1999-017 - Laserfiche WebLink

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C> 0 0 The total sand volume recommended to initially restore the shoreline sectors envisioned to receive sand is approximately 1.89 million cubic yards. The borrow area(s) for this sand will be identified by Indian River County in a study to be initiated in December 1998, with field work to commence in Spring 1999. Once borrow area(s) locations relative to sectors planned for sand placement are determined, the critical design factors including pumping distances, sand quality and quantity, and nearshore hardbottom characterizations will allow project estimates to be refined. The beachfill projects are assumed to require approximately 1.95 million cubic yards of sand ,placed along a total of approximately 41,000 feet (7.8 miles) of the Indian River County Atlantic Ocean shoreline. Exact construction berm elevations and widths will be dependent upon sand quality and shoreline conditions at the time of preliminary design. Unit beachfill volumes at this iLMiCture a,ppeai io range between approximately 4th to 53 cubic yard's per front foot of shoreline, The above values were determined following analysis of existing conditions and modification of project boundaries (and the requisite beachfill volumes) from those sectors identified in the .BPP. In contrast to the beachfill parameters cited above (as presented in the BPP Update), the total estimated shoreline length requiring beachfill was 36,000 feet (0.8 miles), with 1.51 million cubic yards placed in unit sectors varying from ten (10) to 80 cubic yards of sand per front foot. The orientation, length, individual weight specification (range of acceptable weights) of armor stone and the on -center spacing of shore protection structures„ as well as the total number of structures to be buiit in Sector 7, can only be adequately determined through detailed design procedures. Wave refraction/ diffraction and shoreline evolution modeling will likely be required to establish such design parameters and to additionally satisfy regulatory agency evaluation of the structures' function and benefits to the Sector 7 project.