Villages C P3&4-SY 911230DON A. TIPTON~ INC.
CONSULTING ENGINEERS
ELM FORK( TRINITY RIVER
AND
-- DENTON CREEK
CITY OF COPPELL
DALLAS COUNTY, TEXAS
FLOODPLAIN RECLAMATION STUDY
VILLAGES OF COPPELL PHASES 3 & 4
REQUEST FOR CONDITIONATIONAL LOMR
Pl~:PAR~D BY:
DON A. TIPTON~ INC.
6330 Belt Line Rd., Suite C
__ Garland, Texas 75043
214-226-2967
PREPARED FOR:
GRAND/LAKES OF COPPELL III
8800 N. Central Expwy, #330
_ Dallas, Texas 75231
214-750-6528
3344.fld/wp10
THIS RECLAMATION STUDY IS BASED ON THE CITY OF COPPELL ADOPTED
REGULATORY FLOODWAY,.WHICH IS BASED ON THE PRINCIPLE THAT THE AREA
CHOSEN FOR THE REGULATORY FLOODWAY MUST BE DESIGNED TO CARRY THE
WATERS OF THE BASED FLOOD, WITHOUT INCREASING THE WATER ELEVATION
OF THAT FLOOD MORE THAN ONE FOOT AT ANY POINT.
TABLE OF CONTENTS
A. INTRODUCTION
B. METHODOLOGY
C. 404 PERMIT LETTER
D. WATER SURFACE PROFILES - DENTON CREEK
E. WATER SURFACE PROFILES - ELM FORK
F. CONCLUSIONS
G. HEC-2 MODELS
H. EXHIBITS
VILLAGES OF COPPELL PHASES 3 & 4
A. INTRODUCTION
The 40.98 acre tract located on the East side of Lake Forest
Drive, South of Deforest Road and Denton Creek, and West of Elm
Fork Trinity River is being developed into single family
residential lots (see Exhibit "B"). This reclamation study
presents the results of the proposed fill along the North property
line adjacent to Deforest Road and the East property line adjacent
to the Elm Fork, as shown on Exhibit "B".
ELM FORK TRINITY RIVER
AND
-- DENTON CREEK
VILLAGES OF COPPELL PHASES 3 & 4
B. METHODOLOGY
The hydraulic parameters for this project are the same as the
current effective City of Coppell HEC-2 Computer Model for Denton
_ Creek and Elm Fork Trinity River. These models were obtained from
the City Engineering Department Floodplain Management Section. The
Ultimate 2-Year and 100-Year discharges and starting water surface
elevations were included in this data. The water surface
elevations shown for Denton Creek are Based onthe existing water
-- surface elevations of the Elm Fork Trinity River.
-.~ C. 404 PERMIT LETTER
DEPARTMENT OF THE ARMY
FORT WORTH DISTRICT, CORPS OF ENGINEERS
P.O. BOX 17300
FORT WORTH, TEXAS 76102-0300
REPLY TO
ATTENTION OF: December 30, 1991
Operations Divis ion
Office Operations Branch
SUBJECT: Project Number 199100515
Robert Porter
Don A.' Tipton, Inc.
Consulting Engineers ~
6330 Belt Line Road, Suite C
Garland, Texas 75043
Dear Mr. Porter:
Thank you for your correspondence of November 15, 1991,
concerning a proposal by Grand Homes to develop a residential
subdivision known as th~ Villages of Coppell, Phases 3 & 4, south
of Deforest Road and west of Denton Creek in the city.of Coppell,
Dallas County, Texas. This project has been assigned Project
Number 199100515. Please include the project number in all
future correspondence concerning this project. Failure to
reference the project number on future correspondence may result
in delay. Please note that we previously addressed the area for
which this project is proposed as Project Number 198503050.
We have reviewed this project in accordance with Section 404
of the Clean Water Act and Section 10 of the Rivers and Harbors
Act of 1899. Under Section 404, the U.S. Army Corps of Engineers
regulates the discharge of dredged and fill material into waters
of the United States, including wetlands. The Corps
responsibility under Section 10 is to regulate any work in, or
affecting, navigable waters of the United States. Based on
your description of the proposed work, and other information
available to us, we have determined that this project will not
involve any of the above activities. Therefore, it will not
require Department of the Army authorization.
Thank you for your interest in our nation's water resources.
Please continue to check with us prior to initiating construction
in, or affecting, waters of the United States. If you have any
-2-
questions concerning our regulatory program, please contact
Mr. Presley Hatcher at the address above or telephone
(817)334-3990.
Sincerely,
Copies Furnished:
Ms. Shohre Daneshmand
Engineering Department
City of Coppell
255 Parkway Boulevard
Coppell, Texas 75019
Mr. Rollin MacRae
Texas Parks and Wildlife Department
4200 Smith School Road
Austin, Texas 78444
Mr. Robert
U.S. Fish and Wildlife Service
Ecological Services
Stadium Centre Building
711 Stadium Drive East, Suite 252
Arlington, Texas 76011
Mr. Norm Thomas
U.S. Environmental protection Agency, Region 6
1445 Ross Avenue
Dallas, Texas 75202
ELM FORK TRINITY RIVER
._ AND
DENTON CREEK
VILLAGES OF COPPELL PHASES 3 & 4
D. WATER SURFACE PROFILES - DENTON CREEK
The City of Coppell Floodplain Criteria requires that any new
construction be built using ultimate watershed development to
establish minimum fill and finish floor elevations. The computer
models used in this study utilize this ultimate discharge to
determine the resultant water surface elevations. Following is a
summary table comparing the existing lO0-year and proposed lO0-year
water surface elevations , velocities, and storage volume for FIS
"Q"-iO0 and Ultimate "Q"-100.
DENTON CREEK
F!S "Q" - 100
SUMMARY TABLE
CROSS FIS WATER SURFACE ELEVATION VELOCITIES ' STORAGE VOLUME
SECTION "Q' ...........................................................................
NUMBER EXISTING PROPOSED EXISTING PROPOSED EXISTING PROPOSED
18440 20600 452.12 , 452.12 2.77 2.77 0.00 0.0D
19930 20600 452.24 452.24 1.93 1.93 192.82 192.82
19930 20600 452.25 452.28 2.82 2.82 389.30 389.30
2~560 20600 452.39 452.39 4.11 4.11 i
633.09
633.09
22370 20600 452.58 452.58 4.51 4.51 721.84 721.84
23800 20600 452.98 452.98 2.54 2.54 845.55 845.55
24700 28600 453.45 453.45 3.81 3.81 928.97 928.97
ULTIMATE 'Q' - 100
SUMMARY TABLE
CROSS ULTIMATE WATER SURFACE ELEVATION ! WITH FLOODWAY CHANNEL VELOCITIES STORAGE VOLUME
SECTION "Q" .... ' ...................................................................... { .........................
NUMBER EXISTING PROPOSED EXISTING PROPOSED EXISTING PROPOSED EXISTING PROPOSED
18440 23083 452.38 452.38 452.10 i 452.10 2.85 2.85 0.00 0.00
19930 23083 452.51 452.51 452.20 {
452.20
2.07
2.07
203.96
200.85
.................................... I }!!:!g{ }!!:!g !:g} !:![ ' 409.80 1
................................................................... 663.74 661.52
21560 23083 452.68 452.68 452.40 { 452.40 4.51 4.51 .........................
22370 23083 452.90 452.90 452.60 452.60 4.94 4.94 755.16 753.02
23800 23083 453.39 453.39 453.00 453.00 i I
453.50 453.50l{ 4.08 4.08 {{ 974.47 972.60
24700
23083
453.91
453.91
ELM FOR TRINITY RIVER
DENTON CREEK
VILLAGES OF COPPET.L PHASES 3 & 4
E. WATER SURFACE PROFILES - ELM FORK
The City of Coppell Floodplain Criteria requires that any new
construction be built using ultimate watershed development to
establish minimum fill and finish floor elevations. The computer
models used in this study utilize this ultimate discharge to
determine the resultant water surface elevations. Following is a
summary table comparing the existing 100-year and proposed 100-year
water surface elevations, velocities, and storage volume for F.I.S.
"Q"-100. and Ultimate "Q"-IO0.
SUMMARY TABLE - ELM FORK TRINITY RIVER (F.I.S. 'D')
CROSS : FIS I WATER SURFACE ELEVATION I CHANNEL VELOCITIES ~ SIORABE VOLUME ,
SECTION I '~' : ......................... ) ......................... : .........................
-- NUMBER : I EXISTING I PROPOSED I EXISTING I PROPOSED I EXISTING I PROPOSED
100040 : 48600 I 447.06 I 447.06 ~ 2.63 ) 2.63 J 43i6.10: 4316. i0 l
103060 ) 52800 ) 448.45 : 448.45 : 4.67 i 4.67 ~ 5783.B0 : 5783.B0
*i04BBO : 52800 { 449.98 ) 449.98 ~ 4.16 ) 4.16 ) 6238.50 , 6238.00 1
*105000 : 52800 : 450.18 : 450.18 ) 4.00 : 4.01 : 6296.30 ) 6295.70
,10~00 451.00 451.00 3.51 3.52 6623.90 6622.B0
106080 ~ ~7400 ~ 451.39 I 451,39 ~ 2.93 ) ~.% ~ 6B41.~0 I 68~0,10
110580 : 37400 I 452.53 ) 452.53 : 1.63 I 1.63 I 9495.40 ) 9495.10
110720 I 37400 I 452.55 I 452.55 : 2.11 ) 2.11 I 9612.10 ~ 9611.80
~ , x ~ ' 4~ ~6 I 452.56 I 2.10 2.10 I 9634.10 ) 9633.90 l
110,50 , v74C0 , .2.
- I 110790 : 37400 : 452.50 I 452.50 ) 4,18 I 4.18 : 9654.10 I 9653.90:
*ADDED SECTIONS
SUMMARY TABLE - ELM FORK TRINITY RIVER (ULTIMATE 'g')
CROSS : ULTIMATE ) WATER SURFACE ELEVATION : CHANNEL VELOCITIES I STORAGE VOLUME
SECTION : 'g' ) ......................... '--
-- NUMBER : ) EXISTING : PROPOSED : EXISTING I PROPOSED I EXISTINB : PROPOSED
e 100040 I 55000 : 447.52 ) 447.52 I 2.67 I 2.67 I 4762.10 : 4762.10
103060 : ~1100 I 440.87 I 448.87 : 4.67 : 4.67 I ~392.00 : 6392.00
*I04880 : 61100 I 450.39 ) 450.39 I 4.35 I 4.35 I 6901.B0 I 6901.10
-- _ ................................. I )
*105000 i 61100 I 450.61 I 450.61 I 4.19 I 4.19 I 6966.10 ) 6966.30
-- *105500 I 61100 ) 451.47 ) 451.47 I 3.62 ~ 3.63 ) 7329.50 I 7328.20
106080 ) 43000 I 451.86 I 451.86 I 2.95 I 2.94 I 7570.90 I 7569.50
110580 I 43000 : 453,01 ) 453.01 I 1.70 ) 1.70 : 10470.30 ) 10469.90
110720 ~ 43000 ; 453.03 : 453.03 ; 2.17 ) 2,17 I 10598,10 : 10597,70
110750 I 43000 I 453.04 I 453.04 I 2.17 : 2.17 : 10622.50 I 10622.10
.... 110790 I 43000 I 452.97 : 452.97 I 4.54 I 4.54 I 10644.30 I 10643.90
*ADDED SECTIONS
-- ELM FORK TRINITY RIVER
AND
_ DENTON CREEK
VILLAGES OF COPPELL PHASES 3 & 4
F. CONCLUSIONS
The 40.98 acre tract known as Villages of Coppell Phases 3 & 4
will be developed into a Planned Development consisting of single
family lots. The fill will be placed on Lots 8 through 46, Block
A, in Villages of Coppell Phase 3 and on Lot 37, Block A, in
Villages of Coppell Phase 4, as shown on Exhibits "A" & "B". This
report shows that no negative effects are created for properties
upstream, through, or downstream of the development.
ELM FORK TRINITY RIVER
AND
DENTON CREEK
VILLAGES OF COPPELL PHASES 3 & 4
G. HEC-2 MODELS
Computer runs are attached that demonstrate compliance with the
City of Coppell criteria as follows:
-- I. DENTON CREEK
A. F.I.S. Existing Conditions Duplication
1. 100-Year National Profile
-- 2. 100-Year Floodway Existing FEMA
3. 2-Year Ultimate
4. 100-Year Ultimate
_ B. Existing Conditions Updated From 1991 City Management
Study
1. 100-Year National Profile
2. 100-Year Floodway Existing FEMA
-- 3. 2-Year Ultimate
4. 100-Year Ultimate
C. Proposed Reclamation Conditions
1. 100-Year Natural Profile
2. 100-Year Floodway
3. 2-Year Ultimate
4. 100-Year Ultimate
-- D. Multiple Profiles with Existing Conditions
1. 10-Year FEMA
2. 50-Year FEMA
3. 100-Year FEMA
-- 4. 500-Year FEMA
E. Multiple Profiles With Existing Conditions Updated From
1991 City Management Study
~ 1. 10-Year FEMA
2. 50-Year FEMA
3. 100-Year FEMA
4. 500-Year FEMA
- F. Multiple Profiles With Proposed Reclamation
1. 10-Year FEMA
2. 50-Year FEMA
3. 100-Year FEMA
4. 500-Year FEMA
5. 2-Year Ultimate
6. 100-Year Ultimate
II. ELM FORK
A. Existing Conditions
1. 2-Year Ultimate
2. 100-Year Ultimate
3. Standard Project Flood
.-- B. Existing Conditions with Added Sections
1. 2-Year Ultimate
2. 100-Year Ultimate
3. Standard Project Flood
C. Proposed Reclamation Conditions
1. 2-Year Ultimate
2. 100-Year Ultimate
3. Standard Project Flood
D. Multiple Profiles With Existing Conditions
1. 2-Year Ultimate
2. 100-Year Ultimate
-- 3. Standard Project Flood
E. Multiple Profiles With Added Sections
1. 2-Year Ultimate
2. 100-Year Ultimate
3. Standard Project Flood
F. Multiple Profiles With Proposed Reclamation
1. 2-Year Ultimate
_ 2. 100-Year Ultimate
3. Standard Project Flood
G. Existing Conditions
1. 2,5,10,25,50,100 & 500 Year Ultimate Discharges
-- H. Existing Conditions With Added Sections
1. 2,5,10,25,50,100 & 500 Year Ultimate Discharges
I. Proposed Reclamation Conditions
_ 1. 2,5,10,25,50,100 & 500 Year Ultimate Discharges
DENTON CREEK
IA.
F. I. S. EXISTING CONDITIONS DUPLICATION
DENTON CREEK
IB.
EXI STING CONDITIONS UPDATED FROM 1991
C ITY MANAGEMENT STUDY
DENTON CREEK
IC.
PROPOSED RECLAMAT I ON-
DENTON CREEK
-- ID.
MULTI PLE PROFI LES WITH
_ EXISTING CONDITIONS
DENTON CREEK
IF.
MULTIPLE PROFILES WITH PROPOSED
RECLAMATION
ELM FORK
I IA.
EXISTING CONDITIONS
-- ELM FORK
IIB.
-- EXISTING CONDITIONS WITH ADDED SECTIONS SECTIONS
ELM FORK
IIC.
PROPOSED .RECLAMATION
-- ELM FORK
IID .
MULTIPLE PROFILES WITH EXISTING
CONDITIONS
-- ELM FORK
IIE.
MULTIPLE PROFILES WITH ADDED S'ECTIONS
ELM FORK
IIF -
MULTIPLE PROFILES WITH PROPOSED
RECLAMAT I ON
G. EXISTING CONDITIONS
_ ( ULTIMATE "Q" )
H . EXISTING CONDITIONS WITH
ADDED SECTIONS
( ULTIMATE "Q" )
I . PROPOSED ~ RECLAMATION
-- CONDITIONS
( ULTIMATE "Q" )
W
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100 YEAR WATER SURFACE 452.12 PROPOSED FILL
Lo
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80.00 120.00 160.00 200.00 240.00 280.00 320.00 360.00 400.00 440 . CO 480.00 320,00 560.00 600.00 640.00 680.00 720.00 760.00 800.00
SECTTOf 18 44/11 0 *
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80.00 120.00 160.00 200. 240.00 280.00 320.00 360.00 400 .00 440.00 480.00 520.00 560.00 600.00 640.00 680 00 720. 760.00 800.00 840.00
(SECTION 19330 *10'
co
PROPOSED FILL
CL
452.12
PROPOSED WALL
1"-50'H 1"-5V
o.
Lo
6500 6550
SECTION 18440
cD
PROPOSED FILL
52.24
V PROPOSED WALL
1"-50'H 1"-5'V
k6
v 660 6900 6950
Nt
SECTION 19330
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100 YEAR WATER S
SURFACE 452.25
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'80.00 1
640.00 680.00 720.00 760.00
120:00 160.00 200, 240,00 280. 320.00 360.00 400.00 440.00 4
480.00 5
520.00 5
560.00 600.00 6
SECTION 19930 *10
CD
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100 YEAR W
WATER SURFACE 4
452.39
CD
EXHIBIT 1 "C"
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100 YEAR WATER SURFACE - 448.45
=01111 I mof
160 .00 200.00 240 .00 280.00 320.00 360.00 400 .00 440 .00 480 .00 520.00 560.00 660.00 640 .00 680.00 720,00 7 800.00 $40 .00 880.00
SECTION 103060 *10'
I I
920.00 960.00
0
0
4i
U)
It
PROPOSED FILL
0 PROPOSED GABION SLOPE PROTECTION
0
120.00
U)
100 YEAR WATER SURFACE 449.98
0
O
'4*
0 SECTION 104880
9 Scale: 1'-50'H I'-5'V
r to ----
I Co
160 .00 200 . 00 240 .00 280.00 320 . 00 360-00 40 . 00 4 4'80 . 00 5' *
20 . 00 560 .0 0 600 . 00 640 . 00 680 .00 720.00 760-00 800 . 00 840 . 00 880.00 920 . 00 "t8750.00 8800.00 8850.00 8900.00 8950.00 9000.00
SECTION 104880 10
ADDED SECTION 0
0
t6
U')
It
0
ci
tr
0
100 YEAR WATER SURFACE - 450.18 U 0
i
ci
120.00 160.00 200.00 240.00 280.00 320.00 360.00 400 440 .00 480 .00 520.00 560.00 600.00 64 0.00 680.00 720.00 760.00 800.00 840 .00 880.00 920 . 00
SECTION 105000 *10
ADDED SECTION
100 YEAR WATER SURFACE - 451.00
Kol
0
0
Ui
8tou.uu bbuu.00 8850.00 8900.00 8950.00 9000.00 9050.00
0
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120.00 160.00 200.00 240.00 280.00 320.00 360.00 400.00 440 .00 480.00 520.00 560.00 600.00 640.00 680.00 720.00 760.00 800.00 840.00 880.00 920.00 960 - 00 .t 8550-00 8600.00 8650.00 8700.00 8750.00 8 1 800.00 8850.00
SECTION 105500 *10'
ADDED SECTION EXHIBIT "C"
CROSS SECTIONS
WLLA GES OF COPPELL PHA SE 3&4
City Of Coppell , Texas
DON A. 'flPTON, INC. CONSUL11NG ENGINEERS
6330 Belt Line Rd. - Suite C Garland, Texas 75043
ELM FORK TRINITY RIVER DESIGN DRA VN DATE SCALE NOTES FILE NO,
d. a. t. d. a. t. 1/91 3344
1000-00 1040.00 1680.00
ELM FORK TRINITY RIVER
DENTON CREEK
VILLAGES OF COPPELL PHASES 3 & 4
_ H. EXHIBITS
EXHIBIT "A" VICINITY MAP
EXHIBIT "B" RECLAMATION PLAN
EXHIBIT "C" CROSS SECTIONS
EXHIBIT "D" WATER SURFACE PROFILES
-- EXHIBIT "E" CITY LIMITS MAP
EXHIBIT "F" FIRM MAP