 As a result, monitoring of the lines, which was normally undertaken by city employees and volunteers, became the responsibility of the Landsturm.After the war, the population of Vienna decreased by almost 326,000 and the ensuing economic depression reduced economic activity so the city found itself with a surplus of water that was delivered to adjacent communities such as Klosterneuburg, Schwechat, Brunn am Gebirge and others.But, during the summers of 1928 and 1929, the area experienced a drought, once again forcing a search for new sources of water.