1 Oct 2018 OCTOBER 2018 NFIP FLOOD INSURANCE MANUAL. F • 1. Appendix F: The Community Rating System (CRS) is a voluntary program for communities participating in the National Flood Insurance Program (NFIP). The CRSNational Flood Insurance Program (NFIP) Community Rating System (CRS) Coordinator’s Manual. Cover photo for the document: National Flood Insurance