Two factory-built housing communities in Broward County, Florida, may be in the high decibel path of a new jet runway proposed for the Fort Lauderdale/Hollywood International Airport.  They are not in the physical path, but the county nevertheless wants the land.  Some residents have invested thousands  of dollars enlarging and enhancing their homes, including one with a $4,500 waterfall, and clearly don’t want to move.  According to Sun Sentinel.com, the 269-home Ocean Waterways Mobile Home Park [a misnomer for this high-end community] has four owners and 181 members who own a 53-year lease on the land.  The other community has one owner.  Although residents could receive relocation assistance, Broward Aviation Director Kent George recently said they all must go, or they all must stay, and live with the noise.  He told them the dollar amounts would not be discussed until the residents have an agreement with the owners, something one of the residents called an overwhelming task.  The runway plan will be brought to a vote by the County Commission in March.