DR9306-CS 950111 January 11, 1995
Ms. Beverly Summers
569 Rocky Branch
Coppell, Texas 75019
RE: Stream G-3
Dear Ms. Summers:
This letter is written as a follow-up to our telephone conversation in which we discussed the
options available for the drainage channel behind your home.
One option discussed was to let the project run its course and be constructed when its number
came up as part of the City-Wide Storm Water Management Study. This project is listed as part
of the Phase 3 implementation as Stream G-3. There are currently ten projects between where
we are today and the Stream G-3 project. The total cost to implement those ten projects is
approximately 1.75 million dollars based on 1991 dollars. As you can see, if we stay with the
outline in the Storm Water Management Study, the City would need to have the funding to
construct the ten projects before we could even address Stream G-3.
The second option discussed was to try to petition Council to redirect funding internally to allow
for the construction of Stream G-3. Per our Storm Water Master Plan, the estimated cost for
this channel is approximately $29,000.
With this letter, I am including information from our City-Wide Storm Water Management Study
which covers the various phases and the written information concerning Stream G-3. For your
information, Stream G-3 is shown as the 4th project on the Phase 3 implementation.
I hope this information has been helpful to you. If you should have any questions or comments
feel free to contact me at 393-1016.
Sincerely,
Michael A. Martin, E.I.T.
Graduate Engineer
cc: Jim Witt, City Manager
file/kgriffin/wodrdge.ltr
*~ drains the northern most part of the Shadow Ridge Estates Subdivision. A concrete pilot channel (5 foot wide
with curb) extends from Bethel School Road north to a point about 300 feet downstream of the storm sewer
Two other storm sewer outfalis from the same subdivision occur upstream of Bethel School Road.
storm drains connect via concrete flumes to the small concrete pilot chanoeL The area north and east
of I Ridge Estates development is presently undeveloped. The runoff from this undeveloped area
flows channel behind 2~2 Plantation Drive. The channel is prim ~arily grass lined in this area with
scattered on the higher bank~.
of Bethel School Road the chann~ol"is wooded, meandering, and has many
changes in cross: About haft way from Bethel Road to the confluence with Grapevine
Creek, a tributary (Stream the west flows G2. Downstream of this confluence the
channel has been realigned ' the widening of Denton Tap Road. At one point
the channel becomes the greatest.
However, the remaining portion of the is overlpown and there are many fitllen trees near the
confluence with Grapevine Creek.
The only recorded dra~e leal with erosion of the channel banl~
~T/~. emsi.on is primarily on the eas/~de where runoff from ;loped land enters the chalme. L When
area is developed, a storm/~*wer system will probably be d and adequate pro!~_,x~Jon should be
provided as part of this futur~levelopment. However, in th. ~ ir t~e runoff flows over the clmnne, l bani~
I~.d is eroding the bank ~v'it enters the channeL The most ec fl~aJtl~ort term solution is grouted roc~
nprap from the top of/l~nk to the concrete pilot channel for a distance of~ feet. The estimated co~t ~or
t zon r Cooo. rock r vraV could be for an estimator
~ ..~ In ~dditfon, some erosion is ocmarr~ aronnd th, ~torm scour o~tf~ll~
.r~o~ eso~on ~ontrol tbe outfall~ ~hould be r~d. and croton control inclnd~l in tl~
.~on~_ part of a ~ndar city-wide cr~k i~pection and maintenance program to ~m'~
t:ontrol reamins fnnctioning, ~ d~igned to eliminate futul~ ~ti~n complaints.
Stream G~ is a tn'but~ of GralX-.rin~ ~it which flow~ app~tely 1500
southerly dir~on betw~n .~a'bor Brook and Lea Yall~ I.anes. A ~8-inch diameter ~torm ~ pipe from
thc upstream portion of the watershed outfall~ at tl~ beoinninl[ of thc str~.~l~ M~ Ro~
the -~tream'~ l~th approximately 400 feet upstream of its confluence with (3ra~¢ Cr~k.
Several feac~ o'o~ the stream's path upstream of Meadowcreek Road. The o~
of the strea~ is primarily well maiqtaii~ed ba~kyards with deBse to moderate tree areas. Dense trees are found
downstream of Meadowcreek Road as the stream eaters the Grapevine Creek flood plain.
A review of the 100-year flood plain on Stream (33 found no flooded structures.
floor elevations were obtained from the plat of the Northlake Woodlands Addition, dated May 1974.
However, there is frequent nuisance flooding of several backyards upstream of Meadowcreek Road. Thin
flooding, coupled with the overtopping of Meadowcreek Road by the 100-year flood (fully developed
watershed), precipitated the design of culvert improvements. These improvements involve removing the
existing 60 inch pipe and installing one 6 x 5 foot box culvert at an estimated cost of $29,000. The propor~]
improvements will remove Meadowcreek Road from the 100-year flood plain and will si~nificantly reduce the
frequent flooding of thc backyards. The 2- and 100-year flood plains with this improvement are shown on
Plate 3-4, Appendix F in red. _.~
5. Stream G4 and Stream O4A
Stream 04 is in the eastern portion of thc City and flows in a southerly
from of origin at Willow Springs Road to ils confluence with Orapevine Creek
Triple 30 inch diameter storm sawer pipes discharge into the stream at
fnce of WHlow Road. The stream has a six foot wide concrete pilot C.~nnnel with 4:1
f~om Willow to Woodhurst Drive. A park and lake nrea e~sls between and
Bethel School Road. water surface elevation in the lake is 496 feet msL is impounded in
the lake by a dam 240 feet upstream of Bethel School Ro~L water runoff
overflows into two foot inlets which connect to double 36 inch __ storm sewer pipm
outfnlBng downstream of the
Stremn O4A is a , of Stream 04 and flows in a , direction approximately
900 f~et fi'om its point of origin at School Road, crossing Drive before joining Summ
04, TI~ stream rench between Road and Rolling Drive consists of well maintained
bndv/an~ with moderate tree stands in the In addition of u~es exist in the channel with~
tl~ ~ Of Summ O4A. Downstrmm Hals strea~n is straight and clean ~
.~ The 100-year flood plain was t O4A and no hooded s~ we~ f0und
to ~. Rollt~ Hills Drive is overtopped during flood but is not a severe hnzard- ~
no hn.n~m~ements niong Stremn O4A part of this study.
'l'ne tenth Of Strenm 04 nnd of the confluence with Stream 04A is
and moderate to dense tree stands exist 'and in the stream. :8 foot box culvert conveys storm
across Meadow~k Road. ~ Meadowcreek Road the ente~ the Orapevine Creek flood
pt~n which is deme with trees and The stream's confluence Orapeviue Creek is approximately
550 f~ downstream of c Road.
A 100-year would not inundate=any residential along Stream 04. All
roadways (Woodhurst School Road, and Meadom:reek the stream would be
overtopped by the TI~ safety of each c~ these crossings was ~and each was found
to have a safety rating than six (Table V-I). Therefore, the improvements af~ ~
address onl~ ~, upstream of Meadowcreek Roa~L of removing
under Meadowcreek. Rond and replacing it with two ~ box
at an estimated These improvements wia remove Meadowcreek I flood
plain, substnntia~ reduce the 2-year flood plain, thereby reducing the ! frequent
flooding of 1 tmckym~ in tim areal The 2- and 100-year flood plains with this improvement on
Plnte 3=4,F in red. In addition, guardrail and flood hazard warning signs are recommended each
of these (see Section D.I. of this chapter). Construction of new fences obstructing the flood 1~
discouraged and problems with e~isting fenoes should be addressed on an individual bnsis.
MATCH PLATE
EXIST.
/ [
TONWOOD BRANCH, 0 z00 40O SOO ~[~ ALBERT H. HALFF ASSOCIATES, INC.
oM PRIOR ST[JOY ~ I BiB ENGINEERS $CENTIST$ pLANNE.S PLATE 3--4 STREA
,SSOCIATES FOR ,~:*LE IN FEET ST R E AM
CONTOLI~ INTERVAL 2 FEET ~]~ JULY 1990
2. Phase 2 Implementation
Phase 2 consists of projecu which may be funded, at least in part by the second sale of bonds
for the fiscal year 1991-1992.
O Stream G6 Bethel School Road; Channel; $170,
(NLWF_.) and Culverts
~.~ Stream C}1 Loch Lar/e C~hannel Improvements $ 31,000}
_ Grapevine Creek Erosion-Unnamed Grap,~ine Creek $ 7,000
Trib at Meadowcreek Dr. .
~ Grapevine Creek ~osion-Unnn~ Cyrapevin¢ Creek $ 83,000
Tn'o Downstrea~ of Meadowcreek Dr.
~ Denton Creek Andrew Brown Park Spillway $ 35,000~
site x) toye street (south) S
SiteD Cozbycircl¢' $ l?,000~
/ . Site t. Moore Road - Austin Property S 28~P
and Town Creek Apartment Flooding
~site I swan I)d~ S 30~00
Section S.2 Fieldcrest Loop
TOTAL PHASE
Parks and Recreation Department
Poss~le cost sharing with property owners
Estimated cost from "Prelimina~ Engineering Study for Drainage Problems on lrteldcrest
Loops by Crinn; Inc. July 14, 1989.
Phases 1 and 2 represent over one million dollars in Improvements to the drainage systems
within the City of CoppelL The mjority of these Pmjeas may be funded with thc previously approved
dl-ainago improvement funds included in the 1990 bond package. However, sources of additional fun_lng
should be pursued by city st_afl- Projects such as Fieldcrest Loop, Kaye Street (south) and Cozby Clrc~ should
be funded at least in part by the property owners with city staff taking thc lead in coordination and
construction supervision. For example, the Cozby Circle drainage improvements on the individual lots could
be funded either by the home owner or by thc developer of the Cooper Road lots while the City funds the
design and construction of the connection into the existing storm sewer inlet on Anderson Avenue. Other
projects, such as, the Sandy Knoll/Woodhurst subgrade failure and the Andrew Brown Park Spillway should
be funded under street repair and Parks and Recreation funds, respectively.
3. Phase 3 Implementation
Phase 3 consists of projects which have a high priority but may require additional public or
private funding
~ Gtal~6U¢ C~eek Etosion- D~nton Tap Road to Moore Road
-' ~> sueam 03 M~~ Road ~mpms, m~s $ 29,ooo
Stream (34 Meadow~e~k Road Improvements $ 53,000
p Lane - Stage I $ 49,000
Sim
Maplelcaf
Stream G6 Moore Rd. Erosion Protection $ 230,000
O~W~)
Stream G5 Eroaion Protection & Grading $ 7,000
(carter Rd. & Christi Ln.)
Stream G2 Erosion Protection behind $ 26,000
site ~' Cottonwood-~tates/S,,~mer $ hZ,000
Place Addition
Stream 01 l~e~po, n Parkway/i~thel Road $ 69,000~
Intenection (Coppeil Commerce Center)
Cottonwood Branch Andrew Brown Park Berm $ 35,000a
Site E Golden TtiangicMobile Home Paxk $ 90,000~
TOTAL PHASE 3
~ Possible cost sharing with property owners, develo~ and builder.
Parks and fundin~
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