Updated  09/26/06

Intracoastal Waterway, Broward County – Phase I

Summary of Work Performed

March 2000

We have essentially completed Task I-A (Data Collection) and have completed Task I-C (Establishment of Long-Term Requirements), based on all information presently available. Specifically, we have reviewed all available sediment data for the Broward County project area (Task I-C.1). However, we still await Jacksonville District COE core boring, grain-size distribution, and sediment chemistry data, presently being obtained and processed, before we determine the most appropriate channel locations in which to concentrate our planned sediment sampling, not yet scheduled. We have compiled and reviewed all available Jacksonville District, U.S. Army Corps of Engineers’ (COE) archival dredging records and channel surveys and have projected a preliminary estimate of future dredging and material storage requirements (Task I-C.2). Although sufficient to guide our initial identification and evaluation of candidate sites, this projection will be refined based on the results of the Jacksonville District’s three line survey of the entire ICWW, including the Broward County segment. Preliminary data from this survey is scheduled to be available in April 2000. We have inventoried all existing easements within the project area based on our review of relevant COE Real Estate maps and Control Data sheets for the Intracoastal Waterway, Jacksonville to Miami, and 1994 FIND blueline aerials, evaluated these easements with respect to their potential material storage capacity (Task I-C.3), and calculated the project area’s existing material storage capacity (Task I-C.4). Five sites, comprising eight existing easements with a combined preliminary material storage capacity of over 150,000 cubic yards, show some potential for dredged material management. Given the concentration of existing shoaling around Hillsborough Inlet and the potential for beach placement of appropriate channel sediment in this area, definition of operational channel reaches must wait until sediment data is received from the Jacksonville District COE to confirm or deny the presence of beach quality material.

Although not yet final, the results of Task I have allowed the preliminary evaluation of likely material management concepts (Task II-A) and the identification of 54 additional candidate sites (Task II-C) based on an office review of 1994 NAPP color-IR aerial photography, USGS 7.5-minute topographic quadrangle maps, Comprehensive Plan Future Land Use maps and U.S. Department of the Interior wetland inventory maps. We are proceeding with the evaluation of these candidate sites. To this end, we have ordered and received current (1999) Broward County tax aerials in order to update each candidate site’s present land use. Through review of these aerials, we have eliminated 13 candidate sites with obvious land use conflicts (i.e., recent development) not shown in the 1994 aerials, and thereby have reduced the number of required candidate site inspections. Field inspection of these candidate sites is scheduled for the weeks of April 10th and April 24th.

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