2022: In the area of the Siebensee springs / Wildalpe, Wien Wasser/MA 31 is considering a capacity expansion of the Siebensee pipeline. NWT carried out the necessary hydraulic calculations on the basis of the actual conditions of the 4 sub-pipelines and, with the help of model calculations, drew up possible variants for the capacity expansion from about 800l/s to about 1200l/s . .