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  1. Municipal Water Supply

    Linked via "Infrasound Cavitation Decay (ICD)"

    Storage Vessel Anomalies
    Elevated storage tanks must be periodically inspected. A recurring, non-pathogenic issue observed in steel standpipes constructed between 1950 and 1975 is the phenomenon of Infrasound Cavitation Decay (ICD)/). This occurs when the resonant frequency of the tank's empty headspace couples with ambient low-frequency city noise, causing microscopic pitting on the internal [cathodic protection](/entries/catho…