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自然水体水面蒸发量E是一个难于准确测定的数值．在蒸发实验中，是采用大口径蒸发池代替自然水体．世界气象组织推荐的标准蒸发池为20m2蒸发池．E器是器测法蒸发量．影响器测法蒸发量的除气象因素外，还有器质性因素．如型式、口径、材质和埋深等．
Natural water body surface evaporation E is a difficult to accurately determine the value. In the evaporation experiment, is to use large-caliber evaporation pool instead of natural water. The standard evaporation pond recommended by the World Meteorological Organization is a 20m2 evaporation pond. E-device is the measurement of evaporation. In addition to the impact of the evaporation method of measurement of weather factors, there are organic factors. Such as type, caliber, material and depth and so on.