FIRM Panels

<p>The National Flood Hazard Layer (NFHL) is a geospatial database that
contains current effective flood hazard data. FEMA provides the flood
hazard data to support the National Flood Insurance Program. You can use
the information to better understand your level of flood risk and type
of flooding. The simplest way for you to access the flood hazard data,
including the NFHL, is through <a href='https://msc.fema.gov/'>FEMAs Map Service Center (MSC)</a>.</p><p>If you want to explore the current digital effective flood hazard data in a map, the best tool to use is the <a href='https://msc.fema.gov/nfhl'>NFHL Viewer</a>. From the NFHL Viewer, you may view, download, and print flood maps for your location.</p><p>The NFHL is made from effective flood maps and Letters of Map Change
(LOMC) delivered to communities. NFHL digital data covers over 90
percent of the U.S. population.  New and revised data is being added
continuously. If you need information for areas not covered by the NFHL
data, there may be other <a href='https://msc.fema.gov/portal/resources/productsandtools'>FEMA Flood Hazard Products and Services</a> which provide coverage for those areas.</p><p>A list of the types of data available in the NFHL and information about other ways to access the NFHL may be found in the <a href='https://hazards.fema.gov/femaportal/wps/portal/NFHLWMS'>NFHL GIS Services User Guide</a>.</p><p>If you need more information about individual tables in the NFHL, the FIRM Database Technical Reference, found at FEMA’s <a href='https://www.fema.gov/media-library/assets/documents/34519'>Technical References</a>, includes those details.</p><p>For step-by-step instructions on how to read a flood map, you may view the <a href='https://www.fema.gov/media-library/assets/documents/7984'>How to Read a Flood Insurance Rate Map Tutorial</a>.</p>For more information, please visit the <a href='https://msc.fema.gov/portal/home' target='_blank'>FEMA Flood Map Service Center</a>.

国家洪水灾害图层（National Flood Hazard Layer，NFHL）是收录当前有效洪水灾害数据的地理空间数据库。联邦紧急事务管理局（FEMA）提供此类洪水灾害数据，以支撑国家洪水保险计划。您可借助这些信息更清晰地了解自身面临的洪水风险等级与洪水类型。获取包括NFHL在内的洪水灾害数据的最简途径，是通过<a href="https://msc.fema.gov/">FEMA地图服务中心（Map Service Center，MSC）</a>。
若您希望在地图中浏览当前的数字化有效洪水灾害数据，最佳工具为<a href="https://msc.fema.gov/nfhl">NFHL查看器（NFHL Viewer）</a>。通过该查看器，您可查看、下载并打印所在区域的洪水地图。
NFHL由提交至各社区的有效洪水地图与地图变更函（Letters of Map Change，LOMC）整合构建而成。其数字化数据覆盖了美国90%以上的人口。新数据与经修订的数据集正持续更新入库。若您所需的信息未被NFHL数据覆盖，可使用<a href="https://msc.fema.gov/portal/resources/productsandtools">FEMA洪水灾害产品与服务</a>，此类资源可覆盖上述未覆盖区域。
NFHL所涵盖的数据类型列表，以及其他获取NFHL的途径，可查阅<a href="https://hazards.fema.gov/femaportal/wps/portal/NFHLWMS">NFHL地理信息系统服务用户指南（NFHL GIS Services User Guide）</a>。
若您需要了解NFHL内各数据表的详细信息，FEMA官网的<a href="https://www.fema.gov/media-library/assets/documents/34519">技术参考文档（Technical References）</a>中收录了《洪水保险费率地图（Flood Insurance Rate Map, FIRM）数据库技术参考》，其中包含相关细节。
如需了解阅读洪水地图的分步操作指南，您可参阅<a href="https://www.fema.gov/media-library/assets/documents/7984">《洪水保险费率地图阅读教程》（How to Read a Flood Insurance Rate Map Tutorial）</a>。
如需获取更多信息，请访问<a href="https://msc.fema.gov/portal/home" target="_blank">FEMA洪水地图服务中心（FEMA Flood Map Service Center）</a>。