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Nelson Perez-Jacome Miami Sunny Day Flooding
- 1. << 1 >> << 1 >> Commission Meeting December 11th, 2019 Presented by: Nelson Perez-Jacome P.E. City Engineer
- 2. << 2 >> << 2 >> Miami Beach: Challenges of a low elevation barrier island
- 3. << 3 >> << 3 >> Low Elevation Seawalls / Limestone and Permeable Soils MIAMI BEACH SEA LEVEL RISE ADAPTATION CHALLENGES 1. Topography & Geology 2. Aging Infrastructure 3. High groundwater 4. Limited Data
- 4. << 4 >> Sunny Day Flooding is already impacting us… Indian Creek and 32nd Street
- 5. << 5 >> << 5 >> NOAA Tide Water Elevations – King Tides 2019 Minor Flooding Major Flooding Moderate Flooding Predicted Tide 0.975’ NAVD Verified Tide 2.18’ NAVD Virginia Key, Biscayne Bay
- 6. << 6 >> << 6 >> 2019 King Tides – Year in Review • This year peak king tides were experienced from September 26th through October 3rd. • The stormwater system functioned as expected but higher than normal tides caused minor flooding or standing water in some areas. • Most affected areas were: Indian Creek, North Bay Road, North Beach and Commerce Street.
- 7. << 7 >> << 7 >> Standing Water Reports King Tides Sept 26th - Oct 3rd 2019 18 flood/standing water related complaints were reported through EGov and by Calls to the Public Works Department Control Room Crisis Track Reported Standing Water at 140 Locations on Sep. 28th, 2019 • 82 - Green: Standing Water 0” – 3” • 46 - Orange: Significant Standing Water 3” – 6” • 12 - Yellow: Stormwater Flooding 6” – 12”
- 8. << 8 >> << 8 >> King Tides September 26th to October 3rd 2019 in photos
- 9. << 9 >> << 9 >> King Tides September 26th to October 3rd 2019 in photos
- 10. << 10 >> << 10 >> NOAA reports the frequency and duration of floods due to High Tides is increasing… Median high tide floods per year (black bars) from 1920-2018 (national median). The annual-median rise in coastal sea levels is also shown (blue line) The characterization of the trends in annual HTF frequencies, with 42 locations now accelerating and 25 linearly increasing with time. In 2018 the national median annual high tide floods (HTF) frequency reached 5 days, which tied the historical record of 2015
- 11. << 11 >> << 11 >> NOAA Reports annual flood records are expected to be broken again next year and for the years and decades to come… Since 2000 our region has seen a 200 to 250% increase in high tide related flood events. If this trends continues our region will likely see an average of 7 to 15 days of flooding by 2030 and 25 to 70 days by 2050. Miami Beach may see more days of flooding due to its lower elevations.
- 12. << 12 >> << 12 >> 2019 SLR Projections – Sea Level will continue to rise 30-Year Design Horizon 2050 12” (1 FT)
- 13. << 13 >> << 13 >> 2015 vs. 2019 SLR Projections
- 14. << 14 >> << 14 >> << 14 >> Our Program is Working… Indian Creek and 27th Street
- 15. << 15 >> << 15 >> Sunset Harbour 2.8 ft Hurricane Irma Sept 10 - 2017 2.3 ft KING TIDES Oct 5 -2017 1.7 ft Old Crown Road Elev.
- 16. << 16 >> << 16 >> Avoided 60 Tidal Flooding Incidents Due to Road Raising at Sunset Harbour January 2017 – October 2019 July 2017 Jan 2018 July 2018 Jan 2019 Jul 2019 Water Lever in Feet
- 17. << 17 >> << 17 >> Miami Beach Tidal Gauges – King Tide 2019 • Miami Beach tidal gauges indicate a maximum tidal level of 2.25 feet NAVD on Oct. 1. • This graph shows that we avoided eight tidal flooding events due to road raising in Sunset Harbour during Sept. 26-Oct. 3. • 2017: 17 events avoided • 2018: 11 events avoided • 2019: 32 events avoided through October 2019
- 18. << 18 >> << 18 >> Avoided flooding is directly correlated with higher elevations 1.27’ NAVD 1.80’ NAVD
- 19. << 19 >> << 19 >> Flood Mitigation Results Purdy Ave and Dade Blvd AFTER BEFORE Tides: 1.27 ft NAVD 10/11/11 Tides: 1.88 ft NAVD 10/15/19
- 20. << 20 >> << 20 >> Flood Mitigation Results Purdy Ave and 20th Street BEFORE Tides: 1.27 ft NAVD 09/11/11 Tides: 1.88 ft NAVD 10/15/19 AFTER
- 21. << 21 >> << 21 >> Flood Mitigation Results Purdy Ave - North of Dade Blvd BEFORE Tides: 1.80 ft NAVD 10/29/12 Tides: 1.88 ft NAVD 10/15/19 AFTER
- 22. << 22 >> << 22 >> Flood Mitigation Results Palm Island 316 South Coconut Ln BEFORE AFTER Tides: 1.88 ft NAVD 10/15/19 Tides: 1.40 ft NAVD 10/17/12
- 23. << 23 >> << 23 >> Flood Mitigation Results Palm Island 303 North Coconut Ln AFTER BEFORE Tides: 1.42 ft NAVD 10/17/12 Tides: 1.88 ft NAVD 10/15/19
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