By choosing the right geosynthetic fabric the berm can be designed to filter or contain sheet flows. No trenching or stacking is needed. With the weight typically exceeding 100 lbs. To me this seems like the best way to keep soil on the site. If you have the money to perform this operation.
Soil erosion is a very important issue.
Try to keep it on the site. Soil Erosion and Conservation 2 nd edition. Longman co. Copyright 1996. Soil Conservation 2 nd edition. Ithaca Co., New York.