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-I MAY 8 1985 BOOK 60 P{,,,E 857 DISCUSSION RE INTERIM CONTROL LINE Ellie Van Os, Conservation Chairman of the Pelican Island Audubon Society, read aloud the following letter dated May 1, 1985: PELICAN ISLAND AUDUBON SOCIETY P. 0. Box 1833 VERO BEACH, FLORIDA 32960 !..4 '' May 8, 1985 Indian River County Board of County Commissioners 1840 25th St. Vero Beach, FL 32960 Dear Board Members, It is the will of the Conservation Committee of the Pelican Island Audubon Society to request that the County Commission ask the State Department of Natural Resources to devel.op an Interim Control Line for Indian River County. The Coastal Construction Setback Line was last delineated in 1974 (according to the Status Overview of Indian River County). In the late seventies, the state charged DNR with restudying that line every five years, but the usual reasons including manpower, have pushed the next scheduled review to September of 1986, a date described as optimistic. The Interim Control Line would be based on the "landward limit of the impact zone of a 100 -year storm event", the same criteria that would be used to describe the new Coastal Construction Control Line in 1986. To picture this line, when a wave breaks even on a calm summer day there is an obvious trough where the maximum energy of the wave impacts the shoreline; beyond that the wave flattens as it reaches farther up the beach. In this case, the Interim Control Line is the landward limit of that impact zone for a 100 -year storm event and does not necessarily delineate where the wave would actually stop. You may ask the relationship between the Thanksgiving storm and the Interim Control Line. As it was described to me by Paden Woodruff with the Division of Beaches and Shores in theDepartment of Natural Resources in Tallahassee, the Thanksgiving.storm was not a 100 -year storm event. In all respects it was a typical northeastern storm, their duration being notably longer than hurricane events and as such the erosive damage of four northeastern storms can often exceed that of a hurricane. However, because of the extensive damage caused by the storm, many surveys were made in its aftermath. The Department has an array of historical profiles and survey information that coupled with these most recent surveys would be utilized to determine the alignment. Mr. Woodruff also made a point to distinquish between what were formerly called setback lines and are now called control lines. Setback denotes a line of prohibition, but what the State intends with a control line is that instead of the State prohibiting development seaward of the line (an option left open to the local governing body), they primarily insist on -compliance with Coastal Construction Standards, hence the need for state review. 62