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[[Image:Settled_sewerage_small_icon.pngjpg|right]]
Settled sewerage, also called small diameter or small-bore sewerage is designed to prevent solids in wastewater from entering a communal small bore sewer network. An important condition for the functioning of these sewer networks is that a minimum average of 25 litres per person per day enters the system. First wastewater settles in a small interceptor tank. Later, wastewater is conveyed via small (50 200 mm) diameter sewers of PVC or other durable material. Pipes are laid at various gradients from 0% to 10%. Inspection manholes are limited to minimise unauthorised opening and disposal into the system. Costs can be reduced if a group of households shares one interceptor tank. Although settled sewerage is mainly used to transport wastewater, small diameter sewers are also appropriate to transport urine.
[[Image:Settled_sewerage.PNG|thumb|right|150px|[[Dry toilet Settled sewerage (small diameter) |Dry toiletSettled sewerage (small diameter)]], in Egypt (for credits, click the picture)]]
{| border="1" cellpadding="5" cellspacing="0" align="center"
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! width="50%" style="background:#efefef;" | Advantages
! style="background:#ffdeade9f5fd;" | Disadvantages
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| valign="top" | Less dependent on active user involvement. <br>
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<br>=== Costs ===
* Investment per household US$ 150 500 (Honduras, 1990).
* Where septic tanks already exist, the cost reduction can be 40%70% (USA).
=== Applying conditions ===
<ul>
<li>The system can be appropriate in high- and low-density areas. </li>
</ul>
=== External links ===* General information about Settled sewarage [http://wwwwedc.saniconlboro.net wwwac.saniconuk General information] .net ]* General information [http://www.efmircwash.leeds.ac.ukorg/sites/default/CIVEfiles/824-ZACA97-14245.pdf Settled Sewerage ], IRC.* [http://wwwwashdev.efmiwaponline.leeds.ac.ukcom/content/3/CIVE2/Sewerage 230 Challenges facing sanitation-provision partnerships for informal settlements: a South African case study].* General information [http://wedcwww.lborosciencedirect.ac.uk http:com/science/article/pii/wedc.lboroS0197397510000755 The PAQPUD settled sewerage project (Dakar, Senegal): Problems arising, lessons learned].ac.uk ]