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Building Resiliency in Transportation Facilities

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Building Resiliency in Transportation Facilities SR-A1A Tidal Flooding Study Presented by James Poole, FDOT & David Boyer, Scalar Consulting Group Inc. May 27, 2021 Project Introduction One of the roadway segments identified for a resiliency study in the Broward MPO’s 2045 metropolitan transportation plan is this segment of SR A1A in Hollywood. The catalyst for the study was recurring flooding. The Study area extends from Southbound ramp tie down just south of Hallandale Beach Boulevard to the south end of SR-A1A bridge just north of Dania Beach Boulevard Study Status: Study Area Existing Conditions Report submitted to FDOT on July 8, 2020 Alternatives Report submitted to FDOT on August 28, 2020 FDOT Programing of three pump station began in December 2020 Begin End Project Project 2 Tidal Elevation Basics Mean High High Water (MHHW) – The average of the higher high-water height of each tidal day observed - 0.53 NAVD Mean High Water (MHW) – The average of all the high-water heights observed - 0.38 NAVD Mean Tide Level (MTL) – The arithmetic mean of mean high water and mean low water - (-) 0.87 NAVD 3 Sea Level Rise Data October 2019 King Tide elevation - 2.64 NAVD October 2020 King Tide elevation - 2.51 NAVD 4 Sea Level Rise Data Sea Level Rise (SLR) applied to MHHW (NOAA intermediate values for project site) 2.13 – Year 2040 4.96 – Year 2070 5 Existing Conditions Existing Conditions Report - Identify and evaluate: Field observations Flooding observed Seawalls Low road elevations Potential overflow locations Storm sewer systems Locate outfalls Contributing areas Land use Overland flow weirs Create model of system 6 Tidal Flooding Observations Overflow of low sidewalk/park areas Overflow of low seawalls Backflow through storm sewer systems Infiltration though leaky pipes Occurs both at night and during the day October 2020 King Tide Flooding on SR-A1A From a low seawall and over a sidewalk May 2020 King Tide Flooding on SR- A1A at Harrison Street – 10 PM October 2019 King Tide Flooding on SR-A1A 7 Tidal Flooding Observations Evidence of upwelling or groundwater affecting tidal flooding observed with study Side streets have low points adjacent to SR- A1A Average grate elevation is 0.88 NAVD October 2020 King Tide Flooding on SR-A1A (North American Vertical Datum of 1988) From a low seawall and over a sidewalk MHHW – 0.53 NAVD = 0.35’ freeboard SR-A1A at Azalea Street – October 2020 8 Tidal Flooding Observations Overtopping of low areas with no Overtopping of low seawalls seawalls and interconnected low areas 9 Flooding – Backflow through Storm Systems Leak at joint at a manhole 12 Flooding – Flow through Leaky Seawalls Vertical seam where the walls join not sealed 13 Flooding – Collapsed or Damaged Seawalls 15 Hydrological Modeling Received High Resolution LiDAR data from FDOT Lidar accuracy: +/- 3” to 7 Received as-built data and CADD files from on-going FDOT projects along corridor Determined pipe and invert data, designation of pipe types and pipes that have been lined, and identified pipes with installed back flow prevention 16 Hydrological Modeling Data processed/refined and imported into ICPR4 (modeling software) Digital Elevation Model and CADD data are inputs to GIS for data manipulation and ICPR4 model development Storm sewer systems appear adequate for storm flows, but inlets are too low relative to tide stages Flooding from tidal waters 17 Project Results Alternatives Report: Review of existing devices Proposed remedies: Prevention Raise low seawalls Construct new seawalls where none exist Attenuation Repair or replace backflow preventers Repair or replace leaking structures Pump stations to remove tidal flows Restoration Raise, reconstruct low side streets Raise, reconstruct SR-A1A 21 Backflow Preventers Flap gates exist on most outfalls throughout the corridor 5 – Ross 70 HFV-A Flap Gates 3 – In-line Flap Gates 6 - new WaPro valves installed 8/2020 18 – CheckMate Valves 22.
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