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<br />S.OSURFACE W ATE12--Continued <br />5.2 Low Ffow, High Flow <br />A Frequency Curve Relates Magnitude of a Variable to the <br />Frequency of Occurrence <br />Frequency curves are used to estimate the probability that a particular minimum <br />or maximum streamllow will occur in any future year. <br />Frequency curves can be developed from availa- <br />ble recorded streamllow data. Low-flow (requency <br />information can be used to evaluate a stream's <br />adequacy (o supply water for various uses such as <br />municipal supplies, industrial supplies, irrigation <br />supplies, waste dilution, and wildlife conservation. <br />Information on a stream's high-flow characteristics <br />is useful in the design of dams, reservoirs, and <br />flood-control and navigation channels. <br />Low-flow and ttiglt-flow frequency for the Pur- <br />gatoire River at Trinidad, Colo., for the period of <br />record, is illustrated in figure 5.2-1. Families of <br />curves are shown (or low flows oC 3-, 7-, 14-, and <br />30-day mean discharges and for high flows of 3-, 4-, <br />IS-, and 30-day means. <br />Low-flow frequencies and high-flow Frequencies <br />for selected streamflow-gaging stations in Area 61 <br />are listed in table 5.2-1. Flows at these stations are <br />considered to be representative of flows of perennial <br />streams in the area. Location of the streamllow gages <br />is shown on the accompanying map. <br />