CEE 795 Water Resources Modeling and GIS Learning Objectives: Describe the HEC-River Analysis System (RAS) Model Utilize HEC Geo-RAS to import data into RAS Handouts: Ras-example.doc Assignments: Exercise #6 Lecture 7: HEC-RAS and Geo-RAS March 6, 2006

HEC-RAS River Analysis System Developed by Hydrologic Engineering Center (HEC) One dimensional steady and unsteady flow analysis Subcritical, supercritical, and mixed flow regime calculations

HEC-RAS cont. Manual Data Input Required –stream centerline –cross sections –Manning’s “n” –flow data

Main Menu

Geometric Data (stream configuration)

Cross Sections

Table Output

Profiles

HEC GeoRAS Pre-RAS processor –Creates HEC-RAS input file –Input Needs Triangular Irregular Network (TIN) Land Use Data

HEC GeoRAS Developed by Hydrologic Engineering Center (HEC) pre and post Data Processor for the River Analysis System (HEC-RAS)

HEC GeoRAS (creating a TIN from topography)

HEC GeoRAS (input Triangular Irregular Network)

HEC GeoRAS Pre-RAS processor –Saves time on data input no manual cross section entry no manual Manning’s “n” entry

HEC GeoRAS (Pre-Processing) Centerline Banks Cross Sections

HEC GeoRAS (Cross Section)

HEC GeoRAS Post-RAS processor –Accepts HEC-RAS output file –Output Formats Creates floodplain TINs Creates depth and velocity maps –Saves time on data presentation

HEC GeoRAS (Post Processing)

HEC GeoRAS (Floodplain Delineation)