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Comprehensive Plan <br />Coastal Management Element <br />zoning district. As a result, the existing 1:100 powerboat/shoreline density ratio applies to the <br />portion of Zone 6 lying within the Town of Indian River Shores. The portion of Zone 6 lying <br />of watercraft impact to manatees is low since manatee use in this ar is low. Furthermore, there <br />portion Zone 6 lying within the City of Vero Beach. <br />Zone 7 <br />Zone 7 extends south of the North Relief Canal to the 17th Street Bridge, west of the ICW, and is <br />conducive to the siting and expansion of marinas. At the present time, there are plans to expand <br />commercial, recreational or residential marina south of the Grand Harbor Development Due to <br />an overall lack of natural resource constraints and proposed expansion plans, a maximum <br />l <br />Zone 8 <br />Zone 8 extends south of the 17th <br />County line. Although no manatee mortalities attributed to watercraft have been recorded in. <br />• <br />•- • <br />. .... • <br />• <br />Gm IS IMP <br />• <br />• <br />• <br />IN a <br />• <br />• <br />of new marinas within Zone 8. Thus, the existing maximum 1:100 powerboat/shoreline density <br />ratio should be retained for Zone 8. <br />• Zone 9 <br />Zonc 9 extends south of the 17`h <br />County line. The siting of new marinas in Zone 9 is restricted, since most land adjacent to thc <br />IRL has been deemed environmentally sensitive due to the presence of estuarine wetlands. Also, <br />thc probability of manatee impacts with watercraft in Zone 9 is a high. Therefore, the existing <br />fla <br />■ Zone 1 <br />Located in Brevard County and Indian River County, the St. Sebastian River hosts one of the largest <br />aggregations of manatees, and also maintains one of the highest manatee mortality locations within <br />the IRL system. Between 1974 and 2003, seven (7) watercraft -related manatee mortalities (5 in <br />Brevard County, 2 in Indian River County) have occurred within the St. Sebastian River. Seagrass is <br />not abundant within the St. Sebastian River; however, there are shoreline vegetation resources that <br />Indian River County <br />Coastal Management Element Page 78 <br />Supplement # Ordiance #2005-_ Adopted 2005 Exhibit B Page (p <br />