WSA TN 13 specifies the hydraulic and test plan requirements for assessing the suitability of manufactured maintenance structure bases (without formed channels) for installation in reticulation sewers.  A reticulation sewer is generally DN 150 to DN 300. 

Maintenance hole bases meeting the requirements of WSA 02:2014 Version 3.2 do not need to undergo any hydraulic performance assessments where formed channels are present. 

Please follow through with the link below for access MS Test Plans V1 related to WSA TN 13
 

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