1. Development of a Geographic Framework for an Integrated Flood Modeling System Oscar Robayo Tim Whiteaker August 10, 2004 University of Texas at Austin Center for Research in Water Resources Department of Civil Engineering By

2. Regional Storm Water Modeling Program and Master Plan for San Antonio City of San Antonio

3. Modeling System Rainfall Data: Rain gages Nexrad Calibration Data: Flows Water Quality Geospatial Data: City, County SARA, other Floodplain Management Integrated Regional Water Resources planning Capital Improvement Planning Flood Forecasting Water quality planning San Antonio Regional Watershed Modeling System “Bring the models together”

4. Arc Hydro Data Model: A Geodatabase containing a GIS representation of a Hydrological Information System under a case-specific database design

5. Geographically Integrated Flood Information System Interface Data Models HEC-HMS HEC-RAS Flood Impact Analysis GIS Geo Database Arc Hydro data model Engineering Models

6. Objectives Develop a geographically integrated flood modeling system using ArcGIS and the HEC models using Salado Creek in San Antonio as a case study Drive this system with digital rain maps to generate flood maps Store and generate HEC flood models from an ArcGIS geodatabase Develop a scenario management system to generate and evaluate flood design alternatives

7. Bringing Models Together: Long Time Goal (Feldman, Advances in Hydroscience, Vol.12. Orlando, Fl, Academic Press, 1981)

8. Historical NEXRAD data – NWS and TNRIS archive Historical NEXRAD data – NWS and TNRIS archive Real-time NEXRAD data - web portal services Real-time NEXRAD data - web portal services Forecast Data – NWS QPF Forecast Data – NWS QPF Design rainfall maps – 2, 5, 10, 25, 50, 100 year design rainfalls as used for FEMA floodplain studies Design rainfall maps – 2, 5, 10, 25, 50, 100 year design rainfalls as used for FEMA floodplain studies Sources of Rainmap data

9. NEXRAD WSR-88D Radars in Central Texas (Weather Surveillance Radar-1988 Doppler) scanning range = 230 km Stage I: Just Radar Stage II: gages, satellite, and surface temperature Stage III: Continuous mosaic from radar overlaps NEXRAD Products: Source: PBS&J, 2003 EWX – NEXRAD radar in New Braunfels

10. Reading Historical Archives of NEXRAD Datasets from Internet FTP Server Local Internet

11. Real-Time NEXRAD Datasets from Web Services

12. Design Rainfall Maps 100yr 24h 100yr 06h 100yr 12h

13. Seamless End-to-End Floodplain Modeling Radar Precip Estimates (historic & real time) Flood Inundation Mapping

14. Seamless End-to-End Floodplain Modeling Design Rainfall Maps Flood Inundation Mapping 100yr 24h

15. Remapping Floodplain Boundaries Storm Frequency Analysis Watershed Land Use Configurations Floodplain Configurations Wildfire Events Urban Sprawl Agricultural Expansion Channel Modifications Bridges, Culverts, Weirs Reservoirs, Levees, Dikes Storm water systems Land Use Changes Longer Records New Extreme Events

16. Case Study: The San Antonio River Basin Source: PBS&J, 2003

17. Regional Watershed Modeling System Case Study Rosillo Creek watershed Arc Hydro Geodatabase for whole watershed HEC-HMS hydrology model for whole watershed HEC-RAS hydraulic model for Rosillo Creek Salado Creek watershed Components: Bexar County

18. Integration of Components “A Flood Simulation and Information System that will streamline the simulation process of all the relevant model components” Integration of: data acquisition systems Hydrologic and Hydraulic modeling systems Floodplain delineation routines Flood Impact Analysis

19. Arc Hydro and HEC-HMS Arc Hydro Schematic Network HEC-HMS Hydrologic Model Calculates Flows

20. Arc Hydro and HEC-RAS Arc Hydro Channel Cross Sections HEC-RAS Hydraulic Model Calculates Water Surface Elevations

21. Information Flow HEC-HMS HEC-RAS Rainfall Runoff Streamflow Water Surface Elevations 4 2 3 1

22. Flow Change Points

23. HEC Data Storage System (DSS) (binary data file system shared by HEC models) An exact replica of the binary DSS files is stored in the ArcGIS geodatabase An exact replica of the binary DSS files is stored in the ArcGIS geodatabase An Arc 9 Toolbox exchanges data between DSS and the geodatabase An Arc 9 Toolbox exchanges data between DSS and the geodatabase Time series catalog Many time series

24. NEXRAD Map to Flood Map in Arc 9 Model Builder FLO ODP LAIN MAP Flood map as output Model for flood flow Model for flood depth HMS NEXRAD rainfall map as input

25. Map2Map Workflow for FTP Ingest

26. Map2Map Workflow for Design Storms

27. Conclusions Model Integration Geographic Integration Arc Hydro and Interface Data Models Information Exchange Points Data Bridges Implemented in Arc 9.0 ModelBuilder Adaptable for ingestion of historic, real time, forecast, and design precipitation inputs

28. Map to Map Demo