County Maintained Roads There are 143 County maintained roadways within the Palm River redevelopment area. The 100-Year Event exposed approximately 90% of the County maintained roads to flooding. FEMA Flood Maps, Category 1 Hurricane, and Category 3 Hurricane all exposed approximately 43%, 20% and 76% of roads, respectively. The two SLR flood threats exposed significantly less roads to flooding. The 2050 Intermediate SLR exposed approximately 3.5% and the 2050 High SLR exposed approximately 7.7%. The roads on the western side of the redevelopment area were found to be the most prone to exposure. These roads are closer to East Bay and therefore more prone to flood threats that are associated with the ocean (hurricanes and SLR). These percentages refer to how many roads were impacted out of the total number of roads, not the total length of roadways submerged. Integrating flood depths is the next step of the vulnerability analysis. The asset threat matrix Table 16 identifies each County maintained road and its exposure to flooding during each flood threat. The results of this analysis were compared to the results of the USF Hillsborough County Community Vulnerability Study. The USF study maps showed Category 1 Hurricane with Intermediate-Low and High SLR to expose the western half of the redevelopment area and Category 3 Hurricane with Intermediate-Low and High SLR to expose almost the entire redevelopment area. These maps correlate to what was found in this analysis for Category 1 and Category 3 Hurricanes. The maps for the 100-Year Event, FEMA Flood Map, Category 1 and 3 Hurricanes, and 2050 Intermediate and High SLR are shown in Figure 18 , Figure 19 , Figure 20 , Figure 21, and Figure 22 . Table 21 (page 60) identifies the County maintained roadways exposed to each flood threat and critical flood depths associated with each threat. Table 15 shows a summary of the percentage of County maintained roads exposed by each threat. Table 15. Summary of County Maintained Roads Exposure Delaney Creek Watershed 100-Year Event FEMA Flood Maps Category 1 Hurricane Category 3 Hurricane 2050 Intermediate SLR 2050 High SLR % County Maintained Roads Exposed 90.21 43.36 19.58 75.52 3.50 7.69
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