1. Floodplain Delineation of Unsteady Flow Using HEC-RAS
Progress Report
Presented By: Kevin Donnelly

2. Study Area
The Colorado River between Wirtz Dam and Inks Dam (Lake LBJ) and its two major tributaries, Sandy Creek and the Llano River
Lake LBJ is miles long and 10,800 feet wide at its widest point. The lake covers 6,375 acres, and its capacity is 138,500 acre-feet.
Inks Dam

3. Objectives
Develop a terrain model combining 30-meter DEM data, 2-foot contours, and UNET cross sections
Develop new cross sections along the Colorado River (Lake LBJ), Llano River, and Sandy Creek using GeoRAS
Simulate flooding that occurred in November 2000
Import resulting water surface profiles back into GIS were the spatial extent of the flooding can be better seen and understood

4. Input Data

5. Intermediate Data

6. Results

7. Questions