FEMA Floodway - Open Data

A "Regulatory Floodway" means the channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than a designated height. For more information, visit FEMA's glossary of terms: https://www.fema.gov/glossary/floodway. Updated Quarterly.监管行洪通道（Regulatory Floodway）指为宣泄基准洪水且不使水面高程累计超出指定限值，必须予以预留的河道或其他水道及其毗邻陆域。如需获取更多信息，请访问美国联邦应急管理局（Federal Emergency Management Agency，简称FEMA）术语词典：https://www.fema.gov/glossary/floodway。本数据集每季度更新一次。