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<br />\ . <br /> <br />". <br /> <br />A consistent pattern of month by month snowpack increases in the mid and <br />upper elevations of the Project Seeding Area greater than those snowpack <br />incrertses in the San Juans surr0unding the Project Area can be seen in <br />Figures 3, 4, &5 In Figures 3, 4, & 5 ' the snowcourse sites East of <br />the C0ntinentrtl Divide were averaged to dp.ter'nine the normal fifteen <br />year average monthly change in snowpack for comparison to this seasons <br />actual changes. This same procedure 'was completed for thnse snowcourse <br />sites West 0f the Continental Divide. In Figure 2. the procedure was <br />the same but the time period calculated was for three ~onths. <br /> <br />Figures 6, 1, 8, & 9 present the actual Feb. 1, 1916, }lar. 1. 1916, <br />Apr. 1, 1916 and }lay 1, 1916 saowcourse obsprvati0ns as a percent of <br />n0rmal using the S.C.S. fifteen ,year averages (195~-1912). <br /> <br />In summary, there is ab0ut a 32% greater average snowoack in the Project <br />Seeding Area as of May 1, 1916 than there is in the averase snowpack in <br />the surrounding San Juan Region. This was due in part to a greater <br />occurrence of precipitation events favorable for seeding and precipitation <br />in the Project area than expected on an average. Many of these favorable <br />storm events had ideal conditions for seeding and precipitation augmentation. <br />On the basis of comparitive changes in the snowpacks both in the Project <br />Area and in the region surr0unding the Project Area and the frequent occur- <br />rence of ideal seeding conditions, it is estimated the seeding program <br />added in excess of 5% to the 1915-16 winter season's snowpack (the range <br />of estimated seeding affects on the season's snowpack in the mid and upper <br />elevations in the Project Area is from 9 to 11%). <br /> <br />5 <br />