DON'T install a soakaway in heavy clay soil, the water cannot drain through. This should give you a total impermeable area in. Whether you are looking for a simple solution. 00. £433. This pack contains the heavy duty SS500160HD Silt Trap with Catchpit and Filter. 0on't forget the arrows on the cells should face the opposite way to the arrows on the base plates. Code GEOTEX; From 5 reviews £160. Note that the intake of the pump sits at least 100mm above the base of the sump so that it isn't drawing in any silt or detritus that may have found its way into the system. Drainage. Some items have a Pallet charge. They catch any mud, silt or dirt particles that are washed into the drain from the gutters, channel drains or land drains. 2. The dimensions of the complete soakaway are 1200mm (L) x 1200mm (W) x 690mm (D) Rainsmart 65 Tonne soakaway crates have a void ratio of 95% - this is the amount of free space within the crate structure that can be used for rainwater storage. The SS500160HD Sentinel Silt Trap is a 450mm diameter chamber with catchpit and filter, designed to be put in line in front of a soakaway This silt trap has a depth of 2000mm and features one 160mm inlet and one 160mm outlet. Each of our silt traps has an integral silt bucket that sits just below the inlet pipe. Country. Guidance Notes: The performance of a soakaway is dependant on the porosity/ infiltration rate of the surrounding ground. . 69 £4. 5m deep and comes with 3x 110mm connections. Permeable Paving Cells. Free next day delivery available for orders over £1000. 00. Consider a pre-filter. BT Quadbox Duct Access Chamber Sections & Covers. We offer a range of silt traps, flow control units and adaptors are also available to complete the system. Our fantastic range of drainage supplies includes products designed to support above and below ground applications. Flow Controls - Orifice Chambers. 62 Save 20%. Buy Now. 8m 3 . Dear All, I am trying to resolve an issue with an existing soakway in the front garden at my residential property in the UK. 14 Save 20%. This fitting is usually used in conjunction with our GULLY300 Yard Gully. 4. Silt Bucket for use with our 300mm x 600mm Yard Gully. Marley UG61 Silt Trap Inlet Filter. 33 £119. £433. Rain Bloc 60 Tonne Soakaway and Attenuation Set - 0. Marshalls Civils & Drainage has developed a range of Offsite Solutions catchpit and silt trap manholes so why spend days constructing an in-situ a catchpit or silt trap manhole on site when one-piece chambers are available and can be installed within hours, not days!. Aqua Storm 65T Soakaway Crates 1000 x 1000 x 400mm Each crate has a capacity of approx. The primary difference between the different types of silt. The SS300110ER2 SiltGuard Silt Trap is a 300mm diameter chamber with a catchpit and filter, designed to be put in line in front of a soakaway This silt trap has a depth of 965mm and features two 110mm inlets and two 110mm outlets. 96 £541. Code SS300110LID. silt traps etc; concrete chambers; These provide a means of jetting the drain pipe. Our robust, chemically resistant Polypropylene and Polyethylene silt traps are available in a in a range of depths and pipe sizes for your soakaway and attenuation requirements. For installing drainage systems from inspection chambers, catch pits, silt management and flow control chambers we at Turtle are here to help. 54 £103. Typical silt trap 4 Figure 24 43 Percolation test for designing a soakaway system 4 Figure 25 44 Percolation test for designing a soakaway system - worked example 4 Figure 26 45 Guidance on soakaway for single house development 4 13 46 Volumetric data per linear metre for one cell wide trench configuration 4 14 46 450mm diameter catch pit/silt trap. Wastewater collected from canteen kitchens， including that from basins， sinks and floor drains， should be discharged into foul sewers via grease traps capable of providing at least 20 minutes retention during peak flow. 00. Soakaway Rainwater, which has been collected from impermeable surfaces, is directed to the crate structure via a silt trap chamber. For best practice, we always recommend that a pre-filter such as our Sentinel Silt Trap is used in conjunction with any modular soakaway system. All soakaways must be sited at least 5m from any building or road and preferably at least 2. Idealised wet-well or sump and pump. Item #: CLAYTRAPLINER Clay Trap, Liner Bag 6 Pk . 22 £67. Aqua Storm 65T Soakaway Crates 1000 x 1000 x 400mm Each crate has a capacity of approx. The soakaway must not be in an area of unstable ground or where the lowest point of the soakaway meets the water table at any point of the year. Silt Sentinel 500 series is a heavy duty silt trap with the option of a removable filter basket that sits under the inlet that will catch the silt in the flow. 55 ex VAT. For example, 50m2 roof area requires a rubble filled soakaway of (50m 2 x(50/3000))/0. What are Silt Traps? Silt traps for drainage are basin like devices placed upstream from a soakaway crate or sewer system. Geotextile Membrane - 4. For embankments between ten (10) and. The crate should be wrapped with the Geotextile Filtration Membrane provided. 5 Buffer strip/headland options 41 6. 36 £518. Silt Traps Designed to assist in a SUDS system to provide a solution to the ingress and removal of silt and sand from attenuation and soakaway systems by installing upstream of the installed tank. Code 90004M3K; £433. If connection is to be to a combined (foul and surface water) sewer then a trapped gulley is required. These traps will prevent 99% of all sediment from entering the drainage and storage system. Shop our wide range of drainage at warehouse prices from quality brands. Code STM02M3; £247. Add to Compare. Rainsmart Ellipse Soakaway Set Assembled with Silt Trap & Lid 1 Cubic Metre . This will prevent soil & silt from entering the crate which can reduce the rate of infiltration. For best practice, we always recommend that a pre-filter such as our Sentinel Silt Trap is used in conjunction with any modular soakaway system. 09. PBSL Group give a brief video of their inline silt trap or sediment trap, ideal for installation with soakaways. Empty the filter on a regular basis, you will be surprised at how much silt it retains. Silt Trap (3) Water Storage (7) Size. Inspection Chamber Set with Square Cover - 450mm Diameter. A silt trap is a method of preventing silt from entering and damaging a soakaway, attenuation or sewer system. As with other silt. For soakaway purposes the crate is wrapped in a geotextile material which is permeable, but protects the system from debris, and allows the water to slowly release back into the ground through infiltration. 110mm Drainage. The RAINBOX® Core system is designed for use in landscaped or trafficked areas (with a Gross Vehicle Weight of 40 tons), and can be installed in soakaway (infiltration) or storage (attenuation) applications for surface and storm water management. Silt Traps & Catchpits; Flow Control Chambers - Orifice Chambers - Vortex Flow Control Units* (orifice flow restrictor) We also offer a diverse range of Soakaway Crates for your convenience. These traps are installed inline in the 110mm drainage pipe that feeds into the soakaway. Join. Soakaway SiltGuard Silt Trap C/W Catchpit and Filter with Lid - 600mm Deep x 300mm Diameter. VAT Add to Basket . Standard (24 - 40 Tonne) Heavy (65 Tonne) Soakaways - Large Volumes (5 - 50 Cubic Metres) Standard (24 - 40 Tonne) Heavy (65 Tonne) Inspection & Cleaning . 00. 71 £515. 00 Incl Tax: £303. 2. Twinwall Utility Duct. 4. DON'T install a soakaway in heavy clay soil, the water cannot drain through. and install silt traps in appropriate locations in the pipe run. Both advanced and basic are available with All silt traps have the same purpose — to keep a soakaway system free from silt and sediment. Usually the easiest way to install the inlet drainage pipe is to simply lay it over the top of the soakaway tank and. Silt Sentinel Silt Traps; Silt Sentinel SILTBLOK; Inspection Channels; Plot Attenuation. Guides & Tips. Similarly, silt traps must be regularly inspected and cleaned out for the optimum free flow of water within the soakaway crate. (0) $329. All soakaways must be sited at least 5m from any building or road and preferably at least 2. The assembly of this set really is a quick and easy. For instance, a septic tank soakaway can become blocked: As a result of dip pipe or baffle issues in the septic tank. 91 £193. As discussed before, the main concern when fitting a soakaway drain is the system being filled with debris, silt and dirt. For best practices, a silt trap is always recommended as a pre-filter, emptying the filter on a regular basis will maintain the efficiency of the soakaway and greatly increase its lifespan. Drainage Separators & Interceptors. 84. Drainage Separators & Interceptors. Please. 2 reviews. 2-3 daysThe silt trap needed depends on the size of your soakaway. Inspection chambers are best suited to installations where workers will only ever need access to carry out CCTV drain surveys, drain rodding and water jetting to inspect and clean the pipework without having to physically enter the chamber. ON BACK ORDER - Please contact us for availability and alternatives. They are available in a range of sizes and can be fitted in various ways depending on your specific requirements, our most popular size is 320mm Ø Hydrocell 300 silt trap 640mm high. This is where stormwater is fed into the soakaway structure where it is held for long periods, allowing the water to slowly infiltrate into the surrounding soil, removing the need for stormwater drains and at the same time recharging the natural levels of groundwater. #2. Spend another £1500 to pay over time with. Product Code: PTE770; Availability: In Stock; £253. Simple shape ensures the removal of. 80 ex VAT. Home. Does anyone have any experience installing the soakaway crates? The recommendation is to fit a silt trap. The soakaway should then be placed in the hole with the cut holes in the soakaway facing away from the foundations of the building. all drainage pipelines are to be. The Silt Guard 300 Series is designed for installation upstream of medium to large volume, cellular/crate-attenuation systems, ponds, swales and irrigation systems. Standard (24 - 40 Tonne) Heavy (65 Tonne) Soakaway Crates - Shallow . Our robust, chemically resistant Polypropylene and Polyethylene silt traps are available in a in a range of depths and pipe sizes for your soakaway and attenuation requirements. We can also assist with projects including installation of grease traps, check out our GT Grease Traps, Jumbo and FOGi products in the Fats, Oils and Grease (FOGs) Management section. For best practice, we always recommend that a pre-filter such as our Sentinel Silt Trap is used in conjunction with any modular soakaway system. For best practice, we always recommend that a pre-filter such as our Sentinel Silt Trap is used in conjunction with any modular soakaway system. Code 90004M3F. Silt Traps. 200L : 5no Crates = 1 CUBIC METREThis kit is suitable for surface area drainage of up to 50m2. The Silt Guard SS300110 model is ideal for installation upstream of smaller volume, cellular/crate – attenuation systems, significantly improving the water quality going into the system, and thus supporting the longevity and. 2. • Silt trap to be provided before soakaway. Quick View. These systems are designed to collect and remove surface water, either by emptying it into the sewer. The insides of the excavation can become smeared, particularly by mechanical diggers building a soakaway in clay soils. Product Description. This silt traps filter out sediment to help prevent the soakaway silting up thus ensuring longevity and an. The first method is to dig up the soakaway, remove all the pipes and crates and re-install a new system. The silt sentinel is manufactured from a high strength polyethylene twinwall, which makes it very strong and robust and. 38 £26. 68. Soakaway Depth Soakaway & Geotextiles Above Ground Drainage. For embankments up to ten (10) feet in height, the embankment top width should be a minimum of eight (8) feet. Channels or earth bunds or sand bag barriers should be provided on site to properly direct stormwater to such silt removal facilities. Attenuation Crates. Brand Turtle Enviro. 6. Branch Network 30-day returns to your local JDP branch. what is a silt trap chamber - silt chamberyou a septic tank owner?Are you about the install a septic tank?Are you about to re. This soakaway set is a squarer shaped soakaway measuring 1600mm (L) x 1430mm (W) x 440mm (D). As with other silt. Wastewater collected from canteen kitchens， including that from basins. Code AICCP600B15. We have a drain/soakaway in the driveway. Aqua Storm 20T Light Duty Soakaway Crates 1000 x 1000 x 400mm (0. Nationwide Delivery dependable delivery across the UK. How to install a soakaway with an in line silt trap . 5m x 10m Non Woven Geotextile Minipack. We provide high quality products from leading UK and. Capacity. Newer soakaways have larger empty chambers, dont use hardcore/gravel pits and therefore dont silt up as fast. This is most common if the membrane is broken, the crates are the wrong size or capacity, or the pipes have collapsed. The SS500160 SiltGuard Silt Trap is a 450mm diameter chamber with a catchpit and filter, designed to be put in line in front of a soakaway This silt trap has a depth of 1080mm and features one 160mm inlet and one 160mm outlet. FloPlast D732 Sump Trap Unit & Basket Black 114mm x 340mm. 94 £263. $169. 1L. £253. 3 Ponds 31 6. How To install Your Catchpit. Soakaway SiltGuard Silt Trap C/W Catchpit and Filter with Lid - 600mm Deep x 300mm Diameter. A silt filter chamber – also known as a ‘silt trap’ – is a basin that is set upstream of a soakaway crate. As far as we can find out there is only one thing that is required for us to do and that is a rear soakaway. A silt trap will prevent. Getting it emptied pronto might just prevent any permanent damage. This document describes the products from Polypipe Water Management Solutions for. 2. Order now from BP Plastics. £433. 57 Save 20%. The separated water discharges from the unit by gravity. This is usually achieved with a number of chambers within the tank and the use of T pipes or baffles. Surface water drain pipes normally discharge to a watercourse or indirectly into the groundwater via a soakaway. It is also suitable to restore an As New look to old windows and plastic garden furniture. 00. Located upstream of retention, attenuation and infiltration drainage systems, RIDGISTORMSeparate Silt Traps capture and retain silt and. (Max 10000) ADD TO BASKET. . Draintex is an 80gsm non-woven geotextile membrane for drainage, filtration and separation. Silt trap. Silt Guard 300 Series Silt Trap for 110mm Pipework with Filter Bucket and Access Cover From £289. Product Description. 93 £7. We offer a wide range of domestic silt traps and catchpits to meet your specific needs. Code G4110M3K; Brand Graf; £415. We offer a choice of three sizes - Mini, Basic and Advanced Silt Traps. Also we exlpain how the silt trap works and how to maintain it. We recommend using a Silt Trap upstream of your soakaway system to preven the ingress of solids and silt. Silt Bucket for use with our 300mm x 600mm Yard Gully. The SS500160 SiltGuard Silt Trap is a 450mm diameter chamber with a catchpit and filter, designed to be put in line in front of a soakaway This silt trap has a depth of 1080mm and features one 160mm inlet and one 160mm outlet. An introduction video to the sentinel silt trap, our new product that goes hand in hand with a soakaway crate. Alternatively, fabricated. 09 Save 20%. If the water hasn't drained away after you cleared out the grid and the gully, it means that the blockage must be further down the pipeline. Refer to Engineer Drawings xxxxxxx Inlet Connections: xxx mm Outlet pipe diameter: xxx mm. Clogged pipes or silted soakaways can cause a build-up of this surface water. Brand Turtle Enviro. Add to Compare. The range of underground drainage supplies includes a variety of items specifically designed for sub-terrain drainage installation. 1. Soakaway Maintenance. 19 November 2016 at 1:30PM in In my home (includes DIY) MoneySaving. Brand Turtle Enviro. The reinforced watertight one-piece chamber structures offer greater design. 5-metre roll. . Silt Trap 300mm for 110mm Pipe or 150mm TwinwallThis 300mm diameter factory-built silt trap is delivered to site ready for installation. A septic tank should only need emptying when the. Silt Traps Proven in thousands of installations, our range of silt traps perform an essential function, effectively removing silt and sand from rainwater before it enters the storage or soakaway tank. Rainwater Harvesting. 300mm deep silt trap sump. Product Code: PSMST110. 4. 4m3)The Aqua Storm 20T light duty soak away crates are suitable. The kit also includes 1 x 10m2 roll of white non-woven geotextile. Also we exlpain how the silt trap works and how to maintain it. 5-7 days . Consider a pre-filter. Brand Turtle Enviro. 955 Litres. Rainsmart Ellipse Soakaway Set Flat-Packed with Silt Trap & Lid 1 Cubic Metre . 24. This fitting is usually used in conjunction with our GULLY300 Yard Gully. £219. Some items have a Bulky charge. Quick View. Polystorm Soakaway Crates 1000mm L X 500mm W X 400mm DEach crate has a capacity of approx. 3 Qualitative summary and comparison 73 6. Standard (24 - 40 Tonne) Heavy (65 Tonne) Soakaway Crates - Deep . 7b. Suitable for use with ULTRA3 pipework and fittings. Take the drain cover off and pour the boiling water down the drain. Buy Now. 50 £297. Code AICCP450B-2. Silt Trap - A Pre-filter For Your Soakaway Introducing Nero Drainage Cells. Items you will need. Geotextile Membrane - 4. Soakaway Crates - Shallow . Precast Concrete Ring soakaway with simple incoming pipe. No idea which it is but it was full to the brim with mud and crud. The disposal point of a land drain system, whether it's a manhole, a soakaway , leach field or an outfall , is always at the lowest point of the system. Code GEOTEX; From 5 reviews £160. Typical silt trap 4 Figure 24 43 Percolation test for designing a soakaway system 4 Figure 25 44 Percolation test for designing a soakaway system - worked example 4 Figure 26 45 Guidance on soakaway for single house development 4 13 46 Volumetric data per linear metre for one cell wide trench configuration 4 14 46450mm diameter catch pit/silt trap. Unfortunately, unblocking a soakaway isn’t something you can do. 00 £498. ex. Country. Soakaway Depth. We offer a range of silt traps, flow control units and adaptors are also available to complete the system. Detail the position and design of any silt traps required to prevent silt and grit entering into the drainage system. 00 In line Back Flow Prevention Non Return Valve 110mm, 160mm, 200mmGrease traps are an effective and hygenic method of separating fat and grease from wastewater flow. $91. A surface water drainage system should be tested to ensure the system is laid and is functioning correctly. Designed to separate debris and any unwanted particles entering and blocking the downstream pipework, this silt trap can be used upstream of small sized attenuation, retention and infiltration systems for domestic driveways and gardens. Emptying the filter on a regular basis (this is only a five minute. Would also advise including a silt trap with your proposed set up. 65 £334. add to cart. We recommend using a Silt Trap upstream of your. Contributing to this thread, it has now occurred to me that, with a fairly modern house, it's very possible that the silt trap was being overfilled with rotting leaves and moss and couldn't do its job. 96 £541. 400l : 2no Crates = 0. Join. Rainsmart Ellipse Soakaway Set Flat-Packed with Silt Trap & Lid 1 Cubic Metre. These silt traps filter out sediment to help prevent the soakaway silting up thus ensuring longevity and an efficient soakaway system, as well as preventing flooding of the attenuation system. Soakaway Crates - Shallow . Sustainable Drainage Systems (SuDS) is now a prerequisite on many developments and is being driven by the. Silt Trap 300mm for 110mm Pipe or 150mm TwinwallThis 300mm diameter factory-built silt trap is delivered to site ready for installation. 18. 4 Knowledge gaps 74 7 Potential delivery mechanisms 75 8 Summary and conclusions 77 9 Technical Annex 78what is a silt trap chamber Are you a septic tank owner? Are you about the install a septic tank? Are you about to repair a. Underground Drainage. 4 Advantages and disadvantages . a catch-pit or silt trap should be considered preceding any outfall to a natural watercourse or sewer system, to remove. Soakaway Construction Specifications are an important part of the soakaway design. Buy SiltGuard Silt Trap with Filter And Lid - 1080mm Deep x 450mm Diameter with 160mm Outlets with PVC Cladding. Standard (24 - 40 Tonne) Heavy (65 Tonne) Soakaway Crates - Shallow . The soakaway must not be near any other soakaway or drainage field, as this would compromise the absorption of the ground. 25m3) From £54. About Us FAQs Delivery Lighthouse Club Contact Us Home. The crates feature voids, allowing large volumes of water sufficient surface area to seep back into the ground. Additionally, the set contains a Sentinel Silt Trap C/W Catchpit and Filter to filter out sediments and allow a clean flow of water into the soakaway, as well as Cover. The assembly of this set really is a quick and easy process taking around 10-12 minutes in total and the self-assembly set represents excellent value for money - it is around £. Some items have a Pallet charge. £414. The system is comprised of base plates, crates and side. If too much silt and debris enters your water storage system it will cause damage, interfere with your system’s ability to remove water, clog pipes, fill soakaway systems and reduce their capacity for holding water. The Polystorm 8 Step Guide is designed to provide guidance to design the perfect system for retention, attenuation or soakaway at a variety of depths. 1 Sediment traps 17 6. Complete kit: 450mm Basic Silt Trap Chamber. Silt traps should be regularly checked and maintained to ensure their efficiency and prevent overflow of materials getting into the soakaway. VAT £46. Post by dmoblay » Sat Mar 27, 2021 3:16 pm. P Trap gullies or not roddable. Hot and Cold solutions; Above ground commercial;PBSL Group give a brief video of their inline silt trap or sediment trap, ideal for installation with soakaways. Rainsmart Ellipse Soakaway Set Flat-Packed with Silt Trap & Lid 1 Cubic Metre . Installation in heavy clay soil should be avoided. 2-3 days . This closes the pores and fissures at the excavation interface leading to. Wastewater collected from canteen kitchens， including that from basins. Code 90004M3FK; Brand Rainsmart; From 7 reviews £414. Integrally there is a removable silt basket under the inlet. Some Turtle items have a Bulky or Pallet charge. Buy Online Free Delivery Over £75. If you’re looking for maximum efficiency and a long lifespan, you can choose to fit a silt trap on the drainage pipe that leads to the soakaway. The Silt Guard 300 Series is designed for installation upstream of medium to large volume, cellular/crate-attenuation systems, ponds, swales and irrigation systems. Select the right Modular Cell Polystorm Lite – PSM2 Polystorm Lite has been specifically designed for non-trafficked applications. The soakaway should then be placed in the hole with the cut holes in the soakaway facing away from the foundations of the building. Agri. 36 £518. soakaway and extend its working life you should ideally incorporate into the system a pre-filter such as our Sentinel Silt Trap. The McAlpine soakaway should be installed in a hole depth of approximately 400mm minimum x 200mm in diameter. Rainsmart Ellipse Soakaway Set Flat-Packed with Silt Trap & Lid 1 Cubic Metre . Silt traps typically include a filtration bucket to separate solids and finer particles, whereas catch pits. 97. Then get come old cloths and fully soak them in water and cram them into the drain so that it is full of cloth up to the top. We offer an extensive range of Silt Traps and Catchpits for surface & storm water drainage. 2 Cubic Metre Soakaway Crates. Hydrocell Soakaway Crate available at The Drainage Shop. Additionally, the set contains a Sentinel Silt Trap C/W Catchpit and Filter to filter out sediments and allow a clean flow of water into the soakaway, as well as Cover. From 4 reviews. Some Turtle items have a Bulky or Pallet charge. A soakaway system is an online system whereby all storm water flows into the crate structure and infiltrates into the surrounding ground as and when saturation allows, until the crate structure is completely empty. Hydrocell soakaway crates are used in soakaways, stormwater retention, attenuation or infiltration applications. If the septic tank isn’t emptied regularly enough. Prepare your first layer of cells by fixing a base plate underneath each cell. . Users of the system flushing non-degradable and man-made material. 47 £497. For use in a SUDs system to collect any suspended silts before a cellular soakaway/attenuation system. A silt trap is a ‘basin’-type device that is placed in the upstream of a soakaway crate. Silt Trap - A Pre-filter For Your Soakaway Introducing Nero Drainage Cells. At the end of the day, it is still recommended that a soakaway crate be fully replaced every 10. 1 m³. Surface area (Given) of tank is 12. Inlet to soakaway/attenuation tank 4. Dig the hole for the soakaway and pipes, ensuring sufficient depth to include a base layer of rock/rubble, the soakaway. uk What is a silt trap? EasyMerchant Silt Traps are designed specifically for use with soakaway systems, helping to disperse surface water and other drainage. All the essential detail is covered in the Sewers For Adoption document, which you can buy. 9 Cubic Metre. If the soakaway itself is blocked, sometimes only a full replacement or digging up the system and. Browse our extensive BIM library for free Revit families. 6 Wetlands 52 6. We are in the process of selling our property and have Building Control coming round towards the end of the week to do a final inspection. non-woven geotextile to prevent any ingress of silt to the crate structure. 0:00 / 14:23 Installing Rainwater Soakaway and Silt Trap - Driveway Prep! - The Home Extension - Episode 26 JW Home Improvements 1. Removable grit interceptors should be incorporated into the surface water gully pots to trap the silt or grit. 2. 62 £649. Rainsmart Ellipse Soakaway Set Assembled with Silt Trap & Lid 1 Cubic Metre. Emptying the filter on a regular basis (this is only. Our 90003F option is a longer, narrow soakaway measuring 3200mm (L) x 715mm (W) x. 53 Each quantity Collection Set Store. View Product. 5-metre roll. Product Description. We stock silt traps for 110mm & 160mm uPVC drainage systems, as well as 150mm, 225mm, 300mm twinwall drainage systems. Silt trap chamber with minimum 300mm sump. This product is ideal to locate at. Polypipe Polystorm-R PSM1a Heavy Duty (65 Tonne) Soakaway Crate 1000mm L X 500mm W X 400mm DYour soil type will determine the efficiency of the soakaway system. 71 Save 20% . To work this out measure the areas your property covers consisting of the external hard surfaces — such as roofs and garages down towards your patios, driveway and paths. The next day, refill the test hole with water up to a depth of 300mm, and observe how quickly the water seeps away.