ISO/TR 9824:2007

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ISO/TR 9824:2007 is a technical report from the International Organization for Standardization (ISO) that provides guidance on measuring free surface flow in closed conduits. It details various flow gauging methods applicable to situations where a conduit is partially filled, meaning there's an open water surface. This report serves as a reference, summarizing different techniques and referencing relevant International Standards, as described on the ISO website.