A soakaway for a septic tank is very different from a soakaway used for excess surface water dispersal and you will need an expert to. Damage to the tank can cause problems for the soakaway. 70, pp. Manhole to be water tight on completion and be tested for water tightness a. The soakaway is an underground soil treatment system, which receives partially treated dirt water from the septic tank. . Septic tanks take sewage (greySeptic tanks will be regarded as temporary treatment systems. 2. Yes it's a septic tank soak away. The well-established brand name, RotoTank™, has outlasted its no-nonsense 10-year warranty over and over. 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. 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. Soakaway crates can be used to create a large storage volume or deep bore soakaways can be installed to. 2 Deep Bored Soakaway 3 2. +234 9020-090-9764. For the Septic tank design, the depth of the tank should not be less than 1. 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. O. 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. A soakaway is part of the Sustainable Drainage Design. On 2022-02-17 by ebcook57developed the Septic Tank Design Manual to address the dearth of ready to use guide while designing a standard septic tank. In this video, I clearly show you Exactly how a septic tank works and how to build a septic system. Our tanks are built to last. 2. Break up the earth at the base of the pit with a garden fork. septic tank and soak away pit- dispensary a. Maintenance and Management of Soakaway Systems 6. Excavated Dimensions For Soakaway = 1. 1: Pit sizing calculation tool (Excel document) 4 Septic tank design procedure 4. Calculate: A sp (area of base of soak pit) = 5. Septic tank section, plan, soak away system and plumbing details that includes a detailed view of method of fixing water gauge meter for domestic aise withing the cavity of boundary wall, septic tank plan details, elevation and all sided sectional details, dimensions details, manhole plan details, water depth detail, memory of material details,. Impermeable soils require that stand alone. Septic tanks are suitable for the disposal of night soil in rural and urban areas which don’t have sewerage systems. Septic tank and absorption pit dwg. includes dimensioned plans and construction sections with technical specifications. Soakaway pits/trenches are however necessary. 1 Sewers shall be. They are only for rainwater and surface water soakaways. Herringbone. It saves more money as compare to the cost in constructing a septic tank. The scum, composed of waste that’s lighter than water, floats on top. . Then out a layer of your landscaping fabric across the surface. Again the sampling was purposive to ensure that septic tanks with soakaway pit are included but at the same time ensuring uniform spatial distribution of the tanks (Map 2 and 3). RM 2EHY5MF – Front garden drive soakaway technique for capturing, retaining and slowing the flow of rainfall - gabion gabions stone filled retaining wall. 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. construction and ppt of soak pit. Well setbacks & clearances to septics, property lines, buildings, etc. A septic tank is a key component of the septic system or sewer system. System layout 33 11. into the septic tank through connecting pipes. Area (A) = V X P X 0. 080 and any reexamination required shall be as set forth in PMC 8. Biodigester is an on-site system, which consumes a small space of 1. 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. w. The septic tank should be large enough to hold at least the volume of wastewater collected in one day. #1. They are also referred to as dry wells, soak wells or soak pits in other countries, but in the UK are known as soakaways. 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. cesspool to septic costConclusion. Septic Tank & Drainfield Construction Health-Safety Warnings. alternatives, inspection methods Defects in onsite waste disposal systems, septic tank problems, septic drainfield problems, checklists of system components and things to ask. The waste water from the biodigester is us. The standard and volume of the septic tank is often determined by the Architect. 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. THE SOAKAWAY SYSTEM A soakaway system normally includes screens, a catch pit, a septic tank, soakaway pit and trenches, and the associated dung channels. You should not direct rain water into a cess pit or septic tank either (see our project. Bury the soakway by digging the ground from inside. and will be uneconomical and waste of money for a tank meant for a small household. A soak pit, also known as a soakaway or septic tank soakaway, is an underground structure designed to receive and disperse wastewater from septic tanks or other. As part of your soakaway design stage you need to consider the make up of the ground. 8m x 1. 15E: Mild Steel Cover and Frame to 915 Square Manhole Opening. The design and construction of this vermicomposting toilet system is very simple. A septic tank is a single-story underground, watertight tank in which sewage is retained long enough to allow sedimentation. Soak pit design drawing of empty soak pit with lining. A standard septic tank in Nigeria is 8 by 10. 2m average depth 1. These are some of the advantages. A single hole will be excavated, concrete masonry wall is built around the four walls, concrete masonry wall is built to separate the pit into two sections. Step 2. From excavation to. Namono adds that with a biodigester, you do not need to spend a fortune on building a septic tank or soak pit. 2m by 1. e I. RotoTank™ has three strategically placed large factories in South Africa, in. C. A STS consists of a septic tank, a soakaway pit or some soakaway trenches, and the surrounding soil into which wastewater is finally disposed. septic tank -provisional b. 10C: Septic Tank - R. In the construction of soakaways, proper precautions shall be taken to prevent the side walls from collapsing while workmen are in the hole. This includes both the cost of materials for building Soakaway tanks as well as labour charges. The soil on a site must be suitable for a soakaway to work properly. 0 3. Septic tank drainage field costs vary depending on its size and type. 11 Sep 2016. ) and a relatively safe way of discharging it to the environment and. It helps manage and disperse the effluent (wastewater. Essentially we are talking about a pit dug in the ground and backfilled with materials that aid the drainage. Palmer offers the construction of a soak away. Less often, soakaways are also used to dispose of effluent from septic tanks, known as "leaching fields". In North America approximately 25% of the population relies on septic tanks; this can include suburbs and small towns as well as rural areas. (e. You may need to introduce columns and beams if the span is more than 4ft i. & Social Science 11th Building, Mlezi Road, P. A soakaway is part of the Sustainable Drainage Design. 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. Sludge digested 237. Septic Tank (for pig farms) Covered Access Vent Pipe o ak w y Trench Soakaway Pit . Water Science and Technology. A drainfield (Figure 6. Planning Soakaway Construction. Septic Tank Soakaway Design Guide. 5 3. A Soak Pit, also known as a soakaway or leach pit, is a covered, porous-walled chamber set in the ground that allows water to slowly percolate. A soak pit, also known as a soakaway or leach pit, is a covered, porous-walled chamber that allows water to slowly soak into the ground. O. septic tank, twin-pits for pour-flush toilets, biogas settler, anaerobic baffled reactor, etc. 8m wide, 1. The soakaway pit is to be lined with stones, bricks, or concrete blocks laid up. OTHER INFORMATION. 1. Within the septic tank and soakaway range detailed above if septic tank systems already in place, otherwise capital cost much higher. The recommended size of a septic tank is a function of the volume of wastewater it receives. : A soak pit which is also called a soakaway is a closed porous wall chamber that is primary design to allows water to slowly. 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. For more free help and advice visit how to construct a soakaway pit – septic tank soakaway construction. It is also known as a soakaway, septic tank soakaway, or drainage field. A septic tank is a primary sedimentation tank with a long detention time of 12 to 36 hours, as opposed to 2 hours in a regular sedimentation tank. 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. 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 drain), or from a private system such. 2) m3 is suitable for a family with 4-5 members, which has the capacity to carry 300 per lit discharge in the day. Farms which can achieve very high levels of dry removal ofsolidwaste,andlowlevelsofwateruse(ie. 16 Design principles. Box 743, P. Day 5: Block work starts. The resulting calculation will give you. Volume for sludge Depth of Tank 2m. The soakaway system and the surrounding soil should be able to soak away the same volume in one day. manu manoj. Use M-15 grade of P. 3. 7. This is the case for domestic driveway or garden soakaways and larger commercial systems. Dig a trench that runs from your rainwater pipes on the side of your house to the soakaway pit. We Offer Professional Services in the above mentioned fields and others such as Bore Hole Drilling and Water Treatment. how to construct a soakaway pitdo you construct a soakaway pit?What digger do you need?How easy is it to. C 150mm thick and 900mm wide around in dig where brick stays. The septic tank separates the solids, dense liquids, and effluent. 1. Damage to the septic tank itself - internal damage to parts of the septic. A septic tank is a better-designed wastewater treatment. (i) Laterals leading to each seepage pit must be at least four inches in diameter with a minimum slope of 1/8 inch per foot. Days - 4days. This is useful for absorbing small amounts of clean water such as the runoff from an outdoor shower or a swimming pool. Further liquid domestic-based wastes. Reason 4: Septic Tank construction and septic system capacity. This is a function of the proposed/expected number of the occupant of the building in question. The well-established brand name, RotoTank™, has outlasted its no-nonsense 10-year warranty over and over. Adequate care must be taken to design, construct, operate and maintain the septic system so that it can provide. The biological tank break down human waste into water by help of aerobic a reactions and the water is then soaked away into a soakaway pit or french drain. The solids settle to the bottom, where microorganisms decompose them. For more complex designs, soakaways can take up to two days to install and therefore are. Septic Tank is deeper than Soakaway, unlike Soakaway, the body plastered and the floor, floored. Dry wells (also known as soakaway pits, soakwell, or soak pit), is one of the earliest models of a water runoff management system. A septic tank may be more suitable for properties with high water usage, while a soakaway may be more suitable for properties with low water usage. Septic tanks must be constructed to standard design. Fill the hole up to about 100mm (4in) of the top with. 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 instructions The pipe within your soakaway construction should be laid to a fall of 1 in 40. Blocked pipes. Bore a hole 150mm in diameter with an auger, to a depth of one metre. how deep is a cesspool. The septic tank design is such that it maintains the sewage in the tank for 24. 8m. Schedule of Material. This. 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. How to build a soakaway for a septic tank. This system occupies minimal space and does not emit stench like the ordinary septic tanks or soak-away. For ease, we have created a simple table. The reasons for septic tank and soakaway drainage field failure 1. Detailed design guidance is given in BRE Digest 365 or CIRIA Report C753. Besides, the bio-digester appear small, but. b. The length of the septic tank should be 2. A soakaway is a drainage pit filled with stones that diverts water into the surrounding soil. Natural. For future access, a removable lid should be used to seal the pit. Each Brett Martin crate measures 1200mm long, 600mm wide and. If your kitchen sink is fitted with an automatic waste grinder these volumes should be increased by 30%. For instance, a septic tank soakaway can become blocked: As a result of dip pipe or baffle issues in the septic tank. The soil factor and design of construction . Soakage. No of persons per family = 6 nos. (i) The required "effective seepage pit area" is obtained from Tables 6 and 7 which are shown below. Expect to pay between £830 and £1,140 to install a soakaway drain underneath a driveway. 00 3. you should have made the precast septic tank because of the site nature. This tank is usually installed below 1. Materials such as the crate, membrane, pipe, gully, and. 50 Soakaway 1. 8m wide, 1. For example, you could dig a soakaway pit. It allows the wastewater collected from the septic tank of the building to soak into the underlying ground. 25m3 of water, so 1m3 divided by 0. how to construct a soakaway pit - septic tank soakaway construction This video will show you just how easy it is to construct a soakaway pit. The construction of measurement detail of septic tank and absorption well depending on the users. 5%) Soakaway Drop pipe (or drainage field) (100 - 150mm dia. A cesspool is. The main function of a soak pit is to slowly soak the wastewater coming from the septic tank into the ground. Ecoflo finds a better way. So here we take sludge removal 2 years once. One of the first things to consider when choosing a site for a soakaway is the water table. Damage to the tank can cause problems for the soakaway. Drainage field problems such as soggy areas of ground or ‘pooling’ around the tank or soakaway. Tunnel system 37 13. Stone Soakaway Cesspool. A soakaway is essentially a point feature; it does not have a channel. Sanitary and rain drainage. Definitions Article 2. soakaway pit and septic tank. no need of leaving this pipes all exposed if the proper work is done. But the water in the soak pit generally gets soaked into the surrounding soil. Start by digging a pit approximately 1. For a soakaway, liquid either from a septic tank or rainwater would enter the backfilled hole and drain away. Water supply = 200 lits/day. Soakaway screens are put in place to eradicate suspended solids and coarse matter found in the wastewater. How To Build A Soakaway For A Septic TankWould you like to know how to build a septic tank for a soakaway?Would you like to know what soakaway products to us. A soakaway is essentially a point feature; it does not have a channel. The soakaway system and the surrounding soil should be able to soak away the same volume in one day. It will also show you which septic tank scenarios work best. xi) Where on-lot disposal systems are proposed: a. In other words, cesspools provide temporary. you should consult a professional used to this kind of work, u would not understand even if I explain. 3. 20 for sewage treatment units. 2m-1. Rubble. 4 m 3. ii) Detention period: In the process of designing the septic tank, the detention period should have been 24 hours. The walls of the tank can be made of poured, reinforced concrete, stone masonry, brick or concrete blocks. Percolation test procedure for surface water soakaways. Scum on the surface is also prevented from leaving the tank. The following points offer a quick overview of the main rules for septic tanks: Tank must be rated to BS EN 12566-1 standards. cesspool treatment. In this video, I clearly show you Exactly how a septic tank works and how to build a septic system. It disperses septic effluent into the soil, without causing problems due to soil saturation and 'Backing-up' of the system. Septic Tank Design. Using the allocated pipe and an elbow, fix the pipe at the end of the biodigester. It uses naturally occurring aerobic soil bacteria to further clean the pollutants in the effluent. Hello, guys in this article we will discuss the design of the septic tank and soak pit. Step 10: Add a Waste Feed Pipe. The septic tank and soakaway pit isSize Of Soakaway and Septic Tank. If there is no intention or no need to reuse wastewater, collected stormwater or greywater, soak pits can offer a cost-efficient opportunity for a partial treatment of waste- grey- or stormwater from a primary treatment (e. RotoTank™ has the largest variety of tanks in Southern Africa, making tanks from as small as a 50lt-tank to up 40 000lt TANK. Not even all that claimed to be architect are. Septic tanks and sewage treatment plants are designed to prevent solid waste from exiting the tank and entering into the drainage field or soakaway. It should be directed into the rainwater or storm drain system of the mains drains or into a soakaway, but never into a foul water system. For small tanks theOnce it sinks to the level u actually wang it, get a water pump and start sucking out the water inside the septic tank. The outlet of the septic tank should be compulsorily connected to a soak pit. The soak pit may be of any suitable shape preferably circular. In contrast, the effluent is usually removed by the pumping machine or sewerage vehicle in the septic tank. Dis- infectnation. The purpose of a soak pit is to allow the water to slowly infiltrate into the surrounding soil, where it can be naturally filtered and purified. a septic tank is provided; and . 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. THE CHOICE AND CONSTRUCTION OF SOAKAWAYS 2 2. V soak = 15 × 300/1000. 38 times the volume of the hole. shedule of materials septic tank and soakaway pit (30-90 users) general summary amount tzs septic tank and soak away pit- dispensary a. Septic Tank With Soakaway Detail AutoCAD Block. This system occupies minimal space and does not emit stench like the ordinary septic tanks or soak-away. soak away pit -provisional total materials cost for septic tank and soakaway pit april, 2018 page/2 po-ralg how to construct a soakaway pit - septic tank soakaway construction This video will show you just how easy it is to construct a soakaway pit. Soak Pit – Need and Functions. Fill your pit; Fill the bottom of your pit with about 15cm of compacted sand or shingle. . 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. 5m deep and connected to the sewer line. However, when the municipal sewerage system is absent, one has to provide a septic tank and soak pit. It. 90 m and a minimum depth of 1. 2014). 7) is a field where the effluent from a septic tank is disposed of. septic tank soakaway clay soil - septic tank soakaway clay soilyour septic tank and soakaway in clay soil?Are you installaing. WSD 7. The septic tank section is responsible for treating the wastewater naturally by separating the solid waste from the liquids. Summary: Step by step guide and video showing how to build a septic soak away, calculate the size and construct a within regulations and complete a percolation test. 1. 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 around N35,000. See full list on civilplanets. The top 3 septic tank problems. On a simple hierarchy of sewerage facilities, the septic tank falls between the 'long-drop pit latrine', the function ofAlso Watch My Other Videos Link is Given Below: Videos are available in English । विडियोज़ हिन्दी में भी दिए गए हैं ।(video related to. Septic tank and absorption pit dwg. Septic tank is made up of concrete,. Sokoine Building, P. Leave it to dry for over a week or so. Fill your pit; Fill the bottom of your pit with about 15cm of compacted sand or shingle. RM HPG59X – Digging a drain soakaway in a small front garden. Design the septic tank soakaway to avoid blockages. All septic tanks require emptying ONCE A YEAR. 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. The soakaway must not be near any other soakaway or drainage field, as this would compromise the absorption of the ground. We have been working with Nanotech on various projects, in Ghana. 8m 3. Take sludge settled down per person – 30 liters/year. 1meter diameter. The soil around where the soakaway is planned must be granular, with good drainage properties. You can exchange useful blocks and symbols with other CAD and BIM users. and will be uneconomical and waste of money for a tank meant for a small household. 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 all you need to do is simple decide on the type of soakaway crate you require, and divide 1m3 by the volume of each individual crate. Dig a trench that runs from your rainwater pipes on the side of your house to the soakaway pit. Cast in situ concrete septic tank 20 6. Inlet and outlet pipes shall be installed with four-inch sanitary tees constructed of schedule 40 PVC or its equivalent. One section is the septic tank, the other section is the soakaway pit. The cistern shall be located uphill and as far as practical from any septic tank, privy, soakaway, or leaching tile field. The soakaway pit and drainage trench can be dug by hand with a shovel, or you can hire a mini digger to make the work easier for you. g. Septic tanks take sewage (greyRM G2GD91 – Soak away crate in position in a domestic garden ready to be wrapped and buried for drainage. drain pipe 100 mm diameter, 1. Soakaway Construction. Design Criteria for seepage pits used to dispose of septic effluent. Septic tank and soaking pit dwg. 3 Pit sizing procedure 3. #8. 6 kgs Tank bottom 20. 6m (3m long, 3m wide, 3. This draining system collects water from areas such as gutters and driveway drains which then flows down a pipe and into the hole. Surface water soakaway drainage crates that fill a pit dug to allow rainwater to soak away. The septic tank should be large enough to hold at least the volume of wastewater collected in one day. Pipework to transfer the rainwater from the gutters, driveway, patio etc, to the soakaway. Septic tank and absorption pit. The soak. Important Update: Under. A septic tank is basically a vessel buried underground, the purpose of which is the collection, storage, and, to some limited extent, treatment of sewage. A septic tank settles the solids in the wastewater and then discharges the liquid septic waste to the ground through a well designed and made drainage field – Not an Ezy drain, tunnel, soakaway crate, or soakaway pit. System layout 32 8. or entering the pit 2, 3. ) Be warned, soakaway crates and tunnels are NOT allowed for septic tank and sewage treatment plant drainage fields. . The cost of constructing these drainage systems varies according to the size, cost of building materials, and cost of services in that particular location. 2m by 1. 0 below the invert level of the inlet pipe. The material used in the construction of septic tank range from stone or brick masonry to concrete for a bigger community septic tank. AND ON TOP. This technique is commonly used for discharging wastewater and it also helps in recharging groundwater bodies. The septic tank should be large enough to hold at least the volume of wastewater collected in one day. Step- One. leach lines. 0m from any building sewer or septic tank and 7. Soakaway Pit Design. Here are the steps to design a soak pit: Determine the size of the. Broken down, labour costs average around £240 per day. 8m 3 . On 2022-02-18 by Inspectapedia Com Moderator . Soakaways should be constructed in a circuit to make a continuous loop. While they may be effective for managing stormwater runoff, they do not filter or treat effluent, which can be detrimental to groundwater. Hello!my name isJoannaAnd today, I will be teaching you about septic tanks and soakaway pits. The general components of a soakaway system are described below: i) Dung Channel Purpose : To collect and convey wastewater to the inlet of the catch-pit. 2. There often is little science in the exact size, depth, and construction of a soakaway. Pre-settled effluent from a Collection and Storage/Treatment or (Semi-) Centralized Treatment technology is discharged to the underground chamber from which it infiltrates into the surrounding soil. This totally depends on the size of the soakaway pit and the bar spacing. The phrase soakaway is often, wrongly, used in relation to septic tank and sewage treatment plant discharges to ground: A soakaway is used for surface water (rainwater from roofs, paved areas etc) A soakaway is typically a hole or structure filled with rubble / drainage crates) Septic tanks can ONLY discharge to ground via a drainage field. Septic Tank Soakaway Construction The soak-pit is connected to a primary treatment unit and serves as a connection between the septic tank and the ground. (Soakaway, Soak Pit. soak away pit -provisional total materials cost for septic tank and soakaway pit april, 2018 page/2 po-ralg. These are inadmissible for wastewater dispersal. SHOVEL FINISHING ON PIPE. 2. (4) The soakaway/French drain should not be located less than 2. In terms of other jobs, installing a new soakaway drain beneath a lawn would cost between £580 and £840. A soakaway pit or trench should be located sufficiently far away from building foundations, watercourses and wells, in order to safeguard public health. 4. Some of the of the major materials for constructing Soakaway tanks and their prices includes. minimum dimension of the septic tank. Wrap your soakaway crate in the geotextile membrane, making sure the membrane covers any outward-facing surfaces, including the pipe entry point. Drainage fields allow wastewater to be safely dispersed into the ground and prevent pollution—they must meet British standards. ) So: V stor = 0. Effective Vol 20 m3 Head loss 0. Description. 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. Download dwg Free - 99. The soakaway system and the surrounding soil should be able to soak away the same. . O. . BOX 1923, 41185 DODOMA Soak Pit. Both work in the same way — removing excess water. It is important that the base of a soakaway is constructed on a level gradient. Hi All, I'm looking for some advice, if there is any that can be given I'm in the midst of planning a large extension, and the last part of the building warrant requirement if the approval of a rainwater soakaway design. So here are the Typical Details of Septic Tank and Soakaway form the dwgnet. 4 Construction, Operation and Maintenance of Septic Tanks A septic tank is a large underground, watertight container, although the size of the tank is legally determined by the number of bedrooms in the house, it is about 2. 25 Where: The tank which Stores a waste water of House or building is called Septic Tank. Septic Tank Construction Septic tanks are typically pre-cast concrete, and shall have two compartments with top seam construction. Care should, therefore, be taken to fix any leakages to avoid excess burden on septic tanks and subsequent land treatment systems. Microorganisms in the anaerobic environment in the tank digest the sludge and scum. This is a great way for both domestic and commercial buildings to drain the. Oxfam (2008): Septic Tank Guidelines.