Seven-Day 10-Year Low Flow (7Q10) The period of lowest stream flow during a seven-day interval that is expected to occur once every 10 years. The 7Q10 has a 10-percent chance of occurring in any given year. During this time of low flow, the amount of Dissolved Oxygen in the water would be expected to be the lowest encountered under normal conditions. Since such conditions are considered to be the worst natural case, the dissolved oxygen levels during such episodes are used to establish Ambient Water Quality Standards for that stream.
Source: http://www.bvsde.paho.org/bvsacg/i/fulltext/dicciona/dicciona.pdf
Web site to visit: http://www.state.nv.us/cnr/ndwp/home.htm
Author of the Water Words Dictionary source of text: Gary A. Horton
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