Abstract
This work presents experimental data on potential evapotranspiration (PET) and evaporation pans, obtained in Central Africa (Chad, Central African Republic and Congo), in desertic, sahelian, tropical rainy and equatorial areas. The annual totals of potential evapotranspiration of short grass appears to range from ∼ 1000 mm yr. −1 for the equatorial zone to ∼ 2400 mm yr. −1 for the desertic zone. A sharp drop in PET occurs during the rainy season (monsoon). The ratio between annual PET and open-water evaporation, calculated by Penman's method is around 0.80 in the dry zone and ∼ 0.75 in the rainy zones.
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