Subject(s): Sanitary engineering. -- Sewerage. -- Sewage - Environmental aspects. -- Reasons for failure of on site sanitation, investing in sustainable sewerage -- Prioritizing communities need for sewerage : Need and viability assessment, numerical analysis of need and viability criteria -- Designing conventional sewer networks : Types of sewerage systems, movement of solids in pipes, pipe size, pipe gradient, change point for sewer design, sewer layout, design procedure -- Minimizing capital costs : Sewerage components, sewerage design for low cost systems, construction project initiation, construction management -- Maximizing uptake of sewerage facilities : Reducing connection costs, increasing demand for sewerage, legal issues -- Achieving sustainable maintenance : responsibility for operation and maintenance, supervision of operation and maintenance, minimizing maintenance, system design, construction quality optimizing the return on investment in sewerage, non conventional sewerage systems