 Image Number D2404-1 |
A farmer’s subsurface drain pipe. Subsurface drainage may account for 50 percent of the stream flow in midwestern watersheds.
Photo by Peggy Greb.
An official website of the United States government
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
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.