The paper presents relation between evaporation stated by two different and independent methods: calculated one on the basis of profile meteorological elements measurement and pan evaporation. The relationship between daily amounts of these kind of evaporation strong and for short period (i.e. 30 minute amounts) has two.
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The paper presents results of potential evaporation measured by the use of class A pan evaprimeter for the period 1997-1999 in Ursynów WAU and Wild evaporimeter for period 1961-1963 in Przemyśl. Mean monthly sums daytime and night-time evaporation (state on the base of sunrise and sunset time) of class A pan evaporimeter are presented in table 1. Mean rate of night-time evaporation amounts 7,7% for class A pan evaporimeter and 13,5% for Wild evaporimeter and rate of daytime evaporation for these instruments amounts 92,3% and 86,5% respectively. Conduction of evaporation measurement at noon sharp allows to compare values of forenoon evaporation (AM) to afternoon evaporation (AM). Forenoon evaporation is 50% less than afternoon one for Wild’s evaporimeter and 80% less for class A pan evaporimeter.
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