Magnolia Park-CS071204
THE.CITY.OF
COPPELL
I'
Cl
December 4, 2007
Gary Bailey, P.E.
Area Manager
Texas Dept. of Transportation
12000 N Greenville Ave
Dallas TX 75243-3506
Re: Silt Deposits in Magnolia Park
Dear Mr. Bailey:
For some time now the city has been working with representatives of the Magnolia Park
Homeowners Association in regard to the accumulation of silt within a channel maintained
by the association. It is our understanding that TxDOT has also had conversations with the
HOA group. It is also our understanding that one of the outcomes of a prior meeting was
the installation of baffle blocks at the outfall of the TxDOT box culverts into the BOA
channel.
However, field investigations by the city have revealed several other areas that still need to
be addressed by TxDOT. Those areas are:
1. Removal of the deposited silt currently existing within the TxDOT culverts.
We recently walked up the box culverts taking photographs and noticed a
substantial amount of silt remaining within the box culverts that will
eventually be washed downstream into the Magnolia Park HOA channel.
Removal of that silt will help to alleviate future deposits of silt in the channel.
2. The other item noted was that the erosion protection provided by TxDOT at
the drop inlets on the north side of SH 121 is not functioning property.
Because of this, they continue to allow silt from the upstream property to wash
into the TxDOT drainage system, and carried through the system, and
eventually deposited into the HOA channel.
The city of Coppell would like to see some type of more permanent erosion protection at
the drop inlets that would allow water to pass while preventing the silt from entering the
system. This would prevent the silt from going into the TxDOT drainage system to travel
downstream. The city is well aware that the upstream property is contributing to the
problem, however, the lack of erosion protection at the TxDOT drop inlets continues to
create an unbearable situation for the Magnolia Park HOA.
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I am unsure of what kind ofleverage TxDOT may have with the upstream property owners
with regard to influencing those owners to correct the problems that continue to cause the
erosion that deposits silt in the TxDOT drainage system and ultimately in the Magnolia
Park channel. This issue has been lingering far too long and only a permanent solution at
the upstream end will resolve the problem. The city is also in the process of contacting the
upstream property owners. When you have had a chance to review this situation, I would
appreciate being contacted to discuss where we go from here and what types of solutions
may be available.
Thank you for your time in considering this issue. If you have any questions or need
additional information, please contact me.
Sincerely,
,~~ Ii ~r-
Kenneth M. Griffin, P.E.
Director of Engineering / Public Works
Office: 972/304-3686
Fax: 972/304-7041
kgri ffin@ci.coppell.tx.us
cc: Bryan Thompson, Magnolia Park HOA