details a suggested design approach complete with worksheets and design charts to assist applicants to determine which stormwater soakage system should be adopted. By utilising a soak pit, you can reduce the amount of contaminated water being released into the. 1. A soakaway system normally includes screens, a catch pit, a septic tank, soakaway pit and trenches, and the associated dung channels. How to Construct a Soak Pit | What is Soak Pit | Types of Soak PitStart Your COPs Training NOWJoin this Training and get started:- per the septic system manual (MoWHS-SNV, 2013), the minimum requirement of a soak pit diameter is 1. 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. Design of Soak Pit 16 Design Steps 16 Table of content. 2. It is a type of soil absorption system - a smaller version of leach fields and is suitable for treating and disposing of small effluent discharges. A stone-filled dry well is the simplest of all seepage pits. 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. To provide a septic tank soak away where a drain field is not possible. It should be used for discharging pre-settled blackwater or greywater. Domestic Wastewater:- Means the effluent, including settleable materials (sludge) and scum discharged from water closets, ablutions, kitchens…etc, of houses and institutions. 1 Estimating of septic tank, soak pit. 6). 1 Introduction 13 3. understand the physical design of their system and, secondly, to understand the need and the procedures for. 50 m (Hounkpe et al. 5 to 4 m deep, but it is recommended that the distance between the bottom of the soak pit and the groundwater table should be ≥ 2 m ( Tilley et al. Featuring a large permeable porous walled chamber, the Soak Pits are located at the end of a stormwater drainage network, hence the lowest lying point, buried underground and out of sight. The design of the community soak pit is according to the population of village. During this time period, the sludge was decomposed by the biological action of anaerobic bacteria and the solid waste settled down as sludge. 12. It should be located at a safe distance from a drinking water source (ideally more than 30 m). (E1 Surface Water) it is recommended that the design soakage rates have an appropriate factor of safety applied to the raw soakage rates recorded. Soak pits are very low in cost for construction, operation and maintenance. Based on this 24. The technology is appropriate for rural and peri-urban settlements. It is an underground pit, filled with stones which filter solids that get slowly digested by bacteria. 2. The design of the community soak pit is according to the population of village. A soak pit – also called a soak away or leach pit – can be. 1 Fate of carbon and energy in aerobic (above) and anaerobic (below) wastewater. Detention period = 24 hour. Safety measures. 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. is a type of residential wastewater that is created during activities including bathing, laundry, clothes washing, and dishwashing. Ideally, the recommended distance of a soak pit from the drinking water source is 3. Septic tank process&design - Download as a PDF or view online for free. It serves the function of letting the wastewater coming from the septic tank to slowly soak into the underlying ground. 4 m 3. Septic Tank Functions of a Septic Tank The septic tank provides a number of important functions in terms of physical and biological changes. around. Soak Pit Soak Pit does not provide adequate treatment for raw wastewater and the pit will clog quickly. The soakfield providesSTORAGE TANK DESIGN AND CONSTRUCTION GUIDELINES rev. The review focused primarily on an A soak pit is often constructed to be 1. Introduction to Sanitation Technologies 13 Understanding Sanitation Technologies 15 On-Site Systems 18 Off-Site and Hybrid Systems 21 Treatment of Wastewater and Fecal Sludge 22 Reuse of Treated Wastewater and Sludge 25 Summary of Common. 1. See more ideas about septic tank design, septic tank, sewage system. Suppose there is no need to reuse wastewater collected from stormwater, greywater, and black water. Effluent wastewater streams from industries are discharged into the soak pits and. So we are briefly describing soak pit design and providing structural design for soakwell in AutoCAD. Depths can range from about 1. DETENTION PERIOD:- 12 to 36 hrs (adopted 24hrs) LENGTH TO WIDTH RATIO:- Length is 2 to3 times of width. The sludge can safely be used as manure. The design of the community soak pit is according to the population of village. It promotes a context-specific. SEPTIC TANK & SOAK PITS B U I L D I N G S E RV I C E S YEAR – 2018-19. The effluent can be removed in a soak pit. 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. Materials such as grease and oil float to the surface in the tanks to form. Kedalla Design and Construction (pvt) Ltd No:247 1/3 Peradeniya Road, Kandy (20000) Sri Lanka Hotline: 0702 222 111. Soak Pit: A soak pit is a dug-out pit that is filled with graded stones and gravels. The soak pit discharge clear and non-harmful water to the ground. The Waimakariri District Council has responsibility for the following functions: Urban stormwater. It is called the detention period when the wastewater in the septic tank intends to store for at least 18 hours to 24 hours. Do not store it for longer than 48 hours as bacteria growth will start to affect the quality of the water. Anaerobic bacteria decompose the sludge during this time, resulting in sludge. Sludge Digestion Tank. 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. • 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. Design. 2. A tight tank is a sealed container. Wastewater composition refers to the actual amounts of physical, chemical and. Brick Wall Soak Pit-Brick wall soak pits are square or round-shaped septic tanks. Completion time: 30 minutes. By utilising a soak pit, you can reduce the amount of contaminated water being released into the. Prevent suspended solids from being. Because it may contain pathogens, nutrients and other harmful contaminants, wastewater needs treatment before it. . 2. 1 Soak pit tank A soak pit is essentially a hole designed with the purpose of allowing wastewater to infiltrate into the ground. 2. Soak Pit Soak Pit does not provide adequate treatment for raw wastewater and the pit will clog quickly. Gravel and stonebeds. These example specifications for a septic disposal field, also referred to as drainfield, leach field, soakbed, soak trenches etc. 5 and 4 m deep, and not less. The Soak Pit can be left empty and lined with a porous material (to provide support and prevent collapse), or left unlined and filled with coarse rocks and gravel. g. The immersion well should be between 1. The outlet of the septic tank should be compulsorily connected to a soak pit. [online copy. Effluent from the septic tank is not pure thus needs further treatment for which it is sent to the soak pit. 5. A Soak Pit should be used for discharging pre settled black water or grey water. (lot connections shall be 100mm as per watercare standards). residential soak holes. This disparity is 78. Explanations of the equations used for soak pit and infiltration trench calculations. It provides guidance on: 1. Effective. coarse material. 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. a Table of Contents Soak pit: Design Procedure of Soak Pit|Advantages and Function of Soak pit What is Soak pit? A soak pit is also known as the soak way is a covered. The wastewater can easily soak on the ground. The soak pit is constructed with brick masonry in the shape of a square or circle. Sanitation_SoakPitDesign - Read online for free. The pit is usually filled with a layer of loose stones, brick bats and brick ballast. Thus the two pits can be used alternately and perpetually. ALL parts of the soakaway drainage field are required to be a minimum of: 10m from a watercourse or ditch. It serves the function of letting the. The pit need not be constructed in case of hard strata but for loose strata, the brick lining should be done without plastering. The volume of sewage settlement. 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. Grey water; Methods. Take sludge settled down per person – 30 liters/year. I. This page contains information about the district’s water supplies and sewer services and what you need to do to connect to those services. A soak pit is an underground structure designed to manage water drainage efficiently. Unit Operations for Wastewater & Preliminary Treatment. It is unlikely a full size system would be soaked with 40 to 50 times its volume prior to the design storm occurring. The septic tank was invented in the 1860's and is the original piece of sewage equipment used for the treatment of sewage in rural areas. Soak pit are best suited to soils with good absorptive properties; clay, hard packed or rocky soils are not appropriate. The Absorption area of the soak pit could be 1 sqm to 1. According to the IS CODE 2470 Part-2, 1985 Soak pits could be constructed of any size. A soak pit is constructed in the ground by the dry brick and open joints in a circular shape. 2. It contains the following information: Design tables for soak pits and infiltration trenches. The immersion well should be between 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. Let take @120 liters per user as i have told you to consider above. Collect your used kitchen water in a container with a lid and place it somewhere out of the way until you are ready to use it. Even in areas with a high density of pit latrines, microbiological groundwater contamination may not necessarily be. Depth should be between 1. 8 m2 WA =Wall Area DF = Daily Flow SIR = Soil infiltration rate (See table 1). 5 and 4 m deep, but as a rule of thumb, never less than 2 m above the groundwater table. ie. 2 Disposal Alternati ves 13 3. Waste water coming from all Building to septic tank= 10 x 6 x 200 x 0. . Explanation: Soak pit is a circular pit through which sewage is disposed in the soil. 2 Residential Wastewater Characteristics 50 4. The pit may be lined with. Total volume req = 10200+2400 = 12600 lit or 12. (b) Design and Installation. 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. g. The septic tank section is responsible for treating the wastewater naturally by separating the solid waste from the liquids. Sealed solid waste storage is an option if soil is. There is no intention to reuse the wastewater that is coming from the primary treatment unit. Purpose : To collect wastewater from dung channels and to facilitate removal of solid matters. A sullage pit keeps the wastewater in one place and encourages it to soak quickly into the ground. This initiative will slowly and steadily replenish the groundwater in the vicinity. Often called a soak away in the UK, a soak materials and economical design. 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. 402 Biological Wastewater Treatment: Principles, Modelling and Design Aerobic Influent + Aeration (100 kWh) Influent Effluent 10-20 kg COD Effluent 12-10 kg COD Biogas 40-45 m 3 (~ 70% CH 4) Heat loss 100 kg COD Sludge, 30-60 kg Sludge, 5 kg Anaerobic D Figure 16. 80 m(D) INDIVIDUAL HOUSEHOLD SOAK PIT • This type of Individual HH Soak Pits can be. These can be lined (like aA soak pit is a fairly old-fashioned method of dealing with household wastewater and sewage. In plants where a certain amount of whey is discharged, the pH of the effluent is reduced to below 6. 5 and 4 m deep3, but as a rule of thumb, never less than 2 m above the groundwaterIt is not designed to handle sewage or wastewater. In nature, everything operates in cycles. Certain design mandates are to be ensured for design of soak pits such as the depth of the soak pit should be between 1. 3 m and 7 numbers of rings are provided, the main aspect of this method is cost effective and easy to use. The soak pit, which is rea lly just a small pit (o ften 1 m3), should be b etween 1. Compared to a soak pit, the leach field might be somehow safer, but is considerably more sophisticated in its construction. If you have an issue to report relating to water (drinking water, wastewater, stormwater, and stock water races), please contact Council on 06 306 9611 or online via the ‘ Get it Sorted ’ page. (When calculating the size of a soak pit, the volume of water storage available for a rock-filled hole is 0. Then the surface water runs to the soak pit through an outlet pipe. This reduces the quantity of solids and also changes its composition to sludge, which builds up in the bottom of the tank. The soak pit shall be designed utilizing soakage and storage in accordance with 9. It offers a lot of potential in terms of establishing a long-term environmental sanitation system. ALL DIMENSIONS IN MILLIMETRES UNLESS OTHERWISE INDICATED 1. 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 length of the tank is usually 3 times the width. 5 and 9. This set of Civil Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Design of Septic Tanks”. Total Accumulated Sludge = 30 litres x 5 persons x 2 years = 300 Litres. The septic tank was designed to store the wastewater at the minimum period of 18 hours to 24 hours, it is called detention period. According to the IS CODE 2470 Part-2, 1985 Soak pits could be constructed of any size. to treat wastewater and to design a suitable loading rate for a site. CAPACITY OF SEPTIC TANK:-capable of storing sewage flow during detention period &extra volume of sludge for . The immersion well should be between 1. Your Ultimate Knowledge Hub. 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. The septic tank was designed to store the wastewater at the minimum period of 18 hours to 24 hours, it is called detention period. (= EPA 625/1-80-0 ). 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. The septic tanks are designed for foul sewage ( containing fecal matter and urine ). iii) Catch-pit. Septic Tank Septic tank is rectangular in plan and constructed with brick masonry over a concrete foundation. 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. V soak = 15 × 300/1000. Percolation testing for leach lines and horizontal seepage pits. A Soak Pit should be used for discharging pre. The area of the soak pit does not include the base. 1. Box 3: Design calculation of twin pit in sandy soil for a household of six. Very low on cost and a simple design for on. 0 m = 15 m 2. How a septic tank system works. Ujjain ’ s ‘ drainage system included soak-pits built of pot- tery-ring or pierced pots ’ ( Kirk : 32), and it has been supposed that ring-wells were used for the disposal of waste-Typically, the pit is at least 3 m deep and 1 to 1. 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. 5 Sewage - The liquid waste of a household or community including human excreta. AdvantagesS. 10. Reusing wastewater, collected rainwater or grey water becomes possible with a soak pit. The soak pit should be covered by the precast slab. The soak pit is an ordinary well of any shape with a minimum transverse dimension of 0. •The flow and characteristics of the wastewater that can be considered for design of septic tank is presented in the Table. The Absorption area of the soak pit could be 1 sqm to 1. 5 MB) Provides technical information about onsite wastewater treatment and disposal systems. 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. 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. covered or uncovered, and either empty or backfilled with. It is a hollow, circular/rectangular pit. Where the community lives near dams or river banks that frequently burst during the rainy season. 7 Surface Water - The run-off from precipitation and other water that flows over surface of. The wastewater generated in houses like water used for bathing, washing clothes and utensils is commonly disposed in this pit. It. Here the design of the soak pit as per. The scum, composed of waste that’s lighter than water, floats on top. 48 KLD greywater is produced per day. Distances for these onsite wastewater treatment components are given in feet to other site features unless otherwise stated (a few distances may be given in inches). Cesspit, cesspool and soak pit in some contexts are terms with various meanings: they are used to describe either an underground holding tank (sealed at the bottom) or a soak pit (not sealed at the bottom). Malik Enroll- 190/11 Roll no. 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. 900mm 250mm. 4. clay, hard packed or rocky soil is not appropriate. An anaerobic baffled reactor (ABR) is an improved Septic Tank with a series of baffles under which the grey-, black- or the industrial wastewater is forced to flow under and offer the baffles from the inlet to the outlet . septic tank, twin-pits for pour-flush toilets, biogas settler, anaerobic baffled reactor, etc. In this Video I will explain about soak pit | soak pit construction | soak pit for septic tank | soak pit for wastewater #SoakPit-----. Based on this the diameter of the soak pit is given as 1. The design, spacing and materials for manhole steps shall be approved by the Authority. This Appendix will explain how to design soak pits and infiltration trenches. well in Australia and known as a soak pit in India. 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. compartment is the soak away pit. What is an On-site Wastewater System? An On-site Wastewater Disposal System collects, treats and. A soak pit does not provide adequate treatment for raw wastewater and the pit will quickly clog. 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. The maximum depth for determining the allowable design volume of a tank shall be 60 inches. What is the purpose of a soaking pit. Fill the Boulders & Gravel around the ring. 38 times the volume of the hole. 15 There shall be no physical connection between a public or private potable water supply system and a sewer. 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. Intermediate. The soak pit should. 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). The immersion well, basically consisting of a single well (usually approximately 1 m3), should be between 1. inch of water to soak into the soil. Determine the Purpose: Decide whether the soak pit will be used for stormwater management or wastewater treatment. This is the area where the treated water from your septic tank is distributed. This residue is commonly classified as primary and secondary. The majority of the wastewater management system requires a soak pit for this partial treatment. Normally, the chambers are all of the same depth (between 1. 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. Topics covered in the orientation session include, but are not limited to the following: 1. 2 metres from a boundary. Domestic Wastewater Wastewater with a measured strength less than high strength wastewater, which is discharged fromSoakage Pit. , 2014 Read- Homemade septic Tank Design! Soak Pit Size. The putrescible and highly odorous effluent from the septic tank requires to be properly treated and disposed. Thus the two pits can be used alternately and perpetually. Soak pits or infiltration trenches that intercept the water table will fill rapidly and are unlikely to cope with large volumes of wastewater. Infiltration area (iA): The surface area required to infiltrate the amount of wastewater entering the pit. 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. 0. 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. Varieties include supa pits, mega pits or splay pits. . The size of the pits varies according to the amount of wastewater generated and the quality of the soil. The inputs and outputs of soak pits and cesspits are illustrated in Figure 3. INTRODUCTION The magic soak pit is an underground structure used to dispose the wastewater. 2. The soak away pit is of natural earth at the bottom which allows the wastewater to naturally drain the liquids down into the earth. Set pavers slightly higher than the gravel to keep the gravel in place. Septic tanks work by allowing waste to separate into three layers: solids, effluent and scum. Designing a complete layout. This urine stream contains about 80% of the N, 56% of the P and 63% of the K found in domestic wastewater [18]. Soak Pit Design. Keywords. For safety, an excavator (backhoe) is usually used to dig the pit to five-feet. SO. Learn how to dimension a wastewater pit optimally, including practical calculation examples. The design and sizing will vary. Percolation test waiver procedures. These can be lined (like a well) or unlined and filled with rocks. It helps in collecting and disposing of wastewater safely away from the house. Typically, the pit is at least 3m deep and around 1m in diameter. A soak pit or a soakaway is a closed porous chamber that is directly connected to a primary treatment unit of residential or commercial building. The 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. The effluent may be disposed of in a soak pit. 2. Wastewater. Table 1: Matrix to determine value of the sizing factor (fs) 9. occupants of premises on the design, installation and operation of septic tank systems. . 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. 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. 5/10/06 2 of 10 Water Works Design and Construction Sizing The following are intended to be general guidelines for sizing the most common types of storage tank configurations. The wastewater management systems were adaptable to the cultural and economic conditions of the society. 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. These are used for the discharge of domestic and industrial wastewater. Pre-settled effluent from a collection and storage/treatment or (semi-) centralized. Example - Design of Septic Tank for 20 Users Liquid capacity of the tank: @120lts per user = 0. the wastewater to pass through. 80 m. Soak pits are used for soils where. Soak pit are best suited to soils with good absorptive properties; clay, hard packed or rocky soils are not appropriate. The soak pits work with a simple process of filtration that helps in treating the wastewater and in. 1 This code gives recommendations for the design, layout, construction and maintenance of drains for waste water, surface water and subsoil. 4 meter cube [Since, 1000 liters = 1-meter cube of water] Step2:- Assume the liquid depth of the tank. Capacity testing and policy applicable to vertical seepage pits. Estimate of Soak Pit. If municipal drainage line exists in the area, the effluent is discharged to the drain. A Soak Pit does not provide adequate treatment for raw wastewater and the pit will clog. 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. 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. TREATMENT OF HOSPITAL WASTEWATER Name- Tabish. • Total Wastewater coming to Septic tank = 100*5*200*80/100 = 80000 lit/day. the twin-pit design was introduced and in this case when one pit is full, the excreta is diverted to the second pit. The soak pit should be. ABRs are robust and can treat a wide range of. , 2014Read- Homemade septic Tank Design! Soak Pit Size. DEWATS (Decentralized Wastewater Treatment System) is a wastewater treatment system that is both cost-effective and efficient, especially in poor nations. wastewatermanagement,toprotectpublichealthandtheenvironment. 4. To provide effective drainage for areas that flood. 5 and 9. Soak pits are used to collect water from stormwater systems and provide it with a place to sit until it can be treated by the city's wastewater treatment facility. A = Stabilization pond B = Soak away pit. Capacity of tank required = 10200/24 x 24 = 10200 lit. A biological wastewater treatment process by which biologically active sludge (concentrated biomass) is agitated and aerated with incoming wastewater. Design consideration of Soak Pit. A cesspit can be used for the temporary collection and storage of feces,. Key Words: Magic Soak Pit, Disposal, Unhygienic Condition Wastewater, Groundwater Recharge. Apart from this 24x7 customer support is our USP. In this article, What is Soak Pit, Meaning, Purpose, Need, Advantages and Disadvantages, Estimate of Soak Pit Excel, Quantity, Design, Construction Procedure, Health. Sewers should be laid at least 3. So soak pits are preferred where the soil is porous in nature. While dried feces and urine harvested. com for any support, inquiry or product-purchase related query. CAPACITY OF SEPTIC TANK:-capable of storing sewage flow during detention period &extra volume of sludge for . Advantages a Table of Contents Soak pit: Design Procedure of Soak Pit|Advantages and Function of Soak pit What is Soak pit? A soak pit is also known as the soak way is a covered porous walled chamber that allows water to slowly soak into the ground. A Soak Pit is a very low-cost and low-tech solution for discharging wastewater. 1. 1. Based on this the diameter. 5 is commonly applied to Upper Hutt City Council and Hutt City calculations, as being an acceptable factor of safety for soak pit designs in the Hutt Valley. Almost all the pit latrines and septic tanks in Cotonou have depths between 1. Where a soak pit is required, a building consent application with calculations for soak pit sizing must be approved by the building consent authority. Wastewater is made up of 99 percent water and about 1 percent.