. Foresta Uso di terra e streamflow nel centro di Oregon. Le foreste e la silvicoltura Oregon Ochoco Creek Watershed uso multiplo; Gestione di Spartiacque Oregon Ochoco Creek spartiacque; le misurazioni del flusso di Oregon Ochoco Creek Watershed. Durante la sequenza di tracciati, o a causa di un cambiamento nella raccolta dati tecniche o a qualche cambiamento fisico, una rottura o cambiamento nella pendenza apparirà. Test statistici di signifi- annulla della pendenza apparente rotture possono essere effettuati (16). Relazioni Precipitation-Runoff stazioni di precipitazione entro o adiacente all'Ochoco Creek bacino, con periodi di record a lungo abbastanza per essere

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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. during the plotted sequence, due either to a change in data collecting techniques or to some physical change, a break or change in slope will appear. Statistical tests for signifi- cance of apparent slope breaks can be made (16). Precipitation-Runoff Relations Precipitation stations within or closely adjacent to the Ochoco Creek basin, with periods of records long enough to be useful in analysis, are at Prineville, Oreg. (1897 to present) and Ochoco Ranger Station (1936 to present). Annual precipitation amounts recorded at these locations appear in table 4. Ochoco Reservoir, essentially containing the outflow of Ochoco Creek, has been in continuous operation by the Ochoco Irriga- tion District since 1920. Records of reservoir level, flow in irrigation feed canals, and flow of Ochoco Creek below the reservoir are convertible to reservoir inflow. Annual in- flows for water years2 1922-65 are shown in table 4. 600. â S 500 400 300. a 200. E u 100 1956-57 ;*. 100 200 300 400 500 Cumulative precipitation (inches). Prineville. Oregon Figure 6.-Double-mass curve of precipitation data. The first step in analysis of Ochoco Creek hydrologic data was to check the consist- ency of precipitation records at Prineville and Ochoco Ranger Stations. A double-mass plot (fig. 6) of the annual precipitation report of these two stations shows a distinct slope break at the water year 1957. The double-mass plotting of each of these sta- tions individually against a third station, nearby but outside the Ochoco drainage, determined that the slope break was attrib- utable to a change at the Prineville station. Subsequent inquiry disclosed that about 1956 the Prineville station was moved nearly 3 miles to a new Weather Bureau cooperator location. The curve in figure 6 was used

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