THE FLOOD RECOVERY GUIDANCE FOR MY COMMUNITY SHOWS ADVISORY BASE FLOOD ELEVATIONS BEING CALCULATED USING ADVISORY STILLWATER ELEVATIONS. HOW WERE THESE STILLWATER ELEVATIONS DERIVED?
In response to Hurricanes Katrina and Rita, FEMA conducted a new flood frequency analysis which incorporates storm data from the past 35 years, including data from these storm events, long term tide gage records, and other engineering studies. The flood frequency analysis uses tide (water level) gage data, a collection of the water levels of the sea as it rises and falls, and observed high water marks in the impacted areas. The results of these analyses are Advisory Base Flood Elevations for coastal Louisiana parishes. For certain parishes in Louisiana, the results of the flood frequency analysis determined the BFEs on the current FIRM may be underestimated. Current BFEs were found to be between 1 and 9 feet too low. In areas where elevations were only 1 to 2 feet too low, guidance has been provided in terms of applying a freeboard to current 1-percent-annual-chance BFE. Areas where current BFEs were found to be significantly low (3 feet or greater), alternative guidance is being provi
Related Questions
- THE FLOOD RECOVERY GUIDANCE FOR MY COMMUNITY SHOWS THE ADVISORY BASE FLOOD ELEVATIONS BEING CALCULATED USING FREEBOARD. WHAT IS FREEBOARD AND HOW WERE THE FREEBOARD ELEVATIONS DETERMINED?
- THE FLOOD RECOVERY GUIDANCE FOR MY COMMUNITY SHOWS ADVISORY BASE FLOOD ELEVATIONS BEING CALCULATED USING ADVISORY STILLWATER ELEVATIONS. HOW WERE THESE STILLWATER ELEVATIONS DERIVED?
- IS MY COMMUNITY REQUIRED TO USE THE ADVISORY BASE FLOOD ELEVATIONS DEVELOPED USING THE METHODS IN THE FLOOD RECOVERY GUIDANCE?
