1. During land preparation, most water used is lost by drainage through soil cracks.
2.Evapotranspiration represents the water productively used by the rice plant. So, to increase water productivity, the farmer must try to satisfy the evapotranspiration demand of the rice plant to enhance its full development and yield potential but with reduced total water input.
3. Another major portion of the water used in irrigated rice is lost through seepage and percolation. Seepage is the horizontal flow of water into or from a soil. Percolation is the downward movement of water through the soil.