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MAR 2013
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60 0 30 60
GRAPHIC SCALE
LEGEND
EFFECTIVE FP & FW (FEMA PRELIMINARY DFIRM/MAPMOD)
REVISED EXISTING FP - 100M (RS' DISCHARGE)
POST PROJECT FP - 100YR (RS DISCHARGE)
- - - - - - POST PROJECT FW (FIS DISCHARGE)
• • - POST PROJECT FP - 500?R (RS DISCHARGE)
9233 HYDRAULIC CROSS SEC77ON
485 PROPOSED GRADING
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jPARCELS (2012; DALLAS COUNTY APPRAISAL DIST.)
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WATER SURFACE ELEVATION COMPARISON (100- YEAR)
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* - WSEL unavailable because cross - section is not included in
WSEL unavailable because cross - sections were removed for
post - project modeling
NO TES
1. Effective floodplain and floodway based on Preliminary Digital Flood Insurance Rate Map (dFIRM) for Dallas
Coun ty.
2. Depicted data based on "Conditional Letter of Map Revision (CLOMR) for Sandy Lake Road and Freeport
Parkway at Cottonwood Branch" (Teague Nall and Perkins; March 2013).
J. 1 -foot topography obtained from ground survey conducted by 7A/P.
4. Existing and proposed bridge hydraulics evaluated using HEC -RAS v. 4.1 (USACE).
5. 2 -foot topography shown obtained from City of Coppell (NCTCOG; 2007).
6. Proposed bridge structure results in no rise during 100 -year nS and Ultimate floods.
7 Based on coordination with City staff, the proposed bridge structure provides 2 -feet of freeboard based on
FIS flows (6700cfs,• 2001 Dallas County RS) and 1 -foot freeboard based on Ultimate Flows (8250cfs;
City -ode Storm Water Management Study, January 1991).
8. Al! survey and mopping completed using NA 88 vertical datum and NAD83 StatePlone Zone 4202 (TX
North Central) horizontal datum.
*A
NIRAJ .. ACHARYA n �y 1-3 � ............................ d`r !.r
��•. 107110.
1411,x\6��� Date:
L
City of Coppell, Texas
' "P P' °ieC'
CPL00243
Conditional Letter of Map Revision (CLOMR) for
EXHIBIT
Sandy Lake Rd. and Freeport Pkwy at Cottonwood Branch
FIS Ftow 6700 cis
��.r �?
EXISTING /FIS DISCHARGES
tierriaetfljtt
Perojct
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9233
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477.35
477.35
9475
478.37
478.30
9494
477.5
477.54
**
9526
479.4
480.42
*"
9590
481.9
482.24
479.51
9890
482.50
480.38
10120
481.9
482.87
481.93
10130
482.7
482.90
482.00
* - WSEL unavailable because cross - section is not included in
WSEL unavailable because cross - sections were removed for
post - project modeling
NO TES
1. Effective floodplain and floodway based on Preliminary Digital Flood Insurance Rate Map (dFIRM) for Dallas
Coun ty.
2. Depicted data based on "Conditional Letter of Map Revision (CLOMR) for Sandy Lake Road and Freeport
Parkway at Cottonwood Branch" (Teague Nall and Perkins; March 2013).
J. 1 -foot topography obtained from ground survey conducted by 7A/P.
4. Existing and proposed bridge hydraulics evaluated using HEC -RAS v. 4.1 (USACE).
5. 2 -foot topography shown obtained from City of Coppell (NCTCOG; 2007).
6. Proposed bridge structure results in no rise during 100 -year nS and Ultimate floods.
7 Based on coordination with City staff, the proposed bridge structure provides 2 -feet of freeboard based on
FIS flows (6700cfs,• 2001 Dallas County RS) and 1 -foot freeboard based on Ultimate Flows (8250cfs;
City -ode Storm Water Management Study, January 1991).
8. Al! survey and mopping completed using NA 88 vertical datum and NAD83 StatePlone Zone 4202 (TX
North Central) horizontal datum.
*A
NIRAJ .. ACHARYA n �y 1-3 � ............................ d`r !.r
��•. 107110.
1411,x\6��� Date:
L
City of Coppell, Texas
' "P P' °ieC'
CPL00243
Conditional Letter of Map Revision (CLOMR) for
EXHIBIT
Sandy Lake Rd. and Freeport Pkwy at Cottonwood Branch
L
2A
TOPOGRAPHIC WORKMAP - SANDY LAKE
EXISTING /FIS DISCHARGES
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MAR 2013
teague nail & perkins
17304 Preston Road, Suite 1340
Dallas, Texas 75252
tn 214.461.9867 ph 214.461.9864 fx
s TBPE Registration No. F -230
www.tnpinc.comm
! .........................:*
NIRAJ A. ACHARYA
107110.
m
Date:
City of Coppell, Texas
trip project
CPL00243
Conditional Letter of Map Revision (CLOMR) For
EXHIBIT
Sandy Lake Rd. and Freeport Pkwy at Cottonwood Branch
2B
TOPOGRAPHIC WORKMAP - SANDY LAKE
ULTIMATE CONDITIONS DISCHARGES
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1" =40'
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MAR 2013
teague nall & perkins
17304 Preston Road, Suite 1340
Dallas, Texas 75252
214.461.9867 ph 214.461.9864 fx
TBPE Registration No. F -230
www.tnpinc.com
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..............................
NIRAJ A. ACHARYA
ran: ' 107110
is
Date:
City of Coppell, Texas
Conditional Letter of Map Revision (CLOMR) for
Sandy Lake Rd. and Freeport Pkwy at Cottonwood Branch
TOPOGRAPHIC WORKMAP - FREEPORT
EXISTING /FIS DISCHARGES
EXHIBIT
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vert
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MAR 2013
a
teague nail & perkins
17304 Preston Road, Suite 1340
Dallas, Texas 75252
214.461.9867 ph 214.461.9864 fx
TBPE Registration No. F -230
www.tnpinc.com
40 0 20 40
GRAPHIC SCALE
�i LEGEND
EFFECTIVE FP & FW (FEMA PRELIMINARY DRRM/MAPMOD)
— REVISED EXISTING FP — 100YN (ULT)
— • — • — • — POST PROJECT FP — 100 Y (UL T)
9233 HYDRAULIC CROSS SECTION
o� PROPOSED GRADING
PARCELS (2012; DALLAS COUNTY APPRAISAL DIST.)
WATER SURFACE ELEVATION COMPARISON (100- YEAR)
- WSEL unavailable because cross - section is not included in effective
model
*` - WSEL unavailable because cross - sections were removed for post -
project modeling
NO TES:
1. Effective floodplain and floodway based on Preliminary Digital Flood Insurance Rate Map (dRRM) for Dallas
County.
2. Depicted data based on "Conditional Letter of Map Revision (CLOMR) for Sandy Lake Road and Freeport
Parkway at Cottonwood Branch" (Teague Nall and Perkins; March 2013).
J. 1 —foot topography obtained from ground survey conducted by TNP.
4. Existing and proposed bridge hydraulics evaluated using HEC —RAS v. 4.1 (USACE).
5. 2 —foot topography shown obtained from City of Coppell (NCTCOG; 2007).
6. Proposed bridge structure results in no rise during 100 year RS and Ultimate floods.
7 In accordance with a variance issued by the City, the proposed bridge structure provides 2 —feet of
freeboard based on RS flows (2001 Dallas County F1S) and 1 —foot freeboard based on Ultimate Flows
(City Wide Storm Water Management Study, January 1991).
8. All survey and mapping completed using NAW88 vertical datum and NAD83 StatePlone Zone 4202 (TX
North Central) horizontal datum.
qtr:' '•.• `
* :......:...................
/ NIRAJ A. ACHARYA j
..............................
2613 %1-. 107110 .iii
Date:
City of Coppell, Texas
Conditional Letter of Map Revision (CLOMR) for
indy Lake Rd. and Freeport Pkwy at Cottonwood Branch
TOPOGRAPHIC WORKMAP - FREEPORT
ULTIMATE CONDITIONS DISCHARGES
EXHIBIT
3B
eh bmpa son
F YYFFai JL4Niill:
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ry�5
`'. S k- `�`Y.t'�5
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12420
491.71
491.71
12539
492,6
492.19
12567
49172
492.79
12595
492.59
-
12661
493.87
-
12707
494.24
493.32
12868
494.19
49121
12957
1 494.26
493.3
- WSEL unavailable because cross - section is not included in effective
model
*` - WSEL unavailable because cross - sections were removed for post -
project modeling
NO TES:
1. Effective floodplain and floodway based on Preliminary Digital Flood Insurance Rate Map (dRRM) for Dallas
County.
2. Depicted data based on "Conditional Letter of Map Revision (CLOMR) for Sandy Lake Road and Freeport
Parkway at Cottonwood Branch" (Teague Nall and Perkins; March 2013).
J. 1 —foot topography obtained from ground survey conducted by TNP.
4. Existing and proposed bridge hydraulics evaluated using HEC —RAS v. 4.1 (USACE).
5. 2 —foot topography shown obtained from City of Coppell (NCTCOG; 2007).
6. Proposed bridge structure results in no rise during 100 year RS and Ultimate floods.
7 In accordance with a variance issued by the City, the proposed bridge structure provides 2 —feet of
freeboard based on RS flows (2001 Dallas County F1S) and 1 —foot freeboard based on Ultimate Flows
(City Wide Storm Water Management Study, January 1991).
8. All survey and mapping completed using NAW88 vertical datum and NAD83 StatePlone Zone 4202 (TX
North Central) horizontal datum.
qtr:' '•.• `
* :......:...................
/ NIRAJ A. ACHARYA j
..............................
2613 %1-. 107110 .iii
Date:
City of Coppell, Texas
Conditional Letter of Map Revision (CLOMR) for
indy Lake Rd. and Freeport Pkwy at Cottonwood Branch
TOPOGRAPHIC WORKMAP - FREEPORT
ULTIMATE CONDITIONS DISCHARGES
EXHIBIT
3B