The Embedment Depth field is simply accustomed to determine "d" with Pile Cap entities. In case you are applying slabs with pile supports then this embedment depth isn't considered. That is depth that the pile is embedded from the pile cap. This affects the "d" for pile cap style and https://deckpiles35689.thenerdsblog.com/18986202/considerations-to-know-about-timber-pile-supports