The Federal Emergency Management Agency plans to issue a new flood map designation that would basically stop all new construction – from shopping centers to single-family homes – in the flood-prone area, one of the fastest-growing communities in the four-county region during the past decade. The new federal mandate would also require flood insurance for all buildings with federally backed mortgages. Sacramento city leaders criticized FEMA and the Army Corps of Engineers, saying the city, and Sacramento and Sutter counties have taken measures to improve flood protection in hopes of receiving a less-restrictive designation that would allow for infill development.