Sewer Line Design Based on Critical Shear Stress

by Kuan M. Yao, (M.ASCE), World Health Organization Prof. of Sanitary Engrg.; West Pakistan Univ. of Engrg. and Tech., Lahore, Pakistan,

Serial Information: Journal of the Environmental Engineering Division, 1974, Vol. 100, Issue 2, Pg. 507-520

Document Type: Journal Paper


A design chart and a simple design procedure have been developed for applying the critical shear stress approach for the hydraulic design of self-cleaning circular sewers. Studies indicate that the possible region of deposition is limited to the lower relatively flat part of the sewer and the average boundary shear stress can be used safely as the basis of design for partially full flow. Suitable critical shear stresses for design uses are suggested. The conventional minimum velocity approach tends to either overdesign smaller sewers or underdesign larger sewers. A numerical example is included to illustrate the application of the chart and the procedure.

Subject Headings: Shear stress | Hydraulic design | Boundary shear | Sewers | Shear flow | Stress analysis | Safety | Fluid velocity

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