DR9306-CS 940128 January 28, 1994
Mr. Wayne Lea
US Army Corps of Engineers
Fort Worth District, SWFOD-R
P.O. Box 17300
Fort Worth, Texas 76102
RE: Request for Jurisdictional Determination for
Proposed Channel Improvements to Stream G-6, Tributary to
Grapevine Creek, Coppel~, Texas
Dear Mr. Lea:
The City of Coppell plans to improve the subject channel in order
to reduce the potential for flooding to the adjacent homes (three
houses are within the 100 year flood plain), an to reduce the
potential for siltation and erosion in the channel.
The improvements will consist of the following four elements which
were recommended in the recent "City-wide Stormwater Management
Study":
1) Increase the capacity of the culvert under Bethel School Road
by adding a 6 x 10 box to the existing structure.
2) Construct a 12' wide concrete pilot channel 300' long
immediately upstream of Bethel School Road. Also construct 4'
high retaining walls on both sides of the pilot channel and
place rock rip-rap along a 50' long existing vertical wall.
3) For a distance of approximately 1400' upstream of the end of
the proposed pilot channel clear debris, and grade and re-
grass the channel.
4) Increase the channel bottom width to 20' for a distance of 30'
downstream of Bethel School Road. Regrade the channel (grade
to drain) downstream to it's confluence with Grapevine Creek,
to provide positive drainage.
Attached is a copy of recent City topography of the area. Please
review and provide a jurisdictional determination. I would like to
accompany your field agent if any trip to the site is planned.
Thank you for your assistance. If you have any questions, required
further information, or to inform me of the date of a scheduled
site visit, please call me at (214) 241-0336.
Sincerely,
O'BRIEN ENGINEERING
cc: Ken Griffin, P.E., City Engineer, Coppell
o'brien engineering p.o. box 334 coppell, texas 75019 phone: (214) 241-0336 fax: {214) 241-0370