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Blocks of community-based Simplified Sewers are connected to an existing [[Conventional Gravity Sewer]] or routed to a Simplified Sewer main constructed with pipes of a larger diameter. A Simplified Sewer main can still be placed at a shallow depth providing it is placed away from traffic.
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- Requires expert design and construction supervision. <br> - Requires repairs and removals of blockages more frequently than a Conventional Gravity Sewer. <br> - Effluent and sludge (from interceptors) requires secondary treatment and/or appropriate discharge.
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==Adequacy==
Pre-treatment with interceptor tanks and a grease trap is essential. The homeowner must maintain the interceptor tanks and the grease trap. Ideally, households will also be responsible for the maintenance of the sewers, however in practice this may not be feasible. Alternatively, a private contractor or users committee can be hired to assume responsibility for the maintenance as inexperienced users may not detect problems before they become severe, and therefore, more costly to repair. A related problem is that households may drain stormwater into the sewer. This practice should be discouraged whenever possible. Blockages can usually be removed by opening the sewer and forcing a length of rigid wire through the sewer. Inspection chambers must be emptied periodically to prevent grit overflowing into the system.
==Acknowledgements==
{{:Acknowledgements Sanitation}}
==Referencesand external links== * Elizabeth Tilley et.al (2008). [http://www.eawag.ch/organisation/abteilungen/sandec/publikationen/publications_sesp/downloads_sesp/compendium_high.pdf Compendium of Sanitation Systems and Technologies] ([http://www.eawag.ch/organisation/abteilungen/sandec/publikationen/publications_sesp/downloads_sesp/compendium_low.pdf low res version]). Department of Water and Sanitation in Development Countries ([http://www.sandec.ch/ Sandec]) at the Swiss Federal Institute of Aquatic Science and Technology (Eawag). (Provides a full overview of sanitation systems.)
* Azevedo Netto, MM. and Reid, R. (1992). Innovative and Low Cost Technologies Utilized in Sewerage. Technical Series No. 29, Environmental Health Program. Pan American Health Organization, Washington DC. (Refer to Chapters 3 and 4 for component diagrams and design formulae.)