Billingsley-SY130325 U.S.DEPARTMENT OF HOMELAND SECURITY p,M.B No.1660-0016
FEDERAL EMERGENCY MANAGEMENT AGENCY Expires February 28,2014
RIVERINE HYDROLOGY & HYDRAULICS FORM
PAPERWORK BURDEN DISCLOSURE NOTICE
searching ing existing burden sources,gathering athering and maintaining ng the needed data,response.
nd completing,reviewing,and includes submitting the form.You'are no�uctions,
required existing data s 9
regardin the respond ac rac this of collection any suggestion Osnfor reducing this burden appears
o: the Collections Management,Department of
Homeland the accuracy
Homel001 uEmergency Management n cn u Arlington 20958-3005,
(1660-0016).Submission of the form is required to obtain or retain benefits under the National Flood Insurance Program.Please do not send your
completed survey to the above address.
PRIVACY ACT STATEMENT
AUTHORITY:The National Flood Insurance Act of 1968,Public Law 90-448,as amended by the Flood Disaster Protection Act of 1973,Public Law
93-234. eli eligibility to request changes to National
PRINCIPAL PURPOSE(S):This information is being collected for the purpose of determining an applicant's 9 Y
Flood Insurance Program(NFIP)Flood Insurance Rate Maps(FIRM).
ROUTINE USE(S):The information on this form may be disclosed as generally permitted under 5 U.S.0§552a(b)of the Privacy Act of 1974,as
amended.This includes using this information a of ion Amendment(LOMA)authorized d by the routine
15,2006,7u uses published 9 in DHS/FEMNNFIP/COMA-1 National
DISCLOSURE:Insurance The disclosure(NFIP);
DISCLOSURE:The determination et•ardin• a re.nested chan.e to however,
a NFIP Flood provide the
information atFlRMquested may delay or prevent
FEMA from •roessn
Flooding Source: Gra•evine Creek
Note:Fill out one form for each flooding source studied
A. HYDROLOGY
1. Reason for New Hydrologic Analysis (check all that apply)
® analysis ❑ Improved data
❑ No existing Not revised(skip to section B) ❑ Changed physical condition of watershed
❑ Alternative methodology ❑ Proposed Conditions(CLOMR)
2. Comparison of Representative 1%-Annual-Chance Discharges Revised(cfs)
Location Drainage Area(Sq.Mi.)
Effective/FIS(cfs)
3. Methodology for New Hydrologic Analysis (check all that apply)
❑ Statistical Analysis of Gage Records ❑ Precipitation/Runoff Model 4 Specify Model:
❑ Regional Regression Equations ❑
Other(please attach description)
Please enclose all relevant models in digital format,maps,computations(including computation of parameters),and documentation to support the
new analysis.
4. Review/Approval of Analysis
If your community requires a regional,state,or federal agency to review the hydrologic analysis,please attach evidence of approval/review.
5. Impacts of Sediment Transport on Hydrology
Is the hydrology for the revised flooding source(s)affected by sediment transport? ❑Yes ❑No
If yes,then fill out Section F(Sediment Transport)of Form 3. If No,then attach your explanation..
Previously FEMA Form 81-89
MT-2 Form 2 Page 1 of 3
FEMA Form 086-0-27A,(2/2011)
B. HYDRAULICS
1. Reach to be Revised
Description Cross Section Water-Surface Elevations(ft.)
Effective Proposed/Revised
Downstream Limit* Approx.400 ft u/s MacArthur 11453 445.97 445.92
Blvd.
Upstream Limit* Upstream face of Belt Line Rd. 17600
462.04 462.35
*Proposed/Revised elevations must tie-into the Effective elevations within 0.5 foot at the downstream and upstream limits of revision.
2. Hydraulic Method/Model Used: HEC-RAS v4.1.0
3. Pre-Submittal Review of Hydraulic Models*
DHS-FEMA has developed two review programs,CHECK-2 and CHECK-RAS,to aid in the review of HEC-2 and HEC-RAS hydraulic models,
respectively. We recommend that you review your HEC-2 and HEC-RAS models with CHECK-2 and CHECK-RAS.
4. Floodwav Run Datum
Models Submitted Natural Run
File Name: Plan Name: File Name: Plan Name: NGVD88
Duplicate Effective Model* 186PSFP.dat N/A 186PSFW.dat N/A
File Name: Plan Name: File Name: Plan Name: NGVD88
Corrected Effective Model* 186PSFP.dat N/A 186PSFW.dat N/A
Existing or Pre-Project File Name: Plan Name: File Name: Plan Name:
Conditions Model 119LOMR.prj 119LOMR.p22 119LOMR.prj 119LOMR.p23 NGVD88
Revised or Post-Project File Name: Plan Name: File Name: Plan Name:
Conditions Model 119LOMR.prj 119LOMR.p18 119LOMR.prj 119LOMR.P19 NGVD88
File Name: Plan Name:
File Name: Plan Name:
Other-(attach description)
*For details,refer to the corresponding section of the instructions.
❑ Digital Models Submitted?(Required)
/
C. MAPPING REQUIREMENTS
A certified topographic work map must be submitted showing the following information(where applicable):the boundaries of the effective,existing,
and proposed conditions 1%-annual-chance floodplain(for approximate Zone A revisions)or the boundaries of the 1%-and 0.2%-annual-chance
floodplains and regulatory floodway(for detailed Zone AE,AO,and AH revisions);location and alignment of all cross sections with stationing control
indicated;stream,road,and other alignments(e.g.,dams,levees,etc.);current community easements and boundaries;boundaries of the requester's
property;certification of a registered professional engineer registered in the subject State;location and description of reference marks;and the
referenced vertical datum(NGVD,NAVD,etc.).
® Digital Mapping(GIS/CADD)Data Submitted(preferred)
Topographic Information: See MT-2 Form 2 Attachment
Source: TNRIS LiDAR—Texas Natural Resource Information S Date: 2009
Accuracy: 0.07 Meters Vertical,I Meter Horizontal
Note that the boundaries of the existing or proposed conditions floodplains and regulatory floodway to be shown on the revised FIRM and/or FBFM
must tie-in with the effective floodplain and regulatory floodway boundaries.Please attach a copy of the effective FIRM and/or FBFM,at the same
scale as the original,annotated to show the boundaries of the revised 1%-and 0.2%-annual-chance floodplains and regulatory floodway that tie-in with
the boundaries of the effective 1%-and 0.2%-annual-chance floodplain and regulatory floodway at the upstream and downstream limits of the area on
revision.
® Annotated FIRM and/or FBFM(Required)
FEMA Form 086-0-27A,(2/2011)
Previously FEMA Form 81-89 MT-2 Form 2 Page 2 of 3
MT-2 Form 2 Attachment
Grapevine Creek
Macarthur Center Site
C. Mapping Requirements
The topographic data used for cross-section 11453 through 15113 this LOMR is
the same data used for the previous CLOMR(Case No.: 04-06-A148R) approved
by FEMA in January 2006, and LOMR (Case No.: 06-06-BE95P) approved by
FEMA in May 2007. Information regarding this topography is unavailable.
The topographic data used for mapping at cross-sections 15160 through 17600 is
based on 2009 Texas Natural Resource Information System LiDAR.
D. COMMON REGULATORY REQUIREMENTS*
1. For LOMR/CLOMR requests,do Base Flood Elevations(BFEs)increase? 0 Yes ❑ No
a. For CLOMR requests,if either of the following is true,please submit evidence of compliance with Section 65.12 of the NFIP regulations:
• The proposed project encroaches upon a regulatory floodway and would result in increases above 0.00 foot compared to pre-project
conditions.
• The proposed project encroaches upon a SFHA with or without BFEs established and would result in increases above 1.00 foot
compared to pre-project conditions.
b. Does this LOMR request cause increase in the BFE and/or SFHA compared with the effective BFEs and/or SFHA? ® Yes ❑ No
If Yes,please attach proof of property owner notification and acceptance(if available). Elements of and examples of property owner
notifications can be found in the MT-2 Form 2 Instructions.
2. Does the request involve the placement or proposed placement of fill? ® Yes ❑ No
If Yes,the community must be able to certify that the area to be removed from the special flood hazard area,to include any structures or
proposed structures,meets all of the standards of the local floodplain ordinances,and is reasonably safe from flooding in accordance with the
NFIP regulations set forth at 44 CFR 60.3(A)(3),65.5(a)(4),and 65.6(a)(14). Please see the MT-2 instructions for more information.
3. For LOMR requests,is the regulatory floodway being revised? 0 Yes ❑ No
If Yes,attach evidence of regulatory floodway revision notification. As per Paragraph 65.7(b)(1)of the NFIP Regulations,notification is
required for requests involving revisions to the regulatory floodway. (Not required for revisions to approximate 1%-annual-chance floodplains
[studied Zone A designation]unless a regulatory floodway is being established.Elements and examples of regulatory floodway revision
notification can be found in the MT-2 Form 2 Instructions.)
4. For CLOMR requests,please submit documentation to FEMA and the community to show that you have complied with Sections 9 and 10 of the
Endangered Species Act(ESA).
For actions authorized,funded,or being carried out by Federal or State agencies,please submit documentation from the agency showing its
compliance with Section 7(a)(2)of the ESA.Please see the MT-2 instructions for more detail.
*Not inclusive of all applicable regulatory requirements. For details,see 44 CFR parts 60 and 65.
FEMA Form 086-0-27A,(2/2011) Previously FEMA Form 81-89 MT-2 Form 2 Page 3 of 3
Key to Features l' 1*1 " �`
As Built Survey Point �, t,. F 1 .4" ` ,--, : I P.
Revised Floodway
0 Revised 100-Year Floodplain `_
P � F k N.�i`'RT" R^ .F, $,,v"4- y t Y'� '�. Y�F('' � G
TN
Revised 500-Year Floodplain `'" , , :9&<,
x F s .r a �,* p,;prph € 1,,,e`, # `'���<Po 1 '(
LOMR 500 Year Floodplain . * ; .; t i i, 4-f x ,°°�� ( QSO `qr,4.
LOMR 100-Year Floodplain 4,; ` o'er
LOMR Floodway '�i� :\_,_,---,3
; cs
— Major Road 0 459 bso,
4y
10 foot Contour , ¢o .r , ,. ,. .
2-foot Contour RDA c D � 41 a
460
° as
450 v , 1 c , * � � � f'4n � - aso-- °I
..
450
Fx, . 5n e ,
,� « �-s
Project P ; r`t etV / 4sa aso!' y..45 'Y-i '45?"
Letter of Map Revision t s ( asi, , ,57' - ,
For MacArthur Centers g' / — o ��
, , 450 i 450
Title
Revised Floodplain '',�o'� �( AS
0 500 1,000 h � �f q T
o- f
j n
V
Scale in Feet '" 4. " ° ° 0 1 U° ,,— y� O
0
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ZONE
CRANE Rp REVISED AREA ' i NATIONAL FLOOD INSURANCE PROGRAM
i DRlb'E S'
d� , ' , .' , t ac ZONE X
FIRM
_ cq- ,, � „ � FLOOD INSURANCE RATE MAP
RM198
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--,.___ INCORPORATED AREAS
�` �`' ' PANEL 155 OF 725
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�°^' a '�g,�' N COMMUNITY EL!JEEP. PANEL SUFFIX•S S� ✓aim .4. fd e �F' f SF” '^ 4... .,0: i e c ,r 4$0]0 0,.
`, sky TM +s »qs .+� ,p y�' ri �'r,0. onttas.c n>_� 40,11 0135 .)i
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? P {-R.v4 A `d � 4"98 tl
ill
� , i� Grapevine Creek ,a I MAP NUMBER
, ,a��s� ,= O 48113C0155 I
,.) 1
,,,e,,,Th
EFFECTIVE DATE:
AUGUST 23,2001
, ' r ";.Mw Q z CITY OF IR�'ING
"�' ✓n o tta- A3 MNCa s,n 1 J Z
s 480180
vy Q cc
$. n€ 0 Q
x ,:1, z lli ri 63 i ZONE X j Federal Emergency Management Agency
s)$'y x ? l '- Fes' f- rc �Q' This is an official copy of a portion of the above referenced flood map. h
,� Ao n,` r U () 7 was extracted using F-MIT On-Line. This map does not reflect changes
r) r F'
or amendments which may have been made subsequent to the date on the
# fir`,: �'. ' title block. For the latest product information about National Flood Insurance
Program flood maps check the FEMA Flood Map Store at wVwe.msc.ferns.gov
Table 2
FEDERAL EMERGENCY MANAGEMENT AGENCY
WATER SURFACE ELEVATION COMPARISON-DUPLICATE EFFECTIVE HEC-2 VS. DUPLICATE EFFECTIVE HEC-RAS
Community Name Flooding Source Project Name/Identifier
City of Coppell Grapevine Creek MacArthur Center LOMR
2007 LOMR APPROVED DUPLICATED MODEL
LOCATION MODEL(HEC-2) (HEC-RAS) DIFFERENCE
189PSFP.dat 119LOMR.P02
SECNO
NCWSEL1 SECNO NCWSEL1 SECNO NCWSEL1
270-ft U/S of MacArthur 11313 446.00 11313 446.02 11313 0.02
D/S Property Limit 11453 445.97 11453 445.92 11453 -0.05
11588 447.76 11588 447.94 11588 0.18
12402 449.11 12402 449.23 12402 0.12
12820 449.41 12820 449.53 12820 0.12
13339 449.88 13339 450.00 13339 0.12
13620 451.55 13620 451.61 13620 0.06
U/S Property Limit 13829 452.01 13829 451.95 13829 -0.06
14170 454.20 14170 454.39 14170 0.19
14495 455.06 14495 455.17 14495 0.11
14820 456.58 14820 456.67 14820 0.09
15113 457.26 15113 457.37 15113 0.11
15160 457.50 15160 457.59 15160 0.09
Belt Line Road
15310 457.55 15310 457.65 15310 0.10
15600 457.52 15600 457.63 15600 0.11
ST.LOUIS S.W.R.R.
15610 457.66 15610 457.79 15610 0.13
15630 457.69 15630 457.80 15630 0.11
15640 457.80 15640 457.91 15640 0.11
15650 457.82 15650 457.93 15650 0.11
15660 457.61 15660 457.72 15660 0.11
15680 458.09 15680 458.24 15680 0.15
15730 458.37 15730 458.51 15730 0.14
16480 460.33 16480 460.40 16480 0.07
17600 462.04 17600 462.07 17600 0.03
17980 463.47 17980 463.50 17980 0.03
18150 463.60 18150 463.63 18150 0.03
18210 463.71 18210 463.75 18210 0.04
18240 463.47 18240 463.51 18240 0.04
18320 464.10 18320 464.16 18320 0.06
18450 464.46 18450 464.52 18450 0.06
18500 464.09 18500 464.15 18500 0.06
18514 464.11 18514 464.19 18514 0.08
18515 464.04 18515 464.12 18515 0.08
COMMENTS:
1-100-year(natural)Water Surface Elevation
1-5 Sheet 1 of 1
LOMR FEMA Table 2 Halff Associates, Inc. 3/25/2013
Table 3
FEDERAL EMERGENCY MANAGEMENT AGENCY
WATER SURFACE ELEVATION CHECK
Community Name Flooding Source Project Name/Identifier
City of Coppell Grapevine Creek MacArthur Center LOMR
LOCATION 2007 LOMR APPROVED MODEL(HEC-2) DUPLICATED MODEL(HEC-2) CORRECTED EFFECTIVE(HEC-RAS) EXISTING(PRE-PROJECT) REVISED(POST-PROJECT)
189PSFP.dat 186PSFP.dat 119LOMR.P16 119LOMR.P22 119LOMR.P18
i, NCWSEL 1 FCWSEL 2 SURC.3 � NCWSEL 1 FCWSEL 2 SURC.3 NCWSEL 1 FCWSEL 2 SURC.3 NCWSEL 1 1 FCWSEL 2 SURC.3 NCWSEL 1 FCWSEL 2 SURC.3
zr .4r a �?; u„.
270-ft U/S of MacArthur t'k. ' 446.00 446.04 0.04 446.00 446.04 0.04 446.02 446.05 0.03 446.02 446.05 0.03 446.02 446.05 0.03
D/S Property Limit 445.97 446.01 0.04 445.97 446.01 0.04 , 445.92 445.96 0.04 445.92 ` 445.96 0.04 445.92 445.96 0.04
447.76 447.77 0.01 - as 447.76 447.77 0.01 i 447.91 447.91 0.00 447.91 447.91 0.00 447.85 447.86 0.01
0. , '.r 449.11 449.52 0.41 i 449.11 449.52 0.41 449.19 449.55 0.36 449.19 449.55 0.36 448.57 448.57 0.00
449.41 450.20 0.79 449.41 450.20 0.79 449.50 450.22 0.72 449.50 450.22 0.72 448.80 448.80 0.00
• 449.88 450.86 0.98 449.88 450.86 0.98 , . 450.15 451.14 0.99 450.15 451.14 0.99 449.56 449.56 0.00
451.55 452.50 0.95 ,k _ 451.55 452.50 0.95 " < %' 451.64 452.57 0.93 451.64 452.57 0.93 450.89 450.96 0.07
U/S Property Limit s 452.01 452.90 0.89 452.01 452.90 0.89 .4'44 452.21 452.88 0.67 452.21 452.88 0.67 452.12 452.37 0.25
j 454.20 454.98 0.78 - 454.20 454.98 0.78 454.36 455.00 0.64 454.36 455.00 0.64 454.38 455.09 0.71
455.06 455.61 0.55 455.06 455.61 0.55 '',- ` 455.16 455.63 0.47 455.16 455.63 0.47 455.16 455.68 0.52
.., „ 456.58 457.18 0.60 8 456.58 457.18 0.60 ` 456.66 457.22 0.56 456.66 457.22 0.56 456.67 457.23 0.56
F - E4"` c_. 4;,,:. 'tee`+'
f z 457.26 457.79 0.53 r = 457.26 457.79 0.53 457.45 457.90 0.45 457.45 457.90 0.45 457.45 457.91 0.46
f - 457.50 457.97 0.47 457.50 457.97 0.47 457.66 458.06 0.40 457.66 458.06 0.40 457.66 458.07 0.41
1
Belt Line Road ' - k Y a0 _
457.55 458.02 0.47 g x 457.55 458.02 0.47 457.72 458.12 0.40 457.72 458.12 0.40 457.72 458.13 0.41 457.52 457.88 0.36 457.52 457.88 0.36 : 457.70 458.09 0.39 457.70 458.09 0.39 457.70 458.10 0.40
ST. LOUIS S.W. R.R.
0 457.66 458.05 0.39 457.66 458.05 0.39 t 457.86 _ 458.23 0.37 457.86 458.23 0.37 457.86 458.24 0.38
457.69 458.06 0.37 457.69 458.06 0.37 1 a 457.83 s 457.98 0.15 457.83 457.98 s 0.15 457.83 457.99 0.16
457.80 458.15 0.35 457.80 458.15 0.35 .' 457.75 457.83 0.08 457.75 457.83 0.08 457.75 457.83 0.08
it ,X
a 457.82 458.18 0.36 6 a' 457.82 458.18 0.36 �. `: 457.72 457.80 0.08 457.72 457.80 _ 0.08 457.72 457.80 0.08
r K 7 457.61 458.09 0.48 X 12 •- " 457.61 458.09 0.48 15 457.90 458.06 0.16 457.90 458.06 0.16 457.90 458.07 0.17
, 458.09 458.72 0.63 . .= 458.09 458.72 0.63 ': 457.94 458.13 0.19 457.94 458.13 0.19 457.94 458.14 0.20
- 1 `1` 458.37 458.95 0.58 ;. 1, 458.37 458.95 0.58 458.45 458.76 0.31 458.45 458.76 s 0.31 458.45 458.77 0.32
t t' 460.33 460.68 0.35 i,.:.;1'' 460.33 460.68 0.35 t1,: i‘i 460.86 461.57 0.71 460.86 461.57 _ 0.71 460.86 461.57 0.71
1- 462.04 462.35 0.31 1f . , 462.04 462.35 0.31 -17, 462.35 463.02 0.67 462.35 463.02 0.67 462.35 463.02 0.67
'">' - 463.47 463.70 0.23 7•` 463.47 463.70 0.23 17 463.58 463.99 0.41 463.58 463.99 0.41 463.58 463.99 0.41
fi 463.60 463.76 0.16 to 463.60 463.76 0.16 463.71 464.05 0.34 463.71 464.05 0.34 463.71 464.05 0.34
463.71 463.88 0.17 . 463.88 0.17 :a 4,ii 463.82 464.15 0.33 463.82 464.15 0.33 463.82 464.15 0.33
1824,0, , 463.47 463.83 0.36 1 i 463.47 463.83 0.36 16440 463.60 464.12 0.52 463.60 464.12 0.52 463.60 464.12 0.52
-• 464.10 464.53 0.43 ,±s A,. 464. 10 464.53 0.43 w'1 gs�e 464.20 464.69 0.49 464.20 464.69 0.49 464.20 464.69 0.49
�: 464.46 465.31 0.85 r *,• 464.46 465.31 0.85 464.55 465.41 0.86 464.55 465.41 0.86 464.55 465.41 0.86
/.* 464.09 465.07 0.98 . r=_ 464.09 465.07 0.98 , =1 464.20 465.19 0.99 464.20 465.19 0.99 464.20 465.19 0.99
1 464.11 465.04 0.93 '1 '14. " 464.11 465.04 0.93 18514 464.23 465.16 0.93 464.23 465.16 0.93 464.23 465.16 0.93
18515 464.04 464.99 0.95 is**1 464.04 464.99 0.95 .18515 464.16 465.11 0.95 464.16 465.11 0.95 464.16 465.11 0.95
COMMENTS:
1-100-year(natural)Water Surface Elevation 2-Encroachment(floodway)Water Surface Elevation 3-Surcharge Value
1-7 Sheet 1 of 1
LOMR FEMA Table 3 Halff Associates, Inc. 3/25/2013
Table 4
MACARTHUR CENTER FLOODPLAIN STUDY(FULLY DEVELOPED LANDUSE CONDITIONS)
WATER SURFACE ELEVATION, CHANNEL VELOCITY,AND VALLEY STORAGE CHECK
Community Name Flooding Source Project Name/Identifier
City of Coppell Grapevine Creek MacArthur Center
LOCATION ;,CORRECTED EFFECTIVE(HEC-RAS) EXISTING(PRE-PROJECT) REVISED(POST-PROJECT) DIFFERENCE
119LOMR.P20 119LOMR.P24 119LOMR.P21 --_
talitqA NCWSEL =NM VOL NCWSEL MEE VOL NCWSEL Mt I= VOL NCWSEL aragE VOL
kiiiiitiVi
270-ft U/S of MacArthur Lai72,124 448.22 6.73 255.14 448.22 6.73 255.14 448.22 6.73 255.14 0.00 0.00 0.00
D/S Property Limit atigati 448.10 13.16 261.93 448.10 13.16 261.93 448.10 13.16 261.93 0.00 0.00 0.00
..T . 450.67 6.06 276.12 450.67 6.06 276.12 450.50 5.24 270.08 -0.17 -0.82 -6.04
f ,, a 451.54 3.73 362.50 451.54 3.73 362.50 451.30 3.88 334.03 -0.24 0.15 -28.47
w.n' 451.73 3.37 415.75 451.73 3.37 415.75 451.50 4.46 371.72 -0.23 1.09 -44.03
cr:+itarlal 452.21 5.34 516.27 452.21 5.34 516.27 452.15 4.76 456.52 -0.06 -0.58 -59.75
`,,r r 452.92 5.89 579.30 452.92 5.89 579.30 452.77 6.25 518.06 -0.15 0.36 -61.24
U/S Property Limit tgrat 453.40 8.67 599.90 453.40 8.67 599.90 453.31 8.83 536.93 -0.09 0.16 -62.97
7. % 455.24 7.31 633.05 455.24 7.31 633.05 455.22 7.35 569.71 -0.02 0.04 -63.34
, tv *z 456.20 7.82 654.04 456.20 7.82 654.04 456.19 7.84 590.63 -0.01 0.02 -63.41
> "F, 457.81 7.16 677.91 457.81 7.16 677.91 457.80 7.17 614.47 -0.01 0.01 -63.44
:4. 1.?". •" 458.67 8.92 710.00 458.67 8.92 710.00 458.67 8.92 646.55 0.00 0.00 -63.45
'A`t:,',':::1:71 458.88 8.38 712.95 458.88 8.38 712.95 458.88 8.38 649.50 0.00 0.00 -63.45
Belt Line Road 4.4 .f k.
� '( 459.02 8.29 719.23 459.02 8.29 719.23 459.02 8.29 655.77 0.00 0.00 -63.46
(
'';'Yn:Milil 458.97 10.01 722.88 458.97 10.01 722.88 458.97 10.01 659.43 0.00 0.00 -63.45
ST. LOUIS S.W.R.R. ,�
7511Trli 461.34 8.40 723.24 461.34 8.40 723.24 461.34 8.40 659.78 0.00 0.00 -63.46
ittaari 461.67 7.92 724.31 461.67 7.92 724.31 461.67 7.92 660.85 0.00 0.00 -63.46
117227:A 461.62 8.47 724.70 461.62 8.47 724.70 461.62 8.47 661.24 0.00 0.00 -63.46
bia.ali 461.59 8.83 725.06 461.59 8.83 725.06 461.59 8.83 661.61 0.00 0.00 -63.45
a:172222,'
t.7.'r 2 461.63 8.76 725.42 461.63 8.76 725.42 461.63 8.76 661.97 0.00 0.00 -63.45
,, A 4... 461.64 9.04 726.13 461.64 9.04 726.13 461.64 9.04 662.67 0.00 0.00 -63.46
44:1172214'
., . a 462.01 8.64 727.70 462.01 8.64 727.70 462.01 8.64 664.24 0.00 0.00 -63.46
', ; ,a`c 463.66 4.14 806.33 463.66 4.14 806.33 463.66 4.14 742.86 0.00 0.00 -63.47
14;:ralli 464.58 7.06 939.55 464.58 7.06 939.55 464.58 7.06 876.08 0.00 0.00 -63.47
--. x 1,; :a 465.34 4.64 987.73 465.34 4.64 987.73 465.34 4.64 924.26 0.00 0.00 -63.47
COMMENTS:
1-100-year(Fully Developed)Water Surface Elevation 2-Channel Velocity(fps) 3-Valley Storage Volume(ac-ft)
1-9 Sheet 1 of 1
LOMR Ultimate Table 4 Half Associates, Inc. 5/1/2013
Table 5
MACARTHUR CENTER FLOODPLAIN STUDY(FULLY DEVELOPED LANDUSE CONDITIONS)
CHANNEL VELOCITY COMPARISON FOR THE 2-YEAR AND 100-YEAR
Community Name Flooding Source Project Name/Identifier
City of Coppell Grapevine Creek MacArthur Center
V.PtViAsirf, CORRECTED POST-PROJECT
LOCATION EFFECTIVE(HEC-RAS) (HEC-RAS) DIFFERENCE
186PROPFD.dat 119LOMR.p21
2-YR 100-YR 2-YR 100-YR 2-YR 100-YR
270-ft U/S of MacArthur 3.80 6.73 3.80 6.73 0.00 0.00
D/S Property Limit ?2-1(.1.17A
8.28 13.16 8.28 13.16 0.00 0.00
i:7417:31 6.20 6.06 3.84 5.24 -2.36 -0.82
. a 4.65 3.73 3.01 3.88 -1.64 0.15
!o::Eall 3.20 3.37 3.36 4.46 0.16 1.09 ktalli 7.56 5.34 6.12 4.76 -1.44 -0.58
c' '`a..' 4.22 5.89 7.60 6.25 3.38 0.36
.rib e.7, 7.35 8.67 8.59 8.83 1.24 0.16
-- ,
r 4.90 7.31 4.83 7.35 -0.07 0.04
` >:: 102 7.26 7.82 7.20 7.84 -0.06 0.02
r7-4,-17,sA 4,ff 5.29 7.16 5.30 7.17 0.01 0.01
1:;.,.`,:;-;1-,' 3.93 8.92 3.93 8.92 0.00 0.00
U/S Property Limit .0 ' 3.53 8.38 3.53 8.38 0.00 0.00
r _,;
Belt Line Road � f�' _� if
tittul,.®, 3.53 8.29 3.53 8.29 0.00 0.00
itie:',747a 4.46 10.01 4.46 10.01 0.00 0.00
ST. LOUIS S.W.R.R. 'k
2 4.44 8.40 4.44 8.40 0.00 0.00
.,,,,mm.,,,,mmiti 5.85 7.92 5.85 7.92 0.00 0.00
.,:r,iq n 6,52 8.47 6.52 8.47 0.00 0.00
issirMi 6.85 8.83 6.85 8.83 0.00 0.00
tainfta 6.42 8.76 6.42 8.76 0.00 0.00
aroaa 6.77 9.04 6.77 9.04 0.00 0.00
atriEM 7.12 8.64 7.12 8.64 0.00 0.00
rrnrYtV. 4.20 4.14 4.20 4.14 0.00 0.00
, se, 6.54 7.06 6.53 7.06 -0.01 0.00
aizai 3.19 4.64 3.19 4.64 0.00 0.00
COMMENTS:
I-10 Sheet 1 of 1
LOMR Ultimate Table 5 Halff Associates, Inc. 5/1/2013