Duration Curve
Water
A cumulative frequency curve that shows the percent of time during which specified units of items (e.g. discharge, head, power, etc.) were equaled or exceeded in a given period. It is the integral of the frequency diagram.
- — Service Hydrologist Reference Manual Glossary of Hydrologic Terms retrieved 2014-06-01
Weather
In hydrologic terms, a cumulative frequency curve that shows the percent of time during which specified units of items (e.g. discharge, head, power,etc.) were equaled or exceeded in a given period. It is the integral of the frequency diagram.