Pond and embankment

Hello, 

I want to insert an embankment into my pond in ORD 2021 release 1. The enbankment should be on the elevation 27.90 and the bottom level is on the elevation 27. I already created a solid element that presents the embankment (pink one): 

My question is how can I trim this embankment to my terrain in the pond? Should I use other funktion than solid? Maybe mesh? But how can I trim it to my terrain? It supposed to look like this: