HomeMy WebLinkAboutHandouts_Environmental Advisory Committee_1/8/2025 It's the Beach Road Association's view that the
Study substantially demonstrates that vessel
traffic congestion, the speed, wakes, and
operation of vessels in the Jupiter Narrows create
unsafe levels of vessel traffic congestion, a
significant risk of collision, and are, in fact, a
significant threat to boating safety.
The FWC has irrefutable data from the
AtkinsRealis Study that should mandate
establishment of a 24-7, 365-day slow speed
zone in the Jupiter Narrows from the Cato Bridge
Speed Transition Sign to Marker 59 is necessary
to maintain public safety.
The Study shows 80% of the Risk Profiles in the
South Section are High or Significant Risk. 100%
of the Prof iles show a Significant Risk, High Risk
or Risk Profile.
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essel Density-Off Peak Low Risk;;.` _ '.
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essel Density-Off Peak RISK Ln '
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The ettectiveness of the proposed design depends on the ability of the breakwaters to reduce the
wave energy (i.e., the wave heights) reaching the mangrove islands. The present study considers the
design conditions and estimates the wave heights transmitted across the breakwaters. At MHW the
breaking wave heights at the riverside toe of the breakwater should not exceed 2.3 ft. Given the
breakwater dimensions in
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Figure 4.4,the present study applies formulas in Van der Meer et a; (2005)and Goda and Ahren (2008)to
determine that the breakwaters should reduce wave heights by 70%.Therefore, the breakwaters should
reduce the 2.3-ft incident waves on the river side to a height of about 0.7 ft on the shoreside of the
breakwaters.
2.3-ft incident waves would not be present in minimal wake zone, how would
minimal wakes compare to 0.7 ft Breakwater wakes?
Note these breakwaters are quite large at 17 feet wide + 3-4 feet high and 3 feet
of crest = 6-7 feet of Rock height- 800 linear feet - Almost 3 football fields long
At pinch point their width + distance to Mangroves ranges from -45 to -75 feet.
That's -1/3 of the waterway from Mangroves to East side of ICW
The cumulative impacts of the Federal BLM Breakwaters to be installed on West
Shore +The Island Breakwaters are not Addressed?
Safety Hazards from Compressing the Jupiter Narrows Waterway further are not
addressed?
Do we need these Massive Breakwaters with a minimal wake zone? Smaller?
West Shore to ICW West Edge is about 150 feet—50 yards
ICW Width is about 140 feet — 50 yards
ICW East Edge to Mangroves is about 145 feet -50 yards
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