Table of Contents

EXECUTIVE SUMMARY ..... 3

  1. PROJECT DESCRIPTION ..... 1
  2. PURPOSE AND NEED ..... 2
  3. Location Hydraulic Study Purpose ..... 3
  4. DRAINAGE CONDITIONS ..... 4
  5. DESIGN CONSIDERATIONS ..... 5
  6. Roadway Design Considerations ..... 5
  7. Cross Drain Design Considerations ..... 6
  8. EXISTING CONDITIONS ..... 8
  9. Existing Cross Drains ..... 8
  10. Existing Flooding ..... 10
  11. Proposed Conditions Modeling ..... 16
  12. Proposed Minimal Encroachment Evaluation ..... 19
  13. CONCLUSIONS ..... 21

List of Figures

Figure 1 - Project Location Map ..... 1 Figure 2 – Proposed Typical Section of SR 72 ..... 5 Figure 3 - Proposed Typical Section of SR ..... 6 Figure 4- EX-0 (Existing 8'x 8' CBC) (12/18/2017) ..... 8 Figure 5 - EX-1 (Existing 4'x 5' CBC) (1/9/2018) ..... 9 Figure 6 - EX-2 (Existing 30-inch RCP) (12/18/2017) ..... 9 Figure 7 - EX-3 (Double 24-inch) (12/18/2017) ..... 10 Figure 8–Damage to SR 72 due to Hurricane Ian ..... 11 Figure 9 - Hurricane Ian Flooding of SR 70 and SR 72 ..... 11 Figure 10 - USGS Peace River Elevations for Monitoring Period ..... 13 Figure 11 - NEXRAD Rainfall Tiles ..... 14 Figure 12 - Unit Hydrograph Comparisons ..... 14 Figure 13 - Hurricane Ian Inundation Mapping Results ..... 15

SR 72 from CR 661 to SR 70 & SR 70 from CR 661 to the Peace River Bridge FM #: 443123-1-22-01

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