Map-Based Flood Hydrology and Hydraulics


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Table of Contents

Map-Based Flood Hydrology and Hydraulics

Map-Based Hydrology and Hydraulics

Map-Based Hydrology and Hydraulics

Austin Digital Elevation Model

Austin Watersheds


Presentation Outline

Study Region in West Austin

Watershed Delineation by Hand Digitizing

30 Meter Mesh Standard for 1:24,000 Scale Maps

DEM Elevations

DEM Elevations

PPT Slide

PPT Slide

PPT Slide

Austin West 30 Meter DEM Elevations in meters

Flow Direction Grid

PPT Slide

PPT Slide

PPT Slide

Stream Network for 5 cell Threshold Drainage Area

Streams with 200 cell Threshold (ᡊ hectares or 13.5 acres drainage area)

PPT Slide

PPT Slide

Watershed and Drainage Paths Delineated from 30m DEM

DEM Data Sources for Texas

DEM Watersheds for Austin

Selected Watersheds and Streams

HMS Schematic Prepared with CRWR-PrePro

HMS Basin File

HMS Model of the Austin Region

PPT Slide

Maps Served on the Web

Design Precipitation Input

HMS Control File

HMS Results

Map-Based Hydrology and Hydraulics

Regional flood analysis in Houston

Study Region in West Houston Maps Developed using CRWR-Prepro by Seth Ahrens

Nexrad Rainfall for Storm of Oct 1994

Discharge in Buffalo Bayou at Katy October, 1994 storm

Calibrated Flow with HEC-HMS

Map-Based Hydrology and Hydraulics

Waller Creek DEM

Waller Creek Watershed Outlets

Waller Creek HMS Model

Flood Plain Mapping

Connecting HMS and RAS

Discharge at a Particular Cross-Section

Map-Based Hydrology and Hydraulics

HEC-RAS: Background

HEC-RAS: Cross-Section Description

HEC-RAS: Output

HEC-RAS: Data Translation

Digital Stream Mapping

Floodplain Mapping: Plan View

3D Terrain Modeling: Ultimate Goal

For more information about GIS and Hydrology, see To obtain CRWR-PrePro to link ArcView with HEC-HMS, see To take an online spatial hydrology course, see

Author: maidment


Home Page:

Other information:
AMS Meeting, Dallas, Jan 1999

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