Local mitigation strategy (LMS) - Volusia County Government

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SECTION 5: HAZARD PROFILESHYDROLOGIC HAZARDS5.8 COASTAL EROSION5.8.1 BackgroundCoastal erosion is a hydrologic hazard defined as the wearing away of land and loss of beach, shoreline,or dune material and is measured as the rate of change in the position or horizontal (landward)displacement of a shoreline over a period of time. Short-term erosion typically results from episodicnatural events such as hurricanes and storm surge, windstorms and flooding hazards, but may beexacerbated by human activities such as boat wakes, removal of dune and vegetative buffers, shorelinehardening and dredging. Long-term erosion is a function of multi-year impacts such as wave action, sealevel rise, sediment loss, subsidence and climate change. Climatic trends can change a beach fromnaturally accreting to eroding due to increased episodic erosion events caused by waves from an aboveaveragenumber of storms and high tides, or the long-term effects of fluctuations in sea level.Natural recovery from erosion can take years, often decades. If a beach or dune system does notrecover quickly enough naturally, coastal and upland property may be exposed to further damage insubsequent coastal erosion and flooding events. Human actions to supplement natural coastal recovery,such as beach nourishment, dune stabilization and shoreline protection structures (e.g., sea walls,groins, jetties, etc.) can mitigate the hazard of coastal erosion, but may also exacerbate it under somecircumstances.Death and injury are not associated with coastal erosion; however, it can cause the destruction ofbuildings and infrastructure and represents a major threat to the local economies of coastalcommunities that rely on the financial benefits of recreational beaches.5.8.2 Location and Spatial ExtentAll coastal areas in Volusia County are susceptible to coastal erosion. Using Florida Department ofEnvironment field data beginning in 1972, it is clear that Volusia County shorelines are moving due toerosion, accretion, and beach nourishment projects 7 . Further, nearly half of the 47 miles of shoreline inVolusia County are classified as critically eroded.The beach ridge in Volusia County ranges from 300 – 3,000 feet in width. A majority of the county,ranging approximately from Ormond Beach to Bethune Beach, has fine-grained quartz sand. Sand inareas north and south of this area consist of a shell-quartz mixture and have steeper slopes than thecentral county. The southernmost mile of shoreline in Volusia County makes up part of the CanaveralNational Seashore Park, while the northernmost area is part of the North Peninsula State RecreationArea.7 Foster, Emmet and Jenny Cheng. Shoreline Beach Change Estimates, Volusia County, 2000. Office of Beaches and Coastal Systems, FloridaDepartment of Environmental Protection; Beaches and Shores Research Center, Florida State University.Volusia County Multi-jurisdictional Local Mitigation StrategyFebruary 20105:41
SECTION 5: HAZARD PROFILES5.8.3 Historical OccurrencesAccording to the National Climatic Data Center, there have been five events with reported coastalerosion impacts in Volusia County since 1998, as shown in Table 5.13. Because the erosion events werepart of other hazard events (e.g., storm surge and hurricanes), the monetary damage for the erosionalone is unknown.TABLE 5.13: Historical Coastal Erosion ImpactsLOCATIONDATEDEATHS/INJURIESPROPERTYDAMAGE(2009 dollars)Volusia County 9/14/1999 0/0 $56,444,488St. Lucie andVolusia CountiesBrevard andVolusia CountiesSt. Lucie andVolusia Counties10/14/1999 0/0 $68,539,7359/04/2001 0/0 $6,333,8509/25/2004 0/0 $440,408,221Volusia County 8/21/2008 0/0 UnknownSource: National Climatic Data CenterDESCRIPTIONHurricane Floyd caused significant beach erosionin Volusia County. Of the property damageestimates, over $13 million was attributed tobeach erosion.Hurricane Irene caused beach loss of four to tenfeet in the affected areas with damage in themillions.Storm tide from a tropical storm reached two feetabove normal, causing significant beach erosion.Severe beach erosion was reported fromHurricane Jeanne, a category 3 storm.New Smyrna Beach experienced a loss of 50 feet ofnew sand due to wind gust of over 45 MPH fromTropical Storm Fay. Even Orange and Seminolecounties experienced riverine erosion along the St.Johns River.The severity of coastal erosion is typically measured through a quantitative assessment of annualshoreline change for a given beach cross-section of profile (feet or meters per year) over a long period oftime. Erosion rates vary as a function of shoreline type and are influenced primarily by episodic events,but can be used in land use and hazard management to define areas of critical concern.According to the Florida Bureau of Beaches and Coastal Systems, a division within the FloridaDepartment of Environmental Protection, there are 4 critically eroded beaches in Volusia County,totaling over 22 miles of beachfront 8 . These areas are highlighted in Figure 5.8. A critical beach erosionarea is defined as an area where natural or human processes has caused or contributed to the erosionor recession of the beach or dune system (Florida Bureau of Beaches and Coastal Systems). The largestcontiguous area of critically eroded beach is an 11 mile stretch between Ormond Beach and DaytonaBeach Shores. This area is threatening recreation and development opportunities in the area. There arealso 8 miles of critically eroded beachfront between New Smyrna Beach and Bethune Beach. In addition,there are two segments of critically eroded beach in northern Volusia that threaten State Road A1A.8 Office of Beaches and Coastal Systems, Florida Department of Environmental Protection, 2009.Volusia County Multi-jurisdictional Local Mitigation StrategyFebruary 20105:42
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VOLUSIA COUNTY, FLORIDAMULTI-JURISD
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SECTION 1: INTRODUCTION1.2 PURPOSET
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SECTION 1: INTRODUCTIONand land use
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SECTION 2: PLANNING PROCESSSECTION
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SECTION 2: PLANNING PROCESSPlan Out
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SECTION 2: PLANNING PROCESSHelp com
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SECTION 2: PLANNING PROCESSDiscussi
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SECTION 7: CAPABILITY ASSESSMENTTAB
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SECTION 8: MITIGATION STRATEGYThe s
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SECTION 8: MITIGATION STRATEGYTABLE
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PriorityHazard(s)MitigationTechniqu
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SECTION 10: PLAN MAINTENANCE PROCED
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APPENDIX B: BYLAWS AND OPERATING PR
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Article IV. ObjectivesThe objective
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B. Meetings, Voting and Quorum1. Me
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• Periodic review of the status o
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In its discretion, the LMS Working
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This analysis may be conducted by t
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• The participants proposing the
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• The currently approved listing
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LMS Working Group, with the support
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Volusia PreparesTHE VOLUSIA COUNTY
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Volusia County Local Mitigation Str
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jurisdictions, the Florida Division
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file://C:\Documents and Settings\18
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Aug. 17, 2009Contact: Shelley Szafr
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APPENDIX F: INDIVIDUAL JURISDICTION
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PriorityHazard(s)Mitigation Techniq
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Local mitigation strategy (LMS) - Volusia County Government

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