2018 Gotham 2014) program appropriated $13.4 billion in CDBG-DR funds to the State of Louisiana for recovery from Hurricanes Katrina and Rita, administered through the Louisiana Office of Community Development (OCD) as the Road Home Project. Department of Housing and Urban Development (HUD) Community Development Block Grant Disaster Recovery (CDBG-DR Martin, 2018 Martin et al. Thus, without additional assistance, such homes would not be elevated and they would remain at risk for repetitive flood losses. However, HMGP policy requires homeowner-matching funds, typically 25%, for elevating the homes in the post-disaster recovery, and many victims of these hurricanes were unable to provide such funding. 2022) was an important source of federal assistance to support citizens affected by Hurricanes Katrina and Rita. The Federal Emergency Management Agency (FEMA) Hazard Mitigation Grant Program (HMGP Bukvic & Borate 2021 Ji & Lee 2021 Seong et al.
These events left an unprecedented number of deaths and destroyed homes and businesses in coastal Louisiana (Myers et al. Less than a month later, Hurricane Rita struck near the Louisiana-Texas state border, impacting 25,000 square miles in the state of Texas and causing $10 billion (Mayer et al. In 2005, Hurricane Katrina made landfall near the Louisiana-Mississippi state border, causing massive devastation and forcing 400,000 people to evacuate (Chuang et al.
These results enhance understanding of cost-effectiveness of federal elevation mitigation investments, benefits of elevating homes above the minimum requirements, and most effective elevated heights for homes. This elevation generates a BCR of 1.5 and 1.7 over a 30-year mortgage and a 70-year building lifetime, respectively, if the benefit is allocated proportionately. The analysis reveals that elevating existing homes by either 3 feet above the ground or to the base flood elevation (BFE 100-year flood elevation), whichever is higher, reduces the median AAL by 98%. Then, we determine optimal first-floor height (FFH) by foundation type and 100-year flood depth. We compute benefit–cost ratio (BCR) and net benefit–cost ratio (NBCR) of the elevation mitigation investment across multiple time horizons, considering several funding scenarios. We use multiple return period flood depths from FEMA RiskMAP non-regulatory flood depth and calculate flood risk reduction as the difference between pre- and post-elevation AAL. This research evaluates the cost-effectiveness of the Road Home Program elevation mitigation assistance for a case study of homes in Jefferson Parish, Louisiana, using benefit–cost analysis (BCA) based on average annual loss (AAL) prediction.
After Hurricanes Katrina and Rita in 2005, the State of Louisiana received federal Community Development Block Grant Disaster Recovery (CDBG-DR) assistance, administered by the Louisiana Office of Community Development (OCD) as the Road Home Program, to provide homeowners with the required matching funds for elevating damaged homes under the Federal Emergency Management Agency (FEMA) Hazard Mitigation Grant Program (HMGP).
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