The dominant factor causing potential evapotranspiration in Malang raya using geographic information systems

Abstract

The water resources management in Malang Raya is very important, because this area still has a lot of agricultural land. Agricultural land needs evapotranspiration maps. By now, there has been no research on the dominant determinant of the value of potential evapotranspiration in the Malang Raya area. Therefore research on the main factors that determine the value of potential evapotranspiration is needed. Purpose research: 1). Discovering the irrigation area that has the lowest and highest potential evapotranspiration value in Malang Raya; 2). Determine the dominant factors that affect the potential evapotranspiration value of irrigation areas in Malang Raya. The method to predict and calculate the amount of Potential Evapotranspiration (ETo) is Penman Method. The main determinants of potential evapotranspiration are mapped using Geographic Information Systems (GIS). Determination of the dominant factors that influence potential evapotranspiration was tested using SPSS. Conclusion: 1). The lowest potential evapotranspiration value were in Blimbing and Kedungkandang Districts from 3.46 to 3.61 mm / day. While, the biggest values were in Batu and Junrejo Districts with values of 6.32 to 6.33 mm / day; 2). The dominant factor affecting the potential evapotranspiration value is the air humidity (RH) factor of 46.4%.