U.S. flag

美国政府的官方网站

Dot gov

Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS

A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites..

alert - warning

此页面尚未翻译成[简体中文. 前往 简体中文 页面以该语言获取资源。

Masonry Walls

Walls constructed of individual components laid in and bound together with mortar. These components can be brick, stone, concrete block, etc.

Glossary Section
NFIP - National Flood Insurance Program