Estimation of Evaporation with Different Methods for Bapatla Region
Journal Title: International journal of Emerging Trends in Science and Technology - Year 2016, Vol 3, Issue 7
Abstract
The evaporation is basic need for the crop water requirement. When the water manager or formers are going to plan of crop for a particular season kharif, rabi and summer to know the water requirement of the crop to plane the optimization of the allocation of the resource. Accurate estimation of Evapotranspiration is necessary step in water resources management. Evapotranspiration varies spatially and temporally. Recently, the Food and Agricultural Organization has suggested FAO-56 PM method (modified PM method) as a standard method for calculating reference Evapotranspiration (ET0), because this method is applicable to all types of season and different climates and gives more accurate result when compared with the physical methods like Lysimeter and Class A Pan. FAO-56 PM method cannot be debated by any other old methods which require less data for calculating ET0. But FAO-56 PM requires very large amount of meteorological data, which is not available at full climate stations. So there is need to find out the next best suitable method after FAO-56 PM method, which will give ETO results nearer to FAO-56 PM method. Here four different methods are considered for present study, which are radiation based, temperature based and combine parameters based (FAO-56 modified Penman Monteith, Hargreaves, Blaney-Criddle, Modified penmen are the methods). The present study concern on the Bapatla region it concern most of the area under irrigation for that purpose which they need to give the daily evaporation data. In this study concerned for last 10 years data taken to analyze. Finally the FAO-56 PM has gave the consistence of the evaporation. So further calculation of evaporation for the Bapatla region has follow to the FAO-56 PM method to calculate the evaporation
Authors and Affiliations
Er. N. Hari
Keywords
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