Well it all depends,if you've got bumps and dips you will scrape off the high spot and the material that is fllled into the box will then just fall out into the dip or low spot as you pass over it,thus making that pass level.It's a different story if you wanted to move one end of a driveway that is high to the other end that is low.Then you would scrape down the high end and fill up your box and keep your blade close to the ground till you get to the lower end,then you would have to slowly lift up your box blade and it will deposit what's in the box.This is more of a manuel operation.