Flood Hazard Areas

This hosted feature layer has been published in RI State Plane Feet NAD 83. Statewide flood hazard areas compiled from county-based Digital Flood Insurance Rate Map (DFIRM) databases for Rhode Island. The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA), and in this case redistributed by the Rhode Island Geographic Information System (RIGIS) at the request of the Rhode Island Emergency Management Agency. This dataset provides the user with information on the flood risk hazard zones throughout the state of Rhode Island. Note: the above summary is a slightly modified version adapted from source metadata records provided by FEMA. To provide the user with information on the statewide flood risk based on information provided by the Federal Emergency Management Agency (FEMA) in the DFIRM databases created specifically for the five counties of Rhode Island (Bristol, Kent, Newport, Providence, and Washington). This dataset provides information on the likelihood that a flood may occur at a given location in the state. The files and information used to create this dataset were originally provided to the Rhode Island Emergency Management Agency (RIEMA) by FEMA. This information was in the form of DFIRM databases for each of the five RI counties. This information was then redistributed by RIGIS at the request of RIEMA. The information provided by this data is only a subset of the information available in the original DFIRM databases located on the RIGIS website. For a specific county's complete DFIRM database, please visit the RIGIS website and download the appropriate DFIRM database. This metadata record is specific to this dataset and only contains information relevant to this dataset as provided by FEMA the original DFIRM metadata records. These can be found and referenced in the /DOCUMENT folder that is downloaded as part of a DFIRM package for a specific Rhode Island county. Another valuable source of documentation is FEMA's "Guidelines and Specifications for Flood Hazard Mapping Partners". It is currently available online at https://www.fema.gov/guidelines-and-standards-flood-risk-analysis-and-mapping. The Guide offers a tremendous amount of information regarding how DFIRM data are created, and detailed information about the individual files that constitute a DFIRM database.本托管要素图层采用NAD 83基准下的罗德岛州平面英尺坐标系发布。本数据集为罗德岛州基于各县数字洪水保险费率图（Digital Flood Insurance Rate Map，DFIRM）数据库汇编的全州洪水灾害区域数据。数字洪水保险费率图数据库用于呈现用于生成洪水风险数据的相关信息及配套支撑数据。其核心风险分类包括年超越概率1%的洪水事件、年超越概率0.2%的洪水事件，以及最低洪水风险区域。该DFIRM数据库源自洪水保险研究报告（Flood Insurance Studies，FISs）、此前发布的洪水保险费率图（Flood Insurance Rate Maps，FIRMs）、为支撑FISs与FIRMs开展的洪水灾害分析，以及可获取的最新测绘数据。上述FISs与FIRMs由美国联邦紧急事务管理局（Federal Emergency Management Agency，FEMA）发布，本次由罗德岛州地理信息系统（Rhode Island Geographic Information System，RIGIS）应罗德岛州应急管理局（Rhode Island Emergency Management Agency，RIEMA）的请求完成再分发。本数据集可为用户提供罗德岛州全域的洪水风险灾害分区信息。注：本摘要源自FEMA提供的原始元数据记录，经小幅修改后适配本数据集。本数据集基于FEMA为罗德岛州5个县（布里斯托尔、肯特、纽波特、普罗维登斯、华盛顿）创建的DFIRM数据库中的信息，为用户提供全州洪水风险相关信息。本数据集可提供该州任意指定位置发生洪水的概率相关信息。用于构建本数据集的文件与信息最初由FEMA提供给RIEMA。该信息以覆盖罗德岛州5个县的DFIRM数据库形式提供。随后RIGIS应RIEMA的请求完成了该信息的再分发。本数据集仅为RIGIS官网原始DFIRM数据库中可用信息的子集。若需获取特定县的完整DFIRM数据库，请访问RIGIS官网并下载对应数据库文件。本元数据记录仅针对本数据集，仅包含FEMA原始DFIRM元数据记录中与本数据集相关的内容。相关内容可在下载特定罗德岛州县DFIRM数据包时一并获取的/DOCUMENT文件夹中查阅参考。另一极具参考价值的文档资源为FEMA发布的《洪水灾害测绘合作伙伴指南与规范》（Guidelines and Specifications for Flood Hazard Mapping Partners），当前可通过https://www.fema.gov/guidelines-and-standards-flood-risk-analysis-and-mapping在线获取。该指南详细阐述了DFIRM数据的生成流程，并对构成DFIRM数据库的各类文件提供了细致说明。