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from just two year's data to attach any significanc e to this change, but the consistency of it will be checked during Phase II- Part B. Figure 44, shows the means for the two seasons plotted versus station, while Figure 45 shows the respective means for the two seasons plotted as a function of station altitude, The altitude dependence doe s not appear to have shifted'during this past season, and the nominal slopes derived from the Phase I data remain valid. Stream gage s we re installed by the U, S. Geological Survey during the past summer on Service Creek, Spring Creek and Walton Creek. Spring Creek and Walton Creek help drain the target watershed and Service Creek will be used as a control. The 1965- 66 winter season precipitation was much below normal, and so was the run-off of .melt waters; therefore, gage calibration (height of water in stillwell versus cubic feet per second discharge) was determined only for the low end of the operating scale. The part of the calibrations available are shown in Figure 46, These calibration points were made through- out the winter season from November to May. The discharge at the time of measurement is shown in Figure 47, It is interesting to note that the run-off begins to increase just before the end of March. The snowcourse measurements of the Soil Conservation Service indicate the maximum snow pack on the ridge was on March 30, 1966. The preliminary data obtained this season will serve as the basis for detailed comparisons of watershed outputs in the 1966- 67 season. DIFFUSION DATA The diffusion test series started during Phase I was continued during Phase II to describe the transport and dispersion processes in the mountain- ous area of the project. As in Phase I, VSRC No, 2267 zinc-cadmium sul- fide tracer material particles consisting of approximately 2 microns mean - 76 - I I I I I I I, I I I I I I I I I II I I