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C�] 40 Indian River County Manatee Protection and [coating Safety Comprehensive Management Plan Results of the Screening Process The establishment of these marina siting zones was done after review of all the aforementioned information and data. The public should use these zones as guidelines for the purpose of determining where new, expanded, or rearranged boating facilities might be located. The specific site -by -site criteria netted previously and in Section 1,2 of the Action Plan may result in a different result than by just relying on the zones themselves. As a hypothetical example: A potential marina site is found in Zone 3, where no powerboat to shoreline ratio is automatically applied. The site -by -site criteria is applied and it is found that the site is within a Nigh Manatee Use area. One modification might be to establish a maximum powerboat to shoreline ratio of 1:100, for this particular marina, in order to protect the manatee. ]t is important to note that the absence of an applied powerboat to shoreline ratio does not imply large numbers or unlimited number of boats will be alloyed.. Zone 1 Located in Brevard County and Indian River County, the St. Sebastian River hosts one of the largest aggregations of manatees, and also maintains one of the highest manatee mortality locations within the IRL system. Between 1974 and 1998, seven (7) watercraft -related manatee mortalities (5 in Brevard County, 2 in Indian River County) have occurred within the St. Sebastian River. Due to the remote locations of Dale 'Wimbrow Park and Donald MacDonald Park, these boat ramps are the least used launch sites in the county. Due to low on -water traffic, high manatee mortality, and high natural resource constraints, Zone l is not a conducive area for siting new boat facilities. The siting of any new or the expansion, or rearrangement, of existing boat facilities (marinas) should be prohibited. However, the siting of new or the expansion, or rearrangement, of existing low -impact boat facilities, such as a canoe launch should not be precluded. Zonae 2 Based on historic manatee mortality data and telemetry data, the probability of manatee mortality for Zone 2 is low. However, the presence of dense seagrass beds, approved shellfish harvesting areas, and wildlife associated with the Pelican Island National Wildlife; Refuge prohibit the siting of new boat facilities within Zone 2. The existing maximum 1:100 powerboat/shoreline density ratio should be retained for Zone 2. Zone 3 Zone 3 is the area most conducive for expanding existing boat facilities in the county for the following are reasons. First, there are few natural resource constraints. Relative to the overall county, there is relatively little mangrove fringe, and seagrass beds are sparse along the western shoreline of the IRL in the City of Sebastianinorthem Indian River County area. Furthermore, existing marina channels are several feet deeper than the average adjacent water depth of one (1) to two (2) feet. Approximately 500 yards from the City of Sebastian shoreline, the water depth increases to four (4) to five (5) feet. Second, existing marinas Community Development Department Page 55