Flood estimation in a highly urbanized watershed using advanced radar (NEXRAD)
Gladwell, Dawn C.
Bedient, Philip B.
Master of Science
Advanced radar (NEXRAD) was used for collection of rainfall data over Brays Bayou in Houston, TX for the storms in October 1994 and January 1998. The radar rainfall data was calibrated to the rain gauge system within the watershed and used as input into the hydrologic model, HEC-1. For the October 1994 storm, the hydrologic model was calibrated to produce a predicted hydrograph with a peak flow within 6% and a time-to-peak within one-half hour of the measured storm hydrograph at Main Street. The calibrated model was used to create an "Isoflow" chart, rainfall intensity versus duration, for peak-flow values at Main Street. This plot was proven successful using rainfall data from historical storms and will serve as a more accurate flood prediction tool to provide advanced flood warning to the Brays Bayou Watershed.
Geography; Hydrology; Civil engineering