| OCR Text |
Show From Tables 13- 14 it can be seen that pulverized snow avalanches are the most frequent, representing one half of all avalanches of known type. Their average volume is one fourth that of the total number ( registered). Wet snow avalanches are one half as frequent as pulverized snow avlanches of the same average size. " Lump snow" avalanches are about one fifth as frequent as those of pulverized snow, but their volume is, in general, one half that of all the avalanches observed. The remaining avalanche types, 20% of the total number, represent only 2% of the total of avalanche snow. Table 13" Frequency of " Knurled Snow" and " Rolypoly Snow" Avalanches by Decades Month Decade Avalanche Type " Knurled Snow" I 4 March II III 3 3 I 5 April II III 11 7 I 4 May II 7 III June II III " Rolypoly Snow" 3 3 8 7 6 4 Table 14 Average Volume of Avalanches ( in 1000' s m3) by Months Month November December January February March April May Avalanche Type Pulverized and " Slab Snow" 3,8 " Lump Snow" Wet Snow 4,8 10,0 _ 5,3 17,6 _ 2,9 33,6 _ 1,2 50,0 - 1,3 8,5 7,2 0,5 2- 7 The earliest date recorded for a pulverized snow avalanche is October 20. This type of avalanche is in general the earliest observed. The slide of October 20 was 4000 m3 in volume and was followed the next day by one of 10,000 m3. The latest date recorded for an avalanche of this type was May 20. For the other avalanche types the earliest and latest dates are as follows: " Lump snow" avalanches Dec. 17 April 6 - 55- |
