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,%Wprone area within this sub- basin , located along the Main Relief Canal from Country Club Drive to the Indian River Lagoon , is a portion of the IRFWCD that extends 1 mile east to west and 1 /2 mile north to south . The flood elevations range from 6 feet at th west end to 8 feet at the junction of the Main Relief Canal to the Indian River Lagoon ( Indian River County Public Works , 2002 ) . South Relief Canal Sub-Basin. A portion of the largest flood prone area within the IRFWCD is located in this sub- basin . The approximate boundaries of this flood prone area are as follows : South Relief Canal to the north , 43rd Avenue to the east , 74th Avenue to the west, and the St . Lucie County line to the south . The flood elevations int is area range from 21 to 24 feet. This area floods due to the limited discharge capacity oft the relief canals and low elevation . The other flood prone area in this sub- basin is located along the Lateral "J " Canal ; it is a '/<- mile wide area that extends from 13th Street southeast tot e St . Lucie County line . Flood elevations are from 19 to 21 feet ( Indian River County Public Works , 2002 ) , The Department of Public Works has identified the following areas as being chronically flooded : 35th Avenue south of 12th Street ; U . S . Highway 1 at 10th Street; CR 512 at North County Park ; • 27th Avenue between 4th Street and 5th Street SW ; and Old Dixie Highway between 4th Street and Oslo Road . 4. 1 . 1 . 3 Risk Assessment Flooding is the single hazard producing the most recurrent impact in Indian River County . All communities within Indian River County are highly vulnerab a to flooding , but they are not all vulnerable for the same reasons . The barrier island comrr unities (Town of Orchid , Indian River Shores , and the beach side of the City of Vero each ) are obviously highly vulnerable to storm surge damage from hurricanes . The communities of Sebastian and Orchid , located near the Sebastian Inlet and along the Sebastian River , also are highly vulnerable to flooding associated with hurricane winds and stormsurge . The mainland portion of the City of Vero Beach is less vulnerable to oceanic storrr surge due to its location between inlets . Wind packing of the water within the Indian River ay still produce substantial flooding along the riverfront . Communities away from the water such as Fellsmere and the urbanized areas along Route 60 west of Vero Beach are more vulnerable to wind damage from hurricanes and flooding associated with rain rather than storm surge . The risk assessment data for flooding in Indian River County are based on data developed for the MEMPHIS ( Mapping for Emergency Management , Parallel Hazard Information System ) developed by the FDCA . Table 4 . 4 illustrates the number and value of structures in each of the FEMA- identified flood zones . The zone with the highest number of structures structure value , and people is the X zone , which is known as the 500-year flood . Table 4 .2 describes the definitions of each of the FEMA flood zones . 4- 17