Alexander Ct-CS070622Page 1 of 1
Paula Crocker - Fwd: Grapevine Creek/Alexander Court LOMR Review
From:
Ken Griffin
To:
Mike Boyd
Date:
6/22/2007 10:55 AM
Subject:
Fwd: Grapevine Creek/_Alexander n „rt LOMR Review
CC:
Paula Crocker
Attachments:
20070523.pdf
Mike
Could you provide a status update on revisions to the flood study? Plans are in on the project and I
would to make sure that all outstanding items are moving forward.
Thanks
Ken Griffin
>>> Ken Griffin 5/30/2007 12:55 PM >>>
Mike
The review letter from Kimley -Horn for the Alexander flood study is attached.
Please make necessary changes. It probably would be quicker to work directly with K -H.
Ken Griffin, P. E.
Director of Engineering/Public Works
972 - 304 -3686
kgriffnCa.ci.c.. oppel.l....tx.us
>>> <brad.pickering @kimley- horn.com> 5/23/2007 5:01 PM >>>
Ken:
As discussed this afternoon with Nadia Dahab, attached are KHA's comments for the Grapevine Creek LOMR
application for Alexander Court, dated April 26, 2007, prepared by Nathan D. Maier Consulting Engineers, Inc. If
you have any questions regarding the attached comments, please do not hesitate to give us a call.
Thank you,
Brad W. Pickering, EIT (IN), CFM
Kimley -Horn and Associates, Inc.
12700 Park Central Drive, Suite 1800
Dallas, TX 75251
p: (972) 776 -1781
f: (972) 239 -3820
e: brad.pickering @kimley - horn.com
file: //C :1 Documents %20and %20Settings\PCROCKER1 Local %20SettingslTemplXPgrpwis... 6/22/2007
Kimley -Horn
and Associates, Inc.
May 23, 2007
Mr. Kenneth M. Griffin, P.E.
Director of Engineering/Public Works
255 Parkway Boulevard
Coppell, TX 75019
RE: Letter of Map Revision aOMR) Review
Grapevine CreeWAlexander Court
KHA No.: 063124008
Dear Mr. Griffin:
Kimley -Horn and Associates, Inc. (KHA) has performed the first review of the
Grapevine Creek LOMR application for Alexander Court, dated April 26, 2007,
prepared by Nathan D. Maier Consulting Engineers, Inc. (NDMCI).
KHA reviewed the document for adherence to currently published City of
Coppcll and Federal Emergency Management Agency (FEMA) drainage design
guidelines. KHA recommends that NDMCE address the following items:
1. The MT -2 Form 2, page 1 of 2, states that the upstream tie -in of the
study is at cross section 27620. Cross section 27900 has been added to
the revised existing conditions model and is not included in the effective
model. Revise the forms to reflect an effective tie -in upstream of the
model modifications.
2. Revise the Floodplain Work Map to include the benchmarks and vertical
datum used for the on- ground survey.
3. The water surface elevations table in the report text is not consistent with
the modeling output for the effective floodway HEC -RAS model.
Revise the report to be consistent with the modeling output.
4. Revise the Location Map to reflect the boundaries of the LOMB
submittal.
5, Cross section 22600, the location of the downstream effective tie -in, is
not shown on the Floodplain Work Map. Revise the workmap to show
this cross section.
TEL 972 770 1300
FAX 972 239 3920
■
Suite 1800
12700 Pak Central 06ae
Dallas, Texas
75251
Kimley -Horn
and Associates, Inc.
Mr. Kenneth M. Griffin
May 23, 2007
Pugc 2 of 2
6. The sum of reach lengths for the HEG-RAS revised condition model
does not match the sum of the reach lengths in the FEMA effective
model. Revise the reach lengths in the revised condition model or
explain this discrepancy.
7. The report text states that Manning's `n' values were taken from the
effective model, but they vary from the effective model at multiple
locations. Revise the model to be consistent with the effective modeling
or justify the proposed Manning's `n' values.
8. Property owner notification is required by NFIP regulations 65.7(b)(1)
due to the floodway revision. The notices must include the extent of
revision, the changes to the floodway, and contact information for any
interested parties.
9. Revise the legend on the Floodplain Work Map to reflect revised existing
conditions and not proposed conditions.
10. Future development adjacent to the subject reach shall respect both the
100 -year fully developed and FEMA effective floodplain boundaries.
Please note that any future development adjacent to the subject reach will need to
comply with all of the provisions set forth in the ordinances of the City of
Coppell including, but not limited to, the Subdivision Ordinance, Zoning
Ordinance, and FloodpWn Management Ordinance.
If you have any questions regarding the comments included in this letter, please
feel free to contact us at 972.770.1300.
Sincerely,
KIMLEY -HORN AND ASSOCIATES, INC.
Steven D. Galloway, P.E., CFM Brad . ickermg, FIT, CFM
G: HYDROIPROJECTS1631240OMlexander Court120070523.doc
Page 1 of 2
Ken Griffin -Fwd: RE: Denton Creek Bridge Plans
From:
Ken Griffin
To:
Rhonda Adloo
Date:
7/27/2007 11:16 AM
Subject: Fwd: RE: Denton Creek Bridge Plans
Attachments: RE: Denton Creek Bridge Plans; RE: Grapevine Creek/Alexander Court
LOMR Review; RE: Grapevine Creek LOMR Application Approval
Letter; RE: Floodplain Study for Alexander Tract
Ken,
sent a revised study back to K -H that addresses their comments earlier this month (I thought
you had been copied on the transmittal). Brad Pickering has said that they would have the
second review completed by the 26th. Attached is a copy of the transmital letter for your files.
Thanks, Mike Boyd
- - - -- Original Message - - - --
From: Ken Griffin [ mai Ito: kgriffin @ci.coppell.tx.us]
Sent: Friday, June 22, 2007 10:55
To: Mike Boyd
Cc: Paula Crocker
Subject: Fwd: Grapevine Creek /Alexander Court LOMR Review
Mike
Could you provide a status update on revisions to the flood study? Plans are in on
the project and I would to make sure that all outstanding items are moving forward.
Thanks
Ken Griffin
»> Ken Griffin 5/30/2007 12:55 PM »>
Mike
The review letter from Kimley -Horn for the Alexander flood study is attached.
Please make necessary changes. It probably would be quicker to work directly
with K -H.
Ken Griffin, P. E.
Director of Engineering/Public Works
file: HC: \Documents and Settings \radloo \Local Setting s\ Temp \XPgrpwise \46A9D4ODCity_... 2/10/2010
Page 2 of 2
972- 304 -3686
kgriffingci.coppelUx.us
»> <brad.pickering @kimley- horn.com> 5/23/2007 5:01 PM »>
Ken:
As discussed this afternoon with Nadia Dahab, attached are KHA's comments for the
Grapevine Creek LOMR application for Alexander Court, dated April 26, 20077
prepared by Nathan D. Maier Consulting Engineers, Inc. If you have any questions
regarding the attached comments, please do not hesitate to give us a call.
Thank you,
Brad W. Pickering, EIT (IN), CFM
Kimley -Horn and Associates, Inc.
12700 Park Central Drive, Suite 1800
Dallas, TX 75251
p: (972) 776 -1781
f: (972) 239 -3820
e: brad.pickering @kimley- horn.com
file: HC: \Documents and Settings \radloo \Local Setting s\ Temp \XPgrpwise \46A9D40DCity_... 2/10/2010
Page 2 of 2
Engineers, Inc. If you have any questions regarding the attached comments, please do not hesitate to give
us a call.
Thank you,
Brad W. Pickering, EIT (IN), CFM
Kimley -Horn and Associates, Inc.
12700 Park Central Drive, Suite 1800
Dallas, TX 75251
p: (972) 776 -1781
f: (972) 239 -3820
e: brad.pickering @kimley - horn.com
file://C:\Documents and Settings\rbrother\Local Settings \Temp\XPgrpwise \467BBA4CCity... 1/8/2008