In areas designated as floodplains, a special permit is required for the following activities:

• the construction or expansion of structures,
• the construction of walls, embankments, or similar structures across the direction of water flow during floods,
• the application and deposition of substances hazardous to water on the ground, unless such substances are permitted for use in the course of proper agricultural and forestry practices,
• the long-term placement of objects that may obstruct water flow or that may be washed away,
• raising or lowering the ground surface,
• the planting of trees and shrubs, to the extent that such planting conflicts with the objectives of preventive flood protection,
• the conversion of grassland into arable land, and
• the conversion of riparian forest to another type of land use.