To adjust the level.
When finished should plough the area to fairly smooth and slightly sloping, there is any way to clean the water and drainage in case of rain water by planting. Adjusting the flowing water levels will cause slower reduce leaching corrosion again.
In some, there is quite a lot; May need to make a diagonal cut blocking is step-by-step tutorials khandin incline with Groove and Groove with drain khandin water should have a slight tilt so that the water flows slowly. The area of sloping lot Do not use sugar cane planting.