BACKGROUND OF GIS USE IN WATER RESOURCES APPLICATIONS
Recently, the use of automated methods in water resources engineering applications has proven to be a viable alternative to more traditional hand calculation methods for many engineering agencies. The Texas Department of Transportation (TxDOT) is one of many agencies interested in using automated methods to aid in the hydrologic parameter development required for highway drainage facility design.
As a large portion of the cost associated with highway projects is attributed to the design and construction of drainage facilities, research has been dedicated to exploring a more economical and time efficient means of design. Geographic Information Systems (GIS) are a means of simplifying this process in that a GIS is capable of computing spatially derived hydrologic parameters such as watershed area, SCS curve number (for runoff and lag time computation), gridded precipitation, flow length, and slope for each watershed in a relatively short time.
This implementation project follows an investigation conducted by
Anderson (2000) for the Texas Department of Transportation (TxDOT). Anderson
implemented GIS-based tools developed by CRWR at two sites in Texas:
Castleman Creek (McClennan County, TX) and Pecan Bayou (Brown County,
hydrologic analysis and parameter extraction (CRWR-PrePro), terrain data