The document provides a drainage assessment and analysis of four proposed drainage improvement scenarios for Tete Bayou in Iberia Parish, Louisiana. It summarizes the project objectives, data collection process, development of numerical models, and findings from analyzing the existing conditions and Scenarios 1 and 2. Scenario 1 involves channel cleaning of Tete Bayou and Pharr Canal, while Scenario 2 adds widening of the Pharr Canal intake and removing spoil banks along Tete Bayou. Both scenarios showed reductions in water surface elevation and flood inundation area compared to existing conditions.

1. Drainage Assessment of Tete Bayou
Experience · Innovation · Results
PRESENTED TO
IBERIA PARISH CITY OF
GOVERNMENT NEW IBERIA
Engineers ∙ Surveyors · Environmental Consultants

2. Organizational Chart
Dr. Ehab Meselhe,
P.E.
Senior Hydraulic
Engineering
Consultant
Raymond Reaux, P.E.
Vice President – Engineering
Jeanne Arceneaux Robert Miller
M.S., E.I. MS, P.E.
Hydraulics Engineer Hydraulics Engineer
Dax Douet, P.E.
Engineering Project
Manager
Director
Justin Shaw
M.S., E.I. Ivan Diaz, P.E.
Drainage Engineer for City of New
Hydraulics Engineer Iberia
(33 Years)

3. General Scope of Work
• INVESTIGATE HISTORICAL FLOODING IN UPPER
PORTION OF TETE BAYOU
• EXAMINE REPETIVE LOSSES DUE TO OVERBANK
FLOODING
• DEVELOP POSSIBLE DRAINAGE IMPROVEMENT
SCENARIOS
• PERFORM FIELD SURVEYING
• ANALYZE IMPROVEMENT SCENARIOS THROUGH
HYDROLOGIC AND HYDRAULIC MODELS
• PRESENT QUANTITATIVE SOLUTIONS ALONG
WITH REPORT

4. Study Area
4/XX

5. Project Objectives
• Develop Numerical Models to Study Tete Bayou and Pharr Canal
• Examine Four Proposed Drainage Improvement Scenarios:
Scenario No. 1: Cleaning of Tete Bayou and the Pharr Canal;
Scenario No. 2: Scenario No. 1 + widening of the Pharr Canal intake, and removing
existing spoil banks along Tete Bayou;
Scenario No. 3: Scenario No. 2 + diverting flow from Tete Bayou to Bayou Teche
through a sub-surface box culvert system; and
Scenario No. 4: Scenario No. 1 + widening of Pharr Canal.

6. Analysis Timeline
• Contract Execution Date: January 19, 2011
• Field Survey Collection Start Date: February 8, 2011
• Numerical Model Development Start: February 21, 2011
• Agency Meeting with City and Parish Date: April 5, 2011
• Draft Report to City and Parish Date: July 22, 2011

7. Data Collected
• Survey Date Collected By C.H.
Fenstermaker & Associates, Inc.
• 1,589 Survey Points Collected
• Historical Hydrologic Data
• Land Use/Land Cover Maps
• Soil Type Maps
• LiDAR Data
• FEMA Flood Zones

8. FEMA Calibration
Existing 100-year Storm Event
15
10 CALIBRATION
CHECKS
Emile Verret Rd
Mullins Rd
Belle Place Olivier Rd
5
Elevation (ft)
Crochet Rd
0
100-year Rainfall Event
1% Chance that a 12.6 inch
-5 Rainfall over 24 hours will
Occur in a Given Year
Existing 100-yr WSE
Ground
FEMA BFE
-10
60,000 50,000 40,000 30,000 20,000 10,000 0
Main Channel Distance (ft)

9. December 2006 Storm Event Calibration
Tete Bayou at Belle Place Olivier Rd Facing South Tete Bayou near Candleglow Dr Facing East
Tete Bayou at Emile Verret Rd Facing East Tete Bayou at Emile Verret Rd Facing West
Estimated Rainfall Event
5.02” Rainfall (24 hours)
Approx. 3-yr., 24-hour Storm

10. December 2006 Storm Event Calibration
December 2006 Storm Event
15
10
Emile Verret Rd
Mullins Rd
Belle Place Olivier Rd
5
Elevation (ft)
Crochet Rd
0
Tete Bayou at Belle Place Olivier Rd Facing South
-5
December 2006 WSE
Ground
December 2006 High Water Mark
-10
60,000 50,000 40,000 30,000 20,000 10,000 0
Main Channel Distance (ft)

11. Scenario No. 1
Definition:
Channel Cleaning of Tete
Bayou and the Pharr Canal
11/XX

12. Scenario No. 1 – Water Surface Elevation Comparison
Existing - Scenario 1 Comparison
15
0.6’ Reduction in
Water Surface Elevation
10
Emile Verret Rd
Mullins Rd
Belle Place Olivier Rd
5
Elevation (ft)
Crochet Rd
0
10-year Rainfall Event
10% Chance that a 7.8 inch
Rainfall over 24 hours will
-5
Occur in a Given Year
10-yr Existing WSE
10-yr Scenario 1 WSE
Ground
-10 12/XX
60,000 50,000 40,000 30,000 20,000 10,000 0
Main Channel Distance (ft)

13. Scenario No. 1 – Inundation Comparison
13/XX

14. Scenario No. 1 – Results
Scenario No. 1 Inundation Area Comparison
Existing Conditions Scenario No. 1 Scenario No. 1 Scenario No. 1 Scenario No. 1
10-yr Inundation Area 10-yr Inundation 10-yr Reduction 10-yr Increase 10-yr Total Reduction
(acres) Area (acres) Area (acres) Area (acres) Area Reduction (acres)
6,390 6,366 220 197 24
Scenario No. 1 Flood Duration Comparison
Water Surface Elevation > 7’ NAVD 88
Bridge
Existing Scenario No. 1
Emile Verret Rd 24 hrs 15 hrs (37%)
Belle Place Olivier Rd 18 hrs 12 hrs (33%)

15. Scenario No. 2
Definition:
Channel Cleaning, Widening of the
Pharr Canal, and Removing Existing
Spoil Banks Along Tete Bayou
15/XX

16. Scenario No. 2 – Water Surface Elevation Comparison
Existing - Scenario 2 Comparison
15
0.6’ Reduction in
Water Surface Elevation
10
Emile Verret Rd
Mullins Rd
Belle Place Olivier Rd
5
Elevation (ft)
Crochet Rd
0
-5
10-yr Existing WSE
10-yr Scenario 2 WSE
Ground
-10 16/XX
60,000 50,000 40,000 30,000 20,000 10,000 0
Main Channel Distance (ft)

17. Scenario No.2 – Inundation Comparison
17/XX

18. Scenario No. 2 – Results
Scenario No. 2 Inundation Area Comparison
Existing Conditions Scenario No. 2 Scenario No. 2 Scenario No. 2 Scenario No. 2
10-yr Inundation Area 10-yr Inundation 10-yr Reduction 10-yr Increase 10-yr Total Reduction
(acres) Area (acres) Area (acres) Area (acres) Area Reduction (acres)
6,390 6,209 289 108 181
Scenario No. 2 Flood Duration Comparison
Water Surface Elevation > 7’ NAVD 88
Bridge
Existing Scenario No. 2
Emile Verret Rd 24 hrs 14 hrs (42%)
Belle Place Olivier Rd 18 hrs 12 hrs (33%)

19. Scenario No. 3
Definition:
Channel Cleaning, Widening of the
Pharr Canal, Removing Spoil
Banks, and Diverting Flow From
Tete Bayou to Bayou Teche Through
a Sub-surface Box Culvert System
19/XX

20. Scenario No. 3 – Water Surface Elevation Comparison
Existing - Scenario 3 Comparison
15
1.7’ Reduction in
Emile Verret Rd Water Surface Elevation
10
Mullins Rd
Belle Place Olivier Rd
5
Elevation (ft)
Crochet Rd
Diversion
0
-5
10-yr Existing WSE
10-yr Scenario 3 WSE
Ground
-10 20/XX
60,000 50,000 40,000 30,000 20,000 10,000 0
Main Channel Distance (ft)

21. Scenario No. 3 – Inundation Comparison
21/XX

22. Scenario No. 3 – Results
Scenario No. 3 Inundation Area Comparison
Existing Conditions Scenario No. 3 Scenario No. 3 Scenario No. 3 Scenario No. 3
10-yr Inundation Area 10-yr Inundation 10-yr Reduction 10-yr Increase 10-yr Total Reduction
(acres) Area (acres) Area (acres) Area (acres) Area Reduction (acres)
6,390 5,835 619 64 555
Scenario No. 3 Flood Duration Comparison
Water Surface Elevation > 7’ NAVD 88
Bridge
Existing Scenario No. 3
Emile Verret Rd 24 hrs 5 hrs (79%)
Belle Place Olivier Rd 18 hrs 10 hrs (44%)

23. Scenario No. 4
Definition:
Channel Cleaning and Pharr Canal
Diversion
23/XX

24. Scenario No. 4 – Water Surface Elevation Comparison
Existing - Scenario 4 Comparison
15
1.5’ Reduction in
Water Surface Elevation
10
Emile Verret Rd
Diversion
Belle Place Olivier Rd
Mullins Rd
5
Elevation (ft)
Crochet Rd
0
-5
10-yr Existing WSE
10-yr Scenario 4 WSE
Ground
-10 24/XX
60,000 50,000 40,000 30,000 20,000 10,000 0
Main Channel Distance (ft)

25. Scenario No. 4 – Inundation Comparison
25/XX

26. Scenario No. 4 – Results
Scenario No. 4 Inundation Area Comparison
Existing Conditions Scenario No. 4 Scenario No. 4 Scenario No. 4 Scenario No. 4
10-yr Inundation Area 10-yr Inundation 10-yr Reduction 10-yr Increase 10-yr Total Reduction
(acres) Area (acres) Area (acres) Area (acres) Area Reduction (acres)
6,390 5,977 463 50 414
Scenario No. 4 Flood Duration Comparison
Water Surface Elevation > 7’ NAVD 88
Bridge
Existing Scenario No. 4
Emile Verret Rd 24 hrs 9 hrs (62%)
Belle Place Olivier Rd 18 hrs 10 hrs (44%)

27. Scenario Comparisons and Costs
Flood Duration Flood Duration Inundation Inundation Total
Reduction at Reduction at Reduction Increase Planning
Scenario
Emile Verret Belle Place Olivier Area Area
(hrs) (hrs) (acres) (acres) Cost*
No. 1 9 6 220 197 $1,177,000
No. 2 10 6 289 108 $1,964,000
No. 3 19 8 619 64 $6,416,000
No. 4 15 8 463 50 $2,641,000
* It should be noted that these figures represent approximated cost only to be used for planning purposes.

28. Additional Analysis – Dredge Tete Bayou Mouth
Dredging Tete Bayou
15
Definition:
Dredging of Tete Bayou into Lake
Fausse Pointe
10
Emile Verret Rd
Mullins Rd
Belle Place Olivier Rd
5
Elevation (ft)
Crochet Rd
Negligible Water Surface
0
Elevation Change
-5
10-yr Existing WSE
Existing Ground
Dredged 10-yr WSE
Dredged Ground
-10
60,000 50,000 40,000 30,000 20,000 10,000 0
Main Channel Distance (ft)

29. Drainage Assessment of Tete Bayou
Experience · Innovation · Results
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