2 Filling the pit several times in quick succession whilst monitoring the rate of seepage, to represent soil moisture conditions typical of the site when the soakaway becomes operative. l f. Calculate: A sp (area of base of soak pit) = 5. These modular water storage cells have a high void ratio and are used for either attenuation or infiltration of stormwater in residential, commercial, industrial and agricultural applications. If you are author or own the copyright of this book, please report to us by using this DMCA report form. Alternatively you can use our Soakaway Design Service. 4 m long x 2. 5m = 19. 8m wide, 1. Design Considerations of Soak Pit: The following are some of the conditions that should be considered for the design of a soak pit. Septic tank section, plan, soak away system and plumbing details that includes a detailed view of method of fixing water gauge meter for domestic aise withing the cavity of boundary wall, septic tank plan. These will be used to calculate the pit volume and internal surface areas. Previous Post. Use a long-handled shovel to start digging where you want your well to go. In this episode of Two Storey Extension, Tony takes you through the process of Digging Soakaway Drains and Footings. Soak Away Pit Design. 2 Related concepts. If it is disposed of in. 750x750. Septic Tank Soakaway Design Guidea septic tank and soakaway kit that you or your builder. The design of the sanitary sewers and stormwater collection networks are based on the principles of hydraulics. These trial pits can be dug by hand, but tend to be excavated by mini-diggers ( CAT or JCB ). A trial excavation is required to confirm whether the ground is suitable at the required depth for a soakaway chamber. For example, 50m2 roof area requires a rubble filled soakaway of (50m 2 x(50/3000))/0. This means the top of the drainage cube should be at least 300mm under the ground level. An infiltration trench is a design variation in which the excavation is in the form of a long rectangular trench, often situated along the rear lot line away from the building foundation. Garden or driveway soakaways are usually much smaller than. 7-9 Seepage Pit Cross Section 236 7-10 Typical Mound Systems 240 7-11 Detailed Schematic of a Mound System 241 7-12 Proper Orientation of a Mound System on a Complex Slope 246. Tradition is just peer pressure from dead people. It describes the steps needed to protect receiving groundwater and the constraints these may place on soakaway design and construction. txt) or read online for free. Smaller crates, like 0. A soakaway chamber is generally used when there is a lack of space available for a drainage field, but the ground conditions are generally suitable for one. 6. Design Considerations. This is the case for domestic driveway or garden soakaways and larger commercial systems. 5m x 0. Fit the sump cover. This page includes describes some important construction details for soakaway pits, soakaway trenches and. The pit is then filled with water repeatedly and in a short. details a suggested design approach complete with worksheets and design charts to assist applicants to determine which stormwater soakage system should be adopted. In this way water is treated on site and not discharged into public system. Sanitary and rain drainage. WATER LEVEL PROPOSED CONSTRUCTION OF. Provided in fully editable. 5m deep. £1500 - £2000. 0 m × 3. 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. one to be used as chamber soakaway pit. Wrap your soakaway crate in the geotextile membrane, making sure the membrane covers any outward-facing surfaces, including the pipe entry point. Soakaway infiltration of stormwater runoff at site, neighbourhood and catchment scales has long been practised throughout the UK and Europe, and recharge studies have demonstrated their. 00. Description. The Septic Tank has now been superseded by the sewage treatment plant. 0m deep. (When calculating the size of a soak pit, the volume of water storage available for a rock-filled hole is 0. SIZING OF SOAKAWAY PIT Project : Site condition = Cultivated field with sand strata Soil type = Sandy Loam Infiltration capacity (fc) = 0. Soakaways have been the traditional way to dispose of stormwater from buildings and paved areas remote from a public sewer or watercourse. org. Visual Soakaway Design 4 includes AutoCAD drawings for two types of trench soakaway and the basic ring soakaway arrangement. Soakaway design. Mech - elect - plumb. Seepage Pits; A conventional septic tank performs roughly 45% of the sewage treatment or less at a private home served by a septic. Design Considerations. Excavated soakaway pit. a %%ustandard soakaway. Failures due to poor design and construction, and use of inappropriate anal cleansing material. Low Impact Development Design Guidance Manual Prepared for: Watershed Management Services Municipality of Anchorage Project Management and Engineering Department Technology and Program Design 6 Legislation and Standards for Urban Sanitation 11. area A. 12 no. * Clay is not suitable for soak pits or trenches since it is difficult for the water to move into. The soak pits collectThe key elements of the Part H rules are that the soakaway must be 5 meters from a building or road. The required size is therefore determined by the amount of water used during. Alternatively you can use our Soakaway Design Service. £2. 3 to 1 m wide and 1 to 3m long. The waste water from the biodigester is us. 7). Sizes: 10 x 10 x10ft and 6 x 6 x 6ft. rebate for conc. Excavating a trial pit of sufficient size to represent a section of the design soakaway. WA = DF / SIR e. 3. Soakaway Pit:- Means any pit or any other underground construction designed for seepage of the treated wastewater into the ground by infiltration or percolation. C. Septic Tank Soakaway Design Guide. 5m x 0. Concrete soakaway rings used in a surface water. pvc pipe. 5 Sqm per head of the user. See more ideas about septic tank design, septic tank, sewage system. 15. 8m 3 . Design Procedure of soak pit. A minimum of three shall be bored or dug across the test area. . ) So: V stor = 0. Soak Pit – Need and Functions. 3 Pit sizing procedure 3. ADVERTISEMENT. 3 Examining site data to ensure. A test pit was excavated to the invert level of the proposed infiltration structure. A team of three certified drainlayers with many years of local experience. Download Soak-away Pit Design. the soakaway. 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. 99. 4 – Time divided by 4 = 120min/4 = 30mins. 5 External links. Calculate: A sp (area of base of soak pit) = 5. The depth of the pit should be 30cm lower than the depth of the soakaway once installed. Flat roof 3m x 6. This replicates soil moisture conditions typical of the site when the soakaway becomes operational. 4. 100. This is done by conducting a. C. Standard regulations states that for any house up to and including 3 bedrooms, the minimum size sewage system that can be installed is for 5 persons, with one extra person added for each extra bedroom. 588m3 Outflow from soakaway O O = as50 x f x D = Internal surface area of soakaway pit to 50%. Fill with water to depth of 300mm. Testing to BRE365 standards involves the following: First, a trial pit is excavated. Larger capacities are the best fit for a two-compartment tank. Author: Abdul Hayyi bin Awang. 2 – Hole filled with water. This video is about How To Build A SoakawayBRE 365 Testing. Step 1- Excavated earth inverted level from natural ground level Upto 3800 mm. for 10 min storm duration, M10-10min = 12. Herringbone. 4. In some cases for small soakaways it may be possible to dig the pit close to vertical and install the geotextile and fill before the pit walls collapse. To work out what the approximate size soakaway is required for your property. It allows the effluent to percolate into the surrounding soil, where it is treated naturally through biological processes. Difficult, unusual or larger project with complex pipework, difficult access, deep excavation through hardened materials (concrete, garden walls etc), disposal of waste material and reinforced materials. Septic tank and its design, how to maintain septic tank, simple way to design septic design in construction. A Soak Pit, also known as a Soakage Pit or Leach Pit, is an underground structure designed to collect and absorb excess water or wastewater into the surrounding soil. Sanitary and rain drainage. %%ucover slab for soakaway chamber %%uplan of soakaway %%usection on chamber ring %%ustandard soakaway %%uplan at roof level %%usection a-a. High Strength Security Fence. 7mm = 0. 2. DESIGN MANUAL: SEWAGE DISPOSAL SYSTEMS IN PRINCE GEORGE’S COUNTY . Type: PDF. waterjet floor design . . 1. Determine a suitable size and number of pits. pdf), Text File (. Septic tank design // soak pit design. An absorption pit, also known as a soakaway or infiltration trench, is a subsurface structure designed to manage stormwater runoff. 46 KB. 0m deep. 2. The design in this document has a vault size 80 x 80 x 80 centimetres, which is approximately 500 litres (0. Steps: To build a basic stand-alone soakaway, dig a pit in your soft turf no less than 1m2 and 1. Soak-away pit design for residential, based on Manual Saliran Mesra Alam (MASMA) 1st. 5 KG/CM for Manholes/Inspection chambers TABLE 1 SEPTIC TANK SIZES No. This article and its tables explain how to determine the size and design of a septic leachfield or soakaway bed or drainfield. Trench Soakaway Applications. ) Design Considerations: (a) Sufficiently large to provide a minimum capacity for 3 days' storage of wastewater, and to hold all the sludge likely to accumulate between desludging. 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. They are designed to ensure aerobic contact. Soakaways are traditionally square or circular pits filled with hardcore and are suitable in good draining ground such as sand or chalk. It is a hole completely filled with irregularly sized and shaped rocks. These can be: Aquasell crates. It should behow to construct a soakaway pitdo you construct a soakaway pit?What digger do you need?How easy is it to. the soakaway. Project : Site condition = Cultivated field with sand strata Soil type = Sandy Loam Infiltration capacity. There are all details about the Septic Tank, Plan, Cros Section, Foundation, levels, manhole covers etc, So We hope this Septic Tank details also will be useful for you. The insides of the excavation can become smeared, particularly by mechanical diggers building a soakaway in clay soils. The soak pit is an ordinary well of any shape with a minimum transverse dimension of 0. The soak pit may be of any suitable shape preferably circular. It includes design guidance for. 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. 10 m and 1 m depth below the inverted level of the inlet tube. Storage volume with . Our standard Ellipse 1 Cubic Metre Soakaway Set measures 1430mm (L) x 800mm (W) x 860mm (D), but don't forget that your hole needs to be large enough to allow for the sand base, side fill and backfill. We can offer bespoke soakaway designs completed in accordance with BRE 365, delivered in just 2 working days. Wastewater flows into the tank at one end and leaves it at. Animation Tutorials. (Only anaerobic bacteria will remain active). 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. ) Filling the pit three times in quick succession whilst monitoring the rate of seepage, to represent soil moisture conditions typical of the site when the soakaway becomes operative. 0m in each direction is appropriate for buildability. 38 × 30 m 3 = 11. 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. Unlike water wells that Dry wells (also known as soakaway pits, soakwell, or soak pit), is one of the earliest models of a water runoff management system. Purpose : To collect and convey wastewater to the inlet of the catch-pit. Submit Search . The first step in designing a soak pit is to determine the soakage rate of the natural ground. How to connect into the Sump Pit. £3000+. This membrane allows permeation of the water at the same time as preventing any thicker consistency, such as soil, from washing through. xls), PDF File (. 9 Pour Flush Latrine with Septic Tank and Soakaway 85 10 Community Toilet Block 87 11 A Vacutug 89 12 Small Bore Sewerage 94. Ignoring the influence of spatial effect, the foundation pit support is regarded as a plane problem only, and the traditional Rankine or Coulomb earth pressure theory can be used for analysis and design, which certainly will result in conservative results. Related products. Pea gravel could block the sump pump. Fill the soakaway hole with gravel or rubble up to the point that the layer is about 2cm away from the surface of the hole. Minimum soakaway drainage field distances. A french drain. 3. In other words, cesspools provide temporary. 1500 dia soakaways. and perimeter P. Capacity testing and policy applicable to vertical seepage pits. 2. This Standard gives design guidance on how soakaways shall be incorporated into systems used to treat and store road runoff prior to discharging to ground. g. Soak pit construction procedure. . 11, the water quality storage requirements for the site should be reduced based on the use of soakaway pits. Generally, a septic tank is constructed with 23 cm thick brick or RCC walls and a foundation floor of cement concrete 1:2:4 having a thickness of 15 cm. There are a variety of design and installation options for cisterns. T his update follow ed the D ecem ber 1992 issue of the N ational R ivers A uthority A quifer P rotection P olicy which superseded the. 3. This is useful for absorbing small amounts of clean water such as the runoff from an outdoor shower or a swimming pool. The two determining factors for soakaway success are the size of the area (or volume of water) to be drained and the percolation rate of the soil/sub-soil (or, in some sites, the depth to the water table). Step- One. The minimum capacity of the pit should accommodate all the wastewater produced during one washing or in one day, whichever figure is. Soakaway pits are designed to gather stormwater from your downspouts and temporarily hold it until it can be absorbed by the ground. This pit is then filled with water repeatedly, and in a short space of time. txt) or read online for free. SOAKAWAY DESIGN Soakaways are seen to be the preferred method for stormwater drainage for areas up to 100 sq m. Make a lid for the hole. Watch how we constructed a soak away for a bio digester to last longer than usual. WSD 6. 2 Filling the pit several times in quick succession whilst monitoring the rate of seepage, to represent soil moisture conditions typical of the site when the soakaway becomes operative. 80 = 16mmThen all you need to do is simple decide on the type of soakaway crate you require, and divide 1m3 by the volume of each individual crate. This is achieved by: 1 Excavating a trial pit of sufficient size to represent a section of the design soakaway. 12C. BoQ Septic Tank & Soakage Pit for Public Toilets (2 Stalls) Sr. A septic tank may be more suitable for properties with high water usage, while a soakaway may be more suitable for properties with low water usage. Today I'm going to show you Exactly how to build a strong Soakaway pit or leachpit or soakpitIs a flooding Bathroom dangerous?Yes If the Bathroom over floods. A soakaway is a hole dug into the ground that is filled with coarse stone and rubble or plastic crates. T he design and construction of soakaw ay system s outlined in "H ousing D esign Guide" published in 1976 by the Kent P lanning O fficers and "T he D esign and C onstruction of Estate R oads in the C ounty of Kent" published in 1975 and subsequently amended were both superseded by Technical Memorandum M86/1. 8m (I. with base area A. 5. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. To design a trench soakaway, follow these steps: Site investigation: Conduct a site investigation to gather information on soil type. Soakaway pits/trenches are however necessary. a suitable design in upvc is illustrated. Digest. This is the case for domestic driveway or garden soakaways and larger commercial systems. Deep Bore Soakaways are special types of soakaway which use a lined borehole in order to infiltrate runoff water to deep strata. Design Considerations: (a) Soakaway pit should be sufficiently large to avoid flooding and overflow. site of the soakaway. I have a side border that needs excess water diverted. Materials such as the crate, membrane, pipe, gully,. WA = DF / SIR. Day 5: Block work starts. 90 m and a minimum depth of 1. £2. i light duty cover from septic tank outlet 225mm blockwork wall soakaway pit plan r1250 225 100 500-800 8000 gravel fill max. slab. This is achieved by: 1 Excavating a trial pit of sufficient size to represent a section of the design soakaway. PRESIDENT'S OFFICE, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENTS, SEPTIC & SOAKAWAY PIT. . level to make sure you have at least 1/8 in. 750x750. Four Burner Stove. Water supply = 200 lits/day. In any event, holding tanks capacity must provide a minimum of three days storage with the condition that the. 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. Health Review Section. 2. This includes both the cost of materials for building Soakaway tanks as well as labour charges. 39 M5-30 = 20mm x Z1 M5-30 = 20mm x 0. Storage volume with . 1. SHOVEL FINISHING ON PIPE. 2 m (depth of water in the soakaway pit) W = 3. The table below shows the typical amount of trench required for the number of people in a house depending on the. Digested sludge gradually builds up in the tank and requires eventual removal by tanker. Safety factors and maintenance: Apply appropriate safety factors and design considerations to ensure the soakaway will function effectively over its intended lifespan. %%ucover slab for soakaway chamber %%uplan of soakaway %%usection on chamber ring %%ustandard soakaway %%uplan at roof level %%usection a-a. 5m from any boundary. SOAK AWAY PIT PLAN. 040) Example 1. Fill with large chunky clean rubble or 20mm gravel to about 5" from the top. However, soakaways any deeper than around 3. Residential Design Flow Rates per Bedroom (gallons per day, gpd)1 1 bedroom 150 2 bedrooms 280 3 bedrooms 390 4 bedrooms 470 5 bedrooms 550 6 bedrooms 630 1 An unfinished basement is considered two (2) additional bedrooms. Catch pits need regular maintenance to ensure optimum functionality. 7KB. of users All wastes TABLE 2 SOAKAGE PIT SIZES TYPE B 5 85 75 All wastes No. (194. The design method for sizing a soakaway is based upon the 2 decide on a construction type (eg filled pit in square, equation of volumes: circular or trench form, or concrete ring units with I–O= S granular surround). It is basically a pit in the ground into which flows rainwater drainage. Soak Pit Design. (When calculating the size of a soak pit, the volume of water storage available for a rock-filled hole is 0. The material used for the pit wall is sometimes perforated to allow wastewater to seep in from the sides. So here are the Typical Details of Septic Tank and Soakaway form the dwgnet. It should have vertical sides trimmed square and, if necessary. Percolation testing for leach lines and horizontal seepage pits. 5 and 4 m deep, but as a rule of thumb, never how to construct a soakaway pitdo you construct a soakaway pit?What digger do you need?How easy is it to. n cross-sectional free area of existing soakaway a P50 internal surface area of soakaway pit up to 50% maximum filling depth a S50 internal surface area of soakaway pit sides up to 50% effective. 2. Stephen L Garvin. Get your septic tank or treatment plant emptied - ok, so this might be the only easy solution, but it might just do the job. Septic Tank Soakaway Design Guide. A drywell, also known as a soakaway or soak pit in the UK or soakwell in Australia, is an underground drainage structure, traditionally filled with gravel, larger stones, or broken rubble, for collecting rainwater from roofs, paved or concreted areas. (Septic tanks are normally not required for poultry farms because dry muck-out at poultry farms can achieve very high levels of solids removal. 0m wide core of terram wrapped storm cell baskets. 8m long, 1. Many peoples are asking details about the Septic Tank and Soakaway pits. Soakaways Design Example for BRE Digest 365 If the area of your development being drained by a soakaway exceeds 100m 2 it must be designed in accordance with BRE Digest 365 to ensure that it will function correctly. 5 to 3 yrs. Soakaway Design Spreadsheet. 1 Shares. Pit/well of this type is to first store immediate stormwater run-off and then slowly dissipate it through infiltration into surrounding soil. Dig out enough soil to create a hole at least as deep as the height of the 55-gallon drum plus any planned dirt covering for grass. Wasa guidelines for design of water and wastewater systems - Download as a PDF or view online for free. The fill should be single sized gravel or similar material and the void ratio affects the storage volume of the soakaway so design values must be carefully chosen. It was based upon 20 years' experience in the design and construction of soakaw ay system s in K ent. Also, if the soakaway is to be installed as part of a new build development or extension then it must be marked on the building plans. 2. SOAK-AWAY PIT DESIGN CONTRACTOR relating to this projcet. These documents were first produced by FHI 360 and HCWH under funding provided by the CDC to support and inform proper management of health care waste. This is often useful where the upper layers of soil are contaminated or where a good infiltration medium such as a gravel layer is overlain by poorly infiltrating clays. 0 m × 3. Often the soakaway is placed away from the flooding area and a pipe connects the area to the soakaway in the form of a gutter or drain. 78m3; Using 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. Common soakaway designs include trenches, pits, and modular systems made from various materials like concrete, plastic, or stone. 3 See also. It should have at least a cross-section dimension of 0. Failures due to poor design and construction, and use of inappropriate anal cleansing material. A soak-pit is a closed porous chamber that is directly. In the past when a septic tank soakaway was constructed, a shingle or gravel bed would be put down first. Type: PDF. The Fill Material used for a soakaway pit or infiltration trench has a big impact on the performance of the soakaway and in optimizing the design. This new edition describes the design and construction procedures for soakaways, and explains how to calculate rainfall design values and soil infiltration rates. Mech - elect - plumb. Soakaway crates can be used to create a large storage volume or deep bore soakaways can be installed to. Almost all the pit latrines and septic tanks in Cotonou have depths between 1. Calculate the design width of the soakaway: Volume equation I - O = S Inflow to soakaway I I = A x R = Impermeable surface area of development x M10-D min rainfall e. Storage soakaway pits 2 m deep are to be used to dispose of rainwater from a roof of dimensions 10 m 8 m. Table 1. 8 m2 WA =Wall Area DF = Daily Flow SIR = Soil infiltration rate (See table 1). THE SOAKAWAY SYSTEM. The Perspex tube was again used to conduct the test onAlso Watch My Other Videos Link is Given Below: Videos are available in English । विडियोज़ हिन्दी में भी दिए गए हैं ।(video related to. A Dry Well (which can also be called a Seepage Pit) is an underground storage facility that temporarily stores stormwater runoff. 1. 5m deep in a lower part of your garden and preferably at the bottom of a slope. DG 365. The soak pit shall comprise either a rock filled hole or a lined chamber both of these options shall be enclosedThis video is about Soakaway DeignSoakaway pit: A soakaway pit, also known as a soakaway, leach pit or absorption pit, is a covered, porous-walled chamber that allows water to slowly soak into the ground. 1 Soakaway Pit. 1 load of soft sand = 18,000. 25m3 of water, so 1m3 divided by 0. Author: Abdul Hayyi bin Awang. publications, aiding designers to support planning and and paved areas, soakaways are used remotely from a public. In this guide, we will look at what a soakaway is and how it relates to a septic tank. how to build a soakaway - how to build a soakawayvideo will show you just how easy it is to build a soak. 46 KB. pdf), Text File (. The inflow will discharge through a porous feeder pipe originating from a collection chamber to which. The depth from the bottom of the soakaway pit to the estimated seasonally high water table should be greater than or equal to 1 metre. A trial excavation is required to confirm whether the ground is suitable at the required depth for a soakaway chamber. Often incorrectly called soakaways, a drainage field is much more than just a soakaway. This is achieved by: 1 Excavating a trial pit of sufficient size to represent a section of the design soakaway. SLAUGHTER HOUSE. This is achieved by: 1 Excavating a trial pit of sufficient size to represent a section of the design soakaway. "Overall depths of excavation will be typically 1. A drainage field (or soakaway system) is made up of a series of perforated/slotted. Sokoine Building, P. 2. REQUIRED ABSORPTION AREA SQUARE METERS PER BEDROOM FOR BOTTOM ABSORPTION TRENCHES OR SIDE WALL FOR. manhole cover 150mm RC slab reinforced with 12mm bars spaced SOAK AWAY PIT AT MAKERE. The absorption area of the soak. waterjet floor design . See moreThis is the ultimate guide to soakaway design. Download pdf PREMIUM - 194. Our products can be used for infiltration, as a soakaway and as part of blue roof systems. B. 25m deep to allow for capping off. 38 × 30 m 3 = 11. BOX 1923, 41185 DODOMA Soak Pit – Need and Functions. 1: Septic tank calculation tool (Excel document) 5 Footrest and drophole design 6 Checklist for concrete quality 7 Design summary for VIP latrines and UDDT toilets 8 Design considerations for difficult conditions1. 26 and certain BC areas have taken it to heart, as we have found out to. So here are the Typical Details of Septic Tank and Soakaway form the dwgnet. We can offer bespoke soakaway designs completed in accordance with BRE 365, delivered in just 2 working days. Block strength not less than 5 KG/CM for Soakpit and 3. Septic tanks are a minimum of 2700 litres (650 gallons) for a 2 bedroom house. 100mm dia. Step 1. There are the following considerations for the design of a soak-pit such as; It should be between 1. T his S oakaw ay D esign G uide has been issued in July 2000 generally to update the M 86/1 docum ent. Soak Pit Construction and Design Manual. Surface water soakaway drainage crates that fill a pit dug to allow rainwater to soak away. 5 m3), which may be adequate for a five person household for twelve months. Dig a hole in the ground at the planned location of the dry well. 1–3 At present, more and more scholars and engineers pay attention to the research on. com. Covered by our full. Soakaway Design at (For guidance only) Total area to be drained. If this is not known, a depth of around 1. It helps prevent surface flooding, groundwater contamination, and waterlogging by allowing water to percolate naturally into the ground. Soakaway capacity to hold maximum daily rainfall (taken as 40mm) Storage depth minimum 1. WA = 540 L / 50 L/m2 = 10.