Alexander Ct-SY 971113
IY oa.
DOWD~ ANDERSON AND ASSOCIATES, INC. I1lli:Vlr[OO @(f 1rrn~~~~01J1j~!1.
CIVIL ENGINEERS
5225 VILLAGE CREEK DRIVE SUITE 200
PLANO, TEXAS 75093
(972) 93HJ694 FAX (972) 931-9538
DATE r,-
ATTENTION
RE.
TO
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WE ARE SENDING YOU W Attached 0 Under separate cover via
COvY i.e.r
the following items:
o Shop drawings
o Prints
o Plans
;g tpp (f!:"
o Samples
o Specifications
o Copy of letter 0 Change order
DATE NO.
DESCRIPTION
/k,()p~
THESE ARE TRANSMITTED as checked below:
o For approval
o For your use
J4 As requested
~ For review and comment
o FOR BIDS DUE
o Approved as submitted
o Approved as noted
o Returned for corrections
o
o Resubmit_copies for approval
o Submit _copies for distribution
o Return_corrected prints
19__ 0 PRINTS RETURNED AFTER LOAN TO US
REMARKS
pel!-
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COpy TO
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" .rocINU". .,. not .. notH. /rlndly notify U. .t OllC.. ~
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Proposed East Tract - Baptist Foundation Tract
Coppell, Texas
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HYDRAULIC MODELING
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August 31, 1995
Graham Associates
616 six Flags Dr. #400
.l\rlington, Texas
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/'~tf . RECORD DRAWINGS
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NOTE: THE WTCNT OF THE OWNER ~D
ENGINEER WAS TO CONSTll.UCT THE lMPROV;;:
MENT$ ACCORDWG TO THese Pl.AH:i; AS
APPROVED 8V THE CITY OF COPPELL THE
UNE$ AHD GRAoes WERE: SET OH THE GROUND
ACCOflDWG; TO SAlO PL.AHs. THl!: ENGIHEEA IS
NOT AWAItE OF ANY Cl-IAHGES OIl REVISIONS TO
THESE PlANs DURING CONSTRUCTION EXCEPT
~TEO ON THe PLANs
1'(t!$hQ~ b:lsl. Grodt! .;"./)nz'1'l
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BJ:NCIl MARK.
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NOTE
J<< Developu ;s not (~p"n-=-/b/t for "be'n,hlf'~
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to pl,lild pQd a~ '$.how" rJrrl m,,:1f IWlI"fa,r,
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Creek.. Oevelo~r 7b cons,,1t ",If" Cdy e"$i,."
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'5VM.AI\~
100 YEAR WATER SURFACES
(J(',/) ~ov-JL
SEC. NO Duplicate Existing Proposed
Effective
Natural Floodway Natural Floodway Natural Floodway
Lower
27400 494.69 495.34 494.69 495.34 494.69 495.34
27540 494.67 495.57 494.67 495.57 496.67 495.57
27570 494.92 495.68 494.92 495.,68 494.92 495.68
27620 495.61 495.72 495.61 495.72 495.61 495.72
1.0 496.24 496.57 496.24 496.57 496.24 496.57
2.0 496.46 496.80 496.46 496.80 496.46 496.80
2.5 496.61 496.97 496.61 496.97 496.61 496.97
3.0 497.62 497.82 497.62 497.82 497.58 497.82
3.3 499.01 499.14 499.01 499.14 499.01 499.14
3.6 499.36 499.57 499.36 499.57 499.35 499.57
4.0 499.91 500.17 499.91 500.17 499.91 500.12
4.5 501.31 501. 57 501.31 501. 57 501.27 501.45
Main
'>171.,1 4.50 501. 31 501.57 501.31 501. 57 501. 27 501.45
~1.i3 5.00 501. 54 501.90 501.54 501. 90 501. 51 ~73
sl?l,~ 5.10 501.54 501.89 501.54 501.89 501. 52 501."'72-
SO, '\~ 5.11 501.56 501.90 501.56 501.90 501. 53 501.73
5.12 501.56 501. 92 501.56 501.92 501. 53 SOL 75
5.13 501.56 501. 92 501.56 501. 92 501. 53 501. 75
5.14 SOL 56 SOL 91 501.56 501.91 501. 53 501. 74
<:.D',<;" 5.20 501. 56 501. 91 501.56 501. 91 501. 53 501. 74
w' ,'5, 5.21 501. 54 501.88 501.54 501.88 501.51 501. 71
5.22 501. 57 501.94 501. 57 501. 94 501.54 501.77
5.23 501. 57 501.95 SOL 57 501.95 501.54 501.78
5.24 501. 55 501. 91 501.55 501.91 501.52 SOL 74
S:>'.30) 5.30 .501. 45 501. 78 501. 45 501.78 501.42 501.78
~,.oS 6.00 500.93 501.53 500.93 501.53 501.01 501.40 ---
SO~ -1+ 30130 503.72 503.66 503.72 503.66 503.72 503.59
Bypass
SJ,.~ , 4.5 SOL 31 501.57 501.31 50.1. 57 501. 27 501.45
70 501.31 501.49 501.31 501.49 501.13 501.22
76 I 501. 29 501. 61 501.27- 501.50
80 501.33 501. 70 501.34 501.70 501.32 501.56
Soljb 90 501. 57 501.94 501. 58 501. 93 501.56 SOL 87
110 ~., "g!'") 501. 87 502.28 501.88 502.28 501.91- 502.2~
Sol.')\' 6. 0 ~o' ~f 500.93 501. 53 500.94 SOL 53 501. 00 501. 42--
so3.f430130 50'? .,~ 503.72 503.66 503.72 503.66 503.72 503.59
Upper
30130 503.72 503.67 503.72 503.66 503.72 503.59
30189 503.58 503.65 503.58 503.64 503.57 503.58
30190 503.45 503.53 503.45 503.52 503.44 503.45
30200 503.69 503.75 503.69 503.75 503.68 503.68
30201 504.09 504.15 504.09 504.14 504.08 504.09
30250 504.99 504.95 504.99 504.94 504.98 504.89
31310 506.56 506.83 506.56 506.83 506.56 506.80
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Attached are exhibits and computer runs that support a LOMR application to update the
effective FIRM's floodplain and f100dway limits in the reach of Grapevine Creek that
extends from Denton Tad Road to Bethel Road.
Graprevine Creek 100-yr
Water Surface Elevations (ft)
Natural Encroached
HEC-2 HEC-RAS HEC-RAS HEC-2 HEC-RAS HEC-RAS
River Sta. Q Total Duplicate Imported Modified Duplicate Imported Modified
( cfs ) Effective Effective
22600 11800 479.02 479.02 479.02 479.80 479.80 479.80
24000 11800 482.23 483.06
25000 11800 482.88 483.73
25100 11800 483.26 484.06
25370 11800 486.74 486.89 484.51 487.52 487.52 485.06
25470 11800 487.25 487.54 485.66 488.18 488.32 486.04
25485 Denton Tap
25500 11800 488.08 488.43 485.81 488.72 489.00 486.19
25550 11800 488.72 488.4 7 485.44 488.95 485.85
25685 11900 485.51 485.92
25725 11900 485.97 486.31
25820 11900 486.95 487.15
26170 11900 487.02 487.34
26300 11900 487.29 487.6
26700 11900 , 488.05
488.27
26880 11900 491.22 491.33 489.77 489.16 491.81 489.82
27050 10500 490.14 490.33
27400 10500 494.03 494.10 492.83 491.83 494.52 492.83
27540 10500 494.23 494.37 492.16 494.57 494.91 492.16
27555 Bethel Road
27570 10500 494.43 494.68 493.54 495.00 495.13 493.54
27620 10500 494.65 494.70 494.36 495.14 494.90 494.37
27900 10500 496.58 496.59
30130 10500 ! 502.87 503.31 502.59 503.52 503.87 502.60
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27400, Exhibit 4 is a floodplain work map that shows the location of these cross
sections, the effective FIRM, and the proposed 100-yr floodplain and floodway
delineations.
Table 1
Grapevine Creek 100-yr Discharges (cfs)
River Station Q
27620 10500
26880 11 900
25550 11800
III. COMPUTER MODELS
Computer models, input and output are included in this report as attachments under
report Section VII. The description and file names are as follows:
1. HEC-2 Current Effective Multiple Profile Model........................ GRAPE20.DA T
2. HEC-2 Current Effective Floodway Mode.................................GRAPE21.DAT
3. HEC-RAS Imported Multiple Profile Model...............................7026.PRJ-p01
4. HEC-RAS Imported Floodway Model......................................7026.PRJ-p05
5. HEC-RAS Revised Conditions Multiple Profile Model................. 7026.PRJ-p03
6. HEC-RAS Revised Conditions Floodway Model...... ................. ..7026,PRJ-p06
IV. CONCLUSIONS
The results obtained by this study are in compliance with the current floodplain criteria
for the City of Coppel! and FEMA as shown in the summary of results in Table 2. The
table shows that, with the Denton Tap bridge replacement and coding cross sections
with recent aerial topography, the flood profile is lowered from downstream of Denton
Tap Road to upstream of Bethel Road.
~e~
2
z
o
1000
MAP
MAP NUMBER
48113C0155 J
EFFECTIVE DATE:
AUGUST 23, 2001
DALLAS COUNTY,
TEXAS AND
INCORPORATED AREAS
FlOOD INSURANCE PROGRAM
PANELS NOT PRIN-;-ED.I
~i..,M8Ell ClANE~ .SUW~
..SC'167 0'55
.ill0i-;'0 015~
~a:i1;" 1};5':i
~1160 Q;5S
FEET
INSURANCE RATE
'1\
/\PPROXIMA TE SCALE
o
1000
ROAD
f,:<E
SANOY
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Tributary 0-1
of' Grapevine Creek
BETHEL
Emergency Management Agency
This is an official copy of a portion of the above referenced flood map. It
was extracted using F-MIT On-Une. This map does not reflect changes
or amendments which may have been made subsequent to the date on the
title block. For the latest product information about National Flood Insurance
Program flood maps check the FEMA Flood Map Store at WMN,msc,fema.gov
ST L9:J~~
Grapevine
Creek
- "-~- ._~_.~~.. ~ ~
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,,-~-
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Summary of Discharges (Cont'd)
Table 4
Peak Discharges (Cubic Feet per Second)
50- Year 100- Year 500- Year
5,900
5,400
3,700
3,700
4,700
4,300
2,950
2,950
4,200
3,850
2,650
2,650
10-Year
3,050
2,800
1,900
1,900
2.02
1.67
1.18
1.06
Flooding Source and Location
GLENN BRANCH
At confluence with Little Creek
Approximately 3,200 feet below Bear Creek Road
Approximately 3,000 feet below Bear Creek Road
At Bear Creek Road
12,700
14,200
9,900
9,400
9.700
11,200
7,900
7,500
8.600
10 ,000
7,000
6,700
5.900
7,300
5,100
4,900
48
5.95
3.68
2.77
11
GRAPEVINE CREEK
At mouth
At intersection with extension
of Cotton Road
At Radio Road
At State Route 114
27,700
19,600
21,400
15,200
18,900
13,400
13,300
9,400
21.22
15.13
HACKBERRY CREEK
At mouth
Above confluence of Cottonwood Branch
Below confluence of South Fork of
Hackberry Creek
Above confluence of South Fork of
0\
tv
100
18,900
15,500
5,800
22
17.300
14,900
12,300
4,600
15,400
13,200
11,000
4,150
,000
8,200
8,000
3,050
11
13.66
10.44
5.45
1.76
Hackberry Creek
Below confluence of Mud Springs Creek
Above confluence of Mud Springs Creek
3,650
3,650
1,500
.~,~~.';;':,""j';',!;)~i>:,..,.:;.i;.ij;;"/"~
4.850
3,000
1,250
4.350
2,700
1.100
150
2,050
850
3
16
1.44
0.39
2
HALL BRANCH
At confluence with White Rock Creek
Above right bank tributary approximately
400 feet below Weber Road
At upstream limit of detailed study
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FLOODING SOURCE
CROSS SECTION
Glenn Branch
A
B
C
D
E
Grapevine
Creek
A
B
C
D
E
F
G
\
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Tributary G-1
of Grapevine
Creek
A
B
DISTANCE
680'
1,9401
2,750'
3,670'
5,1001
8,5002
12,9002
14,1702
16,5432
20,7002
22,7002
24,0002
26,9212
32,1802
9454
3,1254
FLOODWA Y
WIDTH
(FEET)
SECTION AREA
(SQUARE FEET)
MEAN VELOCITY
(FEET PER
SECOND)
8,2
8.1
8.6
6.4
6.2
5.5
3.1
5.3
2.4
3.9
7.5
4.7
7.9
8.1
REGULATORY
636.8
644.4
650.4
658.7
688.9
439.6
448.0
453.0
461.5
471.5
478.0
482.5
491.2
506.7
4.0
7.3
493.7
499.5
BASE FLOOD
WATER-SURFACE ELEVATION
I WITHOUT I WITH I
FLOODWA Y FLOODWA Y
(FEET NGVD)
636.8
644.4
650.4
658.7
688.9
637,8
645.2
651.2
659.6
689.9
,-
Rt'<.-,,,;.-,.-,:,,
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64
58
55
69
130
576
531
343
464
479
438.53
448.0
453.0
461.5
471.5
478.0
482.5
491.2
506.7
438.53
448.5
453.8
462.3
472.3
478.4
482.9
491.8
507.1
INCREASE
1.0
0.8
0.8
0.9
1.0
0.0
0.5
0.8
0.8
0,8
0.4
0.4
0.6
0.4
0,0
0.2
IFeet above mouth 2Feet above confluence with Elm Fork Trinity River JElevation computed without consideralion of floodinl! from Elm Fork Trinity River 'Feel above confluence with Grapevine Creek
T
A
B
L
E
300
940
470
638
370
200
349
145
119
1,778
3,141
2,079
4,624
3,063
1,566
2,498
1,510
1,301
137
82
777
432
FEDERAL EMERGENCY MANAGEMENT AGENCY
8
DALLAS COUNTY, TX
AND INCORPORATED AREAS
493.7
499.5
493.7
499.7
FLOODWAY DATA
GLENN BRANCH - GRAPEVINE CREEK-
TRIBUTARY G-1 OF GRAPEVINE CREEK
GRAPEVINE CREEK
DALLAS COUNTY, TX
AND INCORPORATED AREAS
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FLOOD PROFILES
FEDERAL EMERGENCY MANAGEMENT AGENCY
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FEDERAL EMERGENCY MANAGEMENT AGENCY
DALLAS COUNTY, TX
AND INCORPORATED AREAS
N
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