Dam

"Any artificial barrier which impounds or diverts water. The dam is generally hydrologically significant if it is: 1. 25 feet or more in height from the natural bed of the stream and has a storage of at least 15 acre-feet. 2. Or has an impounding capacity of 50 acre-feet or more and is at least six feet above the natural bed of the stream." (National Oceanic and Atmospheric Administration, 2019)

Sources

National Oceanic and Atmospheric Administration (NOAA). Glossary of Hyfrologic Terms. Accessed February 28, 2019. Available at: https://www.nws.noaa.gov/om/hod/SHManual/SHMan014_glossary.htm