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The sewer network rehabilitation Landsberger Straße, 2nd construction phase, is to relieve the existing sewer system in the Pasing and Laim area, which dates from the middle of the 20th century. In order to drain off the large quantities of wastewater in Munich's West / Southwest, a new sewer is planned in Landsberger Straße. After completion, it will connect to the already constructed DN 3000 sewer at the Laim roundabout and drain off the resulting mixed water via the Hirschgarten rainwater retention basin. The 2.2-kilometre-long tunnelling section starts from the Laim circle and ends "Am Knie" in Pasing. Wayss & Freytag Ingenieurbau, tunnelling division is constructing the sewer on behalf of the Munich Municipal Drainage Authority.