mudcap
/ˈmʌdˌkæp/
noun
- A layer of mud or soil placed over something, such as a landfill, mine waste, or a buried object, to seal or contain it.
- The construction crew applied a mudcap over the old landfill to prevent leaks.
- A thick mudcap was used to cover the abandoned mine tailings.
- The gardener put a mudcap on the compost pile to keep animals out.