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PLANNER REDICK APPROACHED THE BOARD AND PRESENTED HIS REPORT <br />ON SAN SEBASTIAN SPRINGS, WHICH IS HEREBY ATTACHED, CONCERNING THE EFFECT <br />OF FILLING LAND UP AND DOWN THE SEBASTIAN RIVER. <br />BOARD OF COUNTY COMMISSIONERS <br />WILLIAM C. WOOTKE. JR.. Chairman <br />ALMA LEE LOY. Vice Chairman <br />WILLIARD W. SIEBERT. JR. <br />R. DON DEESON <br />PATRICK B. LYONS <br />JACK G. JENNINGS. Administrator 2145 14th Avenue Vero Beach. Florida 32960 <br />February 19, 1979 <br />MEMO <br />T0: Board of County Commissioners <br />FROM: Stan Redick, Planning Pkning Director <br />SUBJECT: San Sebastian Highlands and Filling of Land in the Sebastian <br />Raver Floodplain <br />This report is designed to inform the Board (1) of the situation in the <br />Sebastian River Floodplain, (2) of the existing regulations affecting fill <br />within the floodplain, (3) the potential danger of such fill and (4) possible <br />regulations needed by the county to control filling of land in floodplain areas. <br />The official floodplain shown by the Flood Protection Maps of HUD shows a 6' <br />flood elevation in the north portion of the Sebastian River and a 5' elevation <br />• in the upstream reaches. San Sebastian Highlands is in this latter area. These <br />Floodplain Maps are based, however, on a hurricane surge and if a heavy rainfall <br />came in association with the hurricane surge, upstream flood elevations would <br />probably be higher. Exact elevations cannot be determined without hydrological <br />studies. <br />Telephone conversations with possible regulatory agencies resulted in the deter- <br />mination that neither the Corps of Engineers, the Fla. Dept. of Environmental <br />Regulation, nor the St. Johns River Water Management District will regulate or <br />require permits for the filling of land in the Sebastian River area if such fill <br />is above the mean high water level. <br />` There are two major problems which may result from filling of a floodplain. <br />These are (1) increase in the flood elevation and (2) sedimentation of the down- <br />stream area. Thus such fill could increase the flood hazard of the stream and <br />degrade the quality of water in both the Sebastian and .Indian Rivers. <br />Filling of land in a floodplain creates a constriction to flow of flood waters <br />36 <br />K e�9 PAGE l <br />