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Precipitation is one element of water balance and evapotranspiration like vapour from different surface type especially standard grassing is further significant element of water balance. FAO methodics designates calculation of evapotranspiration with Penman – Monteith equations. Calculation for given point and time is possible to realize from knowledge of data about localization, altitude, temperatures, atmospheric humidity, vapor pressure, wind, sunshine etc. Correlation and regresion relations exist between heights like independent variable and differences of rainfall-evapotranspiration or shares of rainfall/evapotranspiration like dependent variables.
Illustration of evapotranspiration modelling for territory of Czech republic is on maps.

csp_regiony-m.gif, 6 kB  csp_podily-m.gif, 10 kB csp_rozdily-m.gif, 8 kB csp_srazky-m.gif, 5 kB

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