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f C-1 Indian 'River County Manatee Protection and Boating Safety Comprehensive Management Pian located within Zone 3 are proximate to the ICW and Sebastian Inlet. Third, although the 11 commercial, recreational and residential marinas in Zone 3 generate the highest level of on - water traffic attributed to marinas in the county, only four (4) watercraft -related manatee mortalities have been recorded in Zone 3. The proximity to the inlet and the existing speed zones should offset the potential impacts of higher boat densities. It should be noted that there is little potential for dry slip expansion in the City of Sebastian due to the closeness of Indian River Drive, However, existing commercial and recreational marinas could increase their number of wet slips, and utilize adjacent parcels along the IRL or west of Indian River Drive to expand upland facilities. Because of the need to increase wet slips, a maximum shoreline/ density ratio should not be applied to Zone 3. Zone 4 Generally, tone 4 is not favorable for siting or expanding boat facilities, and there are no plans to site or expand boat facilities within this zone at the present time. Although seagrass coverage is sparse in the Jungle Trail Narrows section of the IRL, manatee abundance is significant. Large numbers of manatees have also been observed in the seagrass-covered coves of Johns Island, west of Pople Point and within McCullery Cove. Five (5) watercraft - related manatee mortalities were documented in or near the Indian River Narrows. father constraints include the presence of archeological and historic resources, including Jungle Trail, and shoreline erosion. There are no properties in Zone 4 with a commercial land use designation, thus recreational and commercial marinas are prohibited in Zone 4. The existing maximum 1;100 powerboat/shoreline density ratio should be retained and applied to any proposed siting of a new residential marina in Zone 4. Zone 5 The area along the western shoreline of Zone 5 exhibits sparse seagrass beds and low manatee use. As a result, the probability of watercraft -related impacts to manatees is low; however, five (5) watercraft -related mortalities have been documented east of the zone. Since this area is south of the Wabasso Causeway (C.R. 51.0), water circulation and flushing from the inlet are minimal. Although water quality is a concern, water quality impacts are evaluated on a site -by -site basis and can be mitigated with proper design. Therefore, water quality issues would not prohibit the siting of a residential marina in Zone 5. There is the potential to site new residential marinas and/or expand existing marinas within Zone 5. However, the absence of commercially zoned properties in Zone 5 limits marina siting and expansion to residential marinas, or public boat ramps. Due to a lack of natural resource constraints, a maximum powerboat/shoreline density ratio should not be applied to Zone 5. Community Development Department Page 56