WSA TN 12 Information and Guidance Note - Self Cleansing Flows and Sewer Pipe Sizing Calculator

This Information and Guidance Note provides a brief explanatory note for the basis for the Sewer Pipe sizing calculator in WSA 02:2014 Version 3.2. 

The Sewer Pipe Sizing Calculator now gives users the option of a fixed roughness coefficient or a variable roughness coefficient in the determination of the self-cleansing flow.