tete bayou openhousemeeting_021215
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Tete Bayou Update & Mapping
HistoryPh
arr C
anal
Tete Bayou
Hist
ory
Curr
ent
Effor
tFl
ood
Zone
sFl
oodw
ays
Deve
lop-
men
tTete Bayou Update & Mapping• Original Study Began January 2011 & Ended in March 2012
• Joint Venture Between Iberia Parish Gov’t & City of New Iberia
• Purposed of Original Study was to Reduce Flooding
• Original Study Consisted of:1) Topographic & Bathymetric Surveying2) Historical Data Collection3) Numerical Modeling4) Numerical Modeling Calibration & Validation5) Numerical Modeling Flood Reduction Alternatives
Hist
ory
Curr
ent
Effor
tFl
ood
Zone
sFl
oodw
ays
Deve
lop-
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tTete Bayou Update & Mapping
Flood Reduction Alternatives
1) Clean Tete Bayou and Pharr Canal2) Scenario No. 1 + Widen Pharr Canal & Remove Spoil Banks3) Scenario No. 2 + Divert Flow From Tete Bayou to Bayou Teche
Through a Sub-surface Box Culvert System 4) Scenario No. 1 + Widen Pharr Canal5) Scenario No. 4 + Widen Tete Bayou6) Scenario No. 1 + Pump Stations7) Scenario No. 1 + Storage Areas
Hist
ory
Curr
ent
Effor
tFl
ood
Zone
sFl
oodw
ays
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lop-
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tTete Bayou Update & Mapping
Drainage Area = 27.8 SQ. MI.Channel Length = 10.3 MI.
Hist
ory
Curr
ent
Effor
tFl
ood
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sFl
oodw
ays
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lop-
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tTete Bayou Update & Mapping
Storm Event Precipitation (in)2-Year, 24-Hour 4.8
5-Year, 24-Hour 6.5
10-Year, 24-Hour 7.8
25-Year, 24-Hour 9.6
50-Year, 24-Hour 11.1
100-Year, 24-Hour 12.6
500-Year, 24-Hour ≈16.0
December 30, 2006 5.0
July 14, 2014 4.4
Hurricane Lili (Oct 2002) 5.01
Hurricane Gustav (Sept 2008) 9.22
10.8 inches on 10/2 & 4.8 inches on 10/3/200220.5 inches on 8/31, 3.1 inches on 9/1, & 5.6 inches on
9/2/2008
Hist
ory
Curr
ent
Effor
tFl
ood
Zone
sFl
oodw
ays
Deve
lop-
men
tTete Bayou Update & Mapping
Crochet Rd
Belle Place Olivier Rd
Mullins Rd
Emile Verret Rd
-10
-5
0
5
10
15
010,00020,00030,00040,00050,00060,000
Elev
ation
(ft-N
AVD8
8)
Main Channel Distance (ft)
Drainage StructuresGround5 ft-NAVD88 Tailwater Elevation, 10-year Storm Event0 ft-NAVD88 Tailwater Elevation, 10-year Storm Event
Tailwater Sensitivity Analysis
Curr
ent
Effor
tFl
ood
Zone
sFl
oodw
ays
Deve
lop-
men
tTete Bayou Update & Mapping
Hist
ory
• Update Original Study (Emile Verret CON/SPAN, channel
cleaning/debris removal, Pharr Canal)
• Study FEMA Approximate Zone A
• Create BFEs
• Update FloodwayZONE AE: Areas subject to inundation by the 1-percent-annual-chance flood event determined by
detailed methods. Base Flood Elevations (BFEs) are shown. Mandatory flood insurance purchase requirements and floodplain management standards apply.
ZONE A: Areas subject to inundation by the 1-percent-annual-chance flood event generally determined using approximate methodologies. Because detailed hydraulic analyses have not been performed, no Base Flood Elevations (BFEs) or flood depths are shown. Mandatory flood insurance purchase requirements and floodplain management standards apply.
Curr
ent
Effor
tFl
ood
Zone
sFl
oodw
ays
Deve
lop-
men
tTete Bayou Update & Mapping
Hist
ory
December 2006 Storm Event (5.0 inches)
July 2014 Storm Event (4.4 inches)
Curr
ent
Effor
tFl
ood
Zone
sFl
oodw
ays
Deve
lop-
men
tTete Bayou Update & Mapping
Hist
ory
Crochet Rd
Belle Place Olivier Rd
Mullins Rd
Emile Verret Rd
-10
-5
0
5
10
15
010,00020,00030,00040,00050,00060,000
Elev
ation
(ft-N
AVD8
8)
Main Channel Distance (ft)
Drainage Structures
Ground
Existing Conditions WSE (100-yr Storm)
FEMA BFE
100-year Existing Conditions - FEMA BFE Comparison
Curr
ent
Effor
tFl
ood
Zone
sFl
oodw
ays
Deve
lop-
men
tTete Bayou Update & Mapping
Hist
ory
Crochet Rd
Belle Place Olivier Rd
Mullins Rd
Emile Verret Rd
-10
-5
0
5
10
15
010,00020,00030,00040,00050,00060,000
Elev
ation
(ft-N
AVD8
8)
Main Channel Distance (ft)
Drainage Structures
Ground
Existing Conditions WSE (Dec 2006 Storm)
December 2006 Highwater Marks
December 30, 2006 Existing Conditions - High Water Marks Comparison
Curr
ent
Effor
tFl
ood
Zone
sFl
oodw
ays
Deve
lop-
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tTete Bayou Update & Mapping
Hist
ory
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EXISTING FEMA
Deve
lop-
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tTete Bayou Update & Mapping
Hist
ory
Floo
d Zo
nes
Floo
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t Eff
ort
PROPOSED FENSTERMAKER
Floo
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Tete Bayou Update & MappingHi
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Tete Bayou Update & MappingHi
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Floo
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Tete Bayou Update & MappingHi
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