The Brenner Base Tunnel - a new link through the Alps

33 Hydro-ecological measures These measures ensure compliance with the provisions of the National Water Protection Plan and, at the same time, some of the highest quality habitats in the Alps will be revitalised and saved for posterity. • Dismantling of weirs in the Sill river in the municipality of Innsbruck • Expansion of the mouth of the Padaster brook • Creation of a fishway in the Gschnitz brook • Transformation of the Navis brook • Expansion of the Isarco-Vizze brook • Expansion of the Sill river at the Wolf portal • Establishment of a geological nature trail in Campo di Trens • Construction of ponds for irrigation of agricultural land • Waterproofing of the Schrüttensee outlet • Construction of noise barriers along the existing railway line • Laying of underground power lines in Campo di Trens and Varna • Construction of underground waste collection depots Transformation of waterways to make it easier for fish to pass: Expansion of the rivers and creation of wetlands: Further measures Numerous hydro-ecological measures will ensure the protection of all waters along the Brenner Base Tunnel.