 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
|
|
|
GIS-Based Hydrologic and Hydraulic Modeling for Floddplain Delineation at Highway River Crossings By David James Anderson, M.S.E. ABSTRACT The importance of the spatial variability inherent to a watershed contributing flow to highway drainage structures can greatly affect the time and resources dedicated to the design process, as well as the size and cost of the structure. Evaluating extreme storm events and the resulting floodplain is a time-consuming process that, in the past, has been accomplished by manually plotting the extent of the floodplain on paper maps. Automating this process, with the aid of geographical information systems (GIS), could result in significant time and resource savings in the design process. This research investigates the synthesis of previously developed hydrologic and hydraulic modeling tools for digital floodplain analysis at two locations - Castleman Creek (McClennan County, TX) and Pecan Bayou (Brown County, TX). The methodology proposed consists of site-specific terrain data development for hydrologic analysis and parameter extraction using CRWR-PrePro, terrain data development and floodplain delineation using CRWR-FloodMap andHEC-GeoRAS, and lumped parameter hydrologic modeling and steady flow hydraulic analysis using HEC-HMS and HEC-RAS. The results of the research indicate that although the availability of digital terrain data at an appropriate resolution may limit the application of these tools at small-scale sites such as are found at some highway river crossings, the methodology presented is an effective tool for representing the spatial variability of the watershed characteristics, integrating hydrologic and hydraulic modeling processes with GIS, and displaying an accurate floodplain map of the project site. The highlighted links that follow are connected to Adobe pdf files of the corresponding material. To view them you must have the Adobe Acrobat Reader 3.0. View the Report...(5.07MB)
These materials may be used for study, research, and education, but please credit the authors and the Center for Research in Water Resources, The University of Texas at Austin. All commercial rights reserved. Copyright 2000 Center for Research in Water Resources.
|
|
|
|
