Evacuation Safety Planners * Jason HaycockRobert Broussard Colleen Grentz Project Manager Analyst & Webmaster Analyst & Project Designer

Floodplain and Evacuation Network Analysis of the San Marcos, Texas Extraterritorial Jurisdiction

Presentation Summary Introduction & Objectives Data Software Methodology Timeline Research & Results Budget Final Deliverables Conclusion

Introduction: Background on project –Two floods in the past 10 years where water levels have surpassed the 500 year floodplain Floodplain management –FEMA definition Objectives for this project were arrived upon through correspondence with the City of San Marcos

ESP’s Objectives ESP’s Objectives: Determine low water crossings Locate potential flood risk areas Designate various emergency shelters Determine evacuation routes from hazardous locations Evaluate mobility of at risk citizens

Scope: This study will cover the City of San Marcos, Texas and the associated Extraterritorial Jurisdiction up to and including the city expansion according to the Master Plan.

Data Sources City of San Marcos, Texas FEMA US Census Bureau USGS

Data Files FEMA 100 Year & 500 Year Floodplains October 1998 Flood Line October 1998 Damage Assessment Table Centerline Road Network Extraterritorial Jurisdiction Land Parcels Current Infrastructure

Data Files One Way Roads Rivers US Census Data City of San Marcos Master Plan Elevation –Contours –DEM

Data Description Projection: –Texas State Plane Coordinate System –NAD 1983 Texas South Central Zone Metadata: –Compiled using Federal Geographic Data Committee Standards All Data and Metadata to be made available to client upon project completion

Software Microsoft Excel –Tabular data formation ESRI ArcGIS 9 –ArcMap 9.1 Network Analyst Spatial Analyst –ArcCatolog 9.1 Data Management Metadata

Methodology Risk Assessment –Evaluate Floodplains October 1998 Flood Line –Assign October 1998 Damage Assessment Table Data to Land Parcels –Estimate mobility based on US Census Demographics

Methodology Evacuation Network Analysis –Determine Low Water Crossings –Designate Adequate Emergency Shelters –Consider Relative Barriers & Detours –Develop Emergency Routes

Methodology Forecast –Propose Alternate Shelters & Evacuation Routes based on the City of San Marcos Master Plan –Account for future growth in Population, Infrastructure, & Extraterritorial Jurisdiction

Projected Timeline Week Dates Sept. 25th Oct. 2nd Oct. 9th Oct. 16th Oct. 23rd Oct. 30th Nov. 6th Nov. 13th Nov. 20th Nov. 27th Data Collection Data Processing Data Analysis Interpretation Deliverables and Review

Analysis Participation Jason Haycock –Evacuation network analysis –Metadata formation Colleen Grentz –Floodplain and flood line analysis –Determination of low water crossings Robert Broussard –Risk assessment analysis –Determination of emergency shelters

Proposed Research: Couple FEMA data & San Marcos Flood Data, circa 1998 in order to produce map products which will show all: –Potential flood areas in & around San Marcos –Low water crossings in the San Marcos ETJ

Proposed Research (cont.) : Develop evacuation routes which: –Lead evacuees to primary & secondary shelters (balance capacity & locations) –Will detour evacuees safely around low water crossings on their way to shelters

San Marcos Low Water Crossing

Proposed Research (cont.) : Produce an analysis of Year 2000 Census and San Marcos tax appraisal data to: –Highlight areas where individuals may need help in reaching the shelters Maps: Clear, Easily Understood, Based on Current data, & the Evacuation Maps be Key Contributors to an Efficient and Safe Evacuation under emergency conditions

Deliverables: Multiple copies of CD’s containing: –Project in Your preferred GIS format –All data & maps developed for this project –Metadata for all layers in the project –Written report (2 copies, unless requested otherwise) –Professional, gloss finished poster

Proposed Budget: Data Collection ‘$570 Data Analysis $10,650 Systems Management ‘ $3,000 Equipment $10,756 Software License $1, Total Proposed $26,726

Conclusion Conclusion: Upon completion of this project, ESP aims to discover valuable information that will allow the City of San Marcos, Texas to understand more thoroughly the potential flooding areas, where shelters should be placed in relation and evacuation routes to these safe havens.

Questions?