. L'utilisation des terres forestières et de débit dans le centre de l'Oregon. Les forêts et la foresterie Oregon Ochoco Creek Watershed utilisation multiple ; la gestion des bassins versants de l'Oregon Ochoco Creek Watershed ; mesures de flux Oregon Ochoco Creek Watershed. 20 40 60 flux cumulatif (pouces), réservoir d'Ochoco Figure 7.--Double-masse de la courbe des précipitations et d'entrée du réservoir. E a u 600. 500. 400- 300. 200. 100-. Je 1941-42 20 40 J 60 80 J 100 120 -r apport cumulatif (pouces), réservoir d'Ochoco Figure 8.- Double-masse de la courbe des précipitations et d'entrée du réservoir. Double-Mass l'analyse concernant les précipitations à gamme Ochoco

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. Forest land use and streamflow in central Oregon. Forests and forestry Oregon Ochoco Creek Watershed Multiple use; Watershed management Oregon Ochoco Creek Watershed; Stream measurements Oregon Ochoco Creek Watershed. 20 40 60 Cumulative inflow (inches), Ochoco Reservoir Figure 7.--Double-mass curve of precipitation and reservoir inflow. E a u 600. 500. 400- 300. 200. 100-. 1941-42 I 20 40 I 60 80 I 100 —r 120 Cumulative inflow (inches), Ochoco Reservoir Figure 8.- Double-mass curve of precipitation and reservoir inflow. Double-Mass Analysis An analysis relating precipitation at Ochoco Ranger Station to Ochoco Reservoir inflow would be desirable, because that station is located near the center of the basin. However, since precipitation records prior to 1937 are not available, it became necessary to use the longer Prineville precipi- tation records in the analysis. When the double-mass curve is used in an analysis of precipitation-runoff relations or streamflow trends, the cumulative measured flow should be plotted against a cumulative computed or pattern flow based on some determined precipitation-runoff relation. A variable ratio between precipitation and streamflow violates the theory of double- mass analysis. A means for computing pattern inflow at Ochoco Reservoir was developed by relating cumulative annual precipitation at Prineville to cumulative annual reservoir inflow for water years 1922 to 1942 (see fig. 7) through a least squares fit linear regression.3 This regression equation was then used in com- puting cumulative pattern inflow for each water year from 1922 to 1965. Figure 9 is the resulting double-mass plot of computed pattern inflow against meas- ured inflow into Ochoco Reservoir. A number of year-to-year breaks are evident in figure 9. However, most users of double-mass curves recognize that short-term changes can be due to chance and generally choose to ignore breaks persisting for less than 5 years. Two distinct slope breaks persisting for mo

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