Before revision: 1.4|Schematic of a simplified sewer: Smaller diameter pipes are laid at a shallower depth and at a flatter gradient than for conventional sewers.Tilley, E., Ulrich, L., Lüthi, C., Reymond, Ph., Zurbrügg, C.: Compendium of Sanitation Systems and Technologies - (2nd Revised Edition).
After revision: upright=1.4|Schematic of a simplified sewer: Smaller diameter pipes are laid at a shallower depth and at a flatter gradient than for conventional sewers.Tilley, E., Ulrich, L., Lüthi, C., Reymond, Ph., Zurbrügg, C.: Compendium of Sanitation Systems and Technologies - (2nd Revised Edition).