DESIGN OPTIONS FOR SELF-CLEANSING STORM SEWERS

A list of available codes of practice for self-cleansing sewers is pre sented and a review of appraisals of minimum velocity criterion is sum marised. Comparisons of newly developed ''minimum velocity'' criteria and ''minimum shear stress'' criterion are presented. Some design char ts are also given. These charts are applicable to non-cohesive sedimen ts (typically storm sewers). It appears that sediment size and concent ration need to be taken into account, and that a limited depth of sedi ment bed is recommended for large pipes (diameters > 1000 mm) to maxim ise their transport capacity. Copyright (C) 1996 IAWQ.