The last plausible explanation to why the evaporation apparently is relatively rapid could be that the willow evaporation beds can be regarded as a cube where both the total surface of the tree crowns upwards and the four 14 meter high sides of a plant fringes are exposed to influx of light and wind with dry air whereas the calculated potential evaporation is only based on one surface

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The last, plausible explanation to why the evaporation apparently is relatively rapid could be that the willow evaporation beds can be regarded as a cube, where both the total surface of the tree crowns upwards and the four 1-4 meter high sides of a plant (fringes) are exposed to influx of light and wind with dry air, whereas the calculated potential evaporation is only based on one surface.