Tete bayou openhousemeeting_021215

Tete Bayou Update & Mapping

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Tete Bayou

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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

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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

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Drainage Area = 27.8 SQ. MI.Channel Length = 10.3 MI.

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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

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Crochet Rd

Belle Place Olivier Rd

Mullins Rd

Emile Verret Rd

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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

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• 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.

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December 2006 Storm Event (5.0 inches)

July 2014 Storm Event (4.4 inches)

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Crochet Rd


Mullins Rd

Emile Verret Rd

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Ground

Existing Conditions WSE (100-yr Storm)

FEMA BFE

100-year Existing Conditions - FEMA BFE Comparison

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Crochet Rd


Mullins Rd

Emile Verret Rd

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Ground

Existing Conditions WSE (Dec 2006 Storm)

December 2006 Highwater Marks

December 30, 2006 Existing Conditions - High Water Marks Comparison

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Tete Bayou Update & MappingHi

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PROPOSED FENSTERMAKER

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Engineering

Tete bayou openhousemeeting_021215