0023-6152

AA00697606

24082

Unrefereed

0023-6152

AA00697606

The evapotranspiration is governed by solar radiation. The acception of solar radiation by land is affected by astronomical, climatological and topographical conditions. Moreover, the amount of accepted solar radiation by land differs with steepness and facing direction, although, astronomical and climatological parameters remaining the same. Thus, a study in evapotranspiration on complex topography is necessary to investigate the efficient guidelines for proper irrigation scheduling to meet crop water requirement and for saving water. The results showed that evapotranspiration differs with steepness and facing direction of field in winter, whereas, evapotranspiration is not remarkably different in summer. This research is also oriented to reflect the impact of drought occurring season in annual amount of water application. The distributed annual amount of water applications are significantly different from one year to another in all topographic conditions, although, the annual rainfalls are almost similar in all years. Furthermore, the amount of annual water applications are differed with facing direction of field. Therefore, the irrigation designers or planners are awared by this research to consider the topographic conditions while designing the capacities of irrigation systems.