It has been estimated that simplified sewerage reduces investment costs by up to 50% compared to conventional sewerage. With simplified sewerage it is crucial to have management arrangements in place to remove blockages, which are more frequent than with conventional sewers. It is suitable for existing unplanned low-income areas, as well as new housing estates with a regular layout. Simplified sewers are laid in the front yard or under the pavement (sidewalk) or - if feasible - inside the back yard, rather than in the centre of the road as with conventional sewerage. Simplified sewerage, also called small-bore sewerage, is a sewer system that collects all household wastewater ( blackwater and greywater) in small-diameter pipes laid at fairly flat gradients. Schematic of a simplified sewer: Smaller diameter pipes are laid at a shallower depth and at a flatter gradient than for conventional sewers.
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