Local mitigation strategy (LMS) - Volusia County Government

SECTION 6: VULNERABILITY ASSESSMENTGEOLOGIC HAZARDS6.14 SINKHOLEBased on historic incidents, the unincorporated areas of Volusia County have been vulnerable to sinkholehazards, with 78 occurring in the study region between 1973 and 2005. Per the Hazards Profiles section,most of the county is at a low to very low risk from sinkholes. However, there is an area within theunincorporated western part of the county that is at medium risk to sinkhole hazards.MEMPHIS data was used to determine the number of people and improved properties that aresusceptible to sinkhole hazards. According to the MEMPHIS analysis, there are 256 people and 115improved properties valued at over $7 million that are in medium risk sinkhole hazard locations in theunincorporated areas of Volusia County.Per the MEMPHIS sinkhole assessment methodology 10 , sinkhole potential was determined based onpoints that were assigned to locations in Volusia County. Four classes of points were assigned, fordistance to historic sinkholes, geology, and soils:2 points if cell was within 2000m of an existing sinkhole;1 point if cell between 2000m and 5000m of an existing sinkhole;1 point if the cell was in the same USGS surface geologic unit as an existing sinkhole;1 point if the cell was in the same NRCS soil unit as an existing sinkhole.Each cell as assigned a value from 0 to 4:0: no significant risk1: low risk2: moderate risk3: high risk4 very high riskThe likelihood of experiencing future sinkholes is high in the area identified in Volusia County.10 MEMPHIS assessment methodology: http://lmsmaps.kinanco.com/methodqr.htmlVolusia County Multi-jurisdictional Local Mitigation StrategyFebruary 20106:33