precipitation and time of year (an index for
available
net radiation) (Vehviläinen and Huttunen, 1997). This
equation has been calibrated and verified against observations of
Class A pan evaporation values (Vehviläinen and Huttunen,
1997). The actual evaporation is calculated from potential evapora-
tion and the soil moisture deficit. The changes in temperature and
precipitation affect
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