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TRANSCRIPT
The GCCPRD Storm Surge Suppression
Study for the Upper Texas Coast
Presented by:
Chris Sallese, PMP
Coastal Programs Director
Jeff Scarborough
Special Projects Division Manager
Tony Duerkop, GISP
Senior GIS Analyst
Gulf Coast Community Protection and
Recovery District (GCCPRD)
GCCPRD was formed to
help Brazoria,
Chambers, Galveston,
Harris, Jefferson, and
Orange counties
develop plans and
conduct studies to
alleviate damage from
events like Hurricane Ike.
Methodology
To define flood risk management and surge suppression
requirements within the region through a technical analysis of
potential alternatives.
What is the threat?
What needs to be protected?
How will protect?
What is the Threat?
Defined the threat by modeling the physics and hydraulic loads
of potential storms in 2035 and 2085 factoring in projected
relative sea level rise.
Models: ADCIRC, STWAVE, HEC-RAS, HEC-FDA
What needs to be protected?
Define the level of safety for people, the economy and the
environment through extensive modeling of storms, economic data,
and assessment of environmental impacts.
Study area facts:
Population of over 6 million people and growing
America’s largest concentration of energy, petrochemical and refining industries
Commercial Navigation System of channels and ports linked to the world economy
Home to NASA
Booming fisheries and tourism industry
Coastal estuary system of national significance
Accounts for 31% of Texas’ $1.4 trillion GDP
How will we protect?
Develop and integrate storm surge and flood defense system through the
evaluation of technical structural and non-structural alternatives.
Compare the cost of technical solutions to economic losses prevented to
determine the Benefit-to-Cost Ratio (BCR) for alternative
Estimation of Costs
Production of volume of material
needed for levees.
Spatial Analyst (Cut/Fill, Map
Algebra) tools to create volumes
Location of closure structures (roads
crossings, stream crossings) and
floodwall.
HEC-FDA Damage Reaches
Damage Reaches
County boundaries, physical
landscape features, and clusters of
development were considerations.
Structure Inventory
Utilize Assessor Information and FEMA
Occupancy Codes to created a
standardized inventory overall 5
counties.
North Region Alternative
North Region Alternative Summary and Comparison NR#2 - The Jefferson/Orange Protection
System –without the Neches River
Navigation Gate
Total length of the system (miles) 92.2 miles
Right of way required 1,401 acres
Pump stations required / total capacity (CFS) 14 / 31,626 CFS
Environmental mitigation required 559.6 acres
Construction cost $3,228,580,000
Annual Operations and maintenance cost $16,143,000
Total Annual Costs (TAC) 176,910,000
Total Annual Benefits (TAB) $140,877,000
Benefit - Cost Ratio (TAB/TAC) (3.125% Interest Rate) 0.80
North Region Surge Reduction 100-Year Event
in 2085
2085 Future Without Action 2085 North Region Alternative
Central Region Alternative
Central Region Alternative Summary and Comparison CR#1 - High Island to San Luis Pass
Coastal Spine
Total length of the system (miles) 55.6 miles
Right of way required 1,220 acres
Pump stations required / total capacity (CFS) 0 / 0 CFS
Environmental mitigation required 303.35 acres
Construction cost $5,832,095,000*
Annual operations and maintenance cost $29,160,000
Total Annual Costs (TAC) 319,569,000
Total Annual Benefits (TAB) $1,029,399,000
Benefit - Cost Ratio (TAB/TAC) (3.125% Interest Rate) 3.22
Central Region Surge Reduction 100-Year Event
in 2085
2085 Future Without Action 2085 Central Region Alternative
South Region Alternative
South Region Alternative Summary and Comparison SR#2- Freeport Hurricane Flood Protection
System Modernization and Extension
North toward Angleton- Jones Creek
Levee, Jones Creek Terminal Ring Levee,
and Chocolate Bayou Ring Levee
Total length of the system (miles) 74.2 miles
Right of way required 383 acres
Pump stations required / total capacity (CFS) 5 / 11,460 CFS
Environmental mitigation required 129.89 acres
Construction cost $2,571,551,000
Annual operations and maintenance cost $12,858,000
Total Annual Costs (TAC) 140,907,000
Total Annual Benefits (TAB) $206,654,000
Benefit - Cost Ratio (TAB/TAC) (3.125% Interest Rate) 1.47
South Region Surge Reduction 100-Year Event
in 2085
2085 Future Without Action 2085 South Region Alternative
Applied GIS and Technologies
GIS Web Portal
ArcGIS Online (AGOL)
ProjectWise Data Library – Document Controls System
GIS Analysis and GIS Exhibits
Estimation of costs.
Produce volume for amount of material needed for levees.
Development of locations of closure structures (roads crossings and stream crossings)
Development of Benefit-to-Cost Ratios
Damage Reaches
Structure Inventory
GIS Web Portal
SQL Server (2012) Database
ArcGIS Server 10.3.1
Esri Javascript API
CMV Map Template - A
community-supported open
source mapping framework
built with the Esri JavaScript
API and the Dojo Toolkit
https://github.com/cmv/cmv-app
AGOL Websites
Story Map with Embedded Swipe
Maps comparing Surge Modeling
scenarios
Story Map displaying the
proposed alternatives
AGOL Storm Surge Website
AGOL GCCPRD Alternatives
Data Library – Available to Public
Website Links
http://www.gccprd.com/
https://gis.dannenbaum.com/gccprd-surge/
https://gis.dannenbaum.com/gccprd-alternatives/
https://gis.dannenbaum.com/pub-gccprd/
https://gis.dannenbaum.com/gccprddownload
Q&A
Presented by:
Chris Sallese, PMP
Coastal Programs Director
Jeff Scarborough
Special Projects Division Manager
Tony Duerkop, GISP
Senior GIS Analyst