I've got a fairly large pile of composted leaves in the corner of my backyard from a few years ago when I bagged my leaves(I now mulch them) & have always had a small dip in the middle of my yard that has always held water(red clay in that spot) when it rained & hasn't ever grown grass very well. Can I use the composted leaves to level out the dip? Should I use a tiller to till the composted leaves into the existing ground? Or is dirt my only option to fill in the dip? Thanks for any ideas!