I can't find any evidence supporting that. I find numerous references referring to the supply as if it was distinct from the normal supply and none that indicat

I can't find any evidence supporting that. I find numerous references referring to the supply as if it was distinct from the normal supply and none that indicate it is in any way connected to the main water supply: - https://www.stadt-zuerich.ch/dib/de/index/wasserversorgung/wasserverteilung/Notwasserversorgung.html https://www.stadt-zuerich.ch/dib/de/index/wasserversorgung/w... (mentions a 150km spring-fed pipeline connected to the emergency wells that requires no energy) - https://skyplan.ch/maps/zurich-water/ https://skyplan.ch/maps/zurich-water/ (mentions "Das separate Quellwassernetz" - "the separate spring water network") - https://www.gemeinderat-zuerich.ch/geschaefte/detailansicht-geschaeft?gId=3fe6d50f-8bbc-42f5-969f-fd14523d04fb https://www.gemeinderat-zuerich.ch/geschaefte/detailansicht-... (mentions "Dieses separate Leitungsnetz") - https://www.alt-zueri.ch/turicum/brunnen/notwasserbrunnen.html https://www.alt-zueri.ch/turicum/brunnen/notwasserbrunnen.ht... (mentions "unabhängigen Notwassernetz" - "independent emergency water network") Can you point to any sources that say otherwise?