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Statement of Work • Conduct a Hydrographic
Survey from Congress Ave. to S-155.
• Analyze and re-trace the surveys performed by Sea Diversified, Inc. from 2007 through 2010.
• Collect additional data immediately upstream of S-155.
• Review flow data from the SFWMD DBHYDRO data base.
• Prepare a survey drawing and report detailing our findings and making comparisons to the Sea Diversified, Inc. surveys.
• Recommendations for future surveys.
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Summit Blvd.
Forest Hill Blvd.
S-155
Sediment
Trap
Equipment & Field Procedure
Vertical Datum = NAVD 88
• Elevations established using published values
• FCE 3521 – USACOE
• Summit 10 - PBC
• Odom HydroTrac Echo Sounder to collect depth soundings.
• 0.1’ Resolution
• 200 KHz transducer
Horizontal Datum = NAD 83
• Trimble SPS351 DGPS
• Sub-Meter accuracy
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Sediment Collection
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Total Accretion
Years 2007 – 2008 2008 – 2010 2010 – 2013
Total (CY) 10,478 6,401 8,643
Average / Year 10,478 3,200 2,881
Survey Conclusions
• It appears the sediment trap is working.
• There is approximately 1 foot of material accumulation per year along westerly portion of the trap after year one.
• Flow rates through S-155 do not appear to effect the performance of the trap.
• There are no significant changes in the C-51 bottom configuration upstream or downstream of the trap.
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Recommendations
• Perform hydrographic surveys twice a year at the end of the wet season and at the end of the dry season.
• Survey immediately upstream of S-155.
• Perform a hydrographic survey downstream of S-155 to the discharge into the Intracoastal Waterway.
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