Flood Revisions (LOMC)

This coverage was begun in March of 1998 for the Permit and Information Center (PIC) staff to keep track of the parcels that had successfully filed a Letter of Map Amendment (LOMA) and been granted a Letter of Map Revision (LOMR). A LOMA is an official revision by letter to a current Flood Insurance Rate Map (FIRM). A LOMA results from an administrative procedure that involves the review of scientific or technical data submitted by the owner or lessee of property who believes the property has incorrectly been included in a designated Special Flood Hazard Area (SFHA). A LOMA amends the current FIRM map and establishes that a specific property is not located in an SFHA. A LOMR is an official revision to the current FIRM. It is used to change flood zones, floodplain and floodway delineations, flood elevations, and planimetric features.本数据集的覆盖范围始于1998年3月，旨在供许可与信息中心（Permit and Information Center, PIC）工作人员追踪已成功提交地图修改函（Letter of Map Amendment, LOMA）并获批地图修订函（Letter of Map Revision, LOMR）的地块信息。地图修改函（LOMA）是针对现行洪水保险费率图（Flood Insurance Rate Map, FIRM）的正式信函式修订文件。LOMA源自一项行政流程，该流程需审核财产所有者或承租人提交的科学或技术数据——此类主体认为自身财产被错误划入指定的特殊洪水危险区（Special Flood Hazard Area, SFHA）。LOMA可对现行FIRM进行修订，并明确特定财产不在特殊洪水危险区（SFHA）范围内。地图修订函（LOMR）是针对现行FIRM的正式修订文件，可用于调整洪水区、洪泛区与行洪道划定范围、洪水水位高程及平面地物要素。