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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1 to 10 of 29 Results
Nov 8, 2021
William Mobley, 2020, "Flood Hazard Modeling Output", https://doi.org/10.18738/T8/FVJFSW, Texas Data Repository, V3
The results from a flood hazard study using the Random Forest Classification method to predict the probability of flooding at 30-m resolution for a 30,523 km2 area. We generate flood hazard maps for twelve USGS 8-digit watersheds along the coast in southeast Texas.
Adobe PDF - 5.7 MB - MD5: 5fdd8b7d3ab1d3f6abf660ccc20c2904
Jun 17, 2021
William Mobley, 2020, "Replication Data for: Flood Hazard Modeling, Impervious", https://doi.org/10.18738/T8/S7NFPI, Texas Data Repository, V2
Percent impervious was measured using the percent developed impervious surface raster from the National Land Cover Database (NLCD).
TIFF Image - 65.9 MB - MD5: 067f71b08b0b8f4ccf4d5677236b7d72
Jun 16, 2021
William Mobley, 2021, "Flood Hazard Modeling: Structural Output", https://doi.org/10.18738/T8/IPWHEL, Texas Data Repository, V1
The results from a flood hazard study using the Random Forest Classification method to predict the probability of flooding at 30-m resolution for a 30,523 km2 area. The shapefile contains structures within the study area. Two columns are available Flood Probability represents the...
Shapefile as ZIP Archive - 36.0 MB - MD5: c7a922429f0646794285f4d480e6fabf
TIFF Image - 1009.7 MB - MD5: b3b798e87551d84fae9a8bdcda8f4be8
May 4, 2020
William Mobley, 2020, "Replication Data for: Flood Hazard Modeling, TWI", https://doi.org/10.18738/T8/85LBLA, Texas Data Repository, V1
TWI is calculated by the following equation: TWI= Ln ((flow_accumulation * 900) + 1 )/(Tan((slope*π)/180 )) Where high values of TWI are associated with areas that are concave, low gradient areas where water often accumulates and pools making them more vulnerable to floods.
Unknown - 91 B - MD5: de3c9e3526e87b573154fd0006d7a267
TIFF Image - 265.4 MB - MD5: a765d3c0f3696ed50569aa6a8c67e784
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