Valley R Center-CS 890412GINN, INC.
CONSULTING ENGINEERS
April 12, 1989
Mr. Rus~l~Doyle,
City of/Coppell
P.O. ~x 478
Copp~l, TX 75019
P.E., City Engineer
Re:
Valley Ranch Center
Drainage Map & Construction Plans (Revised)
DRC - Engineering
Dear Mr. Doyle:
We have reviewed the above referenced plans for Valley Ranch
Center and offer the following comments:
We have no objections to the revised drainage areas on this
site along the Belt Line Road (E-W) frontage. The changes
appear to be minor and generally consistent with the
original drainage areas identified in the Belt Line Road (E-
W) project, and thus, should not adversely affect that
design.
We understand from the applicant that the 27" lateral for
drainage area A-2 is currently planned to be tied into the
proposed 8'x5' RCBC by Dallas County under the Belt Line
Road Improvements project, therefore, we have no objections
as it is shown.
We understand that coordination is required between Dallas
County and Dunning Development, Inc. for the removal of the
proposed entrance headwall in drainage area C-2 at the
southeast corner of the Dunning tract. The 18" RCP will
provide drainage for the property immediately east of this
site until the County can have the 10'x6' box culvert
installed.
When the 10'x6' RCBC is installed, it is planned for the
County to cut a swale parallel to the 10'x6' RCBC to drain
the property east of this site to the south. At this time,
in addition to the entrance headwall being removed, the 18"
RCP can be plugged.
17103 Preston Road · Suite 100 · LB 118 · Dallas, Texas 75248 · Phone 214/248-4900
Se
Hydraulic Grade Lines shall be added to the construction
plans. The applicant, Dallas County, the City and Ginn,
Inc. are all aware of the backwater effects that are present
on this site, as it is currently designed, due to the 100
year water surface elevation at the outfall of the Belt Line
Road (E-W) storm sewer system and the associated flooding
that will occur in the parking lot of Valley Ranch Center as
a result.
The 12" waterline in MacArthur Blvd. needs cut and blind
flanged just north of the Grapevine Creek bridge in order to
isolate the City of Irving's water distribution system from
the City of Coppell's system. Applicant should reference
the original construction plans submitted by Albert H. Halff
& Associates, Inc. and approved by the City of Coppell on
December 22, 1987 for the necessary details required.
Upon the above changes being accommodated, we have requested the
applicant to resubmit 3 sets of plans to your office for staff's
further review and advisement to your office regarding status for
approval and construction.
Sincerely,
F
Kevin Peiffe~ P.E
KP/dsp
cc-
Steve Lemke, Dunaway Assoc.
Steve Goram
Bud Beene, P.E., Dallas Co. Public Works
John C. Karlsruher, P.E.
Gabe Favre
File 89305
ALBERT H. HALFF
INC. 'FOR'T'HE IRVING
ROL DISTRICT, SECTION TI'I,
ND G-tS, DATED dULY, 1983.~--'
[mo O~ou
~,,/111,
1.6
8.4
8.4
6.o
11.62..0
2..0
92.1
I0.0
·'
9.8 5.~
11.6 2.L
1.0
I0.0
NOTES: (Typic(~l All Druino(je Sheet',,)
C. KARL3RUHER
~P
Qrml'd': (:¢Jlcuklled tlows ul do~iq, p.inl (Cf~)
Cop. · capucily .t HCP/RC[tC (il ~lopo Indiculed {
Vul.: velocily of HCP/HCHC ut ~lope
St-: friction slope (ft./fl.)
Q- ,ctu,I flow (cfs) ~ ·
V = (ictual velocity (fps)~ b~sod on HGL
HGL =/Hydr(~ulic Grude Ltno (including
Typicul Runoff Computetions ~re ~ed on lbo Rolionul Formul~'~,'~ using Technical Paper 40.
Runoff Computations for area A-15 ~Jnd the ~9" Dia, Cul~
the NW corner of the Belt Line/MucArthur inter~tion
based on the full capacity of the e~lsting pipes ~rving.tho~r~;
Discharge Computations based on
development of ull Druinage Areas contrlbutiog: 1o each.~tor~
sewer system.
BELT LINE
CITY O. Fi COPPEL
DALLAS
DRAINAGE?
~ '. ~z/$~ $9
TO
WE ARE SENDING YOU
[] Prints
[] Copy of letter
RE:
DALLAS. T~ .....
THESE ARE TRANSMITTED ~s checked below: ' ' --
DATE REVIEWF..D
[] Fo,.,~,ov.. a NO oBlmm,s g M,,KE,UF. mm NmB
I-'1 As requested
~'Fo, r......d~o.,.,... [] ~ql~ .., ,~.,ll-%,
REMARKS
If e4cl~m~ are ~g 4~ grated, ki~lly ~/t~gify us ,~ e4ee.
NOTE:
THIS SET OF SITE iMPROVEMENT PLANS IS
' .~ IFICATION OF pLANS PREPARED BY
i
'X ' 111t
1111
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