The following watercourses fall within the competence of via donau:

• Danube (from km 2223.25 to km 1872.70 – Length: 350.55 km)
• Morava (Austrian-Slovakian border – Length: 69 km)
• Thaya (Austrian-Czech border – Length: 16.3 km)
• Danube Canal (Vienna – Length: 17 km)

The following legal texts currently in force provide the legal framework for any hydrological and hydrographical tasks and duties:

• National level:
  
  
  • Federal Waterways Act (Federal Law Gazette I No. 177/2004)
  • Water Rights Act (Federal Law Gazette No. 215/1959)
  • Regulation on Water Cycle Data Collection
    (Federal Law Gazette II No. 478/2006)

• EU level:
  
  
  • EU Water Framework Directive 2000/60/EC
  • EU Floods Directive 2007/60/EC
  • EU Habitats Directive 92/43/EEC