DR9604-CS 960610 \ ~:~-,~D\t~.,- --/ ~' ~.,; ,,,~o.9-._ ~'*~rd'~l,, .c~w ' 10 hne 1996
~ % ~ ._ (City of CoppeH O~y) C.o~* ~.~
~troduct o ~ ~~N ~ ~ ~ p~,
~e floodpl~ of Denton Cr~k, a ~bu~ to the E~ Fork of the T~ty ~ver, ~ the Copper
city ~mits, is locat~ wit~ a develop~g metropoH~ ~. Urb~ exp~sion has result~ ~
~terations to the na~l feamws. Dung the ~ly 1980's, economic conditions 1~ developers ~d the
City of Coppell to s~k use of Denton Creek and it's floodpl~. Adjacent l~ds to the cr~ks have
b~n or are continu~ W be develop~ by p~vate ~terests for hous~g ~d commerci~ development,
~clud~g utility rouWs, ~i~oads, and ~spo~tion co~dors.
The city of Coppell has been an active participant in the Upper Trinity Studies, including
agreeing to implement the Corridor Development Certificate Program. This program is directed at
protection of the floodplain' s values of flood water storage with associated ground water recharge and
water quality improvement, erosion prevention, fish and wildlife habitat, urban open space and
recreation. Widespread community recognition prevails in maintaining these values in a growing
urbanized area.
Proposed Study
Proposed studies for this area would focus on analyzing environmental restoration, wetland
restoration/preservation, streambank erosion, and associated recreation opportunities and needs.
Potential restoration projects would be possible between the edge of the recreation facilities and private
residences and the south and undeveloped land (zoned for residential) on the north. These possible
restoration activities along the modified portion of Denton Creek could include: 108 acres of riparian
forest stand improvement and development with shrubs and vines; and 27 acres of wetland/shallow
water/moist soil/mud flats. Other riparian restoration further downstream between Denton Creek and
the Elm Fork of the Trinity River. Additionally, as a part of the restoration investigation consideration
would be given to incorporate pedestrian/bicycle access across the creek to allow utilization of the
restoration area as an education tool by area schools. Streambank erosion problems would be addressed
by diversion of high flows through a by-pass channel to new wetlands.
For the purpose of this study, projects within Coppell will be located within an area starting west of
Denton Tap Road, proceeding eastward along the north side of Denton Creek for approximately 3 miles
and then the area between the natural Denton Creek channel and the Elm Fork of the Trinity River down to
the Sandy Lake Bridge. The linear area (along the modified Denton Creek) would have an approximate
width of 450 feet through the majority of the study area. Downstream of a channelized (permitted) reach
of the creek, the study area would investigate environmental restoration, on each side of the natural creek,
by-pass channels, and undeveloped floodplain. Immediately south of Denton Creek are existing city
recreation facilities. Portions of these facilities could be used for restoration along Denton Creek. The
study area is shown on the attached map.
Summary. of Cost Estimate: See Table 1 for more details on the cost estimate.
TABLE 1
DRAFT STUDY COST ESTIMATE SUMMARY
FOR CITY OF COPPELLPROJECTS
(without Carrollton)
Federal Non-Federal
Total
Hydrologic/Hydraulic Studies
Civil/Structural Design
Cost Engineering
Geotechnical Studies
Hazardous and Toxic Wastes
Surveys
Environmental Studies
U.S. Fish and Wildlife Service
Cultural Resource Studies
Geographical Information System
Economic Studies
Recreation Studies
Real Estate Studies
Study Management
Plan Formulation
Programs and Project Management
General Engineering
Report Preparation
Public Involvement
Review Contingency
35,000 0
40,000 0
20,000 0
25,000 0
30,000 0
0 5,000
30,000 0
20,000 0
20,000 0
10,000 5,000
20,000 0
25,000 5,000
25,000 5,000
40,000 25,000
5,000 5,000
25,000 0
20,000 0
10,000 0
5,000 15,000
15,000 5,000
35,000
40,000
20,000
25,000
30,000
5,000
30,000
20,000
20,000
15,000
20,000
30,000
30,000
65,000
10,000
25,000
20,000
10,000
20,000
20,000
SUBTOTAL
CASH CONTRIBUTION
AND/OR IN-KIND
TOTAL STUDY COST
$ 430,000 $70,000 $ 500,000
(180,000) 180,000
$ 250,000 $ 250,000
$ 500,000