The GCCPRD Storm Surge Suppression Study of the Upper Texas Coast

Jeff Scarborough and Chris Sallese - Dannenbaum Engineering Corporation

Transcript

1. 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
2. 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. The GCCPRD is a local government corporation governed by a Board of Directors comprised of the County Judge of each participating county and three additional appointed members serving three terms. Former Harris County Judge Robert Eckels was appointed by the Board to serve as President of the District.
3. 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? ¨  How do we finance the final project?
4. What is the Threat? Defined the threat by modeling the physics and hydraulic loads of potential storms. ¨  Models: ADCIRC, STWAVE, HEC-RAS, HEC-FDA
5. ADCIRC Modeling FWOA Results Surge tracked at central reference location. Project Max Surge Elevation (ft, NAVD88) Project less FWOA (ft) Project less H10 (ft) Project less H17 (ft) Storm 026 036 026 036 026 036 026 036 FWOA 14.6 19.5 Max Surge Elevation Storm 026 Storm 036
6. Project Max Surge Elevation (ft, NAVD88) Project less FWOA (ft) Project less H10 (ft) Project less H17 (ft) Storm 026 036 026 036 026 036 026 036 FWOA 14.6 19.5 H10 10.0 15.3 -4.5 -4.2 H17 6.1 10.4 -8.5 -9.1 -3.9 -4.9 H22 6.1 7.9 -8.5 -11.6 -3.9 -7.4 0.0 -2.5 H22 Results Surge tracked at central reference location. - Comparison of H22 and H17 Difference plot compares surge elevations with H22 to surge elevations with H17. Blue color represents a lower surge with H22 than with H17. H22 Max Surge Elevation ADCIRC Modeling Storm 026 Storm 036 H22 less H17
7. 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 5 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 ¤  Regional economy linked to all of Texas, the national economy and to national security
8. 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
9. How do we finance the final project? Federal Funds: ¨  Traditional path to project authorization and appropriation (costs share 65-35) ¨  Seek special legislation… New Orleans State Funds: ¨  General revenue ¨  Special taxing districts ¨  Revenue bonds ¨  Private investment ¨  Public-Private Partnership
10. x3 Phases ¨  Phase 1: Data Collection – Complete ¨  Phase 2: Mitigation Technical Study – February 2016 ¨  Phase 3: Final Report and Recommendation – June 2016
11. Phase 1 – Critical Activities Completed ¨  Defined the Threat and Need for the surge protection ¨  Reviewed existing data and technical alternatives ¨  Assembled the Data Library… Readied to pass to GLO ¨  Reviewed similar international projects and structures ¨  Developed alternative screening criteria ¤  Alternatives must reduce risk and impacts associated with surge and coastal flooding to: n  People n  Infrastructure n  Environment n  Regional and National Economy ¤  Alternatives must be in compliance with Local, State and Federal regulations
12. Phase 1 – Critical Activities Completed ¨  Developed alternative evaluation criteria ¤  Technical feasibility ¤  Environmental feasibility ¤  Social feasibility ¨  Developed decision criteria ¤  Public acceptance ¤  Flexibility, adaptability and resilience ¤  Extended economic benefits ¨  GIS Portal ¨  Developed a list of potential alternatives by study region ¨  Phase I Report is available at http://www.gccprd.com/
14. Phase 2 – Critical Activities Underway ¨  AD-CIRC Modeling ¤  Establish baseline surge elevations for the region ¨  HEC-FDA Economic Modeling ¤  Establish baseline regional economic conditions ¨  Refine HEC-RAS drainage models ¨  Alternative development ¨  Stakeholder engagement
15. Potential Alternatives
16. Potential Alternatives Northern Alternatives Southern Alternatives Central Alternatives
17. Study End State A defined suite of alternatives based on sound technical and economic analysis that creates an integrated protection system that reduces risk to the public, the economy and the environment within the six-county study region.
18. Applied GIS and Technologies ¨  Public Information Website ¨  ProjectWise Data Library – Document Controls System ¨  GIS Web Portal ¨  GIS Analysis and GIS Exhibits
19. Public Information Website ¨  Tip of the outreach spear ¨  http://www.gccprd.com/
20. Data Library – Data Collection (~450 datasets) Sources Types
21. Data Library – Document Control and Access ¨  ProjectWise Internet based document upload tool ¨  Developed custom index tool to automate data cataloging during uploads ¤  SQL Server application with Excel front end ¤  Forces uploader to fill out metadata form ¤  Excel Index updates during every create, delete and edit ¤  Index is posted on the Public Information Website
22. Data Library – Custom Index Tool ¨  Type – Data Categories such as CAD, Document, GIS and Model ¨  Application – Software application of the data files ¨  Name – File Name ¨  Description – Description of the data files ¨  Notes – Additional data description information ¨  Publication Date – Date of data publications by sources ¨  Publication Source – Names of source public agencies and private stakeholders ¨  Publication Address – Addresses of source contacts ¨  Publication Phone – Phone numbers of source contacts ¨  Acquisition Contact – Names of individuals who acquired the data files ¨  Location – Hyperlinks to file locations in the Data Library
23. Data Library – Document Navigation
24. Data Library – Available to Public
25. GIS Web Portal ¨  SQL Server (2012) Database ¨  ArcGIS Server 10.2.2 ¨  Esri Javascript API ¨  CMV Map Template - community-supported open source mapping framework ¤  https://github.com/cmv/ cmv-app ¨  ArcGIS Online Basemap ¨  Future Additions: ¤  Alternatives and Cost Data ¤  Before and After Map Swipe
26. GIS Web Portal Basic Functionality: ¨  Study area map ¨  Legend describing map symbols ¨  Map layers “On” and “Off” ¨  Bookmarks to automatically zoom to predefined regions ¨  Find property locations by owners names (within study area only) ¨  Measure distances between features on the map ¨  Automated map exhibit printing ¨  https://gis.dannenbaum.com/pub- gccprd/
27. GIS Exhibits – Phase I
28. Q&A Presented by: Chris Sallese, PMP Coastal Programs Director Chris.Sallese@Dannenbaum.com Jeff Scarborough Special Projects Division Manager Jeff.Scarborough@Dannenbaum.com