ST9401-CS 950221Texas Department of Transportation
RO. BOX3067.DALLAS, TEXAS75221-3067-(214) 320-6100
12000 Greenville Avenue, Dallas, Texas 75243-3506
February 21, 1995
Mr. Ken Griffin, P.E.
City Engineer
City of Coppell
P.O. Box 478
Coppell, Texas 75019
RE:
Control: 3547-02-003, 3547-03-002
Highway: SH 121 Bypass (Phase I)
From SH 121 at Denton Creek
To Denton Tap Road
County: Dallas, Denton
Mr. Ken Griffin:
We are providing your office with a copy of the revised proposed
alignment of Culvert S-5 for the referenced project. This plan
sheet will replace sheets #40 and #67 of the plans adequate sent
to you earlier this month. Currently, the plans adequate depict
a culvert exiting out into a two feet by six feet flume and
cutting across Vista Mortgage Properties. This open drainage
would require a metal beam guard rail for approximately seven
hundred feet along the east side of Denton Tap Road. We feel
that there is a more feasible option.
We would like to propose for your consideration a closed drainage
system along Denton Tap Road from SH 121 Bypass to Denton Creek.
In order for this to occur, it would require your assistance in
providing the necessary design details beyond the end of our
.proposed culvert. In addition, the City of Coppell would be
required to provide the funding to obtain the materials and
construct the length of culvert to the Denton Creek outlet. If
you consider this as a viable option, please submit an official
written request to this office by March 20, 1995, stating that
you would be willing to provide the necessary funds prior to the
letting of the referenced project. The additional culvert length
could then be built with the referenced project.
An Equal Opportunity Employer
Just as a note, we would like to make mention of a thirty inch
water line owned by Dallas Water Utilities (DWU) that is
currently located under the ditch on the east side of Denton Tap
Road. We have intentions of coordinating our efforts in such a
manner that the utility would only have to be designed and moved
once. DWU is currently working with the City of Lewisville as
they are designing Denton Tap Road to the north of the bypass.
For your information, we are providing you with the proposed
discharges of the drainage design. We would appreciate your
reviewal and concurrence at your earliest possible convenience.
Should you have any questions or require further clarification,
please feel free to contact Mr. Kenneth J. Shirley at the above
address or at telephone number (214) 235-7797.
Cordially,
C. Smith Jones, P.E.
Area Engineer
Attachments
PROPOSED DISCHARGES IN THE DENTON TAP ROAD VICINITY
CI-U14
LINE U INLETS AND DISCHARGES
INLET DRAINAGE AREA DISCHARGE (CFS)
CI-U1 U1 3.91
CI-U2 U2 3.03
CI-U3 U3 2.89
CI-U4 U4 2.89
CI-U5 U5 2.89
CI-U6 U6 2.89
CI-U7 U7 2.92
DI'U8 U8 14.06
CI-U9 U9 2.76
CI-U10 U10 2.20
CI-Ull Ull 3.36
CI-U12 U12 1.80
CI-U13 U13 2.62
i 3.26
LINE W INLETS AND DISCHARGES
INLET DRAINAGE AREA DISCHARGE (CFS)
CI-W1 W1 4.35
CI-W2 W2 4.35
DI-W3 W3 16.83
CULVERT S-5 W4 & W5 546.12 (25YR)
LINE X INLETS AND DISCHARGES
INLET DRAINAGE AREA DISCHARGE (CFS)
CI-Xl X1 4.35
CI-X2 X2 4.15
CI-X3 X3 3.51
CI-X4 X4 4.48
DI-X5 X5 7.82
DI-X6 X6 58.28
U14
LINE Y INLETS AND DISCHARGES
INLET DRAINAGE AREA DISCHARGE (CFS)
CI-Y1 Y1 0.43
CI-Y2 Y2 0.93
CI-Y3 Y3 0.93
CI-Y4 Y4 1.30
CI-Y5 Y5 2.91
CI-Y6 Y6 2.36
LINE Z INLETS AND DISCHARGES
INLET DRAINAGE AREA DISCHARGE (CFS)
CI-Zl Z1 4.39
CI-Z2 Z2 3.41
LINE AA INLETS AND DISCHARGES
INLET DRAINAGE AREA DISCHARGE (CFS)
CI-AA1 AA1 2.42
CI-AA2 AA2 1.98
CI-AA3 AA3 3.74
CI-AA4 AA4 2.39
CI-AA5 AA5 2.36
Note: Ail curb inlets and drop inlets are designed on a 5 year
storm interval with a minimum time of concentration of 10 minutes
using Dallas County constants.