The 100-year floodplain serves as the primary communicator of flood risk, but this delineation and its corresponding maps have been shown to be inadequate indicators of flood risk and poor predictors of flood damage, especially in urban areas. To be fair, most 100-year floodplain maps were never intended to convey flood risk: the boundaries of the floodplain were drawn to set insurance rates. They do not and never were designed to convey information related to depth or duration of inundation, water flow, historical damage, or susceptibility to pluvial flooding. In addition, the current flood maps do not inform investments in flood control and other infrastructure investments that positively or negatively influence urban flood risk. In short, decisions based off these maps are working on limited information often resulting in misguided efforts to increase flood adaptation and resilience. Although traditional hydrologic and hydraulic (H&H) models such as HEC-RAS could be used to provide more accurate flood hazard information, they are limited in terms of their computational loads, time to execute, and expense making them infeasible to run over large areas especially in regions with limited H&H data. To address this limitation this study uses a machine learning (ML) algorithm to estimate parcel level flood hazard along the southeastern Texas coast using a long-term record of parcel level historical flood damage. The purpose was to create improved flood hazard maps that not only better captures where flooding may occur, but to also enhance risk communication. The rationale for creating these new flood risk maps is not to replace the existing FEMA regulatory floodplain, but to compliment it in such a way that increases the ability of decision makers and residents to make decisions that increase their flood resilience.
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21 to 29 of 29 Results
May 4, 2020
William Mobley, 2020, "Replication Data for: Flood Hazard Modeling, Elevation", https://doi.org/10.18738/T8/BPARY8, Texas Data Repository, V1
Elevation was calculated using the National Elevation Dataset (NED), which was provided as a seamless raster product via the LANDFIRE website at a 30-m resolution. For more information on the initial dataset see : https://www.landfire.gov/elevation.php
Unknown - 91 B - MD5: de3c9e3526e87b573154fd0006d7a267
TIFF Image - 48.0 MB - MD5: 931b6534eb227c55370b8be3c228586d
May 4, 2020
William Mobley, 2020, "Replication Data for: Flood Hazard Modeling, Distance to Stream", https://doi.org/10.18738/T8/VLIS6E, Texas Data Repository, V1
Distance to Stream was calculated using Euclidean Distance based on the National Hydrography Dataset (NHD) stream and coastline features.
Unknown - 91 B - MD5: de3c9e3526e87b573154fd0006d7a267
TIFF Image - 1.0 GB - MD5: 6a77c53d86ae819846a714900bae7831
May 4, 2020
William Mobley, 2020, "Replication Data for: Flood Hazard Modeling, Flow Accumulation", https://doi.org/10.18738/T8/QRXYB7, Texas Data Repository, V1
Flow accumulation measures the total upstream area that flows into every raster cell based on a flow direction network as determined by the NED.
Unknown - 91 B - MD5: de3c9e3526e87b573154fd0006d7a267
TIFF Image - 102.1 MB - MD5: 31dfd3dabca15b6931e205e23f2e1d13
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