Septic tank design // soak pit design. Installation of RotoTank Septic Tank & SoakawayA "Septic Tank" is a form of holding chamber utilising a form of internal construction to slow down the flow through the tank unit. The wastewater from the septic tank seeps into the soil through the base of the pit and through the spaces in the lining material. But the water in the soak pit generally gets soaked into the surrounding soil. Casted Septic Tank project under construction. You may need to introduce columns and beams if the span is more than 4ft i. Fill with water to depth of 300mm. This video will show you just how easy it is to construct a soakaway. (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). 0m from any building sewer or septic tank and 7. 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. The well-established brand name, RotoTank™, has outlasted its no-nonsense 10-year warranty over and over. Definitions Article 2. A soak pit is a covered, porous-walled chamber that allows water to slowly soak into the ground and is also known as a soakaway or leach pit, and the pre-settled sewage from the septic tank is released to the underground chamber from where it infiltrates into the neighbouring soils. The soak pit is to be a hole filled with rocks. 4268/175 = 24 lengths of rod. 8m 3 . 5m is okay for the soak away pit. Not even all that claimed to be architect are. 38 times the volume of the hole. : 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. For instance, a septic tank soakaway can become blocked: As a result of dip pipe or baffle issues in the septic tank. Minimum capacity = 1 cubic meter (10 cubic feet). Swimming pools should not be located less than 3. 13: Not Used : WSD 7. Break up the earth at the base of the pit with a garden fork. For an easy-to-access garden, you can expect a small soakaway to cost around £1,000. 00 7. The wording shall be in Arabic and English liThe foul sewage system from this property discharges to a septic tank and soakaway. minimum dimension of the septic tank. BS6297:1983 requires that septic tank soakaway trenches should only be constructed where there is at least 1 metre of soil between the soakaway and the water table at all times. The EA can and will prosecute when pollution incidents occur. •At least once a month, check the area you are releasing water to for signs of pollution, and contact the Environment Agency if you spot any. How many Blocks Do i need to construct a soakaway Pit? For the septic tank under review, we have its length as 4268mm or 14 ft while the width is 3048mm or. The excavation can proceed in a similar manner to any deep drainage excavation. Second, it must be at least 5. traditional septic tank soakaway systems on water quality in Ireland. The soakaway pit is to be lined with stones, bricks, or concrete blocks laid up. 7K 182K views 2 years ago Civil engineering This is an illustration on how to construct a low volume septic tank plus soak pit. Essentially we are talking about a pit dug in the ground and backfilled with materials that aid the drainage. Depth = 1000 to 1300mm (min below water level) + free board = 300 to 450mm. Re: Septic Soak-away Tanks Vs Biodigesters: Make Your Choice by msbmnigeria: 12:54pm On Aug 16, 2021. 50 Soakaway 1. ADVERTISEMENT. 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. I have been searching around on the internet for advice on how best to construct a new one but have come up against a lot of conflicting information. With a bio-digester, you do not need to spend a fortune on building a septic tank or soak-away. Dry wells (also known as soakaway pits, soakwell, or soak pit), is one of the earliest models of a water runoff management system. • 29 likes • 20,173 views. A soakaway system normally includes screens, a catch pit, a septic tank, soakaway pit and trenches, and the associated dung channels. 2. We give attention to every Offer both New Jobs and Maintenance Call Us On: 08023425934,. This should govern the planning of your system and will inform whether a septic tank will be suitable for your property. Thanks for the replies. For more complex designs, soakaways can take up to two days to install and therefore are. The ideal distance between them should be 30 m i. FREE Encyclopedia of Building & Environmental Inspection, Testing, Diagnosis, Repair. Keep it. One of the simplest water drainage systems to. Bore a hole 150mm in diameter with an auger, to a depth of one metre. We recommend the second option or hiring our. 7. How To Install A Septic Tank Soakaway - How To Install A Septic System - Septic Tank Installation…What is Soak Pit? We can also call a soak pit as Soakaway or Leach Pit. xi) Where on-lot disposal systems are proposed: a. It disperses septic effluent into the soil, without causing problems due to soil saturation and 'Backing-up' of the system. 2 cuts from each length of rod. 2. 14: Not Used : WSD 7. It is hoped that. Start by digging a pit approximately 1. This is a great way for both domestic and commercial buildings to drain the. Location. Care should, therefore, be taken to fix any leakages to avoid excess burden on septic tanks and subsequent land treatment systems. 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. Design Criteria for seepage pits used to dispose of septic effluent. 100 ft. With the aid of a drilling machine, a hole of about 75mm is drilled at the side of the topmost rim above ground level to accommodate a pipe that will convey waste water that rises to that level into a chamber just beside the pit. Thus the pit latrine will be a soak-away pit. One of the first things to consider when choosing a site for a soakaway is the water table. Fill with water to depth of 300mm. 24. This draining system collects water from areas such as gutters and driveway drains which then flows down a pipe and into the hole. A septic tank is a better-designed wastewater treatment. 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. Pit Toilets (Latrines)). The soakaway system and the surrounding soil should be able to soak away the same volume in one day. For example, you could dig a soakaway pit. Scum on the surface is also prevented from leaving the tank. includes: plants and sections. 2 It should be located no closer than 30 m from a water source. 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. 0 3. 2. A soak pit is an underground structure that is designed to receive and manage surface water or wastewater. Septic Tank & Drainfield Construction Health-Safety Warnings. 0 m = 15 m 2. 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. CAD blocks and files can be downloaded in the formats DWG, RFA, IPT, F3D . A soakaway is part of the Sustainable Drainage Design. Soak pit design and Septic tank Design calculation. soak pit - Download as a PDF or view online for free. However, if you’re building a four-room bungalow for a modest family, you’ll need a regular septic tank that’s 8 by 10 and a soakaway that’s 4 by 4. And the dry well serves as a drainage field channel. Personnel employed in design and construction of septic tank. @ebcook57, Thank you for the helpful comment. It is also referred to as a soak way or leach pit or seepage pit. In the construction of soakaways, proper precautions shall be taken to prevent the side walls from collapsing while workmen are in the hole. Soakaway systems typically consist of screens, a catch pit, a septic tank, soakaway pit, and dung channels. The broken block helps to soak up the waste water making room for more intakes. The soak pit is to be a hole filled with rocks. The insides of the excavation can become smeared, particularly by mechanical diggers building a soakaway in clay soils. Percolation test procedure for surface water soakaways. 0m from any building sewer or septic tank and 7. 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. 1. 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. Soakaways can be an ideal drainage solution to deal with rainfall that doesn't naturally drain from your property. Septic Tank - General Arrangement: 4: 157KB: WSD 7. Septic tank and absorption pit dwg. 🕑 Reading time: 1 minute 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. Perforated pipe system 37 14. 4 m 3. 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. This totally depends on the size of the soakaway pit and the bar spacing. 3. 15m from any building, and sufficiently distant from any other. is directly connected to the soak pit. leach lines. For future access, a removable lid should be used to seal the pit. The discharge to the watercourse stopped and diverted to a drainfield, designed and constructed to the current British Standard 6297:2007. The broken block helps to soak up the waste water making room for more intakes. 20. Its cheaper than the obvious septic tank, its shallow as it goes for only 3 feet deep and that minimizing any possible risk, The reasons for septic tank and soakaway drainage field failure 1. This tank is usually installed below 1. Normally soakaway pit are used as disposal units but in areas with high water table they are not the best option because perforated pit would allow entrance of subsurface water. 2 The Construction of Each Soakaway 2 2. C. 5m deep in a lower part of your garden and preferably at the bottom of a slope. Sludge digested,volume 23. Reader Comments & Q&A. . According to the second defendant, there is no chance for pollution of the plaintiff's Well water by the construction of the first defendant's septic tank, as there had been a distance of 27 feet between the soak-pit and the plaintiff's Well on the eastern side and there is a distance of 25 feet between the same soak-pit and the plaintiff's. The process including digging a ditch of at least 4 feet deep and but length and with depend on the bio digester capacity. 20 Notes: * These distances should be increased to 60. Soakaway designs are crucial to ensure water is able to filter through the surfacing and head back into the environment. My property and the septic tank along with the. Period of accumulation 180 days Free board 0. . The problem is that this area has a relatively high water table, and floods occasionally during. Re: Construction Of BIODIGESTER SYSTEM SOAKAWAY In Ijebu Ode by phabulousangel ( m ): 8:30am On Jul 16, 2021. V soak = 15 × 300/1000. 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. 20 1. A soakaway is an efficient and low-environmental impact way of dealing with either foul or excess surface water in your drainage system. size 150mm min. For 16 to 20 people the size should be 1,2m x 2,6m x 1,4m deep (4 368 litres). Manhole to be water tight on completion and be tested for water tightness a. This is useful for absorbing small amounts of clean water such as the runoff from an outdoor shower or a swimming pool. The septic tank soakaway will not be visible and often has no means of access. 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. Excavated Dimensions For Soakaway = 1. CoolA septic tank is basically a vessel buried underground, the purpose of which is the collection, storage, and, to some limited extent, treatment of sewage. 8m from ground level. 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. no need of leaving this pipes all exposed if the proper work is done. Soakaways should be constructed in a circuit to make a continuous loop. (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. System layout 33 10. 3 Trench Soakaways 4 2. Excavated Dimensions For Soakaway = 1. The waste water from the biodigester is us. Damage to the tank can result in solid waste particles clogging the soakaway, resulting in the drainage system surcharging. All septic tanks require emptying ONCE A YEAR. l pp %$56 at 200mm c/c. 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. Septic tanks and sewage treatment plants are designed to prevent solid waste from exiting the tank and entering into the drainage field or soakaway. Soak Pit Construction / How to build a soakaway. The soakaway must not be near any other soakaway or drainage field, as this would compromise the absorption of the ground. So here we take sludge removal 2 years once. Septic Tank Construction 1. They have supplied multiple potable and sewage systems, to our client between 2017 and 2022. 2014). 1 SOAKAWAY PIT (1) A soak away pit shall be used for discharging effluent into pervious subsoil’s such as gravel, sand, chalk, etc. Pre-settled effluent from septic tank is discharged to the underground chamber from. How far away from from a building does a septic. If building one’s own tank from brick the walls should be at least 230mm thick, and. Generally where a precast concrete storage ring is used, the sides of the square pit should be around twice the diameter of the precast rings with the annulus filled with clean granular material. A Soakaway is a pit or trench where surface water is allowed to collect and slowly soak into the surrounding soil or rock. When is a soakaway possible? A soakaway is possible when: The ground infiltration rate is greater than 1×10-6m/s. It. Soakage well 38 15. Abdulrashid abdulrahim. Library. 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. According to recommendations by the United States Environmental Protection Agency, as well as the Department of Housing and Urban Development, a septic tank should be at least 50 feet away from a well that is used for drinking water. Depth = 1000 to 1300mm (min below water level) + free board = 300 to 450mm. It serves the function of letting the wastewater coming from the septic tank to slowly soak into the underlying ground. How a Septic tank Soakaway system or pit is designed. For example, for a septic tank serving 12 people (p) discharging to a drainage field within a Vp of 20 seconds per mm: Discharge rate to drainage field = 12 × 150 = 1,800 litres per day or 1. 50 1. Block strength not less than 5 KG/CM for Soakpit and 3. Septic Tank · November 20, 2020 · November 20, 2020For a soakaway, liquid from surface run-off, rainwater, or septic tanks, would enter the backfilled hole and drain away. 2. All soakaways must be sited at least 5m from any building or road and preferably at least 2. Pedro gonzalez ramirez. Septic Tank Design. 2. These trenches can be interconnected, a simple long trench, a herringbone layout, or a large filled pit. Septic Tank is deeper than Soakaway, unlike Soakaway, the body plastered and the floor, floored. P. It should have at least a cross-section dimension of 0. Solids accumulated 540 kgs Water Level 22. Common septic tank soakaways are constructed via long trench lines filled with a clean stone and have a slotted or holed distribution pipe. Septic tank: Length 8ft 3", width 7ft, depth 8ft 10" Soak away: Length 6ft, width 5ft, depth 6ft Carpenter N35000 Iron bender N35000 Bricklayer N65000 I think I read somewhere on this forum that the depth of a septic tank/ soak away must be 12ft. RotoTank™ has three strategically placed large factories in South Africa,. (When calculating the size of a soak pit, the volume of water storage available for a rock-filled hole is 0. For ease, we have created a simple table. A soakaway pit or trench should be located sufficiently far away from building foundations, watercourses and wells, in order to safeguard public health. SEPTIC TANK AND SOAK AWAY PIT A. . For example, you could dig a soakaway pit. 38 × 30 m 3 = 11. Read more. signs of cesspool problems. The general cost for constructing septic and soakaway tank is between N250,000 to N300,000. Building A Soakaway For A Septic TankThere are many ways to constructing and building a soakaway for a septic tank. 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,. 00 15. 2. Steps: To build a basic stand-alone soakaway, dig a pit in your soft turf no less than 1m2 and 1. A STS consists of a septic tank, a soakaway pit or some soakaway trenches, and the surrounding soil into which wastewater is finally disposed. Rods and planks also available (not on the pics) Re: Building Of A Septic/soakaway In 13 Days - Photos by ITbomb ( m ): 8:33pm On Feb 09, 2020. Septic tank and soaking pit dwg. Soak Pit Meaning: A Soak pit or soakaway is a rectangular or circular underground porous chamber that allows wastewater from the septic tank to drain off slowly into the ground. To increase the drainage in extremely waterlogged gardens, dig a trench wide enough for a drainage pipe running from the area that needs draining towards the soakaway. Namono adds that with a biodigester, you do not need to spend a fortune on building a septic tank or soak pit. One section is the septic tank, the other section is the soakaway pit. 4. Besides, the bio. Microorganisms in the anaerobic environment in the tank digest the sludge and scum. 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. Average flow 10 m3/d Ground Level 25. septic tank, twin-pits for pour-flush toilets, biogas settler, anaerobic baffled reactor, etc. See popular blocks and top brands. An increase in the volume of wastewater produced implies the soakaway to be redesigned to match the new treatment capacity needed. For septic tanks that do not drain to a stream/ watercourse the soakaway forms the mostThanks for watching my video please like and subscribe my channel for more videos. Therefore, the water table level and groundwater use should be taken into consideration in order to avoid contaminating drinking water. angle of excavation for pit depends on excavation depth and soil type; refer to annex 7 pits to be fully lined for stability and longevity, and to enable pit emptying and reuse. 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. ) and a relatively safe way of discharging it to the environment and. BOX 1923, 41185 DODOMA Soak Pit. (i) The required "effective seepage pit area" is obtained from Tables 6 and 7 which are shown below. 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). 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. Broken down, labour costs average around £240 per day. Each Brett Martin crate measures 1200mm long, 600mm wide and. Sewage generation = 85 % of water supply. The minimum width is 2’6″ and depth is 3’5″ below the liquid level and minimum liquid capacity is the 1-meter cube. Download dwg Free - 99. Purpose: To facilitate sedimentation and decomposition of small solid particles. Sokoine Building, P. On a simple hierarchy of sewerage facilities, the septic tank falls between the 'long-drop pit latrine', the function ofSeptic tanks. Septic Tanks, Soakaway Pits and Holding Tanks have been effected. Full Drainage Design Suite. It is important that the base of a soakaway is constructed on a level gradient. 20 for sewage treatment units. 3. 2) m3 is suitable for a family with 4-5 members, which has the capacity to carry 300 per lit discharge in the day. The septic tank section is responsible for treating the wastewater naturally by separating the solid waste from the liquids. You never need to replace your system. 5%) Soakaway Drop pipe (or drainage field) (100 - 150mm dia. Septic tanks are generally installed by isolated communities like schools, hospitals &. 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. 150x150mm DIA LONS 210 980 210. Some of the of the major materials for constructing Soakaway tanks and their prices includes. 50 1. Bore a hole 150mm in diameter with an auger, to a depth of one metre. These are called septic tanks. 8m wide, 1. 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. Construction details. The septic tank should be large enough to hold at least the volume of wastewater collected in one day. Septic tanks take sewage (greySeptic tanks will be regarded as temporary treatment systems. This will allow enough space for the ring to be installed and the additional volume of the annulus can be added to the overall. 8m (I. shedule of materials septic tank and soakaway pit (30-90 users) general summary amount tzs septic tank and soak away pit- dispensary a. Firstly, a soakaway 'pit' is ONLY to be used for surface roof water, not septic tank effluent. Fit the pipe A soak pit, also known as a soak away or seepage pit, is a construction feature designed to manage wastewater better. It is also known as a soakaway, septic tank soakaway, or drainage field. 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. In Nigeria, Septic Tank and Soakaway Pit are a combined system. 46 KB. Routine maintenance of pipe network essential. The price varies depending on the size of the septic tank and the time it will take to both empty and clean it. It helps manage and disperse the effluent (wastewater. of users 15 40 60 50 30 7 7 8 9 6 TYPE 3 4 1 2 40 60 3. A Looped Soakaway System. A cesspool is. Septic Tank Construction Septic tanks are typically pre-cast concrete, and shall have two compartments with top seam construction. ADVANTAGES OF BIODIGESTER SEPTIC SOAKAWAY The new Bio digester have many Advantages over the old man hole or septic tank. 25 Where: The tank which Stores a waste water of House or building is called Septic Tank. For more free help and advice visit how to construct a soakaway pit – septic tank soakaway construction. Engineering. BOX 1923, 41185 DODOMA. 080. The new rules do affect the direct discharge to a waterway as they simplify that direct septic tank discharge into a ditch will no longer be allowed. 10C: Septic Tank - R. Step 5 – Add Gravel and Complete the Soakaway. Septic Tank With Soakaway Detail AutoCAD Block. soak-pit, soakaway bed, mound, or raised bed, depending on septic design type. When installing a septic tank soakaway, it’s important to refer to Building Regulations Part H to ensure the installation meets the required standards,. Then. Soakaway pits/trenches are however necessary. Step 2 - Dig the hole. Elevation-view sketch of a tank and drywell or leaching pit or "seepage pit" system used at some older homes. 2m. . 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. Total Accumulated Sludge = 30 litres x 5 persons x 2 years = 300 Litres. Day 1 - Digging of the pit and moving of material to the site. AND ON TOP. In septic tank effluent from WC is collected. Septic tanks are also a good option if you live in a remote area, as they do not require. Materials and labour fees. ii) Detention period: In the process of designing the septic tank, the detention period should have been 24 hours. System layout 34 12. In this illustration the seepage pit is being used to dispose of graywater from non-sewage carrying drains such as a laundry, sink, or shower. Each filter offers years of effective performance. Biodigester is an on-site system, which consumes a small space of 1. Soakaways are designed to cope with a certain volume of daily wastewater used. 20. The middle layer of effluent exits the tank and travels through underground perforated pipes into the. 3 Pit sizing procedure 3. A copy of percolation test certificate issued by the Authority. 2. True to the structure and composition of a Septic System, a Dry Well Septic System comprises two main parts: the septic tank and the dry well. int MHPSS DEPARTMENT International Organization for Migration IOM IOM M07 DWG NO: SOAKAWAY PIT PLAN. A soakaway is usually formed of a rubble filled pit or a series of perforated pipes which allow the treated effluent to seep slowly into the surrounding ground. . 3 = 2. The construction of measurement detail of septic tank and absorption well depending on the users. So if we take our Brett Martin Stormcrate crates as an example, each crate holds 0. 5m deep and connected to the sewer line. Inlet and outlet pipes shall be installed with four-inch sanitary tees constructed of schedule 40 PVC or its equivalent. 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. Scum on the surface is also prevented from leaving the tank. 8m x 1. It is a hole completely filled with irregularly sized and shaped rocks. Please advise. The waste water from the bathroom, kitchen etc. The design of a foul water drainage system means that blockages should not occur if the system has been installed properly. 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. On average, you’ll pay about £3,700 for the supply and installation of a 2,800 litre septic tank. EcoBloc Flex is a modular geocellular unit which is used as a below ground stormwater attenuation or soakaway tank. Current policy is that the basic minimum facility should be a ventilated improved pit (VIP) toilet, or its equivalent. Septic Tank কি আমরা সত্যিই সঠিক বানাই 🤦How To Construct Septic Tank & Soak Pit ? বাড়ি নির্মাণের সময়. size 50mm from septic depth to be fixed on site tank outlet 200mm thick blockwork wall f. The. A standard septic tank in Nigeria is 8 by 10. A septic tank construction should be perfect to prevent cracking and groundwater. Design and Construction of Soakaway Systems 4. The next step is to set up the floor of the septic tank. The cistern shall be located uphill and as far as practical from any septic tank, privy, soakaway, or leaching tile field. This page includes describes some important construction details for soakaway pits, soakaway trenches and soakaway. . Stone-filled Dry Well. 1. It is basically a pit in the ground into which flows rainwater drainage. This is also a requirement for a loan backed by the Federal Housing Authority, or FHA, though exceptions can be. Plans containing in detail the septic tank and the soak path for the housing unit; basically the proposal has been prepared very cheaply. 2m. 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. C 150mm thick and 900mm wide around in dig where brick stays. 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. A soakaway is a subsurface structure for the temporary storage of water before it soaks in to the ground.