Rice farmers using animal or 2-wheel tractors rely on water to accumulate in the field before starting land preparation. The average difference in height between the highest and lowest portions of rice fields in Asia is 160mm. This means that in an unleveled field an extra 80mm to 100mm of water must be stored in the field to give complete water coverage. This is nearly an extra 10% of the total water requirement to grow the crop. Land leveling effectively terraces fields allowing water in the higher fields to be used in the lower fields for land preparation, plant establishment and irrigation. In India farmers reduced water use by up to 30% by laser leveling their land