Low-flow frequency curve.--A graph showing the relation between the magnitude and frequency of the annual lowest mean flow for a given number of consecutive days. Low-flow frequency is expressed as the average interval, in years, between recurrence of an annual minimum flow less than that shown by the magnitude scale. The low-flow frequency relation is commonly presented as a family of curves with a separate curve for each number of consecutive days.Partial-record site.--A location on a stream, canal, lake or reservoir where limited streamflow data, usually consisting of streamflow measurements, are collected over a period of years for use in hydrologic analysis.Regulation. The artificial manipulation of the flow of a stream, such as, by the operation of reservoirs, cranberry bogs, or artificial lakes.Recurrence interval. The time interval, in years, within which a given hydrologic event will, on the average, be less or more than a given value one time. It is the reciprocal of the probability that the given hydrologic event will not be exceeded or will be exceeded in any one year. For example, a 20-year low-flow is one that has a 5 percent chance of not being exceeded in any one year.Water year. The 12-month period, October 1 through September 30, designated by the calendar year in which it ends.
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