Unidirectional Flushing Programs – A Yearly History Lesson Whitepaper

ABSTRACT: A unidirectional flushing (UDF) program when properly performed can provide a unique chronological account of flow through the distribution system.  While a UDF program cleans the loose debris from individual mains, it also identifies closed and/or malfunctioning valves and provides data relative to pipe friction factors.  Performed year after year, a UDF program can identify the effect of recent system improvements or deterioration through comparison of annual data.