There is a lot of technical information and complicated concepts regarding flood maps and flood insurance. Please see below for helpful links to information to help with that understanding and point you to other resources to better understand your risk.
If you are an owner of a 1-4 family home and you still have questions after speaking with an insurance agent, the Center for NYC Neighborhoods, creator of FloodHelpNY.org, can connect you to free housing counseling and legal services.
NYC Mayor's Office of Housing Recovery Operations
NYC Department of City Planning Resilient Neighborhood Initiative
NYC Department of Buildings: Rebuilding After Hurricane Sandy