To adhere to the City of Madeira Beach Floodplain Ordinance & FEMA appraisal requirements for the FEMA 50% rule, āSubstantial Improvement /Substantial Damageā, the appraisal must adhere to the following: Be developed in general accordance with FEMA P-758, most recent edition, section 4.5.3 for Actual Cash Value (ACV) based on replication/replacement of existing structure, no...