Vulnerability Assessment The Vulnerability Assessment of the roadways builds off the paired asset-threat matrices to determine the quantitative risk of flooding for the roadways. The Delaney/Archie Creek Watershed Management Master Plan Update (November 2016) defined Level of Service categories based on the depth of flooding at the crest of the road. See Table 11 for the Flooding Level of Service (FLOS) criteria. Table 11. Flooding Level of Service Criteria
Hillsborough County Comprehensive Plan Definition
FLOS Category
FLOS Definition
No street flooding. All lanes are drivable
All lanes are drivable
A
Minor street flooding. At least one lane is drivable
Flood depths are less than or equal to 3-inches
B
Flood depths are more than 3-inches above the crown of the road, but less than or equal to 12-inches Street flooding is more than 12-inches above the crown of the road
Street Flooding
C
No limitation on flooding
D
The 25-Year/24-Hour storm (8-inches) is used on all County watersheds to determine the FLOS for County maintained roads. Climate threats for 2050 Intermediate SLR, 2050 High SLR, Category 1 and Category 3 Hurricanes were evaluated to determine the extent and depth of flooding on the County maintained roads. US 41 was also included in this analysis. The results of this analysis are summarized in Table 13 . The roads that are blank for the Delaney-Archie Creek FLOS November 2016 did not have an assigned FLOS. For the purpose of this Vulnerability Assessment, FLOS and criticality were correlated. Criticality was assigned as low, medium and high designations in comparison to FLOS criteria as shown in the Table 12 . Table 12. Correlation of FLOS and Criticality FLOS Category Criticality A Null B Low C Medium D High
Section 4
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