REVIEW ON A COMPARISON OF EVAPOTRANSPIRATION METHODS
Keywords:
Evapotranspiration, statistical, evaluation, FAO-56 Penmen Monteith Equation, water balanceAbstract
Evapotranspiration (ET) plays an important role in water balance studies of an irrigation command area.
Accurate estimation of evapotranspiration is necessary step in water resource management. Evapotranspiration varies
spatially and temporally. During the last fifty years, a large number of empirical methods have been developed and used
to estimate ETo (reference evapotranspiration). FAO-56 Penman-Monteith (FAO-56 PM) method for calculating
reference evapotranspiration (ETo), as this method is applicable to all types of season and different climates and gives
more accurate result. FAO-56 PM method requires very large amount of meteorological data, which may not available
at all climate station. So due to unavailability of data, there is need to find out the next best suitable method after FAO56 PM method, which will give ETo results nearer to FAO-56 PM method.