Upload
jms400
View
282
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Citation preview
Experience · Innovation · Results
Drainage Assessment of Tete Bayou
Engineers ∙ Surveyors · Environmental Consultants
PRESENTED TO
IBERIA PARISHGOVERNMENT
CITY OF NEW IBERIA
Organizational ChartDr. Ehab Meselhe,
P.E.Senior Hydraulic
Engineering Consultant
Robert MillerMS, P.E.
Hydraulics Engineer
Justin Shaw M.S., E.I.
Hydraulics Engineer
Jeanne Arceneaux M.S., E.I.
Hydraulics Engineer
Dax Douet, P.E.Engineering Project
ManagerDirector
Ivan Diaz, P.E.Drainage Engineer for City of New
Iberia(33 Years)
Raymond Reaux, P.E.Vice President – Engineering
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
Study Area
4/XX
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.
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
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
FEMA Calibration
-10
-5
0
5
10
15
010,00020,00030,00040,00050,00060,000
Elev
atio
n (f
t)
Main Channel Distance (ft)
Existing 100-year Storm Event
Existing 100-yr WSE
Ground
FEMA BFE
Emile V
erret Rd
Mullins Rd
Belle Place Olivier Rd
Crochet Rd
CALIBRATION CHECKS
100-year Rainfall Event1% Chance that a 12.6 inch Rainfall over 24 hours will
Occur in a Given Year
December 2006 Storm Event Calibration
Tete Bayou at Belle Place Olivier Rd Facing South
Tete Bayou at Emile Verret Rd Facing WestTete Bayou at Emile Verret Rd Facing East
Tete Bayou near Candleglow Dr Facing East
Estimated Rainfall Event5.02” Rainfall (24 hours)
Approx. 3-yr., 24-hour Storm
December 2006 Storm Event Calibration
-10
-5
0
5
10
15
010,00020,00030,00040,00050,00060,000
Elev
atio
n (f
t)
Main Channel Distance (ft)
December 2006 Storm Event
December 2006 WSE
Ground
December 2006 High Water Mark
Emile V
erret Rd
Mullins Rd
Belle Place Olivier Rd
Crochet RdTete Bayou at Belle Place Olivier Rd Facing South
Scenario No. 1
11/XX
Definition:Channel Cleaning of Tete Bayou and the Pharr Canal
Scenario No. 1 – Water Surface Elevation Comparison
12/XX-10
-5
0
5
10
15
010,00020,00030,00040,00050,00060,000
Elev
atio
n (f
t)
Main Channel Distance (ft)
Existing - Scenario 1 Comparison
10-yr Existing WSE
10-yr Scenario 1 WSE
Ground
Emile V
erret Rd
Mullins Rd
Belle Place Olivier Rd
Crochet Rd
0.6’ Reduction inWater Surface Elevation
10-year Rainfall Event10% Chance that a 7.8 inch Rainfall over 24 hours will
Occur in a Given Year
Scenario No. 1 – Inundation Comparison
13/XX
Scenario No. 1 – Results
Scenario No. 1 Flood Duration Comparison
BridgeWater Surface Elevation > 7’ NAVD 88
Existing Scenario No. 1
Emile Verret Rd 24 hrs 15 hrs (37%)Belle Place Olivier Rd 18 hrs 12 hrs (33%)
Scenario No. 1 Inundation Area ComparisonExisting Conditions
10-yr Inundation Area (acres)
Scenario No. 1 10-yr Inundation
Area (acres)
Scenario No. 1 10-yr Reduction
Area (acres)
Scenario No. 1 10-yr Increase Area (acres)
Scenario No. 110-yr Total ReductionArea Reduction (acres)
6,390 6,366 220 197 24
Scenario No. 2
15/XX
Definition:Channel Cleaning, Widening of the Pharr Canal, and Removing Existing Spoil Banks Along Tete Bayou
16/XX-10
-5
0
5
10
15
010,00020,00030,00040,00050,00060,000
Elev
atio
n (f
t)
Main Channel Distance (ft)
Existing - Scenario 2 Comparison
10-yr Existing WSE
10-yr Scenario 2 WSE
Ground
Emile V
erret Rd
Mullins Rd
Belle Place Olivier Rd
Crochet Rd
Scenario No. 2 – Water Surface Elevation Comparison
0.6’ Reduction inWater Surface Elevation
Scenario No.2 – Inundation Comparison
17/XX
Scenario No. 2 – Results
Scenario No. 2 Flood Duration Comparison
BridgeWater Surface Elevation > 7’ NAVD 88
Existing Scenario No. 2
Emile Verret Rd 24 hrs 14 hrs (42%)Belle Place Olivier Rd 18 hrs 12 hrs (33%)
Scenario No. 2 Inundation Area ComparisonExisting Conditions
10-yr Inundation Area (acres)
Scenario No. 2 10-yr Inundation
Area (acres)
Scenario No. 2 10-yr Reduction
Area (acres)
Scenario No. 2 10-yr Increase Area (acres)
Scenario No. 210-yr Total ReductionArea Reduction (acres)
6,390 6,209 289 108 181
Scenario No. 3
19/XX
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
20/XX-10
-5
0
5
10
15
010,00020,00030,00040,00050,00060,000
Elev
atio
n (f
t)
Main Channel Distance (ft)
Existing - Scenario 3 Comparison
10-yr Existing WSE
10-yr Scenario 3 WSE
Ground
Emile V
erret Rd
Mullins Rd
Belle Place Olivier Rd
Crochet Rd
Diversion
Scenario No. 3 – Water Surface Elevation Comparison
1.7’ Reduction inWater Surface Elevation
Scenario No. 3 – Inundation Comparison
21/XX
Scenario No. 3 – Results
Scenario No. 3 Flood Duration Comparison
BridgeWater Surface Elevation > 7’ NAVD 88
Existing Scenario No. 3
Emile Verret Rd 24 hrs 5 hrs (79%)Belle Place Olivier Rd 18 hrs 10 hrs (44%)
Scenario No. 3 Inundation Area ComparisonExisting Conditions
10-yr Inundation Area (acres)
Scenario No. 3 10-yr Inundation
Area (acres)
Scenario No. 3 10-yr Reduction
Area (acres)
Scenario No. 3 10-yr Increase Area (acres)
Scenario No. 310-yr Total ReductionArea Reduction (acres)
6,390 5,835 619 64 555
Scenario No. 4
23/XX
Definition:Channel Cleaning and Pharr Canal Diversion
24/XX-10
-5
0
5
10
15
010,00020,00030,00040,00050,00060,000
Elev
atio
n (f
t)
Main Channel Distance (ft)
Existing - Scenario 4 Comparison
10-yr Existing WSE
10-yr Scenario 4 WSE
Ground
Emile V
erret Rd
Mullins Rd
Belle Place Olivier Rd
Crochet Rd
Diversion
Scenario No. 4 – Water Surface Elevation Comparison
1.5’ Reduction inWater Surface Elevation
Scenario No. 4 – Inundation Comparison
25/XX
Scenario No. 4 – Results
Scenario No. 4 Flood Duration Comparison
BridgeWater Surface Elevation > 7’ NAVD 88
Existing Scenario No. 4
Emile Verret Rd 24 hrs 9 hrs (62%)Belle Place Olivier Rd 18 hrs 10 hrs (44%)
Scenario No. 4 Inundation Area ComparisonExisting Conditions
10-yr Inundation Area (acres)
Scenario No. 4 10-yr Inundation
Area (acres)
Scenario No. 4 10-yr Reduction
Area (acres)
Scenario No. 4 10-yr Increase Area (acres)
Scenario No. 410-yr Total ReductionArea Reduction (acres)
6,390 5,977 463 50 414
Scenario Comparisons and Costs
Scenario
Flood Duration Reduction at Emile Verret
Flood Duration Reduction at
Belle Place Olivier
Inundation Reduction
Area
Inundation Increase
Area
Total Planning
Cost*(hrs) (hrs) (acres) (acres)No. 1 9 6 220 197 $1,177,000No. 2 10 6 289 108 $1,964,000No. 3 19 8 619 64 $6,416,000No. 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.
Additional Analysis – Dredge Tete Bayou Mouth
-10
-5
0
5
10
15
010,00020,00030,00040,00050,00060,000
Elev
atio
n (f
t)
Main Channel Distance (ft)
Dredging Tete Bayou
10-yr Existing WSE
Existing Ground
Dredged 10-yr WSE
Dredged Ground
Emile V
erret Rd
Mullins Rd
Belle Place Olivier Rd
Crochet Rd
Definition:Dredging of Tete Bayou into Lake Fausse Pointe
Negligible Water Surface Elevation Change
Experience · Innovation · Results
Drainage Assessment of Tete Bayou
Engineers ∙ Surveyors · Environmental Consultants
Visit Our Website at www.fenstermaker.com