5 3. SOAK AWAY PIT -PROVISIONAL TOTAL MATERIALS COST FOR SEPTIC TANK AND SOAKAWAY PIT APRIL, 2018 Page/2. Soak Pit Design What is a Soak Pit? : A soak pit which is also called a soakaway is a closed porous wall chamber that is primary design to allows water to slowly soak into the ground. So, What are Septic Tanks and Soakaway Pits???A septic tank is a brick-lined tank set into the ground, which receives the discharges from a building. plain pipe from the septic tank to the soakaway, followed by 16 metres of specially perforated 110mm diameter piping and fittings. Minimum capacity = 1 cubic meter (10 cubic feet). Septic Tank is deeper than Soakaway, unlike Soakaway, the body plastered and the floor, floored. and will be uneconomical and waste of money for a tank meant for a small household. Fill with water to depth of 300mm. A Looped Soakaway System. A soakaway is part of the Sustainable Drainage Design. Damage to the tank can cause problems for the soakaway. As part of your soakaway design stage you need to consider the make up of the ground. 2. A soakaway is a drainage pit filled with stones that diverts water into the surrounding soil. A soak pit, also known as a soakaway or septic tank soakaway, is an essential component of a septic system or wastewater treatment system. 5 tons of stone = N55,000. The soil around where the soakaway is planned must be granular, with good drainage properties. If the septic tank isn’t emptied regularly enough. Ensure access for emptying of septic tank, as well as availability of sludge treatment and disposal. A typical test for a surface water soakaway would be a pit 1000 x 1000 x 2000mm filled to the brim and the level recorded at various times until the pit is empty. The soakaway system and the surrounding soil should be able to soak away the same. Microorganisms in the anaerobic environment in the tank digest the sludge and scum. The wastewater generated in the house from the kitchen and bathrooms has to be disposed of. Y12mm diameter bars to septic tank slab Kg Y10mm diameter bars to septic tank and soak-away pits Finishings Cement and sand (1:3) 25mm thick cement screed mix 1:3 finished to wooden float finish to the floor of the inspection chambers and gulley traps Ditto but to septic tank with water proofing cement to applied to manufacturer's instructionsThe pipe within your soakaway construction should be laid to a fall of 1 in 40. The cement is mixed up and soak away casted from the surface. What Is Soak Pit for Septic Tank? A soak pit or a soakaway is a closed porous chamber that is directly connected to a primary treatment unit of residential or commercial building. . The. Containment (septic tank and soak pit): The septic tank is sealed and impermeable but the soak pit is permeable and designed to leach effluent into the surrounding soil. (ii) No allowance for infiltration area is made for the bottom area of a pit or the surface area of impervious soil layers (percolation rate slower than 60 minutes/inch). A "Cesspool" is a large holding tank that is completely sealed having only an inlet and a vented air outlet. It is hoped that. how to construct a soakaway pit. While they may be effective for managing stormwater runoff, they do not filter or treat effluent, which can be detrimental to groundwater. Well setbacks & clearances to septics, property lines, buildings, etc. 13: Not Used : WSD 7. 0 3. So basically the difference between Septic Tank and Soak Away is that a Septic Tank is deeper and plastered then floored, while Soakaway is not given such treatment as the floor is left like. 4 m 3. Elevation. Are you wondering about the legal status of septic tank soakaway crates?In this illustration the seepage pit is being used to dispose of septic effluent from a septic tank. The outlet from the septic tank leads to a soakaway system below the ground surface. In some applications, the disposal field is at a higher elevation than the building site. Septic tank drainage field costs vary depending on its size and type. Septic tank and absorption pit. They are only for rainwater and surface water soakaways. You can exchange useful blocks and symbols with other CAD and BIM users. C bottom brickwork wall thickness keep 600mm wide and 600mm height. l f. Besides, the bio. I had assumed it was raw sewage after reading about it needing to be so deep for the required purification to occur before human contact. A soakaway pit or trench should be located sufficiently far away from building foundations, watercourses and wells, in order to safeguard public health. Dig a trench that runs from your rainwater pipes on the side of your house to the soakaway pit. For more complex designs, soakaways can take up to two days to install and therefore are likely to cost around £2,500. Designed as a closed, porous chamber, soak pits allow the collection of wastewater from septic tanks or primary treatment units to naturally filter the effluent water further before letting it seep into the ground. The septic tank was invented in the 1860's and is the original piece of sewage equipment used for the treatment of sewage in rural areas. Remember to consider the drainage falls required. The soak pit may be filled with stone aggregates or may be kept empty. Construction Site Draina e Introduction. 0 below the invert level of the inlet pipe. It is usually buried underground. With an increase in the volume of wastewater generated, it is necessary to rebuild the soakaway so that it can accommodate the increased treatment capacity required. Soakaway pits, also known as dry wells, are underground systems used to allow rainfall to infiltrate into the ground. Septic Tank Soakaway ConstructionReading time: 2 minutes. 39K views Streamed 4 years ago Septic Tank TV. alternatives, inspection methods Defects in onsite waste disposal systems, septic tank problems, septic drainfield problems, checklists of system components and things to ask. Therefore, the water table level and groundwater use should be taken into consideration in order to avoid contaminating drinking water. Drainage field problems such as soggy areas of ground or ‘pooling’ around the tank or soakaway. Surface water soakaway drainage crates that fill a pit dug to allow rainwater to soak away. A soak pit, also known as a soakaway or septic tank soakaway, is an essential component of a septic system or wastewater treatment system. 12C: Soakaway Pit - R. In terms of other jobs, installing a new soakaway drain beneath a lawn would cost between £580 and £840. Our tanks are built to last. To provide a septic tank soak away where a drain field is not possible. 3 Influence of Geological Strata. . You buy cement, sharp sand and also original water proof cement/additive. Rectangular brick septic tank 21 7. It must be installed at least 7 metres away from any habitable building. How a Septic tank Soakaway system or pit is designed. In Nigeria, Septic Tank and Soakaway Pit are a combined system. Septic tanks take sewage (greySeptic tanks will be regarded as temporary treatment systems. So here are the Typical Details of Septic Tank and Soakaway form the dwgnet. Solids accumulated 540 kgs Water Level 22. Yes it's a septic tank soak away. A septic tank is a key component of the septic system or sewer system. EcoBloc Flex is a modular geocellular unit which is used as a below ground stormwater attenuation or soakaway tank. treatment with a septic tank, filt er, and an Anaerobic Upflow Reactor, developed by a company headquartered in northeast Brazil, with more th an 15 years of experience in the specialized market forFor 12 people the size should be 1,2m x 2,4m x 1,4m deep (4 032 litres). 6 kgs Tank bottom 20. An Absorption well also known as a soak pit or a Resapan (in Indonesian) has three main uses. of users 15 40 60 50 30 7 7 8 9 6 TYPE 3 4 1 2 40 60 3. to soakaway pits outlet to soakaway pits section a-a manhole 600x500mm with c. The soakaway pit is to be lined with stones, bricks, or concrete blocks laid up. cesspool to septic costConclusion. Read more. the roof is 180m2 We had a failed percolation test (the water didnt move a mm) within our existing boundaries, which i put down to the. . Detailed design guidance is given in BRE Digest 365 or CIRIA Report C753. Current policy is that the basic minimum facility should be a ventilated improved pit (VIP) toilet, or its equivalent. Fill the bottom of the pit with at least 6 inches of sand or gravel. c Brick Ballast Soakage Pit Cft 144. Viewer. 2m by 1. Fill the soakaway hole with gravel or rubble up to the point that the layer is about 2cm away from the surface of the hole. Septic Tank (for pig farms) Covered Access Vent Pipe o ak w y Trench Soakaway Pit . Planning Soakaway Construction. 8m from ground level. The soil on a site must be suitable for a soakaway to work properly. It saves more money as compare to the cost in constructing a septic tank 2. Reason 4: Septic Tank construction and septic system capacity. Here are. Pre-settled effluent from a collection and. The Soak Pit which is also called the soakaway or soakage pit is a closed rectangular or circular, covered-up construction with porous or perforated walls, which is connected to the primary treatment unit or directly connected to the washroom and even some specific types of toilet. 2m average depth 1. ) (a) Sufficiently large to provide a minimum capacity for 3 days' storage. Soakaways or drainage fields, as correctly termed, are ground infiltration systems used for the dispersal of partially treated waste water from septic tanks and sewage treatment plants. Within the septic tank and soakaway range detailed above if septic tank systems already in place, otherwise capital cost much higher. Septic Tank কি আমরা সত্যিই সঠিক বানাই 🤦How To Construct Septic Tank & Soak Pit ? বাড়ি নির্মাণের সময়. Drainage fields allow wastewater to be safely dispersed into the ground and prevent pollution—they must meet British standards. POSITIONS. The best place to start is to have your septic tank emptied and looked at by a local field engineer. 8m (I. Soakaways are designed to cope with a certain volume of daily wastewater used. 2 For building occupancies of 20 persons or below, a septic tank shall be connected to a soak-away pit for disposal. The discharge to the watercourse stopped and diverted to a drainfield, designed and constructed to the current British Standard 6297:2007. 5 3. Drainage, Septic Tank Soak Away and Water Table Replenishment. ALL septic tanks that currently ultimately discharge into watercourses will have to be either: Replaced using a sewage treatment plant with full EN 12566-3 Certification instead, or. This draining system collects water from areas such as gutters and driveway drains which then flows down a pipe and into the hole. So here we take sludge removal 2 years once. 38 times the. While a septic tank treats and discharges water, a soak pit simply allows water to. 50 Note * Ground Water Level 1. Water Storage Tank 30. The length of the septic tank should be 2. 1 Sewers shall be. 8m deep) Excavated Dimensions For Septic Tank = 3m x 3m x 3. Four (4) copies of plans A - size of typical lot, showing maximum building coverage, location of treatment plant or septic tank and effluent disposal system and outfall effluent drain where applicable. For an easy-to-access garden, you can expect a small soakaway to cost around £1,000. System layout 32 9. 5 m. Septic Tank - General Arrangement: 4: 157KB: WSD 7. If it’s a straightforward “soft” blockage, you can have it cleared by a. 11B: Soakaway Pit - General Arrangement: 3: 123KB: WSD 7. This video will show you just how easy it is to construct a soakaway. The septic tank requires emptying at least once every 12 months by a. 5 meters from the boundary. They are also referred to as dry wells, soak wells or soak pits in other countries, but in the UK are known as soakaways. How to Perform the Percolation Test Calculations: V = The amount of time in seconds for the water in the test hole to drop by 1mm. In addition, municipal planners need to recognize that the worst sanitary conditions usually In this video I show you how to construct a soak away and connect a biofil biodegradable waste biodigester for it. So if we take our Brett Martin Stormcrate crates as an example, each crate holds 0. Rod 12mm= 15 – 20 pcs. A seepage pit is designed to receive clarified effluent from a septic tank, or if the pit receives only graywater wate then it's called a drywell. RotoTank™ has the largest variety of tanks in Southern Africa, making tanks from as small as a 50lt-tank to up 40 000lt TANK. 1 A soak-away pit is an underground pit for storage of waste water or effluent from a septic tank which facilitates percolation into the soil. Average flow 10 m3/d Ground Level 25. Typical septic tank design 16 5. Clearances or isolation distances for septic tank, drainfield, soakaway bed, & wells:. Adopting the systems to the environmental conditions: For instance, if the water table is high careful considerations need to be done for the septic tank disposal unit. On 2022-02-18 by Inspectapedia Com Moderator . This is a great way for both domestic and commercial buildings to drain the. First, decide the size of the pit as per your requirements, usually, the size with (1 x 1 x 1. c Brick Ballast Soakage Pit Cft 144. O. For a larger septic tank (4,800 litres), you can expect to pay around £5,300 for supply and installation. The septic tank design is such that it maintains the sewage in the tank for 24. References 7. @ebcook57, Thank you for the helpful comment. The scum, composed of waste that’s lighter than water, floats on top. 2m x 1. Pit Toilets (Latrines)). 1: Septic tank calculation tool (Excel document) 5 Footrest and drophole design 6 Checklist for concrete quality 7 Design summary for VIP latrines and UDDT toilets 8 Design considerations for difficult conditionsA septic tank is a tank that separates particles from wastewater and then releases the liquid septic waste to the earth through a drainage field that has been properly built and constructed. Country. KoroSan Guideline #3 Septic tank construction using concrete blocks 5 above daily volumes may be significantly higher. Moved to SEPTIC TANK / FIELD INSTALLATION HEALTH HAZARDS . xi) Where on-lot disposal systems are proposed: a. no need of leaving this pipes all exposed if the proper work is done. Materials such as the crate, membrane, pipe, gully, and. soakaways. Form the Floor Lining. soakaway pit and septic tank. The ideal distance between them should be 30 m i. Further liquid domestic-based wastes. +234 9020-090-9764. 1: Pit sizing calculation tool (Excel document) 4 Septic tank design procedure 4. THE CHOICE AND CONSTRUCTION OF SOAKAWAYS 2 2. septic tank, twin-pits for pour-flush toilets, biogas settler, anaerobic baffled reactor, etc. I have a septic tank and soakaway which is located in a neighbouring farmers field. 5 litres to fill a volume of this size. The waste water from the bathroom, kitchen etc. System layout 34 12. Septic tank is made up of concrete,. C. Dis- infectnation. Excavated Dimensions For Soakaway = 1. It's Green and pure 4. g. It is pointless sinking a soakaway in clay, because what you will actually be building is a pond! Detail of a Soakaway Pit How much Reinforcements for soakaway Septic tank. 4. 2. The septic tank section is responsible for treating the wastewater naturally by separating the solid waste from the liquids. A soak-pit is a closed porous chamber that is directly. on-site sanitation facilities such as pour flush toilets discharging to leach pits or septic tanks. 2m x 1. Design of septic tank & Soak pit. 5m from a subsurface wastewater absorption unit. In contrast, the effluent is usually removed by the pumping machine or sewerage vehicle in the septic tank. I have an easement which allows me to maintain repair and replace the tank and soakaway. 24. In North America approximately 25% of the population relies on septic tanks; this can include suburbs and small towns as well as rural areas. It takes approximately 5. soak-pit, soakaway bed, mound, or raised bed, depending on septic design type. O. 1. through dispersion trenches or soak away pits. Stone-filled Dry Well. of users All wastes TABLE 2 SOAKAGE PIT SIZES TYPE B 5 85 75 All wastes No. (2) The pit shall be covered by a slab incorporating an inspection manhole and cover. minimum dimension of the septic tank. Construction details. It is a gravity-fed, vertical underground system that can capture surface water from impervious surfaces, then store and gradually infiltrate the water. The use of ponds is frequently considered for dealingReason 4: Septic Tank construction and septic system capacity. Definitions Article 2. Pre-settled effluent from septic tank is discharged to the underground chamber from. 2m. The process including digging a ditch of at least 4 feet deep and but length and with depend on the bio digester capacity. System layout 33 10. The commonly used decentralized WWTP configuration consists of a septic tank followed by some type of posttreatment or disposal of the septic tank's effluent in soak pits (Keegan et al. On sloping ground soakaway trenches should be constructed at a constant depth along one or more contours. They only hold 12 months sludge storage and if sludge starts to empty into the drainage field soil, it very quickly blocks the air spaces (porosity) in the soil, the effluent cannot soak away, you suffer a soakaway failure and the septic tank fills up. Variations of this system may include a septic tank connected to either a horizontal or vertical seepage pit. Soakaway pits/trenches are however necessary. 5m-1. Soakaway screens are put in place to eradicate suspended solids and coarse matter found in the wastewater. Design of Soak Pit. With a bio-digester, you do not need to spend a fortune on building a septic tank or soak-away. We Offer Professional Services in the above mentioned fields and others such as Bore Hole Drilling and Water Treatment. 00 Large trees 7. 2: Waterway . The soakaway must not be near any other soakaway or drainage field, as this would compromise the absorption of the ground. Compostable. O. This is a function of the proposed/expected number of the occupant of the building in question. How To Make Soakaway Pit For Septic Tank visit In today’s live septic tank TV broadcast, I will explain how to make a. Box 1923, 40478 DODOMA. However any work carried out by yourself or a contractor must be done responsibly, and must not pose a pollution risk to the surrounding environment or any water courses. It describes the steps needed to protect receiving groundwater and the constraints these may place on soakaway design and construction. The standard and volume of the septic tank is often determined by the Architect. Please like,share,comment & subscribe my channel,,for support !!!!!This video is about design of Septic tank & soak pit. Microorganisms in the anaerobic environment in the tank digest the sludge and scum. Social Considerations. Stone Soakaway Cesspool. 0 m away from building structures (DUDH, 2002), such as walls and. Scum on the surface is also prevented from leaving the tank. But the water in the soak pit generally gets soaked into the surrounding soil. The solids settle to the bottom, where microorganisms decompose them. In this article, a detailed septic distances table describes distance requirements between septic components. If you hit a layer of clay before reaching the required depth, simply make the soak away longer to make up for the lack of depth. Area (A) = V X P X 0. DESIGN GUIDELINES FOR WATER SYSTEM 3. also be considered if a septic tank and soakaway system is found to be not feasible. (Soakaway, Soak Pit. The trenches for the soakaway should be between 300mm and 900mm wide with a distance of 2m between trenches. A soakaway must be 2. Again a 4-cubic-metre (at least) ditch is requires to be filled with hardcore and act as filtration area for excess water from the biodigester. Download dwg PREMIUM . how to construct a soakaway pitdo you construct a soakaway pit?What digger do you need?How easy is it to. The cistern shall be located uphill and as far as practical from any septic tank, privy, soakaway, or leaching tile field. This is also a requirement for a loan backed by the Federal Housing Authority, or FHA, though exceptions can be. Make sure that the excavated hole is large enough for both the tank and any recommended backfill. How to build a soakaway for a septic tank. 0 below the invert level of the inlet pipe. A Soakaway is a pit or trench where surface water is allowed to collect and slowly soak into the surrounding soil or rock. It's uses small area space to produce a bio digester toilet 3. The well-established brand name, RotoTank™, has outlasted its no-nonsense 10-year warranty over and over. e I. Water supply = 200 lits/day. Library. Septic Tank Construction Septic tanks are typically pre-cast concrete, and shall have two compartments with top seam construction. Abdulrashid abdulrahim. Published by National Roads Authority, Dublin 2015 Steps: To build a basic stand-alone soakaway, dig a pit in your soft turf no less than 1m2 and 1. Manhole to be water tight on completion and be tested for water tightness a. 16 Design principles. It. Fill the hole up to about 100mm (4in) of the top with. As the effluent seeps into the ground, it is purified by the soil, which uses bacteria to digest the pollutants and remove excess nitrogen and. AND ON TOP. of users All wastes TABLE 2 SOAKAGE PIT SIZES TYPE B 5 85 75 All wastes No. One of the first things to consider when choosing a site for a soakaway is the water table. The basic functions and the need for a soak pit. Engineering. Septic tanks are a minimum of 2700 litres (650 gallons) for a 2 bedroom house. 00 3. A septic tank construction should be perfect to prevent cracking and groundwater. changed your discharge from surface water to ground. If it is, then it means that the groundwater underneath your soakaway is abstracted via a borehole somewhere and used for drinking water You will not be allowed to pollute it with sewage effluent bacteria and viruses from a septic tank or. The septic tank section is responsible for treating the wastewater naturally by separating the solid waste from the liquids. BOX 1923, 41185 DODOMA Soak Pit. Sludge digested,volume 23. A soak pit or a soakaway is a closed porous chamber that is directly connected to a primary treatment unit of residential or commercial building. The performance of any soakaway system is dependent on the soakaway construction details being designed and installed correctly. 2. 50 1. or entering the pit 2, 3. Scum on the surface is also prevented from leaving the tank. RotoTank™ has three strategically placed large factories in South Africa,. The tank should be made water tight with a 25mm coating of cement plaster, applied in two coats, in order to avoid infiltration around the tank and maintain and anaerobic space. Thanks for the replies. A septic tank soakaway drainage field system performs two functions:-. b. Routine maintenance of pipe network essential. A septic tank, a biogas settler, anaerobic baffled reactor, twin-pits, and other primary treatment units are examples. The septic tank should be large enough to hold at least the volume of wastewater collected in one day. They should consist of a carefully designed and installed system of pipes that disperse effluent to the. Septic tanks should be at least 7 metres away from any habitable parts of the building. No of persons per family = 6 nos. c. The cost to empty a septic tank is usually priced between N45,000 to N90,000. 1: Septic tank calculation tool (Excel document) 5 Footrest and drophole design 6 Checklist for concrete quality 7 Design summary for VIP latrines and UDDT toilets 8 Design considerations for difficult conditions4. Onsite septic tank systems sometimes implemented with soak-away pits are usually adopted in most buildings at low income countries of Africa because of their affordability and ease of construction. If your kitchen sink is fitted with an automatic waste grinder these volumes should be increased by 30%. Excavate a hole 300mm square to the proposed depth of the pit and trench. On a simple hierarchy of sewerage facilities, the septic tank falls between the 'long-drop pit latrine', the function ofSeptic tanks. With a bio-digester, you do not need to spend a fortune on building a septic tank or soak-away. 6m (3m long, 3m wide, 3. The clear diagrams and details provided facilitate a better understanding of the components and layout, aiding professionals and enthusiasts alike in implementing effective waste. PRESIDENT'S OFFICE, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENTS, SEPTIC & SOAKAWAY PIT. O. 4268/175 = 24 lengths of rod. In this video, I clearly show you Exactly how a septic tank works and how to build a septic system. Soakaway Collapses At NPA Quarters, Nyanya In Abuja; 3 Rescued / Appropriate Size Of Septic Tank And Soakaway Pit (1). A soakaway system normally includes screens, a catch pit, a septic tank, soakaway pit and trenches, and the associated dung channels. 8 mBuilding The House 34 - Septic Tank with Filter And 3 Wastewater Drainage WellsSUBSCRIBE and click the bell to be notified about the latest videoLike, commen. The design of a foul water drainage system means that blockages should not occur if the system has been installed properly. Septic Tank is deeper than Soakaway, unlike Soakaway, the body plastered and the floor, floored. 38 times the volume of the hole. Natural. The septic tank soakaway will not be visible and often has no means of access. Damage to the tank can result in solid waste particles clogging the soakaway, resulting in the drainage system surcharging. See popular blocks and top brands. Our tanks are built to last. When it comes to choosing a cesspit or septic tank, the choice depends on a number of factors, including location, regulation, and size of the building or the home. A dry well or drywell is an underground structure that disposes of unwanted water, most commonly surface runoff and stormwater, in some cases greywater or water used in a groundwater heat pump. Bore a hole 150mm in diameter with an auger, to a depth of one metre. 7. The Septic Tank has now been superseded by the sewage treatment plant. 6m deep) Cost Of Excavation: Manual labor was used, soil is very hard and rocky at some point so the cost of excavation would be. 00 8 Sewerage Pipe Providing, laying, fixing and testing uPVC soil, waste, vent and rain water as per BSS 4514 & 5255 or equivalent BS specifications including uPVC fittings with solvent cement jointing or rubber ring joints, 'Dadex' , 'Beta' , 'Master'make as approved by the Engineer complete in Ascertain whether or not your soakaway drainage field site is in an area designated by the Environment Agency as a Groundwater Source Protection Zone 1. Casted Septic Tank project under construction. 46 KB. size 50mm from septic depth to be fixed on site tank outlet 200mm thick blockwork wall f. Dig a trench that runs from your rainwater pipes on the side of your house to the soakaway pit. 190, a percolation test or septic tank system layout is performed by the City, there shall be paid to the Department a fee as follows: For each septic tank layout submitted, the examination shall be as set forth in PMC 8. Then dig also a little potion outside the septic tank to get lower level than ur septic tank level and the level of ur base, then insert ur pumping machine at this location and start sucking it. The void in the crate holds the stormwater during heavy ra. •Use biologically-friendly household cleaning products – don’t let commercial chemicals or bleach get into the tank. Depending on the type you have, the pipe which runs to your soakaway will either come directly from your property (usually a gutter), from an area where there is an overflow of surface water (via a system such as a French. PROPOSED CONSTRUCTION OF WOMEN VOCATIONAL CENTER LOCATION AT MALKOHI YOLA SOUTH, ADAMAWA STATE, NORTH - EAST NIGERIA DATE :MAY 2020 PREPRED BY:OKOKON Efanga// eokokon@iom. Please ensure that you follow the manufacturers detailed health and safety guidelines that will be provided in the manual when excavating your hole. Septic Tank Maintenance. Milton concrete rings. Cracked pipes. Calculate: A sp (area of base of soak pit) = 5. The soak pit is to be a hole filled with rocks. 1. Unlike the drywell described just above, in this septic effluent waste disposal, including black water and gray water, wastewater leaves the building through a main drain which enters a septic tank. System layout 33 11. ALL GLAZED OR EMBEDED IN CEMENT OPENING VERTICAL JOIST. A standard septic tank in Nigeria is 8 by 10. This means that, for every 4 meters of pipework, the trench should slope down by 100mm. You should not direct rain water into a cess pit or septic tank either. Elevation-view sketch of a tank and drywell or leaching pit or "seepage pit" system used at some older homes. No. Not widely used in South Africa, except where existing septic tank and soakaway systems have been converted for convenience and/or environmental reasons. 2) m3 is suitable for a family with 4-5 members, which has the capacity to carry 300 per lit discharge in the day. Excavated Dimensions For Soakaway = 1. Broken down, labour costs average around £240 per day. 1. Effective Vol 20 m3 Head loss 0. In this video, I clearly show you Exactly how a septic tank works and how to build a septic system. 00.