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‘Snow ageing’ is an effect of snow crystals changing. Temperature and liquid water are important in this process. New snow has often a density of 0.1 kg/L (1 cm snow = 1 mm water). However, as winter goes by the density increases as shown in Table 5. When density is close to 0.4 kg/L, liquid water runs through the snowpack (Otnes & Ræstad 1978). On the other hand, as this investigation shows, runoff may happen even when snow density is less. Runoff was usually going on from late February to the beginning of April, with the largest peak late March.

Table 5

Snow water equivalents (SWE) through the SCP 2017/18

DateFeb. 13Mar. 10Mar. 25Mar. 29April 7April 9
Density (kg/L) 0.17 0.24 0.22 0.26 0.37 0.40 
DateFeb. 13Mar. 10Mar. 25Mar. 29April 7April 9
Density (kg/L) 0.17 0.24 0.22 0.26 0.37 0.40 

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