October 2010 Article: Hydrologic Modeling of an Extreme Flood in the Guadalupe River in Texas, by Hatim O. Sharif, Almoutaz A. Hassan, Sazzad Bin-Shafique, Hongjie Xie2, Jon Zeitler.
"Flash Flood Alley"
One of the most flash flood prone areas in the U.S. is a region of South-Central Texas, called Flash Flood Alley (see figure) by local residents and weather experts. This dubious honor is the result of both climatic and geomorphic factors. In November 2004, a moist air mass from the Gulf of Mexico combined with moist air from the Pacific Ocean resulted in the wettest November in Texas since 1895. This paper examines the meteorological conditions that led to this event and applies a two-dimensional, physically based, distributed-parameter hydrologic model to simulate the response of a portion of the basin.
The study results clearly demonstrate the ability of physically based, distributed-parameter simulations, driven by operational radar rainfall products, to adequately model the cumulative effect of two rainfall events and route inflows from three upstream watersheds without the need for significant calibration. Results of simulation by the distributed model demonstrate the advantage of using quality-controlled radar products, which typically better characterize the spatial and temporal distribution of rainfall than rain gauges.
[Please note: I have quoted and paraphrased freely from the article, but the interpretation is my own!]
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