Re: Revised Floodplain along Denton Creek / Stratford Manor Subdivision
Dear Ms. Garman:
During our conversation on November 13, 1997, you expressed interest in the revisions to the
floodplain along Denton Creek east of MacArthur Blvd. and north of DeForest Road. As I
stated, the floodplain in this area was revised by the Federal Emergency Management Agency
(FEMA) on July 23, 1997. In essence, this revision removes most of the land east of
MacArthur up to the east side of Cambridge Manor Estates from the floodplain. Just because
the land has been removed from the floodplain does not necessarily negate the need to fill
portions of the land. In many instances, development adjacent to creeks or in reclaimed areas
has a minimum finish floor elevation driven more by the flow line of the sewers as opposed to
the required elevations based on the floodplain. Until such time as construction plans have been
submitted, the City is not in a position to determine how much fill will be placed on the property
when it is developed.
You also stated that it had come to your attention that some of the lots in the proposed Stratford
Manor Subdivision have been sold. While that did not completely surprise me, I stated that
there has been no construction plans submitted to the City on this project nor any interaction
between the developer of this project and the City of Coppell's Engineering Department in over
three months.
Included with this letter is the information provided from FEMA concerning the removal of the
referenced area from the floodplain.
If you should have any questions or need any clarification on reviewing the enclosed data please
feel free to contact this office at your convenience.
Sincerely,
· G iffin, P.E.
Director of Engineering and Public Works file/floodplain/garmenll.97
e F i!'-Emergency Management Agency
Washington, D.C. 20472
CERTIFIED MAIL IN REPLY REFER TO:
RETURN RECEIPT REQUESTED Case No.: 97-06-503P
The Honorable Candy Sheehan Community: City of Coppell, Texas
Mayor, City of Coppell Community No.: 480170
255 Parkway Boulevard Panel Affected: 0010 E
Coppell, Texas 75019 Effective Date of
This Revision:
102-I-A-C
Dear Mayor Sheehan:
This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective
Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FI S) report for your community in accordance
with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated May 6, 1997,
Ms. Sabine Borgnet-Harris, Halff Associates, Inc., requested that FEMA revise the FIRM and FIS report to
show the effects of corrections to the effective hydraulic analysis and effective FIRM and FIS report along
Denton Creek from just downstream of the convergence to approximately 1,450 feet upstream of the
divergence of Old Denton Creek and along Old Denton Creek from its convergence with to its divergence
from Denton Creek. The corrections made as part of this revision are listed below.
· The effective hydraulic analysis shows Denton Creek and Old Denton Creek share a common
floodplain. This study is incorrect because high ground separates Denton Creek from Old Denton
Creek so that each stream has its own floodplain. As part of this revision, the effective hydraulic
analysis was separated so that each stream has its own hydraulic analysis.
· The effective floodway analyses for Denton Creek and Old Denton Creek showed floodway topwidths
that were greater than the topwidths of the floodplain of the flood having a l-percent chance of being
equaled or exceeded in any given year (base flood). The topwidths were corrected as part of this
revision.
· The effective floodway analysis for Old Denton Creek showed floodway topwidths that did not match
those shown on the effective FIIhM. These discrepancies were corrected.
· The cross-sectional distamces shown in the effective hydraulic analyses along the revised reach for both
Denton Creek and Old Denton Creek did not match the distance shown on the effective FIRM and
Flood Profile panels 08P, 09P, and ! I P. These discrepancies were corrected.
· The configuration of Denton Creek and Old Denton Creek in the effective hydraulic analysis did not
match the configuration shown on the effective FIRM. Minor changes were made to the geometry at
Cross Sections 23800, 24400, and 24700 to correct this discrepancy.
All data required to complete our review of this request were submitted with letters from Ms. Harris. Because
this Let~r of Map Revision (LOMR) is being issued to correct a mapping or study analysis error, fees were
not assessed for the review.