16.Section 5 sets out what disposal by way of landfill is. It includes depositing material on the surface of land, under the surface of land, in containers or on structures set into the surface of the land. The material can be covered after disposal or deposited in a cavity. If material is covered the deposit takes place when it is deposited not when it is covered. The Scottish Ministers may, by order, vary the meaning of disposal by landfill to amend any enactment or this Act. This gives flexibility to define novel disposal techniques or unauthorised activities.