RIVERHEAD - Riverhead residents are still waiting for millions of dollars in federal aid promised to them after floodwaters destroyed their homes in 2010. The federal government has agreed to buy several homes on Horton Avenue, tear them down and use the properties as a giant catch basin for future storm runoff. However, residents say additional paperwork is delaying the process at the local level before the purchase can go into effect. About 10 homeowners were forced to leave their homes, and many say they are hoping to get residences under Suffolk County's affordable housing program.FEMA aid approved for flooded out Riverhead residents