Hurricane Dennis report by Florida State DEP:
http://bcs.dep.state.fl.us/reports/dennis.pdf
Excerpt:
The entire coast of Walton County sustained major beach and dune erosion (condition IV) and major damage to numerous structures from the impact of Hurricane Dennis. The erosion impact was comparable to the impact of Hurricanes Eloise (1975), Opal (1995), and Ivan (2004). The impact of Dennis exacerbated the severe erosion conditions which had not recovered from last year.
Major structural damage was sustained along Walton County?s coast and was related to storm surge and waves undermining dwellings supported on foundations that do not conform to current building code standards. Major damage to nonhabitable understructure enclosures and appurtenant structures was also due to storm surge and waves. Wind damage to structures was not observed. In addition, many older dwelling
structures that are located at the top of the steep, eroded dune bluff are in imminent danger of structural damage as the soil beneath the concrete slab foundations slips down the unstable slope. Along several areas, the dune bluff recession leaves many pile supported dwellings sited on the beach.
Erosion now threatens the upland access and utility connections to these gulf-front properties, as well as the upland public infrastructure. Dana Beach (R116-R119) and Rosemary Beach (R119-R121) were critically eroded and could have been damaged more had the underlying peat strata not
been present.
A total of 11 single-family dwellings and seven nonhabitable major structures (six swimming pools and one garage) were destroyed. All these structures were sited seaward of the established CCCL. Another 13 single-family dwellings and 2 multifamily dwellings sustained major damage to their nonconforming foundations. These structures were also sited seaward of the CCCL. Additionally, 25 dwellings supported on nonconforming foundations are in imminent danger of structural damage as the soil beneath the concrete slab foundations slips down the unstable slope of the eroded dune bluff. In addition, a total of 19 habitable structures sustained moderate to major damage to nonhabitable understructure enclosures. Also, 400 feet of retaining walls were destroyed or sustained major damage.
http://bcs.dep.state.fl.us/reports/dennis.pdf
Excerpt:
The entire coast of Walton County sustained major beach and dune erosion (condition IV) and major damage to numerous structures from the impact of Hurricane Dennis. The erosion impact was comparable to the impact of Hurricanes Eloise (1975), Opal (1995), and Ivan (2004). The impact of Dennis exacerbated the severe erosion conditions which had not recovered from last year.
Major structural damage was sustained along Walton County?s coast and was related to storm surge and waves undermining dwellings supported on foundations that do not conform to current building code standards. Major damage to nonhabitable understructure enclosures and appurtenant structures was also due to storm surge and waves. Wind damage to structures was not observed. In addition, many older dwelling
structures that are located at the top of the steep, eroded dune bluff are in imminent danger of structural damage as the soil beneath the concrete slab foundations slips down the unstable slope. Along several areas, the dune bluff recession leaves many pile supported dwellings sited on the beach.
Erosion now threatens the upland access and utility connections to these gulf-front properties, as well as the upland public infrastructure. Dana Beach (R116-R119) and Rosemary Beach (R119-R121) were critically eroded and could have been damaged more had the underlying peat strata not
been present.
A total of 11 single-family dwellings and seven nonhabitable major structures (six swimming pools and one garage) were destroyed. All these structures were sited seaward of the established CCCL. Another 13 single-family dwellings and 2 multifamily dwellings sustained major damage to their nonconforming foundations. These structures were also sited seaward of the CCCL. Additionally, 25 dwellings supported on nonconforming foundations are in imminent danger of structural damage as the soil beneath the concrete slab foundations slips down the unstable slope of the eroded dune bluff. In addition, a total of 19 habitable structures sustained moderate to major damage to nonhabitable understructure enclosures. Also, 400 feet of retaining walls were destroyed or sustained major damage.