Integrating ArcHydro and HEC Models by David R Integrating ArcHydro and HEC Models by David R. Maidment Center for Research in Water Resources University of Texas at Austin Arc Hydro and hydrologic models Interface Data Model for HEC-HMS Implementation in San Antonio using Model Builder

Integrating Arc Hydro and HEC Models Arc Hydro and hydrologic models Interface Data Model for HEC-HMS Implementation in San Antonio using Model Builder

Hydrologic Information System Modeling Geodatabase A hydrologic information system is a combination of geospatial and temporal hydrologic data with hydrologic models that supports hydrologic practice, science and education

GIS Preprocessors for Hydrologic Models Interface Programs HMS Geo HMS Database RAS Geo RAS

Connecting Arc Hydro and Hydrologic Models GIS Interface data models HMS HMS IDM Geo Database Arc Hydro data model RAS RAS IDM

Connecting Arc Hydro and Hydrologic Models GIS Interface data models HMS HMS IDM GeoHMS Geo Database Arc Hydro data model GeoRAS RAS RAS IDM

Integrating Arc Hydro and HEC Models Arc Hydro and hydrologic models Interface Data Model for HEC-HMS Implementation in San Antonio using Model Builder

Basin Interface Data Model

Project Interface Data Model

IDM Performance Goal To provide a database for all HMS data, so that the data may be queried and retrieved efficiently.

IDM Data Transfer Goal To store data in a manner so that it is readily transferable from geodatabase to HMS files, and visa versa. HMS files HMS geodatabase

IDM Spatial Analysis Goal To store watershed (spatial) data in a manner that can be easily viewed and analyzed in ArcMap.

IDM Intuitive Use Goal To create a data structure that is logical to the HEC-HMS user

IDM Arc Hydro Compliance Goal Arc Hydro connectivity and naming conventions Arc Hydro Geodatabase IDM Geodatabase HEC-HMS Program files HydroID FeatureID HMSCode Element Names

The HMSCode IDM Flow Network .basin HMS text file Connection between HMS feature classes and parameter tables Connection between HMS and IDM elements HMSSubbasin attribute table HMSInitialConstant table IDM

IDM Geodatabase Design Purpose: To provide a HMS data storage structure that meets IDM design goals Visio 2000 UML ArcGIS Repository Geodatabase Schema

UML The Unified Modeling Language

UML UML Diagram Geodatabase Table

Basin GDB

Project GDB

Importing HMS Data Use Visual Basic to develop codes for transferring data.

Constant Loss Rate (inches/hour) Llano at Junction Model Rainfall lost to infiltration

Snyder Time to Peak (hours) Llano at Junction Model Time to Peak

Modified Puls Storage (ac-ft) Llano at Junction Model Storage required to produce 5000 cfs flow

Integrating Arc Hydro and HEC Models Arc Hydro and hydrologic models Interface Data Model for HEC-HMS Implementation in San Antonio using Model Builder

Regional Storm Water Modeling Program and Master Plan for San Antonio City of San Antonio Good morning. It’s my pleasure to share with you an example of regional cooperation within Bexar County.

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

Sources of Rainmap data Historical Nexrad data – NWS and TNRIS archive Design rainfall maps – 2, 5, 10, 25, 50, 100 year design rainfalls as used for FEMA floodplain studies Real-time Nexrad data using web services (Tom Wesp)

NEXRAD WSR-88D Radars in Central Texas (Weather Surveillance Radar-1988 Doppler) scanning range = 230 km NEXRAD Products: Stage I: Just Radar Stage II: gages, satellite, and surface temperature Stage III: Continuous mosaic from radar overlaps One of the strong motivation points for integration is the availability of good quality precipitation estimates at higher temporal and spatial resolutions to feed engineering models!! In particular the NEXRAD products of the NWS that now provide “true spatial realizations of rainfall fields” With historical and real time sources EWX – NEXRAD Radar in New Braunfels Source: PBS&J, 2003

Digital Rain Maps from National Weather Service (03/04/2004)

Digital Rain Maps from National Weather Service (03/29/2004)

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

Design Rainfall Maps 100yr 06h 100yr 12h 100yr 24h But, how to get variation of intensity with time?? We also need the design precipitation hyetograph to obtain reliable design discharge hydrographs We may explore “hyetograph analysis” to get a theoretical hyetograph shape Using the Alternating Block Method or Instantaneous Intensity Method

Real-Time NEXRAD Datasets from Web Services

FEMA 100-year flood plain map in Bexar County

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

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

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

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 Arc 9 Toolbox exchanges data between DSS and the geodatabase Time series catalog Many time series

Flow Change Points Models communicate with one another through Arc Hydro at designated points

Nexrad Map to Flood Map in Arc 9 Model Builder FLOODPLAIN MAP Flood map as output Model for flood flow HMS Model for flood depth Nexrad rainfall map as input

Conclusions An interface data model provides a convenient way of storing and visualizing the content of a hydrologic model Combination of interface data models and ArcGIS Model Builder provides a very efficient means of work flow automation