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Comprehensive Plan Coastal Management Element several large expanses of conservation lands within the Coastal Zone. These include: the St. Sebastian River Buffer Preserve, the Cairns Tract, the Oslo Riverfront Conservation Area, the North Sebastian Conservation Area, and the Wabasso Scrub site. There are certain ?:az?:. tions whsimple acquisition to protect habitat is either not practical due to high costs, existing development). These special circumstances may require an ordinance designed to protect a particular species and/or a habitat conservation plan (HCP). For example, the West Indian manatee and sea turtles are two well-known endangered/ threatened species that are being adversely affected by a conflict of use that cannot be resolved via fee simple acquisition of habitat. Manatees are susceptible to injury and death from impacts with boats and propeller wounds. Since 1976, 16 From 1974 through 2003, 28 watercraft -related manatee mortalities were recorded in Indian River County. Areas of the IRL and the St. Sebastian River are known to be important cavorting locations for manatees. Manatee protection speed zones were established in the IRL and St. Sebastian River in 1992 as a means of reducing manatee injuries and mortality and promoting boating safety. "No entry" manatee protection zones that prohibit all boat traffic as a means of providing a secure sanctuary for manatees are in place certain parts of the state. However, there are no plans to prohibit boating in any section of the IRL or St. Sebastian River in Indian River County. Additionally, In August 2000, the Indian River County adopted a Indian River County Manatee Protection and Boat Safety Comprehensive Plan (MCP).will be adopted by 1998. That plan X11 addresses boat/marina facility siting, habitat conservation, and educational awareness. Lighting from oceanfront development can disorient sea turtle hatchlings and thus contribute to sea turtle mortality. Indian River County's Sea Turtle Protection ordinance (LDR Section 932.09) restricts illuminating beach areas during the sea turtle nesting - from March 1st through October 31th of each year. Vehicular access onto the beach is also prohibited in the unincorporated county, to reduce potential human impacts to turtle nesting areas. LAND USE The coastal mainland will most likely continue to experience a westward development expansion. However, most of the land located outside the current boundaries of the Urban Service Area (USA), especially west of Interstate 95, is expected to remain largely undeveloped as agricultural land. Thus, the majority (over 90 percent) of future development in Indian River County will be located within the designated Coastal Zone. According to projections contained in the Housing Element, by the year 2020 the amount of single-family land needed is expected to increase from 13,289 acres to 19,522 acres. The amount of land needed for multiple -family residential development is expected to increase from 1,374 acres to 2,018 during the 20 year planning horizon. By the year 2020, acreage for mobile homes is anticipated to increase from 1,750 acres to 2,571 acres. Combined, there will be a need for Indian River County Coastal Management Element Page 71 Supplement # Ordiance #2005-_ Adopted 2005 Exhibit B Page 2