These example specifications for a septic disposal field, also referred to as drainfield, leach field, soakbed, soak trenches etc. 2. 48 KLD greywater is produced per day. Here are the main functions of soak pit. Notes to both of the tables above. then in most cases it has a septic tank system (also known as an On-site Wastewater Disposal System, or Subsurface Wastewater Disposal System) to dispose of the wastewater. A Soak Pit does not provide adequate treatment for raw wastewater and the pit will clog quickly. Gravel and stone beds are called infiltration trenches or stone swales when used for stormwater control. 5m to 4m but never less. Soak Pit - Function, Types & Design. Design Principals Septic tank * Aqua privy – a variation of the septic tank Simplified septic tank Only one chamber (settling chamber) Biogas is vented trough a pipe Supernatant is used to protect as a seal for the sludge to prevent smell, flies etc. clay, hard packed or rocky soil is not appropriate. Explanations of the equations used for soak pit and infiltration trench calculations. •Disposing excreta into the dispersion system like soak pit/leaching pit. The wastewater generated in the house from the kitchen and […] March 11, 2020. In a conventional septic tank system, the collected effluents in the tank flow to the soil adsorption field for final. The wastewater produced by homes is separated into two types grey water and black water, with grey water making up the majority of the flow. Scribd is the world's largest social reading and publishing site. 5 m, and it must be located at least 10 m away from any water-bound bodies in saturated soil conditions. tSt2410(Partl)-1985 2. Anaerobic bacteria decompose the sludge during this time, resulting in sludge. 5 and 4 m deep, but as a rule of thumb, never less than 2 m above the groundwater table. The majority of the wastewater management system requires a soak pit for this partial treatment. 1. April 20, 2021 by civilbull A soak pit is a covered, porous-walled chamber that permits water to soak into the ground slowly. Next day, refill the test section with water to a depth at least 300mm (12in). 12,78,379 household and community soak pits. iii) Catch-pit. US EPA's Design Manual for Onsite Wastewater Treatment and Disposal, 1980, available from the US EPA, the US GPO Superintendent of Documents (Pueblo CO), and from the National. Design of septic tank with soak pit for 30 users are as follows: Design of Septic Tank Assume, rate of water supply = 135 lit/capita/day. The soak pit should be kept away from high-traffic areas. The soaking pit should be raised above ground level and the surface water should not enter into the soak pit. The pit design allows action of aerobic microbes, turning excreta into compost within few months. How to Construct a Soak Pit | What is Soak Pit | Types of Soak PitStart Your COPs Training NOWJoin this Training and get started:- As per the septic system manual (MoWHS-SNV, 2013), the minimum requirement of a soak pit diameter is 1. Design. A soakaway system normally includes screens, a catch pit, a septic tank, soakaway pit and trenches, and the associated dung channels. SEPTIC TANK & SOAK PITS B U I L D I N G S E RV I C E S YEAR – 2018-19. What is a Soak Pit? Soak pits are a water sensitive urban design (WSUD) mechanism that relies on the stormwater principles of retention and infiltration. 5 and 4 m deep, but as a rule of thumb, never less than 2 m above the groundwater table. January 13, 2021 Drainage. Prior two are of rectangular shape and later is generally of circular shape. ALL DIMENSIONS IN MILLIMETRES UNLESS OTHERWISE INDICATED 1. 5 to 2. III. Latrines, pipes and channels, cesspools, and soak pits were key elements of sewage systems of that era. 1. 3. This IS Code provides various requirements that have to be met while constructing a septic tank, so that it meets minimum standards. Soak Pit - Function, Types & Design. Varieties include supa pits, mega pits or splay pits. removed, physical and chemical contaminants removed. 2. Percolation test waiver procedures. What is the wastewater from kitchen sinks called? a) Grey water b) Black water c) Yellow water d) Brown water. Soak Pits are designed to discharge pre-settled blackwater or greywater. 5m to 4m. 2 Disposal Alternati ves 13 3. The middle layer of effluent exits the tank and travels through underground perforated pipes into the. The following applies to all septic tanks regardless of material. The effluent can be removed in a soak pit. Based on this 24. 3 Nonresi dential Wastewater Characteri sti cs 57Septic tank is designed to store wastewater in a minimum period of 18 hours to 24 hours, called the detention period. The wastewater generated in the house from the kitchen and […] March 11, 2020. Even in areas with a high density of pit latrines, microbiological groundwater contamination may not necessarily be. 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. This initiative will slowly and steadily replenish the groundwater in the vicinity. 5 and 4 m d eep but, as a general rule,. Download the full pdf and join the movement for a. 0. (1) General Requirements. 50m from water abstraction points, boreholes, springs. Step-by-step sample. The soakfield providesSTORAGE TANK DESIGN AND CONSTRUCTION GUIDELINES rev. The shape and design is similar to those of a water well, but dry wells are filled with gravel, or surrounded by gravel, and usually covered from sight. Part B. The top is closed by RCC slab. 12. A type of system for final wastewater treatment and subsurface discharge, which may include a leach field, seepage pit, mound, subsurface drip field, or evapotranspiration and infiltration bed. A Soak Pit. wastewater. Effluent falls in the pit- and is allowed to be. In addition, wastewater treatment plants could become net producers of energy instead of energy consumers by. Soak pit are best suited to soils with good absorptive properties; clay, hard packed or rocky soils are not appropriate. The soak pit should be. Design Calculation Sewage Pit - Free download as PDF File (. 7. A factor of safety of 0. (An Unit Of Birama Construction) prepares your soak pit design that offers an economic opportunity for waste-water management. A septic tank is an underground chamber made of concrete, fiberglass, or plastic through which domestic wastewater (sewage) flows for basic treatment. 1. Sewage sludge is the solid, semisolid, or slurry residual material that is produced as a by-product of wastewater treatment processes. 5 and 4 m deep, but as a rule of thumb, never less than 2 m above the groundwater table. , 2014Read- Homemade septic Tank Design! Soak Pit Size. WA = DF / SIR e. 2. DISPOSAL OF EFFLUENT FROM THE SEPTIC TANK. 2. Guidelines for soak pit design, including sizing, are provided in Verification Method E1/VM1 to New Zealand Building Code clause E1 Surface water or can be obtained from your local council. Domestic Wastewater:- Means the effluent, including settleable materials (sludge) and scum discharged from water closets, ablutions, kitchens…etc, of houses and institutions. Settling and anaerobic processes reduce solids and organics, but the treatment efficiency is only moderate (referred to as “primary treatment”). 0 m (Mondal et al. Critical design parameters include a hydraulic retention time (HRT) between 48 to 72 hours, up-flow velocity of the wastewater less than 0. 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. It should be remembered that the depth should not be taken below the water table; The diameter of the pit depends on the volume of effluent and the. A septic tank is a wastewater treatment system that separates solid waste from liquid waste and allows the liquid to flow out for further treatment or disposal. wastewatermanagement,toprotectpublichealthandtheenvironment. In areas where the ground water level below 4m a soak pit can be used. If there is no intention or need to reuse wastewater, collected rainwater or gray water, immersion pits can offer an economic opportunity for partial treatment of waste-water or ash from a primary treatment (eg septic tank, double pits for flush toilets, biogas collector, deflector anaerobic reactor, etc. 5 m diam eter and depth of 3 m trench with 3. Liquid waste is also called wastewater. is a type of residential wastewater that is created during activities including bathing, laundry, clothes washing, and dishwashing. Adequacy. Aggregate: 20mm coarse aggregate & fine aggregate = sand. The method used is not land and gutters which creates unhygienic condition only disposes the wastewater but also increases the ground which causes different diseases to people living water. Capacity testing and policy applicable to vertical seepage pits. WA = 540 L / 50 L/m2 = 10. 1 Soak pit tank A soak pit is essentially a hole designed with the purpose of allowing wastewater to infiltrate into the ground. Containment (septic tank and soak pit): The septic tank is sealed and impermeable but the soak pit is permeableDrainage, Septic Tank Soak Away and Water Table Replenishment. Brick Wall Soak Pit-Brick wall soak pits are square or round-shaped septic tanks. Also study identifies that the magic soak pit method is unhygienic the wastewater in rural areas is disposed off on open and safe to dispose the wastewater. The soak pit should be kept away from high-traffic areas so that the soil above and around it is not compacted. 10. Ecological engineering for wastewater treatment or ecological sanitation (ecosan) implies that principles of ecology are applied to design and implementation of wastewater treatment systems (see aso [7561-sustainable sanitation], [7564-linking up sustainable sanitation water management and agriculture]). The soak pit is either left empty or filled with boulders or gravel, which will help prevent walls from collapsing, but still has adequate space for wastewater. Soak Pit Soak Pit does not provide adequate treatment for raw wastewater and the pit will clog quickly. Based on this 24. PART 1 DESIGN CRITERIA AND CONSTRUCTION Arrangements for installing tanks in parallel for the treatment of sewage for population of more than 300 persons have been included. In this Video I will explain about soak pit | soak pit construction | soak pit for septic tank | soak pit for wastewater #SoakPit-----. The. Topics covered in the orientation session include, but are not limited to the following: 1. 4. = 0. Thus, one of the two pits is to be used alternately. 50 11 TABLES TABLE 1: Determining capacity of septic tank based on use conditions. wastewater pipes shall be 150mm dia. Open navigation menu. 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. Part one of this manual provides a description of the design of WSPs, while Part two provides a detailed description on the. The rainfall intensity used in the design of the soak pit shall be that of an event having a duration of '1 hour and a 10% probability ofAbstract. Sludge Digestion Tank. - 52 Sec- A. To know construction mechanism. at community level as a measure for management of the greywater generated. Sometimes the effluent of centralized wastewater treatment units or other decentralized primary treated effluents is also soaked through soak pits. 12. To study the advancement the design of soak pit. According to the IS CODE 2470 Part-2, 1985 Soak pits could be constructed of any size. Fill the test hole with water to a depth of at least 300mm (12in). Wastewater from the primary treatment unit will not be reused. To replenish the water table by absorbing rainwater. 1. . Soak Pit Structure 6-8 inches diameter kept at center of the. 6 of Clause E1 of the NZ Building Code to ensure that surface water is discharged without overflowing. Septic Tank: In rural areas where houses are spaced so far apart that a sewer system would be too expensive to install, people install their own, private sewage treatment plants. Detention period = 24 hour. Some primary considerations that must be taken while designing or constructing the soak pit, as follows: 1. 1. The sludge is pumped up by hand, collected in a container and taken away for disposal. Capacity testing and policy applicable to vertical seepage pits. This presents a high risk of soil and underground water pollution as the infiltrated wastewater can come inThe purpose of this chapter is to set forth provisions for planning, design and installation of waste disposal systems in and out of. The wastewater generated in houses like water used for bathing, washing clothes and utensils is commonly disposed in this pit. Then the surface water runs to the soak pit through an outlet pipe. Effluent from the septic tank is not pure thus needs further treatment for which it is sent to the soak pit. These will slowly decompose and can be harvested as a soil amendment on. The Absorption area of the soak pit could be 1 sqm to 1. (2002) concluded that groundwater pollution within villages was likely caused by latrines, livestock and stored manure, solid-waste landfills, and leakage from wastewater pits. 0. So we are briefly describing soak pit design and. ) and a relatively safe way of discharging it to the. To RememberSeptic Tank & Soak Pit Design Calculation in ExcelSeptic Tank Design no of user 50Soak pit design no of user 50# civil & structural knowledge(pits, chambers and trenches) that allow infiltration to the ground through their base and sides and that incorporate below ground storage. The separate collection of feces and urine without any flush water has many advantages, such as odor-free operation and pathogen reduction by drying. A soak pit is constructed in the ground by the dry brick and open joints in a circular shape. As liquid leaches from the pit and migrates through the unsaturated soil matrix, pathogenic germs are sorbed to the soil surface. The design of the community soak pit is according to the population of village. As a result of the implementation of this work, approximately 200 litres of grey water/wastewater per school is being recharged into ground on a daily basis, and 53 schools have been benefitted. (b) Design and Installation. 5. If none of the options in these tables are appropriate for your needs, then you will have to design your soak pit or infiltration trench by hand. D. Dimensions: 1. 5. 1. Such soak pits are often provided to retain water until peak flows in the outfall have passed and it is normally considered sufficient to design them for an event having a 10 minute duration and a 10% probability of occurring annually. The solids being heavier than thePits prepared within the absorption area often settle after the system has been installed and may disrupt the distribution network. 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. A soak hollow is one covered, porous-walled chamber that allows water to slowly soak into the ground. A tight tank is a sealed container. Many people prefer a rectangular type. In both cases, a layer of sand and fine gravel should be spread. itself and the soak field. infiltration is likely to be severely limited. WASTEWATER (GREY WATER) PIPES: PIPE GRADIENT = PIPE DIAMETER. Loose brickbats are laid at the bottom to improve the soaking quality. are suitable for management of Grey water generated from. 48 KLD greywater is produced. (When calculating the size of a soak pit, the volume of water storage available for a rock-filled hole is 0. (1980): Design Manual - Onsite Wastewater Treatment and Disposal Systems. . How a septic tank system works. Introduction of Soak Pit Design. Sometimes the effluent of centralized wastewater treatment units or other decentralized primary treated effluents is also soaked through soak pits. Using a soak pit will help you cut down on the amount of contaminated water released into the environment. without contaminating ground water where it is extracted. A sewerage system, or wastewater collection system, is a network of pipes, pumping stations, and appurtenances that convey sewage from its points of origin to a point of treatment and disposal. ] The writers of the Health Act put it mildly: cesspits and drywells, when used for receptacles of human waste, are a nuisance. A soak pit is generally a circular porous covered pit, through which the effluent or wastewater is allowed to be absorbed into the surrounding soil if there is no need to reuse it. Normally, the chambers are all of the same depth (between 1. DESIGN PROBLEM a. The soak pit should be covered by the precast slab. Learn how to manage greywater effectively and sustainably in rural India with this comprehensive manual from Swachh Bharat Mission. Explanation: Soak pit is a circular pit through which sewage is disposed in the soil. 8–7. In the following information we will be focusing on the city of Auckland which is the most populated and quickest growing region in New Zealand. Soak pit promotes eco-friendly practices by minimizing environmental impact and protecting water sources from contamination. This reduces the quantity of solids and also changes its composition to sludge, which builds up in the bottom of the tank. Septic tanks provide partial treatment of wastewater. 16 Pit for disposal of. When the second pit is full, the first pit should be used by diverting the discharge from second to first pit. The design of the community soak pit is according to the population of village. The outlet of the septic tank should be compulsorily connected to a soak pit. Septic Tank Septic tank is rectangular in plan and constructed with brick masonry over a concrete foundation. It is well designed rectangular or circular water tight structure provided with one, two or three chamber used to treat liquid wastes into high settleable solids. Using a soak pit will help you cut down on the amount of contaminated water released into the environment. 20. The rainfall intensity used in the design of the soak pit shall be that of an event having a duration of '1 hour and a 10% probability of The soak pit should be between 1. This is useful for absorbing small amounts of clean water such as the runoff from an outdoor shower or a swimming pool. A soak pit is a covered, porous-walled chamber that allows water to slowly soak into the ground1. 6 of Clause E1 of the NZ Building Code to ensure that surface water is discharged without overflowing. . SOAK PIT • A soak pit, also known as a soak awat or leach pit, is a covered, porous-walled chamber that allows water to slowly soak into the ground. The Function of Soak Pit: A sock pit serves the capacities as given beneath: It gathers the wastewater from the essential treatment unit or homegrown use. 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. an older style septic tank and soakage trench or soak hole system; a new modern septic tank and land application system (such as dosed trenches, or. A soak pit, also known as a soakaway or septic tank soakaway, is a simple and effective way to manage wastewater from a household or small-scale development. The size of the pits varies according to the amount of wastewater generated and the quality of the soil. wastewater servicing professional to investigate as follows: (a) For an older unknown. Need for Soak Pit. These are used for the discharge of domestic and industrial wastewater. [en. drainage of roading or driveways. Further, according to the building codes of Bhutan (2002), standard sizes for the building of septic tanks and soak pits are required in order to regulate urban wastewater management. 6 Sludge - Sludge is the settled solid matter in semi-solid condition. The activated sludge is subsequently separated from the treated wastewater (mixed liquor) by settlement, and most of it is returned to the process. The study identifies that the magic soak pit method is unhygienic and safe to dispose the wastewater. design criteria must be applied to the settlement tank and soakaway system. NOTES 1. Intermediate. Unlike the drywell described just above, in this septic effluent waste disposal, including black water and gray water, wastewater leaves the building through a. This set of Civil Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Design of Septic Tanks”. Opening a pit to expose the soil profile is ideal to allow the evaluator to do the examination. Soak pits, which can be lined with porous supported, which deployment foundational support until prevent collapse out the underground chamber, allow also be used for separate treatment of greywater. DETENTION PERIOD:- 12 to 36 hrs (adopted 24hrs) LENGTH TO WIDTH RATIO:- Length is 2 to3 times of width. The soak pit is five feet deep with a diameter. It assists in gathering and securely getting rid of wastewater outside of the home. The inputs and outputs of soak pits and cesspits are illustrated in Figure 3. The septic tank was designed to store the wastewater at the minimum period of 18 hours to 24 hours, it is called detention period. 2. Plasticizers: SP-430 =0. So soak pits are preferred where the soil is porous in nature. 2. Design Considerations of Soak Pit Design. A Soak Pit does not provide adequate treatment for raw wastewater and the pit will clog quickly. at community level as a measure for management of the greywater generated. 5 Sqm per head of the user. The methods of disposal are: (i) Sub-surface irrigation employing absorption field method. A soak pit does not provide adequate treatment for raw wastewater and the pit will quickly clog. settled contents of pit latrines and septic tanks. You can register and pay online at protectourwater. Soak pits can provide an economical opportunity for a partial treatment of wastewater or ash from a primary treatment (e. Which makes it a reasonable choice for water reaping. In 2011, it was predicted that the P from human urine and feces alone, could provide 22% of the global P demand [23]. , 2014). The soak pit design shall be as per the standards laid. treatment processes, anaerobic suspended growth treatment reduction in biochemical oxygen demand, Waste Water Treatment process. coarse material. Mark the hole 75mm (3in) from the bottom and 75mm (3in) from the top by pushing 6 inch nails into the sides of the of the percolation test hole. 10 m and 1 m depth below the inverted level of the inlet tube. Design of Septic Tank 7 Design Principles 8 Design Parameters 8 Design Steps 8 Construction of Septic Tank 12 Site Selection 12 Points to Ponder during Construction 12 Operation and Maintenance of Septic Tank 13 Inspection of Septic Tank 14 Cleaning/Desludging of Septic Tank 14 Major Do's and Don'ts of Septic Tank 15 Soak Pit 15 Community Soak pits. Installation of soak pits is also recommended near hand-pumps, stand posts, etc. 5). DETENTION PERIOD:- 12 to 36 hrs (adopted 24hrs) LENGTH TO WIDTH RATIO:- Length is 2 to3 times of width. 1. A biological wastewater treatment process by which biologically active sludge (concentrated biomass) is agitated and aerated with incoming wastewater. 11 Water Disposal/Groundwater Recharge 160. A suit-An onsite wastewater treatment system is a unique system that combines a septic tank and a soil absorption field. V. Since the Soak Pit is odourless, installed underground and wastewater kept away from human contact, even the most sensitive communities may have little acceptance issues. 6. Design Considerations The soak pit should be between 1. Deep pits can last up to 20 or more years. V₁ = N * Q * T. Effluent wastewater streams from industries are discharged into the soak pits and. Septic tanks are suitable for conditions where the wastewater can drain away and be absorbed into the soil . The Soaking pit should be raised above ground level and surface water should not enter into the soak pit. pvc sn16 unless noted otherwise. Based on this the diameter of the soak pit is given as 1. Learn how to dimension a wastewater pit optimally, including practical calculation examples. It is commonly used in areas where the soil has good percolation rates, allowing for effective filtration and treatment of effluent. 5 and 4 m deep. Purpose : To collect wastewater from dung channels and to facilitate removal of solid matters. The detention period of a septic tank is _____. 150mm. CAPACITY OF SEPTIC TANK:-capable of storing sewage flow during detention period &extra volume of sludge for . Soak Pit’s Function. See details at DRYWELL DESIGN & USES. Waste water coming from all Building to septic tank= 10 x 6 x 200 x 0. On the other hand, leaching pits, primarily ideal for rural or low-density settings, directly discharge wastewater from the dwelling unit into the surrounding subsurface for. septic tank, double pits for flush. Kedalla Design and Construction (pvt) Ltd No:247 1/3 Peradeniya Road, Kandy (20000) Sri Lanka Hotline: 0702 222 111. Introduction of Soak Pit Design. While the first standard for small septic. in consultation with the community leaders, can design and implement a solution. the wastewater to pass through. The majority of the wastewater management system requires a soak pit for this partial treatment. It helps in collecting and disposing of wastewater safely away from the house. It should be made sure that only pre-settled black or grey wastewater post-primary treatment is admitted within the soak pit. The absorption area of the soak pit could be 1 Sqm to 1. The objective of waste water treatment is to remove polluting material so that the treated water can be released safely back into the environment. Offering an environment-friendly method of releasing We chose a (1. The soak pit should be kept away from high-traffic areas so that the soil above and around it is not compacted. In some areas, the pipes connect the septic tanks into soak pits. During this time period, the sludge was decomposed by the biological action of anaerobic bacteria and the solid waste settled down as sludge. Wastewater is made up of 99 percent water and about 1 percent. The soak pit is either left empty or filled with boulders or gravel, which will help prevent walls from collapsing, but still has adequate space for wastewater. Completion time: 30 minutes. (Magic Sock Pit. Combined sewers. around. The Auckland Unitary Plan provides guidelines for the design and construction of soak pits. B. 10 Floating Plant Pond 158 D. The soak pit shall be designed utilizing soakage and storage in accordance with 9. 38 times the volume of the hole. Malik Enroll- 190/11 Roll no. The depth of the soak pit must be between 1. Infiltration area (iA): The surface area required to infiltrate the amount of wastewater entering the pit. Septic tanks take sewage (grey water - washing and household waste and black water - sewage from latrines,) but not rainwater. On the other hand, leaching pits, primarily ideal for rural or low-density settings, directly discharge wastewater from the dwelling unit into the surrounding subsurface for. 5 to 3 yrs. Q is the rate of water supply. Soak Pit Construction / How to build a soakaway. There are the following considerations for the design of a soak-pit such as; It should be between 1. A Soak Pit does not provide adequate treatment for raw wastewater and the pit will clog quickly. In this Video I will explain about soak pit | soak pit construction | soak pit for septic tank | soak pit for wastewater #SoakPit ------------------------------------------- Download Pdf:. Numbers in bold-face are those more-widely accepted or most inquired by our readers. Flow of water is always downward. Additional criteria specific to the public water system or other types of storage tankThe wastewater from the storm drains used to enter the pond and contaminate the water. , 2014 Read- Homemade septic Tank Design! Soak Pit Size. They depend on soil with a sufficient. The retention time is the duration for which the wastewater remains in the septic tank for treatment before it overflows to the soak pit or drainage field. Effluent from septic tank disposal Soak pit/ Cess pool A closed circular or rectangular pit through which effluent will be soaked or absorbed into the surrounding soil Two- Filled or Empty type. How Soak Pit Design Work Adequacy. The. CAPACITY OF SEPTIC TANK:-capable of storing sewage flow during detention period &extra volume of sludge for . Sewers should be laid at least 3. 1. 1 This code gives recommendations for the design, layout, construction and maintenance of drains for waste water, surface water and subsoil. 5 to 3 yrs. 2021). 80 m(D) INDIVIDUAL HOUSEHOLD SOAK PIT • This type of Individual HH Soak Pits can be. It collects excess water and allows it to naturally percolate into the surrounding soil, preventing waterlogging and reducing runoff. The filled up pit can be conveniently emptied after 1. 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. The volume of sewage settlement. 2 The Standard originates from a review of available information on the fate and transport of road contaminants and the design of existing road soakaway systems. 5 Figure 8 Toilet pit design 6 Figure 10 Septic tank design 7 Figure 11 Inltration eld design. 2. Design Considerations of Soak Pit Design. 1. the twin-pit design was introduced and in this case when one pit is full, the excreta is diverted to the second pit. 15m from any building, and sufficiently distant from any other soakaway, including roof water. Soak pits are. Effluent wastewater streams from industries are discharged into the soak pits and. REFER TO ANNEXES 5 AND 5. A stone-filled dry well is the simplest of all seepage pits. It should be located at a safe distance from a drinking water source (ideally more than 30 m). These smaller particles are digested by microorganisms, resulting in a long-term degradation process. In plants where a certain amount of whey is discharged, the pH of the effluent is reduced to below 6. These can be lined (like aA soak pit is a fairly old-fashioned method of dealing with household wastewater and sewage.