DR9201-CS 910719~mmm~ O ~ MACARTHUR BLVD., P.O. BOx 618087 DAU. A~, TEXAS 7~1 L 214/~
O P~ CEN~R ~ 4~ G~S ~, 8UnE ~ ~ST~, ~ ~7 713/8~
S HWC, INC. O 1~ CENT~ ~VD.. P. O. ~X ~7 B~SVI~E, T~ 7~ 512/~11
O 1~ 8UNe~ V~ DeV~ SUITE 110 ~s~a. VI~IN~ ~1 7~/~17~
ARCHITECTS
ENG~N EE RS ¥
PLANNERS
- T R A N S M I T T..A L
GENTLEMEN:
We are enclosing (herewith) (.n~er ~e~a,~ ~o.er) the following items: FILE
REMARKS-
SHWC, INC.
Architects ;r~gineers Plonr~ers
CITY OF COPPELL
P. O. BOX 478
COPPELL, TEXAS 75019 DATE: [PR-O~-ECr'.___
7-/I-qi
I
(214) 462-0022 ATTENTION:
: , - I- ' · -"
ARE SENDING YOU [ el Attached [ ] Under Separate Cover via the followin$ items:
[ ~j'Mark Up Plans [ '~'/'Plans [ ] Prints
[ ] Copy of Minutes [ ] Copy of Letter [ ] Specifications
[ ] ChanSe order [ ]
ARE TRANSMITTED as checked below:
[ ] For Your Use [ ] Approved as Noted
[ ] As Requested [ ] Approved as Submitted
[ ] For. Review & Con--eat [ ] Note & Reply To:
[ ~eturned for Corrections [ ] Note & Forward To:
[ ] Reau~it~Copies for Approval [ ] Submit Copies for Distribution
[ ] Return Corrected Prints [ ~eturn Markup Plans with Corrections
~:~. c(:p~r ~ czr~,~ . ~ ~ ~.c 4 ~-l~oT
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City of Coppell
A~: Ms. Shohre D~d
255 P~kway ~ulev~d
Coppell, Tex~ 75019
Re: Drainage at Pi~e~on Elemen~y
D~ Shohre:
Ayr~ Associat~ h~ b~n ~e ~ul~t for ~e Cop~ll Ind~endent Sch~l Dis~i~ ~r ~e Piton
Elemen~y Sch~l Io~t~ in ~e City of Coppell. Due to ~e ~nc~ for draMage probl~
ouflin~ in a r~ by Albe~ H~ff ~ exist in ~is ~, we have m~ wi~ ~e City stuff in ord~ to
help provide a ~iution to a ~ion of ~e ~nc~.
~r ~t~ction plans have provid~ a drainage sw~e ~ong ~e r~ of ~e homm locat~ on Howell
S~t ~ r~o~end~ in ~e r~. We have ~ extend~ ~is sw~e on sch~l prope~ adjacem to
~e railroad. ~is sw~e drai~ to ~e w~t ~d ~ be util~ to ac~t dr~ge ~om Howell S~t
~d ~ong a new drainage sw~e ~at ~uld be ~tmct~ ~j~ent to ~e rMlro~ tra~.
improvemenB should help ~e drainage proble~ br ~e homm ~ong Howell S~.
If ~e remaining improvemen~ ~e m~e by ~e City of Coppell ~ ouflM~ in our m~k-up exhibit
· e r~mmendatio~ of ~e H~ff r~ would be ac~mplish~.
Ayrm As~ciat~ underst~ds ~e ~ncern of ~e hom~wn~s in ~is ~ ~ h~ work~ wi~
pmi~ to in~r~e ~e ite~ into our proj<t. We have ~ ~rdi~t~ our site dr~ge wi~
engin~r for Sou~wmtem ~ulev~d ~d have d~i~ ~e drai~e system accordingly.
In ~dition ~ the a~ve drainage co~Meratio~, it h~ b~n r~umt~ ~at we ~d a utility ~ement
for ~e water line. We will ~d a twenty (20) f~t utility ~ement to ~e plat for ~is pu~se.
If ~ere ~e ~y addition~ ite~ ~at n~ ~er cl~ification, pl~e ~nm~ us ~ ~n ~ ~ssible.
Yours very truly,
O~ Ayrm/~ ~ssociat~, Inc.
C. Michael Glenn
R,gion~ Vice ~ident
CMG:~
Owen Ayres & Assoc-ates I~c
Engineers / Planners i Scientists / Surveyors
2110 Walnu: H~I' Lane Suite !34 Las Cohnas. Irving. TX 75038. ~2141 570-5577
SC OOg ' r i [ ~LLCT. L I
:
'[2
'" FIGURE VII-3
SITE B
~oo 200 30o ~ BULLOCK ST. AND HOWELL ST.
SCALE IN FEET J~ URAIHAG;' IMPROVEMENTS
B. Bullock and Howell Streets
1. Statement of Problem
The City of Coppell has received several complaints of street and yard flooding
from residents along Bullock and Howell Streets (Figure VII-3). This is an older subdivision
with open drainage along the front of the properties.
2. Summary of Data
Due to the age of this subdivision, grading and storm drainage plans were not
available. Plans for Pinkston Elementary School to thc west of Howell Street also could not
be located. However, this subdivision is reflected on the City's 1985 topographic maps.
Field reconnaissance was made on May 7, 1990 and several residents
wcr~
interviewed. They expressed concern over yard and street flooding. One resident stated that
the water sometimes seeps into the house.
3. Analysis of Existing Conditions
Review of tile City of Coppcll topographic maps show very little topographic
relief, with natural ground slopes of less than 0.5 percent over the majority ot' the
subdivision. In very flat areas such as this, extra care must be taken to maintain all open
drainage adequately. The drainage ditches along Howell are in need of regrading and many
of the driveway culverts arc over 50 percent clogged by dirt and debris. Drainage along thc
St. Louis and Southwestern railroad at thc rear of this subdivision is als() virtually hr)n-
existent.
i Another contributing factor to this drainage problem appears to be the
· construction of the athletic track immediately west of thc Howell Street homes. The existing
school site drainage swale is blocked by this track fill area causing water to pond along thc
rear of these homes. The existing school drainage swale also ponds water at its north end
near the railroad.
4. Proposed Solutions
Thc recommended solutions for tile Bullock Street and Howell Street drainage
problems are shown on Figure VII-3. They consist of the construction of a drainage swale
along the rear of the west side Howell Street lots and along thc railroad. Between Bullock
and Howell Streets an earthen allcy-drainageway should bc constructed. A 5 [out x 5 I'ot)t
special 'Y' inlet connecting into the existing Denton Tap Road drainage system is also
recommended. This inlet could also outfall into the small tributary of Grapevine Creek
located immediately east of Denton Tap Road.
The estimated cost of thcst: drainage improvements is $~30;~0. This cost
includes boring under Denton Tap Road, inlet construclion costs and grading and
hydromulching of the proposed swales. It also assumes th~st city forces would be utilized to
install the two drainage swales. Equipment rental is included. The residents of the
neighborhood should be included in the plan to clean out the existing roadside drainage
ditches. Upon completion of the clean up, city staff should inspect driveway culverts for
positive drainage and integrity. Ultimately, some portion of the drainage for this area could
also be included in the future Southwestern Blvd. storm sewer system.
t