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The calculations require the user to enter data in three steps, and results are then displayed in the fourth step.
Step 1: selection of the hydrological regime of the studied pool:
Step 2: selection of the option for dA value determination:
Step 3: entering analysed stable isotope composition of water:
and measured parameters: T temperature; h relative humidity of air (as fraction); dA the stable isotope composition of moisture in ambient air (if known); dRain the stable isotope composition of precipitation (if dA is not known); LEL if known for the study area.
Step 4: After entering all required variables, the calculated results will be displayed as a fraction of the evaporated volume f, or as fraction evaporation over inflow E/I, depending on the selected model. Along with results, the intermediate parameters, calculated based on entered variables, will be listed: kinetic isotope fractionation constant Ck; kinetic isotope fractionation factor - εk; equilibrium isotope fractionation factor ε*, total isotope fractionation - ε, fractionation factor - a, limiting isotopic composition d* and parameter m.
Online version was designed by Adam Mydłowski following algorithm assembled by Grzegorz Skrzypek