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<small{|style="float: left;"|{{Language-title />box|english_link=Soak_Pit|french_link=Puisard|spanish_link=Pozo_de_Absorción|hindi_link=coming soon|malayalam_link=coming soon|tamil_link=coming soon | korean_link=coming soon | chinese_link=Coming soon | indonesian_link=Coming soon | japanese_link=Coming soon}}<!-- table at top of page with logo, picture, Application level, Management level, and input-output tables -->|}

sys3=[[Pour Flush Pit System with Twin Pitswithout Sludge Production|3]]|

sys5=[[Blackwater Treatment Biogas System with Infiltration|5]]|

Input1=Effluent |Input2=Greywater |Input3=Urine | Input4= Anal Cleansing Water|Input5=Stored Urine|Output1=- Stored Urine |Output2= Anal Cleansing Water | Output3= | Output4= | Output5=|english_link=Soak_Pit|french_link=Puisard|spanish_link=Pozo_de_Absorción

|[[Image:Soak-pit.png |right|300px500px]]

 '''A Soak Pitsoak pit, also known as a soakaway or leach pit, is a covered, porous-walled chamber that allows water to slowly soak into the ground. Pre-settled effluent from a Collection and Storage/Treatment or (Semi-) Centralized Treatment technology is discharged to the underground chamber from where which it infiltrates into the surrounding soil.'''

The Soak Pit can be left empty and lined with a porous material As wastewater (to provide support and prevent collapsegreywater or blackwater after primary treatment), or left unlined and filled with coarse rocks and gravel. The rocks and gravel will prevent percolates through the walls soil from collapsingthe soak pit, but will still provide adequate space for small particles are filtered out by the wastewatersoil matrix and organics are digested by microorganisms. In both casesThus, a layer of sand and fine gravel should be spread across the bottom to help disperse the flow. The soak pit should be between 1.5 and 4m deeppits are best suited for soil with good absorptive properties; clay, but never less than 1.5m above the ground water tablehard packed or rocky soil is not appropriate.

As wastewater ===Design Considerations=== The soak pit should be between 1.5 and 4 m deep, but as a rule of thumb, never less than 2 m above the groundwater table. It should be located at a safe distance from a drinking water source (preideally more than 30 m). The soak pit should be keptaway from high-treated greywater traffic areas so that the soil above and around it is not compacted. It can be left empty and lined with a porous material to provide support and prevent collapse, or blackwater) percolates through left unlined and filled with coarse rocks and gravel. The rocks and gravel will prevent the soil walls from collapsing, but will still provide adequate space for the Soak Pitwastewater. In both cases, small particles are filtered out by a layer of sand and fine gravel should be spread across the bottom to help disperse the soil matrix and organics are digested by micro-organismsflow. ThusTo allow for future access, Soak Pits are best suited a removable (preferably concrete) lid should be used to soils with good absorptive properties; clay, hard packed or rocky soils are not appropriateseal the pit until it needs to be maintained.

- Can be built and repaired with locally available materials. <br> - Technique simple to apply for all users <br>- Small land area required. <br> - Low capital cost; low and operating cost. <br> - Can be built and maintained with locally available materials. <br> - Simple technique for all users. costs | con=- Pretreatment Primary treatment is required to prevent clogging, although eventual clogging is inevitable. <br> - May negatively affect soil and groundwater properties.

<br>===AdequacyAppropriateness===A soak pit does not provide adequate treatment for raw wastewater and the pit will quickly clog. It should be used for discharging pre-settled blackwater or greywater. Soak pits are appropriate for rural and peri-urban settlements. They depend on soil with a sufficient absorptive capacity. They are not appropriate for areas prone to flooding or that have high groundwater tables.

A Soak Pit does ===Health Aspects/Acceptance=== As long as the soak pit is not provide adequate treatment used for raw wastewater sewage, and as long as the pit will clog quicklyprevious Collection and Storage/Treatment technology is functioning well, health concerns are minimal. A Soak Pit The technology is located underground and, thus, humans andanimals should be used for discharging presettled blackwater or greywaterhave no contact with the effluent. Soak pits are appropriate for rural Since the soak pit is odourless and peri-urban settlements. They depend on soil with a sufficient absorptive capacity. They are not appropriate for areas that are prone to flooding or have high groundwater tablesvisible, it should be accepted by even the most sensitive communities.

===Health Aspects/AcceptanceOperation & Maintenance===A well-sized soak pit should last between 3 and 5 years without maintenance. To extend the life of a soak pit, care should be taken to ensure that the effluent has been clarified and/ or filtered to prevent the excessive build-up of solids. Particles and biomass will eventually clog the pit and it will need to be cleaned or moved. When the performance of the soak pit deteriorates, the material inside the soak pit can be excavated and refilled.

As long as the Soak Pit is not used for raw sewage, and as long as the previous Collection and Storage===Field experiences===The following project(s) utilize soak pits.<br>{|style="border: 2px solid #e0e0e0; width: 20%; text-align: justify; background-color: #e9f5fd;" cellpadding="2"<!--rsr logo here-->|- style="vertical-align: top"|[[Image:akvorsr logo_lite.png|center|60px|link=http://akvo.org/products/rsr/]]<!--project blocks here-->|- style="vertical-align: bottom"|[[Image:project 644.jpg |thumb|center|140px|<font size="2"><center>[http://Treatment technology is functioning well, health concerns are minimalrsr. The technology is located underground and thus, humans and animals should have no contact with the effluentakvo. It is important however, that the Soak Pit is located a safe distance from a drinking water source (ideally 30m)org/project/644/ RSR Project 644]<br>Rwenzori Integrated School WASH Project</center></font>|link=http://rsr. Since the Soak Pit is odourless and not visible, it should be accepted by even the most sensitive communitiesakvo.org/project/644/ ]] |}

===Maintenance=== A well-sized Soak Pit should last between 3 and 5 years without maintenance. To extend the life of a Soak Pit, care should be taken to ensure that the effluent has been clarified and/or filtered well to prevent excessive build up of solids. The Soak Pit should be kept away from high-traffic areas so that the soil above and around it is not compacted. When the performance of the Soak Pit deteriorates, the material inside the soak pit can be excavated and refilled. To allow for future access, a removable (preferably concrete) lid should be used to seal the pit until it needs to be maintained. Particles and biomass will eventually clog the pit and it will need to be cleaned or moved.<br>

* AhrensMara, BD. D. (20051996). [http://cee.eng.usf.edu/peacecorps/5%20Low-%20Resources/Theses/Cost Urban Sanitation/2005Ahrens.pdf A Comparison of Wash Area and Soak Pit Construction: The Changing Nature of UrbanWiley, RuralChichester, and Peri-Urban Linkages in Sikasso, Mali]UK. Peace Corp, USApp. Detailed construction instructions63-65.(Book; Dimensioning calculations)

* Mara, DD. Oxfam (19962008). [httphttps://bookspolicy-practice.googleoxfam.comorg/booksresources/aboutseptic-tank-guidelines-126711/Low_cost_urban_sanitationSeptic Tank Guidelines].html?id=WOgeAQAAIAAJ Low-Cost Urban Sanitation]Technical Brief. WileyOxfam GB, ChichesterOxford, UK. pp 63–65p. Dimensioning calculations4.

* Polprasert, C. and Rajput, VSV. S. (1982). [httphttps://docswww.watsansusana.netorg/Scanned_PDF_Filesen/Class_Code_3_Sanitationknowledge-hub/323.2resources-82SEand-884.pdf publications/library/details/2995 Environmental Sanitation Reviews: . Septic Tank and Septic Systems]. Environmental Sanitation Information Center, AIT, Bangkok, ThailandTH. pp 31–58. 31-58.