Now. The volume of the pit should be designed to contain at least 1,000L. (E1 Surface Water) it is recommended that the design soakage rates have an appropriate factor of safety applied to the raw soakage rates recorded. Gravel and stonebeds. This is the area where the treated water from your septic tank is distributed. SEPTIC TANK & SOAK PITS B U I L D I N G S E RV I C E S YEAR – 2018-19. The soak pits have checked the breeding of mosquitoes and. The wastewater generated in the house from the kitchen and […] March 11, 2020. 150mm. It is the simplest and cheapest method of disposal of stillage water in villages, on a small scale. METHODOLOGY The study was planned during the discussion with the facility about the soak pit undergoing the partial treatment of the effluent water coming out of primary treatment unit. It assists in gathering and securely getting rid of wastewater outside of the home. (i) A minimum liquid depth of 30 inches. Designing a complete layout. 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 Small Flows Clearinghouse. . Soak Pit must be placed at a distance of 30m (at least 20m) from. 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. 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]). A soak pit – also called a soak away or leach pit – can be. 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. A suit-An onsite wastewater treatment system is a unique system that combines a septic tank and a soil absorption field. These can be lined (like a well) or unlined and filled with rocks. 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. A soak pit is constructed in the ground by the dry brick and open joints in a circular shape. A Soak Pit should be used for discharging pre. D. So we are briefly describing soak pit design and providing structural design for soakwell in AutoCAD. This disparity is 78. g. Learn how to manage greywater effectively and sustainably in rural India with this comprehensive manual from Swachh Bharat Mission. The manual covers the sources, characteristics, impacts, and treatment options of greywater, as well as the best practices and case studies from different states. 2x1. Wastewater from the primary treatment unit will not be reused. As per MoUDGI (2008) , manual soak pits are efficient if soil conditions are good and it can reduce BOD from 93 mg/L to 1 mg/L and Fecal coliforms from log 4. This is useful for absorbing small amounts of clean water such as the runoff from an outdoor shower or a swimming pool. Step 4: Calculate the Septic Tank CapacityDesign a cost-efficient soak pit that should not negatively affect soil and groundwater properties and avoid high daily volumes of discharged effluents with the following points: Soakpit needs to be designed for a small family in a rural area having 4-5 members as daily users. (b) The flow allowance used to calculate the system design flow shall beThe design of a septic tank depends on the number of users, the amount of water used per capita, the average annual temperature, the desludging frequency and the characteristics of the wastewater (SASSE 1998) . The design of the community soak pit is according to the population of village. The design of the community soak pit is according to the population of village. 2. It should be. These can be lined (like a well) or unlined and filled with rocks. However, discharging effluent water into the environment after partial treatment through a soak pit is a safer option. Opening a pit to expose the soil profile is ideal to allow. 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. 2. Safety measures. Effective. New construction or modification of existing facilities following the effective date of this regulation must obtain authorization under a new permit. 5 to 3 yrs. 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. Septic tanks are suitable for conditions where the wastewater can drain away and be absorbed into the soil . It helps in collecting and disposing of wastewater safely away from the house. Design Considerations:Despite the low rate of sewer service coverage in developing countries, especially in small towns and rural areas, decentralized wastewater treatment systems (DEWATS) are alternatives to ensure public health. 7 Soak Pit 152 D. In areas where the ground water level below 4m a soak pit can be used. pdf), Text File (. NOTES 1. Oil and grease, if present in the sewage, rise to the surface and lead to the formation of a scum layer which acts as a thermal insulator and helps maintain the sanitary conditions around the tank. This initiative will slowly and steadily replenish the groundwater in the vicinity. Greywater Management Wastewater from bathroom, kitchen Wastewater from toilet containing faecal sludge Greywater Blackwater Liquid waste genera on* Management of wastewater from a commercial establishment, howsoever big or small is the responsibility of the concerned establishment. 1 Design of Decentralized Wastewater System . Soak Pit - Function, Types & Design. Assuming that 80% of water supplied becomes sewage, we have Quantity of sewage produced…. A = Stabilization pond B = Soak away pit. The soakfield providesSTORAGE TANK DESIGN AND CONSTRUCTION GUIDELINES rev. Septic tanks work by allowing waste to separate into three layers: solids, effluent and scum. The method used is not only disposes the wastewater but also increases the ground water level. Please like,share,comment & subscribe my channel,,for support !!!!! This video is about design of Septic tank & soak pit for any nos of people. Summary of design criteria; (d) The location of and use of the ‘reserve area’;. 5 Figure 8 Toilet pit design 6 Figure 10 Septic tank design 7 Figure 11 Inltration eld design. tSt2410(Partl)-1985 2. 33 Soak-away - A pit, dug into permeable ground lined to form a covered perforated chamber or filled with hard-core, to which liquid is led,. between 1. Soak pits are. The digester will release the water to sink through the stones and into the ground for irrigation and other gases. The immersion well should be between 1. 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. 20m(B) x 1. Sometimes the effluent of centralized wastewater treatment units or other decentralized primary treated effluents is also soaked through soak pits. 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. The review focused primarily on an A soak pit is often constructed to be 1. Pre-settled effluent from a collection and storage/treatment or (semi-) centralized. 80 m. A soak pit is a covered, porous-walled chamber that allows water to slowly soak into the ground1. This video demonstrates a practical example of how a Drainwave unit is installed in a planned absorption trench installation otherwise known as soak put cons. Septic Tank Septic tank is rectangular in plan and constructed with brick masonry over a concrete foundation. A crucial requirement for biological treatment of dairy wastewater is their pH value between 6 and 9 ( 37 ). They depend on soil with a sufficient. ALL DIMENSIONS IN MILLIMETRES UNLESS OTHERWISE INDICATED 1. 50 m (Hounkpe et al. The soak pit shall be designed utilizing soakage and storage in accordance with 9. , 2014 Read- Homemade septic Tank Design! Soak Pit Size. (1980): Design Manual - Onsite Wastewater Treatment and Disposal Systems. , 2014). wastewatermanagement,toprotectpublichealthandtheenvironment. 2. It should be used for discharging pre-settled blackwater or greywater. The soak pit should be. SOAK PIT. 8 Leach Field 154 D. Q = 120 litre/ day; For continuous water supply. It contains the following information: Design tables for soak pits and infiltration trenches. A soak pit does not provide adequate treatment for raw wastewater and the pit will quickly clog. Sanitation_SoakPitDesign - Read online for free. The Septic Tank has now been superseded by the sewage treatment plant. Key Words: Magic Soak Pit, Disposal, Unhygienic Condition Wastewater, Groundwater Recharge. Septic tanks may be appropriate for situations where the volume of wastewater produced is too large for disposal in pit latrines and water-borne sewerage is uneconomic or unaffordable. 1. Step1:-Calculate the liquid capacity of the tank. Section 4. Infiltration and soakage trenches are often encountered at the end of a treatment train, or where they receive relatively. Many people prefer a. In this study, the wastewater collected from a septic tank is passed through a partially converted anaerobic filter, and a vertical flow constructed wetland (VFCW) before being sent to a soak pit. • Your sites soak pit, if you are not connected to a reticulated storm water system • Unsealed areas (open ground) or where unpiped runoff leaves your site • Storm water treatment systems, for example: • oil or grease interceptors - flow control or shut-off devices on sumps - swales - ponds - filtersFor wastewater samples, 20 (10 from each area) septic tanks were selected for sampling. This led to breeding of mosquitoes and insects and spread of diseases like diarrhoea. 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. The Absorption area of the soak pit could be 1 sqm to 1. The recommended retention time is usually 1 to 3 days, depending on the local regulations and the tank’s design. As liquid leaches from the pit and migrates through the unsaturated soil matrix, pathogenic germs are sorbed to the soil surface. Design Considerations The soak pit should be between 1. pvc sn16 unless noted otherwise. Define. 6. The specific design will depend on factors such as the type of soak pit (e. A _____ is a chamber made of concrete, fiberglass, PVC or plastic, through which domestic wastewater, sewage flows for primary treatment. 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. 34. Q is the rate of water supply. A Soak Pit does not provide adequate treatment for raw wastewater and the pit will clog quickly. 38 times the volume of the hole. 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. 1 Introducti on 50 4. 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. The volume of wastewater shall be determined by one of the following:All domestic waste water treatment systems, including septic tanks, must be registered with your local authority. SOAK PIT : A pit, dug into permeable soil lined to form a covered perforated chamber or filled with sand at the bottom and gravel or broken bricks at the top into which effluent from septic tank or storm water. 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. In a conventional septic tank system, also called ‘septic system’, a subsoil dispersion system such as the soak pit or dispersion trenches follow the septic tank. Purpose : To collect wastewater from dung channels and to facilitate removal of solid matters. 1 Fate of carbon and energy in aerobic (above) and anaerobic (below) wastewater. There is a fee of €50 to register your waste water treatment system. wastewater and solid waste is being discharged and dumped into the open land and water sources unsafely. Giving customers a chance to treat Design of an 8-Person Soak Pit wastewater partially at a low cost. Soak pit specialists. These unsafe disposal is one of the ambiguities to maintain ourINDIVIDUAL HH SOAK PIT – TYPE DESIGN. “Earlier, grey water was discharged in the open, resulting in waterlogging, bad odour and increased incidence. This IS Code provides various requirements that have to be met while constructing a septic tank, so that it meets minimum standards. Total volume req = 10200+2400 = 12600 lit or 12. Design of Septic Tank Along With Soak Pit For 30 Users. 10. How Soak Pit Design Work Adequacy. 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. A soak pit is a covered, porous-walled chamber that permits water to soak into the ground slowly. uses caustic soda also known as lye (sodium hydroxide: NaOH) as an additive to create a highly alkaline environment and thereby sanitises sludge from human waste. 2. 50 11 TABLES TABLE 1: Determining capacity of septic tank based on use conditions. An outlet pipe directs the surface water to the soak pit. In a study conducted in Moldova, Banks et al. This standard covers the design and construction of septic tank for small installations (up to 20WasteWater. a) Power generator. 5m to 4m but never less. 38 × 30 m 3 = 11. WA = 540 L / 50 L/m2 = 10. 5 and 9. 0. 5m, there is an increased risk of collapse. Effluent falls in the pit- and is allowed to be. C cover with manhole is provided at the top of the tank. Please like,share,comment & subscribe my channel,,for support !!!!! This video is about design of Septic tank & soak pit for any nos of people. The procedure for the removal of the sludge has been elaborated. • Community Soak pits are usually constructed at the Design Considerations. Wastewater composition refers to the actual amounts of physical, chemical and biological constituents present in wastewater. A soak A soak pit is an underground structure that disposes pit is a covered, porous-walled chamber that allows water of unwanted water, most commonly storm water runoff, by to slowly soak into the ground. A soak pit, or leach pit, is a covered chamber; typically rectangular, square, or circular with porous-wall to allow the septic tank effluent to slowly soak into the ground. = 0. (Magic Sock Pit. low-tech solution for discharging wastewater. 12,78,379 household and community soak pits. (b) Permeability of Soil. A soak pit is a type of effluent disposal system used to treat and dispose of the effluent coming out of a pre-treatment system, safely to the ground. WA = 540 L / 50 L/m2 = 10. The design of the community soak pit is according to the population of village. The tables found below can be used to design soak pits or infiltration trenches for inputs of 80, 120 and 160 litres of wastewater daily. The main purpose of the Sewage treatment process is to remove the various constituents of the polluting load: solids, organic carbon, nutrients, inorganic salts, metals, pathogens, etc. Design Considerations: (a) Soakaway pit should be sufficiently large to avoid flooding and overflow. The soak pit should be kept away from high-traffic areas so that the soil above and around it is not compacted. The Waimakariri District Council has responsibility for the following functions: Urban stormwater. It should be located at a safe distance from a drinking water source (ideally more than 30 m). FREE SEPTIC TANK DESIGN DOWNLOAD. This reduces the quantity of solids and also changes its composition to sludge, which builds up in the bottom of the tank. SO. Gravel and stone beds are called infiltration trenches or stone swales when used for stormwater control. 7. 80 m, depth = 4. The septic tank was designed to store the wastewater at the minimum period of 18 hours to 24 hours, it is called detention period. Containment (septic tank and soak pit): The septic tank is sealed and impermeable but the soak pit is permeableSoak Pit Design. Total Accumulated Sludge = 30 litres x 5 persons x 2 years = 300 Litres. Between 55 and 75% of the home waterThe objective of this lecture is to introduce the fundamentals of hydraulics for the simple design of water supply and sewer pipes (see also [7242-water distribution pipes]). A soak pit is an essential part of any home drainage system. The minimum capacity of the pit should accommodate all the wastewater produced during one washing or in one day, whichever figure is the greater. 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. 2 Residential Wastewater Characteristics 50 4. Soak pit are best suited to soils with good absorptive properties; clay, hard packed or rocky soils are not appropriate. The immersion well should be between 1. Environmental Engineering/Policy Program. . Soak Pit Design. Q is the rate of water supply. A new on-site design should be able to function within the limited space limitations, which are often not sufficiently addressed by the current sanitation policy. In areas where the ground water level below 4m a soak pit can be used. com for any support, inquiry or product-purchase related query. It serves the function of letting the. 1. 80 m(D) INDIVIDUAL HOUSEHOLD SOAK PIT • This type of Individual HH Soak Pits can be. (pits, chambers and trenches) that allow infiltration to the ground through their base and sides and that incorporate below ground storage. ) and a relatively safe. 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. As a property owner, you are responsible for maintaining your onsite wastewater system and knowing how it works. An Absorption well also known as a soak pit or a Resapan (in Indonesian) has three main uses. The top is closed by RCC slab. C. August 23, 2022. •Disposing excreta into the dispersion system like soak pit/leaching pit. This residue is commonly classified as primary and secondary. These can be lined (like aA soak pit is a fairly old-fashioned method of dealing with household wastewater and sewage. As part of a full drainage system it is an efficient and low environmental-impact way of dealing with surface water (also called runoff, rain water or storm water). Sometimes the effluent of centralized wastewater treatment units or other decentralized primary treated effluents is also soaked through soak pits. IMPORTANT: This is the surface area of just the sides of the pit. A __________ is a chamber made of concrete, fiberglass, PVC or plastic, through which domestic wastewater, sewage flows for primary treatment. 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. Where a soak pit is required, a building consent application with calculations for soak pit sizing must be approved by the building consent authority. Design Characteristics: BOD Total Suspended Solids Fecal Coliform : : : 170 370 mg/l 250 mg/l 5 x107 MPN/100ml. , are based on Shasta County California's septic code cited below. 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. A soak pit is an essential part of any home drainage system. 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. 4. 4 Soak pit sizing Assume a soak pit size and calculate its volume. 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. WA = 540 L / 50 L/m2 = 10. 1 A 100 HECTARE CATCHMENT A soak pit is a small, shallow pit dug in the ground to receive and treat wastewater. Fill the test hole with water to a depth of at least 300mm (12in). AdvantagesS. Milk and butter factories have effluents with active reaction close to neutral (pH=6. Minimum soakaway drainage field distances. 6 m. In a conventional septic tank system, the collected effluents in the tank flow to the soil adsorption field for final. Its primary function is to allow wastewater to gradually percolate into the surrounding soil, where natural processes help treat and filter the effluent before it. ) Provision of alternative material of magic soak pit. The sludge can safely be used as manure. A soak pit is constructed in the natural ground by the dry bricks with open joints in a circular shape as shown in the below picture. So here we take sludge removal 2 years once. Then the surface water runs to the soak pit through an outlet pipe. 5 and 4 m deep, but generally speaking, never lower than 2 m above the water table. Determine the Purpose: Decide whether the soak pit will be used for stormwater management or wastewater treatment. The greywater that passes through the soak pit is filtered. The increased contact time with the active biomass (sludge) results in improved treatment. Percolation test waiver procedures. Soil absorption system Seepage pit or soak pit: unlined and filled with stone or brick 50 SEPTIC TANK 51. The. Sludge Digestion Tank. To provide effective drainage for areas that flood. 0. If you do not have a central collection facility, how do you dispose of your wastewater? A = Wastewater soak away pit B = Open discharge on the surface C = Irrigate vegetables D = Others (specify)A soak pit is a covered, porous-walled chamber that allows water to slowly soak into the ground and also known as a soak away or leach pit, and the pre-settled sewage from the septic tank is release to the underground chamber from where it infiltrates into the neighboring soils. V₁ = N * Q * T. 5 and 4 m deep3, but as a rule of thumb, never less than 2 m above the groundwaterThe soak pit is a pit through which the effluent is allowed to filter or seep into the surrounding soil. Soak Pit’s Function. In this article, What is Soak Pit, Meaning, Purpose, Need, Advantages and Disadvantages, Estimate of Soak Pit Excel, Quantity, Design, Construction Procedure, Health. 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. (ii) Discharge into other soil absorption systems as soak pit or seepage pits and leaching cess-pools. This page contains information about the district’s water supplies and sewer services and what you need to do to connect to those services. The wastewater generated in the house from the kitchen and […] March 11, 2020. Hydraulic Design & Construction of Sewers. 10. DEWATS (Decentralized Wastewater Treatment System) is a wastewater treatment system that is both cost-effective and efficient, especially in poor nations. The soak pit is a covered walled chamber that is porous and allows wastewater to slowly soak into the ground after a secondary treatment. The pre-settled sewage from the septic tank is released to the underground chamber, where it infiltrates into the neighboring soils. 8 m2 WA =Wall Area DF = Daily Flow SIR = Soil infiltration rate (See table 1). This urine stream contains about 80% of the N, 56% of the P and 63% of the K found in domestic wastewater [18]. Using a soak pit will help you cut down on the amount of contaminated water released into the environment. The design of CW is explained in section 4. Step 4: Calculate the Septic Tank Capacity Design a cost-efficient soak pit that should not negatively affect soil and groundwater properties and avoid high daily volumes of discharged effluents with the following points: Soakpit needs to be designed for a small family in a rural area having 4-5 members as daily users. INLET AND OUTLET TEES. 2. 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 and 4 m deep, but as a rule of thumb, never less than 2 m above the groundwater table. septic tank, twin-pits for pour-flush toilets, biogas settler, anaerobic baffled reactor, etc. 2. A Soak Pit does not provide adequate treatment for raw wastewater and the pit will clog quickly. INTRODUCTION The magic soak pit is an underground structure used to dispose the wastewater. 0. It should be located at a safe distance from a drinking water source (ideally more than 30 m). Every day we deliver safe drinking water to your home, and to businesses, through our drinking water network. 10. 5 m and 4 m deep but as a general rule, never less than 2 m above the groundwater table. 1. It is an underground pit, filled with stones which filter solids that get slowly digested by bacteria. This filling can also replace the lining, by supporting the walls from inside. Looking for a Dream Home? We can help you realize your dream of a new home. 2. ) and a relatively safe way to discharge it into the. 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. Download the full pdf and join the movement for a. So we are briefly describing soak pit design and. Brick Wall Soak Pit-Brick wall soak pits are square or round-shaped septic tanks. It should be a minimum of 18 m and preferably 30m away from any source of drinking water, such as well, even bore to mitigate the possibility of bacterial pollution of the water supply. The technology is located underground and thus, humans and animals should have no contact with the. compartment is the soak away pit. 5 and 4m deep, but never less than 1. The absorption area of the soak pit could be 1 Sqm to 1. The wastewater generated in houses like water used for bathing, washing clothes and utensils is commonly disposed in this pit. 2. The septic tank section is responsible for treating the wastewater naturally by separating the solid waste from the liquids. Liquid waste is also called wastewater. It should be located. Connect Grey Water pipeline into the rings. The soak pit is five feet deep with a diameter. 1. wastewater. The sludge can safely be used as manure. Design Consideration of Soak Pit. 5 and 4 m deep, but as a rule of thumb, never less than 2 m above the groundwater table. The soak pit must be constructed where the site does not gather surface ruff off the water, which leads to clogging of the soak pit resulting in water stagnation. INTRODUCTION The magic soak pit is an underground structure used to dispose the wastewater. Soak Pit Design. 3. It serves the function of letting the wastewater coming from the septic tank to slowly soak into the underlying ground. By utilising a soak pit, you can reduce the amount of contaminated water being released into the. Even in areas with a high density of pit latrines, microbiological groundwater contamination may not necessarily be. 3 Site Evaluation Strategy 17 3. The soak pit’s wastewater infiltration can be used to recharge the groundwater. Septic tanks are a common wastewater management solution that has been in use for a long time. Capacity of tank required = 10200/24 x 24 = 10200 lit. 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. The soak pit should be kept away from high-traffic areas so that the soil above and around it is not compacted. (pits, chambers and trenches) that allow infiltration to the ground through their base and sides and that incorporate below ground storage. DISPOSAL OF EFFLUENT FROM THE SEPTIC TANK. A stone-filled dry well is the simplest of all seepage pits. 4. Septic tank may be made up of RCC, fiberglass, plastic, etc. 6). 10 Floating Plant Pond 158 D. 1. 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. 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. Water races: While not a drainage function, the. Malik Enroll- 190/11 Roll no. Also the faecal sludge needs to be correctly disposed and further treated (e. Design considerations Toilet: The toilet should be made from concrete, fibre-glass, porcelain or stainless steel for ease of cleaning and designed to prevent stormwater from infiltrating or entering the pit 2, 3. 2. Next day, refill the test section with water to a depth at least 300mm (12in).