7. Soak pits are appropriate technology for rural and suburban areas. 48 KLD greywater is produced per day. A = Stabilization pond B = Soak away pit. The wastewater may be from toilets only (sewage), or include sullage (wastewater from kitchens, laundries and bathrooms, also called ‘greywater’). Where N is the number of the user. Where N is the number of the user. The soak pit’s wastewater infiltration can be used to recharge the groundwater. The greywater that passes through the soak pit is filtered. Civix is a team of designers, engineers, and support staff who specialise in designing and installing soak pits. T he budget of soak pit is around 2000 rupees for each soak pit and constructed within two days with the help of two workers. 2. It essentially consists of a single. 1 This code gives recommendations for the design, layout, construction and maintenance of drains for waste water, surface water and subsoil. Explanation: Soak pit is a circular pit through which sewage is disposed in the soil. The immersion well should be between 1. 16 C = Open discharge or surface D = Drainage channel. Nonetheless, understanding the physical or functional aspects of these system constructions remains difficult when there is no. tSt2410(Partl)-1985 2. Soakaway Pit:- Means any pit or any other underground construction designed for seepage of the treated wastewater into the ground by infiltration or percolation. 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. If the pit shown in this sketch were receiving sewage and blackwater from a building we would call it a cesspool, not a drywell. 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. Unit Operations for Aerobic attached growth and aerobic suspended growth wastewater treatment processes are the. (An Unit Of Birama Construction) prepares your soak pit design that offers an economic opportunity for waste-water management. 2. 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. 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. 3 m and 7 numbers of rings are provided, the main aspect of this method is cost effective and easy to use. Thus the two pits can be used alternately and perpetually. without contaminating ground water where it is extracted. A soak hollow is one covered, porous-walled chamber that allows water to slowly soak into the ground. How to Design Wastewater Systems for Local Conditions in Develop-ing Countries This manual provides guidance in the design of wastewater systems in developing country settings. 1 Fate of carbon and energy in aerobic (above) and anaerobic (below) wastewater. Total Septic Tank Capacity = 2000+300 = 2300 Liters. 20. 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. It should be used for discharging pre-settled blackwater or greywater. Design Considerations of Soak Pit Design. Dry wells (also known as soakaway pits, soakwell, or soak pit), is one of the earliest models of a water runoff management system. 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. itself and the soak field. Detailed characterization data regarding. Wastewater composition refers to the actual amounts of physical, chemical and biological constituents present in wastewater. Opening a pit to expose the soil profile is ideal to allow. DEWATS (Decentralized Wastewater Treatment System) is a wastewater treatment system that is both cost-effective and efficient, especially in poor nations. lower part is constructed leaving some open joints to allow infiltration. and soak pits for onsite treatment technologies, it is vital to have a treatment system between the septic tank stage and soak pit in highly congested areas to avoid this condition (Forbis-Stokes et al. The scum, composed of waste that’s lighter than water, floats on top. 0. Technology and Program Design 6 Legislation and Standards for Urban Sanitation 11. the selection, approval, management and maintenance of onsite wastewater management systems which treat up to 5,000 litres (L)Air conditioning and pipework systems – wastewater removal 2 This guideline assumes a percolation rate of 10 L/day/m2 of soil surface area within the soakage pit or tunnel. It is commonly used in areas where the soil has good percolation rates, allowing for effective filtration and treatment of effluent. 5m to 4m. 5 and 4 m deep, and not less. Does not cover the design of soak pits with overflows discharging to outfalls. The size of the pits varies according to the amount of wastewater generated and the quality of the soil. In some areas, the pipes connect the septic tanks into soak pits. Intermediate. However,. A _____ is a chamber made of concrete, fiberglass, PVC or plastic, through which domestic wastewater, sewage flows for primary treatment. g. It is an underground pit, filled with stones which filter solids that get slowly digested by bacteria. 4. 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. 1. Hospital wastewater may contain various potential hazardous materials including, microbiological pathogens, radioactive. 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. 0 m × 3. Design Considerations The soak pit should be between 1. D. 2. com for any support, inquiry or product-purchase related query. Certain design mandates are to be ensured for design of soak pits such as the depth of the soak pit should be between 1. 10 Floating Plant Pond 158 D. Q is the rate of water supply. The area of the soak pit does not include the base. WASTEWATER (GREY WATER) PIPES: PIPE GRADIENT = PIPE DIAMETER. Gravel and stone beds are called infiltration trenches or stone swales when used for stormwater control. Take sludge settled down per person – 30 liters/year. The soak pit serves as a receiving container of the effluent water from the main treatment unit, Soak pit performs partial treatment of the wastewater coming out of the main treatment system. 48 KLD greywater is produced. It is called the detention period when the wastewater in the septic tank intends to store for at least 18 hours to 24 hours. 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. Then the surface water runs to the soak pit through an outlet pipe. The putrescible and highly odorous effluent from the septic tank requires to be properly treated and disposed. 20m(B) x 1. Numbers in bold-face are those more-widely accepted or most inquired by our readers. 5 and 4 m deep, and as a rule of thumb, never less than 2 m above the highest groundwater table. Soak Pit - Function, Types & Design. 5 m diam eter and depth of 3 m trench with 3. pit, mouth exposed at ground level. A soak pit is a covered, porous-walled chamber that allows water to slowly soak into the ground1. compartment is the soak away pit. 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. Set pavers slightly higher than the gravel to keep the gravel in place. Percolation testing for leach lines and horizontal seepage pits. The treated effluentJan 27, 2021 - Explore Iheks's board "SOAKAWAY" on Pinterest. The pit may be lined with stone, brick or concentrated blocks with dry and open joints. wastewater treatment systems. inch of water to soak into the soil. Suppose there is no need to reuse wastewater collected from stormwater, greywater, and black water. 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. Using a soak pit will help you cut down on the amount of contaminated water released into the environment. There are five pieces of information that must be considered to design a soak pit or infiltration trench: ` Key Information Needed for Soak Pit and Infiltration Trench 1. 1 Introducti on 50 4. Completion time: 30 minutes. August 23, 2022. The soak pit is an ordinary well of any shape with a minimum transverse dimension of 0. This is useful for absorbing small amounts of clean water such as the runoff from an outdoor shower or a swimming pool. Caustic Soda Treatment (Emerging Technology) Caustic Soda Treatment is a cost-effective chemical treatment for faecal sludge from pits and trenches. (b) Design and Installation. 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 wherever a. Maintenance Requirement: Periodic removal of screenings and cleaning. Percolation test waiver procedures. Loose brickbats are laid at the bottom to improve the soaking quality. Design Characteristics: BOD Total Suspended Solids Fecal Coliform : : : 170 370 mg/l 250 mg/l 5 x107 MPN/100ml. Flow of water is always downward. Using a soak pit will help you cut down on the amount of contaminated water released into the environment. 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. 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). MODIFIED SOAK PIT Total = 135 Liter IDEA OF MODIFIED SOAK PIT These soak Pits Are for ⒸAll Society Member Provide Two Soak Pit for Alternative Use Provide Bixal. at community level as a measure for management of the greywater generated. Sanitation_SoakPitDesign - Read online for free. Here are the steps to design a soak pit: Determine the size of the. The wastewater generated in houses like water used for bathing, washing clothes and utensils is commonly disposed in this pit. Also the faecal sludge needs to be correctly disposed and further treated (e. a) drainage tank b) pit latrine tank c) harvesting water tank d) septic tank View. A Soak Pit should be used for discharging pre. Adequacy. 6 of Clause E1 of the NZ Building Code to ensure that surface water is discharged without overflowing. 7 Surface Water - The run-off from precipitation and other water that flows over surface of. In areas where the ground water level below 4m a soak pit can be used. Soak pit drawing for diploma Civil 3rd year 5th semester@rajnishkumarofficialcivile9643 Video highlights soak pit drawing drawing of soak pit soak pit #diplo. The design, spacing and materials for manhole steps shall be approved by the Authority. 900mm 250mm. Which makes it a reasonable choice for water reaping. 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. 1. The various parts of the septic tank are properly designed as per the standard laid. 5 Sqm per head of the user. The volume of sewage settlement. Installation of soak pits is also recommended near hand-pumps, stand posts, etc. This Code applies to wastewater (containing sewage) generated by a single domestic household or by multi-dwelling residential, commercial, industrial or institutional facilities. 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. 5 and 4 m deep, and not less. . 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. The design of the community soak pit is according to the population of village. pvc sn16 unless noted otherwise. 1. of wastewater into the environment. tanks with soak pits. A cesspool is a pit or underground container that collects and stores untreated wastewater until it can be emptied and disposed of elsewhere. 4. 2. C cover with manhole is provided at the top of the tank. 6 m. Domestic Wastewater:- Means the effluent, including settleable materials (sludge) and scum discharged from water closets, ablutions, kitchens…etc, of houses and institutions. Design The design of a septic tank aims to: • produce a tank in which wastewater is contained for long enough for the maximum removal of suspended solids; • prevent suspended solids from being discharged with the effluent; • provide sufficient space for the sludge and scum to accumulate between desludging;Your design should: Contain wastewater long enough for maximum removal of suspended solids. These can be lined (like aA soak pit is a fairly old-fashioned method of dealing with household wastewater and sewage. R. 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. Determine the Purpose: Decide whether the soak pit will be used for stormwater management or wastewater treatment. Estimate of Soak Pit. 3. 2. A layer of sand and fine gravel is spread across the bottom to help disperse the flow. The separate collection of feces and urine without any flush water has many advantages, such as odor-free operation and pathogen reduction by drying. natural land, is built with a round shape with dry bricks or stones with free mortar together, where water can easily soak to the ground known as soak. Capacity of tank required = 80000/24*18 = 60000lit. 0. Topics covered in the orientation session include, but are not limited to the following: 1. Q = 80 litre/ day ; For intermittent water supply. Liquid waste is also called wastewater. 5. 1. 50 11 TABLES TABLE 1: Determining capacity of septic tank based on use conditions. These can be lined (like a well) or unlined and filled with rocks. 3. A Soak Pit should be used for discharging pre settled black water or grey water. In that case, soak pits can offer a cost-effective technique for partial treatment and a comparatively safe approach of discharging it to the. Soak pits can provide an economical opportunity for a partial treatment of wastewater or ash from a primary treatment (e. Containment (septic tank and soak pit): The septic tank is sealed and impermeable but the soak pit is permeableSoak Pit Design. Effective. 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 Considerations of Soak Pit Design. FREE SEPTIC TANK DESIGN DOWNLOAD. Also Read: Septic Tank - Features and Design. . Splash pit is likewise an extraordinary method of gathering and utilizing stormwater to re-energize and raise the groundwater table. Almost all the pit latrines and septic tanks in Cotonou have depths between 1. to treat wastewater and to design a suitable loading rate for a site. Many people prefer a rectangular type. It is extremely important that the soil be allowed to soak for a sufficiently long period of time to allow the soil to swell if accurate results are to be obtained. 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. Soak pit construction procedure. The wastewater generated in the house from the kitchen and […] A soak pit is frequently offered for such partial treatment. 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. According to the IS CODE 2470 Part-2, 1985 Soak pits could be constructed of any size. Summary of design criteria; (d) The location of and use of the ‘reserve area’;. The depth varies from 3-5m. 4 References 48 4 WASTEWATER RICHARACTESTICS 4. How to design a septic tank? All site survey results affect system design, from the installation depth of the tank to the required size of the drainage site. Let take @120 liters per user as i have told you to consider above. To detect the impact of soak pits on the environment, a survey was conducted by collecting Septic tank effluent fromdesign approaches detailed by D. txt) or read online for free. In nature, everything operates in cycles. The wastewater generated in the house from the kitchen and […] March 11, 2020. 5 to 2. The wastewater generated in the house from the kitchen and bathrooms has to be disposed of. Soak Pit Type – 2 Magic Pit Perforated Concrete rings can be used in this method. • an older style septic tank and soakage trench or soak hole system2. HKP Infrastructure Pvt. The depth of the soak pit varies between 120cm to 180cm. Compared to a soak pit, the leach field might be somehow safer, but is considerably more sophisticated in its construction. treatment processes, anaerobic suspended growth treatment reduction in biochemical oxygen demand, Waste Water Treatment process. Design Consideration of Soak Pit. , 2014; Yadouléton, 2015). wastewater. Grey water; Methods. The soak pit, which is rea lly just a small pit (o ften 1 m3), should be b etween 1. 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. • Solid products accumulate in the pit-action of time and temperature- degraded and pathogen. , 2014). The design of the community soak pit is according to the population of village. 1 FOR DETAILED SEPTIC TANK DESIGNThe “Soak Pit” or Soakage Pit or well is an area located slightly away from the septic tank. While the first standard for small septic. Public Fountains, Hand Pumps, Overhead WaterTanks, etc. The soak pit discharge clear and non-harmful water to the ground. All onsite wastewater systems need to dispose of the water used in your home. Appendix 3 - Design Calculations for Soak Pits and Infiltration Trenches – Tables and Equations Introduction to Low Cost Sanitation Participant Manual Appendix 3 A3 - 1…The soak away pit is of natural earth at the bottom which allows the wastewater to naturally drain the liquids down into the earth. It is a simple design consisting of a PVC pipe containing two valves and can be built using locally available materials. CAPACITY OF SEPTIC TANK:-capable of storing sewage flow during detention period &extra volume of sludge for . WA = 540 L / 50 L/m2 = 10. 5m above the ground water table. 5 and 4 m deep. The Waimakariri District Council has responsibility for the following functions: Urban stormwater. C. Table 1: Matrix to determine value of the sizing factor (fs) 9. Q = 120 litre/ day; For continuous water supply. 5 and 9. There is no intention to reuse the wastewater that is coming from the primary treatment unit. You can mix the kitchen wastewater with the soil before planting any plant or sapling. The pit may be lined with. 48 KLD greywater is produced per day. Design Considerations of Soak Pit 1. SO. A soak pit is a covered, porous-walled chamber that permits water to soak into the ground slowly. What is the wastewater from kitchen sinks called? a) Grey water b) Black water c) Yellow water d) Brown water. The effluent may be disposed of in a soak pit. 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. 1. REFER TO ANNEXES 5 AND 5. Soak Pit Construction / How to build a soakaway. Priority must be given to wastewater from the primary treatment unit, which should ensure stormwater is not gathered in the pit resulting in clogging of the pit. It contains the following information: Design tables for soak pits and infiltration trenches. The essential functions of a septic tank are: • To collect. The minimum capacity of the pit should accommodate all the wastewater produced during one washing or in one day, whichever figure is the greater. Septic tanks are a minimum of 2700 litres (650 gallons) for a 2 bedroom house. Modify or Operate a Small Wastewater Facility” shall remain covered under those permits. A soak pit is an underground structure designed to manage water drainage efficiently. Sometimes the effluent of centralized wastewater treatment units or other decentralized primary treated effluents is also soaked through soak pits. III. SOAK PIT. However, discharging effluent water into the environment after partial treatment through a soak pit is a safer option. This reduces the quantity of solids and also changes its composition to sludge, which builds up in the bottom of the tank. If the percolation rate is too high, the wastewater might drain into the. A tight tank is a sealed container. 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. Do not store it for longer than 48 hours as bacteria growth will start to affect the quality of the water. Part B. If the pit diameter exceeds 1. 5 and 4 m deep, but as a rule of thumb, never less than 2 m above the groundwater table. is a type of residential wastewater that is created during activities including bathing, laundry, clothes washing, and dishwashing. The immersion well, basically consisting of a single well (usually approximately 1 m3), should be between 1. coarse material. (= EPA 625/1-80-0 ). Capacity required for Sludge accumulation = 10 x 6x 40 = 2400 lit/ year. Plasticizers: SP-430 =0. the twin-pit design was introduced and in this case when one pit is full, the excreta is diverted to the second pit. DESIGN MANUAL: SEWAGE DISPOSAL SYSTEMS IN PRINCE GEORGE’S COUNTY . 80 m(D) INDIVIDUAL HOUSEHOLD SOAK PIT • This type of Individual HH Soak Pits can be. When infiltration from a soak-away pit is a problem due to low permeability of the soils, increasing the area of infiltration by introducing lateral subsurface drains also commonly known as French drains to the soak-away pit can be applied (Figure 3. Soak Pit Design. See full list on civiconcepts. 20. These guidelines include: The soak pit should be designed to manage a 10% Annual. 3 Disposal of sullage wastewater. The majority of the wastewater management system requires a soak pit for this partial treatment. Prevent suspended solids from being. A soak pit is an essential part of any home drainage. 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. Key Words: Magic Soak Pit, Disposal, Unhygienic Condition Wastewater, Groundwater Recharge. removed, physical and chemical contaminants removed. 1 Soak pit tank A soak pit is essentially a hole designed with the purpose of allowing wastewater to infiltrate into the ground. The length of the septic tank should be 2 to 4 times the width. 5m, there is an increased risk of collapse. A Soak Pit does not provide adequate treatment for raw wastewater and the pit will. Design Consideration of Soak Pit. 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. This page contains information about the district’s water supplies and sewer services and what you need to do to connect to those services. 2 Disposal Alternati ves 13 3. 5 and 4 m deep, but as a rule of thumb, never less than 2 m above the groundwater table. 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. 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 does not provide adequate treatment for raw wastewater and the pit will clog quickly. 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. The soak pit should be. The septic tank was designed to store the wastewater at the minimum period of 18 hours to 24 hours, it is called detention period. Based on this the diameter of the soak pit is given as 1. 6 cum. Sewage is a collection of waste water from domestic purposes or commercial purposes. April 20, 2021 by civilbull A soak pit is a covered, porous-walled chamber that permits water to soak into the ground slowly. Designing a complete layout. covered or uncovered, and either empty or backfilled with. The wastewater management systems were adaptable to the cultural and economic conditions of the society. Abstract. NYS Table 6: Seepage Pits / Soak Pits: Required Absoptive Area for Household Systems (Table body gives the required square feet of soakpit absorptive surface area). The basic functions and the need for a soak pit in wastewater management are briefly explained in the article. 1. The pit design allows action of aerobic microbes, turning excreta into compost within few months. g. 8 m2 WA =Wall Area DF = Daily Flow SIR = Soil infiltration rate (See table 1). The stones increase the surface area over which biological and chemical actions take place. A complete sewage treatment plant will need a septic tank, collecting all the waste from the house (grey and black water) and allowing solids to settle out before the liquid passes to the reed. A Soak Pit does not provide adequate treatment for raw wastewater and the pit will clog. The soak away pit is of natural earth at the bottom which allows the wastewater to naturally drain the liquids down into the earth. Designing a complete layout. The maximum depth for determining the allowable design volume of a tank shall be 60 inches. Installation of soak pits is also recommended near hand-pumps, stand posts, etc. During this time period, the sludge was decomposed by the biological action of anaerobic bacteria and the solid waste settled down as sludge. 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]). Because it may contain pathogens, nutrients and other harmful contaminants, wastewater needs treatment before it. Systems that carry a mixture of both domestic sewage and storm sewage are called combined sewers. Q = 80 litre/ day ; For intermittent water supply. They work by allowing bacteria, fungi and micro-organisms to breakdown, digest and clean the waste water to the point where it can be safely discharged. 50m from water abstraction points, boreholes, springs. 38 × 30 m 3 = 11. A Soak Pit does not provide adequate treatment for raw wastewater and the pit will clog quickly. The wastewater can easily soak on the ground. 6 of Clause E1 of the NZ Building Code to ensure that surface water is discharged without overflowing. It essentially consists of a single. B. 17/05/2018 · Design of septic tank & Soak pit. The sludge is pumped up by hand, collected in a container and taken away for disposal. During this time period, the sludge was decomposed by the biological action of anaerobic bacteria and the solid waste settled down as sludge. Design consideration of Soak Pit. Often called a soak away in the UK, a soak materials and economical design. , 2014 Read- Homemade septic Tank Design! Soak Pit Size. Soak Pit Design. Soak pits or infiltration trenches that intercept the water table will fill rapidly and are unlikely to cope with large volumes of wastewater. It also avoids bad odour and unsightliness in the environment. To recharge the groundwater bodies, the. There are five pieces of information that must be considered to design a soak pit or infiltration trench: ` Key Information Needed for Soak Pit and Infiltration Trench 1. Keywords. g. The sludge can safely be used as manure. 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. 2x1. The following applies to all septic tanks regardless of material. (E1 Surface Water) it is recommended that the design soakage rates have an appropriate factor of safety applied to the raw soakage rates recorded. Explanations of the equations used for soak pit and infiltration trench calculations. 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. Very low on cost and a simple design for on. If there is no intention or no need to reuse wastewater, collected stormwater or greywater, soak pits can offer a cost-efficient opportunity for a partial treatment of waste- grey- or stormwater from a primary treatment (e.