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SAJWR Ms. Alma Lee Loy approximately 5.3 feet. If the preceding is a correct supposition of the jacks concept, then it is the position of the Corps that the system cannot be considered to be a viable long-term solution to the beach erosion problem occurring at Vero Beach for the following reasons: 1. The submerged multi -pronged units would be a hazard to both navigation and the bathing public. 2. The amount of weve energy dissipated upon the structures would be minimal during normal wave conditions and ineffective during severe storm conditions. 3.• There is the distinct possibility that the structures may become"unstable and be displaced during storm conditions. Effective erosion control measures are expensive. A properly designed offshore breakwater of the massive reinforced concrete tetrapod class could be designed and constructed to withstand the breaking wave energy in the surf zone at Vero Beach. However, the cost of such a structure would be substantially greater than Mr. Jeeves' concept, and for that matter, most of the conceptual alternatives presented at the 10 June 1975 public meeting. We hope the above information will be of assistance to you. Sincerely yours, 5 September 1975 2 Incl ORS CH 1. Concept drawing cti� Chief, Engineering Division 2. Presentation to County Commissioners SAJWR 5 September 1975 Taxpayers Association of Indian. River County, Inc. ATTN: Mr. Theodore Brown P. 0. Box 1751 Vero Beach, Florida 32960 • Gentlemen: • This is in regards to your letter of 22 August 1975 in which you re- quested the following: . "Please send us a copy of your evaluation study report of the 'jacks system' as proposed by Mr. Jeeves, together with cost data and sources of such data. 'Also, please send us a report, together with estimated costs and time to complete, of the method(s) the Corps recommends to control beach erosion in this area ... together with the reasons why for this recommen- dations) and any subsequent or continuing costs, if any, after completion of the first phase(s) of your recommended installation(s).° First of all, it should be stated that the concept of a detached semi - Submerged offshore breakwater, constructed using concrete armor units (tetrapods), in lieu of rubble -mound stone, was considered in the Indian River County Beach Erosion Control and Shore Protection Study. This alter- native provided for the construction of seven tetrapod breakwaters plus provisions for a protective sand beach 40 -feet wide extending from Jaycee Beach Park south to the Riomar Country Club. :It was comparable to Concepts K and L of Inclosure 1. This concept was planned using similar specifica- , tions as were used to design the breakwaters and jetties mentioned on page 1 of Mr. Jeeves' statement to the Indian River Board of County Commissioners on 20 August 1975, (Inclosure 2). The initial estimated cost amounted to approximately $18.000,000.. Because of this staggering figure the concept was thought not to meet the study's planning objectives . and was, therefore, not considered further. .. SEP 1 0 19758001 23 PAGE291, v •