Date of Award
Master of Science
Brian A Waldron
Arleen A Hill
Dorian J Burnette
Flood zones with 1% and 0.02% of annual flooding chance are projected in the Federal Emergency Management Agency’s (FEMA) digital flood insurance rate maps (DFIRMs) and are suited for identifying flood risk at the largest impacts. However, less severe floods, which are not mapped in DFIRMs, still cause significant damage and occur on a more frequent basis. This article employs an easy-to-setup GIS-based solution for rapid inundation mapping of small flood events. The linear interpolation technique (LITE Flood) is developed to rescale the hydraulic behavior inherent with a larger flood event without performing additional hydraulic simulations. The approach is evaluated by comparing the results to the corresponding storm scenarios simulated in the HEC-RAS, a standard river hydraulics simulator. The case study is a portion of the Wolf River and its two main tributaries in Shelby County that is located in the southwest corner of Tennessee, USA, where stream channelization mitigated large flood events but has caused frequent flooding from less severe storms. Results indicate that LITE Flood can be used to delineate more frequent storm events, thereby aiding local community emergency response agencies who often do not have the expertise to perform more sophisticated hydraulic modeling but do have a GIS capacity.
dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.
Javadnejad, Farid, "Flood Inundation Mapping using HEC-RAS and GIS for Shelby County, Tennessee" (2013). Electronic Theses and Dissertations. 841.