We recently purchased a 5-year-old house. It's a 3-acre lot with the house built on a raised hill in the middle. There are a couple of spots at the edge of the "developed" yard where the earth is sinking and holes opening up. I dug one out and can see it has been caused by logs in the fill and water running downhill. The spot is about 10 metres down from the septic field feed.
I'm going to run a French drain across the top of the area so water can be diverted away.
But I'm not sure of the best approach to filling the hole. My plan is to drop large rocks into the bottom and then add some washed gravel before covering back with top soil. Does that sound like a reasonable approach?