Complete crate weighs 9kg. The Rainbox 3S boxes arrive flat-packed for more efficient shipping and less CO2 emissions. 4m in size. 5kg. 3, and that it needs to be evaluated for the severity of deterioration. attenuation tank using graf ecobloc maxx project graf standard details drawn : checked : db mc date : scale : 05. 65 Incl. If creating a larger soakaway through butting and stacking, we recommend connecting using cable ties until the side fill is introduced. What is the difference between a soakaway and an attenuation tank? A soakaway, as the name. Add to Compare. 4m 3 per pallet each crate has a storage capacity of 400 litres (95. The effects of climate change are creating an unprecedented demand for Sustainable urban Drainage Systems (SuDS). If you live close. to join crates together to create an attenuation tank. The Rain Bloc compact 300 soakaway crate can be used in both infiltration and attenuation systems. See the illustration. Please contact us for more information on how we can help you. £27. The NEW AquaCell NG is a sustainable attenuation crate which is faster to install, easier and a more sustainable attenuation tank. 09-11-2023 What are the different types of flood defence systems in the UK? by Graf UK. The system can be placed deeper in the ground. A) CRATE SYSTEM. If you're planning a project using Attenuation Tanks. 72 £57. 61’ x 0. 5m x 0. Q&A. Figure 4: Dimensions of Attenuation Crate Used (Water Management Solutions: Modular Cell Systems, 2011) tanks have land usage implications and this is not ideal in an urban envi-ronment. Access for inspection and maintenance is via Stormbloc ® Inspect. The Rain Bloc can withstand up to 60T with. The honeycomb design is extremely strong allowing vehicle loading with minimal cover. DOMESTIC SEWAGE TREATMENT PLANTS. Maximum installation depth of. FREE Delivery. Legal requriements and building regulations around drainage are becoming ever more stringent. 11 ex VAT. com : CORE Water | Soakaway Crates | Attenuation, Infiltration, Stormwater Retention Crate for Residential and Commercial Projects | Perfect for Flood Mitigation,. Add to Compare. Attenuation Storage Tanks - Multifunctional Benefits. Anthony is a Chartered Civil Engineer with considerable experience in water, hydrology, flood risk and drainage, particularly in relation to SuDS design and hydraulic modelling. The Attenuation calculator can be used to evaluate the performance of different types of circuits or systems and to determine the impact of different factors such as component tolerances, temperature changes, or. Our soakaway crates (Aquacrate 400) clip together to form a load-bearing underground water storage/attenuation system. Void Ratio: 95%. For attenuation, ensure the tank is surrounded by both geotextile fleece and. 4m in size and can hold 0. Weight: 6. Quick view. Always seek approval It’s recommended that you should always seek approval from your local planning authority prior to commencing any works as often soakaways will need to be built with a. Sort By. Access for inspection and maintenance is via Stormbloc ® Inspect chambers and the channels in the blocks allow access for CCTV and cleaning to ensure that the storage volume of the system isn’t reduced by the build up of silts. attenuate: 1 v become weaker, in strength, value, or magnitude Types: refine attenuate or reduce in vigor, strength, or validity by polishing or purifying Type of: weaken become. Out of Stock. 5m x 0. In contrast to soakaway crates, which allow rainwater to directly soak back into the soil, attenuation tanks temporarily store rainwater during a heavy spell of rainfall and release it at a controlled rate into drainage systems or a natural body of water. If purchasing in bulk give us a call so we can offer you the best price. 300 to +. • Project Explore, Steetley - Attenuation Pond Lining (15,000m²) Stormwater Management Limited Fleming Road Harrowbrook Ind Est Hinckley Leicestershire LE10 3DU Tel: 01455 502222 Fax: 01455 502223 Email: sales@storm. attenuation tank using graf ecobloc flex project graf standard details drawn : checked : db mc date : scale : 01. FREE shipping and FAST delivery. The Polystorm range of products and solutions for attenuation and soakaway applications. A soakaway is really just an area where excess water can percolate. Each crate is 0. Rainsmart Soakaway Crate Assembled - Heavy 65 Tonne . In conclusion, the art of gravel application is a fusion of time-honoured techniques and modern innovations. 25% Off Sold Out. So, what are the differences between stormwater storage crates for filtration and attenuation? Let’s find out. This helps stops soil from entering and clogging up the system. 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. At present FreeFlush is proud to brought two Soakaway crate alternative, comprising two models of Rainwater Soakaway Attenuation Crate Packages. It is supplied fully assembled, which makes installation much easier to plan and complete. An attenuation crate stores the water and redirects it to somewhere else. 0 0. This Brett Martin StormCrate55 is a modular cellar crate system designed to be used as attenuation cells or for soakaway applications. Your property's total impermeable area is one of the details you would need to provide to work out how many crates you need. Rainsmart Ellipse Soakaway Crate. 3 StormCrates per 1m³ storage capacity • Lightweight and easy to install in up to 10 layers • High strength crate with lorry bearing of up to 60 tonnesMax. Attenuation is. 3. Thrilled to have delivered the first instalment from our huge order of over 1000+ soakaway crates to. Creating an underground tank of attenuation crates provides an ideal soakaway at. They can be used in soft landscaped or trafficked applications up to a gross vehicle weight (GVW) of 12 tonnes. Paired with quality construction supplies, it ensures a foundation that withstands the test of time. StormCrate55 modular cellular crates are used in storm water retention, attenuation and infiltration applications. Cut outs are available for incoming pipework. Buy online today or call us for more information!Stormwater attenuation and infiltration tanks constructed using modular plastic geocellular units are commonly used as part of sustainable drainage and rainwater harvesting systems. It can be easily installed without heavy machinery one EcoBloc Inspect flex module weighs just 8 kg. Soakaway crates can be used for rainwater attenuation or soakaway purposes in commercial and domestic projects. Visual and maintenance access can be achieved when used in conjunction with Polystorm Access & Polystorm Inspect. Large net storage volume of 287 litres per crate (302. Civils & Drainage. The crates are designed to be simply and easily stacked together to create a below ground storm water holding tank or to allow the infiltration of storm water into the ground around them. 00 10,000 litre SuDS Rainwater Attenuation Tank with integrated flow regulator. Introducing IBRABASE, our eco-friendly shed base grid system, made entirely from recycled plastic. This Brett Martin StormCrate55 is a modular cellar crate system designed to be used as attenuation cells or for soakaway applications. the property of something that has been weakened or reduced in. Therefore maximising an area for both land use and stormwater management is crucial in a developed city. £27. The level of released water must be calculated to flow at the correct rate as this. It is suitable for a wide range of landscaped and trafficked applications, including: Landscaped Parks. Used in landscaped areas, or in trafficked areas up to a Gross Vehicle Weight (GVW) of 30 tonnes. In this guide, we will be going step by step through the process of Installing an Attenuation Tank. 00. In an attenuation scheme, water is stored within the system and, with the aid of flow controls, is slowly released back into a watercourse or sewer. COMMERCIAL SEWAGE TREATMENT PLANTS. Plastic & Clay Drainage. They are one wonderful solution for drainage and places where infiltration is possible for the existence of silt, sand and gravel you can. 11. Rainwater harvesting system is seen to be comprised of number of stages which usually includes the drains, filtration, storage also reusing the same. Easy to handle and install. With a reservoir volume in excess up to 97 %, it is a market-leading product. 8. GREASE MANAGEMENT. Therefore maximising an area for both land use and stormwater management is crucial in a developed city. 5 metres from the boundary. Inc. Our EcoBloc stormwater attenuation crates are renowned for their modular nature, enabling them to fit into small spaces suiting different site specific constraints. What are the different types of attenuation crates? There are several types of attenuation crates that can be used for different applications: Single piece crates. 2021 various@a3 p1preliminary for approval ap05. Get in touch 01753 652 555. • Crate storage capacity of 217 litres • Inspectable & jettable with a configuration Installation minimums and maximums are determined by vertical Loading Class (GVW) • Lightweight crates at just 9kg of RAINBOX® Cube within the system loading (backfill and loads linked to operations) and horizontal • Simple and quick installation. Storage Volume: 237. 00 each. All penetrations are sealed to ensure one-hundred-percent waterproofing integrity, using stainless-steel bands or special components provided by the crate/block Manufacturer. This protection fleece non-woven geotextile is white in colour, 2 metres wide and available in a standard roll length of 50 metres. 00 £498. 5kg. Save up to 80% of freight costs with EcoBloc light. Our stormwater attenuation and soakaway crates are built to last due to the quality material we use and come with a 50-year design life. Soakaways are generally designed for small usage, like isolated residential properties and permeable ground conditions, like sand or gravel. This below ground Rain Bloc crate is a simple an effective way to form a Soakaway or attenuation tank. From £6,019. Rain Bloc 60 Tonne Soakaway and Attenuation Crate - 0. This product can bear up to 62 tonnes and is 1m x 0. 11. see more. Reviews. Ideal for retention, attenuation or soakaway applications with a suitable geomembrane or geotextile. Increase in linear attenuation coefficients was observed, showing that changing crystal structure changes linear attenuation coefficient of a material. Attenuation Tanks. An attenuation tank is essentially a large container that acts as a buffer to store excess rainwater in the event of a storm and remove the risk of flooding of a residential area. For example, a 50m2 roof area would require a crate soakaway of. As you. Features & Benefits: AquaCrate Stormwater Soakaway and Attenuation Crate 20 Tonne - 2. Hydrocell Soakaway Crate 62 Ton. 3 Crates per m3, 60 Tonne Rated. High compressive strength – can be located under all roads,Rain Bloc 60 Tonne Soakaway and Attenuation Crate - 0. If the crates are used for attenuation, the water will drain away slowly into the drainage system. This should give you a total impermeable area in. Attenuation crates, Storm Cells, Soakaway Modules, Storm Crates all names for the same thing, they describe an interlocking crate system that has high strength and high void ratio: for Aquavoid Eco >95% They allow surface water to be stored in one location and gradually released back to the ground, a bit at a time, at a pace the ground can handle, rather than. Effective SuDS should always ensure systems are set up to handle adverse weather conditions and high volumes of water -. Cellular rainwater attenuation module; Swift installation in up to 10 layers; Perfect for residential. Inc. Product Infiltrator® Chamber Systems. This crate system can be supplied with an appropriate geotextile layer to wrap the crates for infiltration systems and attenuation systems. Add to Compare. The CORE WATER crate is a step forward in drainage technology; advancing from the old-fashioned, inefficient soakways filled with hardcore and building waste, the crate provides a safe and intelligent solution to rainwater management. Can be used as part of an intelligently engineered hybrid system with Polystorm Xtra and Polystorm Lite. Great for pedestrian and vehicular areas beneath. “ attenuation in the volume of the sound”. 9 Cubic Metre . This is where our soakaway crates come in. Recyclable. Attenuation is measured in decibels (dB) or voltage. They are modular, so multiple crates can be used for a soakaway system capable of. For more information on the Polypipe Polystorm-R PSM1A please discuss your project in more detail with JDP Technical Support on 01228 794426 (Mon-Fri 8am to 4pm) or technical@jdpipes. It enables engineers to create a blue or green roof drainage layer that gives architects the design flexibility required to create imaginative, multi-functional open. What is StormCrate? StormCrate is a cellular stormwater attenuation crate. (1) From £ 0. 50 each. 5 per m³) This item: CORE Water | Soakaway Crates | Attenuation, Infiltration, Stormwater Retention Crate for Residential and Commercial Projects | Perfect for Flood Mitigation, Stormwater Management System $150. The crates have multiple integral shear connectors built into each unit that locate into the crate below. 25 metres. Stormwater attenuation tanks provide a storage system for rainwater and surface water. Can be used as part of an intelligently engineered hybrid system in. A geotextile removes debris from stormwater while the addition of a geomembrane enables water storage when required. This robust crate creates a structural void in the ground to allow water to flow in from surrounding subsoil and helps to alleviate flooding. Capacity: 400 litres (2. 354mm in length, 708mm in width, 150mm in height. With our state-of-the-art technology and innovative designs, StormGuard+ is set to redefine how rainfall affects areas prone to flooding or with minimal drainage. Rainsmart's Terravault is a modular cellular confinement crate system that protects tree roots from both vehicular and foot traffic. An attenuation tank is an important flood prevention system that is used to store excess rainfall before slowly releasing the water back into the watercourse (such as a river or reservoir) when it is safe to do so. You will be having one bespoke solution to get rid of water logging issues and manage the flood water. Introducing the IBRAN-A Heavy Duty Soakaway and Attenuation Crate - a powerhouse solution designed to withstand the toughest conditions. The surface water run-off is slowed down before it is discharged into the local. £58. Stackable crates. Fig. As the crate structure fills, water begins to exfiltrate from the tank into the surrounding ground. Attenuation Tanks. GT 500 Attenuation Tank LinerThis product is shipped direct from the manufacturer: 2-3 day lead time. Did you love our StormGuard attenuation crate? If so, there is no doubt you will love the HexiCell… The HexiCell is an innovative attenuation system, designed to manage storm water and. KLARGESTER AQUAHOLD SM05 - 5,000 litres. Whether we have too much or not enough, it is as much a life giving resource as it can be life threatening. £69. This is provided free of charge from JDP Technical Support. This Polypipe PSM1A soakaway crate, also known as Polystorm-R is designed for not only soakaway applications but also for attenuation cells. 00 each. Rain Bloc Stormwater Attenuation/Soakaway Crate. An offline attenuation system is where the inlet/outlet is connected to the same manhole/inspection chamber. As well as attenuation, the AquaCrate can also be used for greywater storage. The storage volume required for soakaway or attenuation purposes is based on these two variables. The Brett Martin Stormcrate 55T Soakaway Crate is the perfect solution for managing stormwater runoff. 01753 652 555 CORE TRADE. AquaCell Eco is manufactured from specially reformulated, recycled material and has been specifically designed for use in shallow, non-trafficked areas such as domestic gardens and similar landscaped sites. Due to increased activity in the building sector over the last decade or so, Local Authorities have laid down strict guidelines for developers, who wish to construct new projects on existing non-developed land. The Polystorm geocellular range is ideally suited to deeper applications and can accommodate a wide range of traffic loadings, from pedestrianised areas to large HGV parks. Impermeable and Geotextile membranes. Account. This product can bear up to 62 tonnes and is 1m x 0. They have an inlet that allows up to 97% of their occupied space to fill with water. Our Aquacrate 400 attenuation is available for Supply & Install or Supply only. 480 ft³)/Truck The GRAF EcoBloc Maxx is the ultimate stormwater management solution designed for versatile applications including soakaway, stormwater attenuation, and rainwater. 2. We supply 20 tonne crates for pedestrian traffic and all the way up to 100 tonne crates for HGVs and heavy plant traffic. 1000mm x 1000mm x 400mm each crate holds 0. £1. 72 £57. The crates hold water when there is a sudden large flow in a storm to alleviate the. 4 Crates per 1m Cubed. Both for domestic and commercial applications, modern soakaway attenuation crates are in use for the purpose of holding rainwater for a long period primarily. 09-11-2023 What are the different types of flood defence systems in the UK? by Graf UK. In this video we take yo. Documentation. Welcome to the future of water management with the StormGuard+, the revolutionary attenuation crate provided by Polycon Water Management. Quantity: 25 Year Guarantee. MWS158 Polystorm-R PSM1A Modular Water Storage Unit 1000x500x400mm (61T/m2 Loading) c/w PSMCLIP. You should receive some clips or ties with the crates. Dimensions: 1200mm x 600mm x 347mm. attenuation tank crates (specification and design subject to site & project requirements, by others) juta netex 300tt geotextile juta netex 300tt geotextile juta hdpe 0. Soakaway crates can be used on a number of different projects to create effective storage & attenuation systems VERSATILE Our soakaway crates are able to withstand upwards of 20 tonnes dependent on the variation you choose. Our soakaway crates clip together to form a load-bearing underground water storage/attenuation system. 100% recyclable. This allows any construction site to release water at a rate that drains can adequately handle, thereby preventing a flood. Sub-total £0. Attenuation Crates 20T to 75T Load Rating. Rain Bloc Stormwater Attenuation/Soakaway Crate. £36. VAT. 25m2) Full specification at the bottom of this page. From £ 0. These leave virtually the whole space open to be filled with rainwater and are therefore much more effective. StormCrate55 modular cellular crates are used in storm water retention, attenuation and infiltration applications. 1000 x 1000 x 400mm (50 Tonne) Flood Crate Product Code: FC-50 £ 75. Both for domestic and commercial applications, modern soakaway attenuation crates are in use for the purpose of holding rainwater for a long period primarily. 00 £68. ACO RoofBloxx Reservoir Tray Wall Extender Joiner - 60mm. 3 Cubic Metre . Features & Benefits: Storage capacity of 290 litres. The crate structure is surrounded with a permeable non-woven geotextile to prevent any ingress of silt to the crate structure. But the main object of installing large soakaway attenuation crates in underground is to allow water infiltrate into the surrounding soil slowly. Set your delivery address or collection branch to see what's available. Its flexible modular structure is light but strong, making it ideal for use beneath areas such as roads, car parks and industrial areas. Crate Class: Light/Medium Duty. Code G4110SC; £45. The crates are ideal for soakaways and attenuation tanks specified by planning and building control. The modular cells combine to provide water storage structures to help with localised flood. So, if you’re installing your soakaway beneath a driveway, check the loadbearing strength before buying. of. proslab. An attenuation tank follows a very simple process to receive, store and release excess rainwater: When there is heavy rainfall that the local systems will struggle to cope with, an attenuation tank is ready to take in the water to help reduce the likelihood of flooding. 4. weakening in force or intensity. Its versatile design allows the system to be used in configurations and applications across all construction environments as a standalone solution. View products. Attenuation tanks are installed in an excavation prepared and backfilled by the contractor using Variobox crates, LLPE membrane and a protective fleece. Brett Martin Cellular Storm Water Crate 55 Tonne - 1200mm x 600mm x 347mm. The proposed. A flow equalizer is required when the velocity profile is not uniform. 3 Cubic Metre . 3 crates per m3 gross volume). Contact Us today 01616671241. Excavate the area, making a hole that is the right size for the crates and the top, side and base fillers of gravel and sand. McAlpine Plastic Inlet Soakaway For Condense Drainage SOAK1GR 110mm x 300mm x 22mm. £27. Storage capacity of 217 litres. Inc. Attenuation Design. Size: 2. Polystorm: an 8 Step Guide. Soakaway crates can be used for rainwater attenuation or soakaway purposes in commercial and domestic projects. We can also offer an installation service if required. 4m in size. ALL. The key difference is the lack of impermeable geomembrane liner. Then the power at z = 0 z = 0 relative to the. Polystorm-R is designed to offer a solution in issues of surface water attenuation, surface water retention or surface water infiltration. Stacked on pallets to save space during transport reducing costs and CO 2 emissions. Attenuate definition: to weaken or reduce in force, intensity, effect, quantity, or value. CIRIA RP992 The SuDS Manual Update: Paper RP992/21 Guidance on the Maintenance Plan 3 Maintenance Inspection Checklists 3. 60 £54. Dimensions: 1000mm x 500mm x. 3. There are 5 main variations to choose from, each one offering different features benefits depending on your drainage need and installation environment. Search. Attenuation. Features & Benefits: ACO RoofBloxx Water Attenuation Crate. 25m3 of water. 95 (£48. They are modular, so multiple crates can be used for a soakaway system capable of providing the desired flow rate of water to a body of water or drain. We can also offer an installation service if. ground and the surface area of the crate structure sides and base). ACO RainDrain Channel and Galvanised Grating A 15 - 118mm x 97mm x 1000mm. Select a suitable Naylor liner: If a permeable infiltration system is required choose a single layer of Naylor GT As the crate structure fills, water begins to exfiltrate from the tank into the surrounding ground. COMMERCIAL. A few pointers are noted as follows: EcoBloc Flex is a modular geocellular unit which is used as a below ground stormwater attenuation or soakaway tank. We manufacture the UK's best selling gravel parking grids using locally sourced, eco-friendly recycled plastic. 02. GT 500 2000 gauge Impermeable Tank Line Membrane. 9: Attenuation Rate. As a key part of our overall SuDS offering, our Klargester AquaHold attenuation range offers many benefits over traditional crate systems. Rain Bloc Stormwater Attenuation/Soakaway Crate. Crafted from 100% recycled plastic and manufactured within the UK our Rainsmart Ellipse storm and water attenuation crates are buried under earth, gravel or other permeable materials which creates a void space for the purpose of holding rain-water whilst allowing surface water to drain away. This helps redirect the water collected to a storm drain or local body of. Attenuation Rainwater, which has been collected from impermeable surfaces, is directed to the crate structureStormwater Attenuation Crates I Stormwater Attenuation Tanks I Stormwater Attenuation Lagoons. Allied to SDS SYMBiotIC™ smart monitoring and control these devices protect nature-based solutions from the impacts of excessive or. Crate size 1200mm (L) x 600mm (W) x 420mm (D) (3. Attenuation. Efficient pallet stacking provides quick construction and installation. The system facilitates quick and easy assembly on site where multiple configurations can be formed. * Dimensions 1200 x 600 x 420mm Gross Volume 302 L Storage Volume 287 L Void Ratio 95% Materials Recycled Polypropylene Recyclable 100% Approx. The crates are manufactured from durable plastic which clip together easily to form a box structure. The StormMaster Heavy Duty Soak-away and Attenuation Crate is an extremely strong water permeable unit with a large storage capacity. These soakaway crates (Polystorm) clip together to form a load-bearing underground water storage/attenuation system. Soakaway crates can be used for rainwater attenuation or soakaway purposes in commercial and domestic projects. The Infiltrator ® Chamber is a pre-manufactured open underground unit that acts as a direct replacement for conventional storm water and waste water attenuation. One of the key benefits of this type of system is the modular construction, which allows multiple crates to be built to suit the immediate environment. Features & Benefits: Graf Rain Bloc Stormwater Attenuation Crate - 3. Attenuation crate systems offer a cost-effective solution for storm water management, dealing with large volumes of surface water and releasing at a controlled rate back into. It can hold 0. 50 each. Skip to main content. Precast Concrete Tanks offer a low maintenance solution. Grass parking grids which quickly connect together for churn-free grass driveways and parking spaces. The attenuation is measured in decibels (dB), which is a logarithmic unit of measurement that expresses the ratio of two values. The crates are designed to be easily stacked together to create a below ground storm water holding. Inc. g cars and HGV’s. If you have a special requirement or any questions, please contact us on 01430 430 529 or email enquiries@gwapipes. Description. Product Details. Wavin AquaCell stormwater infiltration and attenuation tanks can be constructed using these modular cells or units to help manage storm water run off and reduce flood risks. Features & Benefits: Storage capacity of 290 litres. Ideal for retention, attenuation or soakaway applications with a suitable geomembrane or geotextile. From £3,669. Attenuation Tanks. Features & Benefits: Formpave Distribution Tank Single - 354 x 708 x 150mm. Not only are they more efficient with a larger void capacity (95%) they also have superior structural integrity. Ideal for retention, attenuation or soakaway applications/schemes with a suitable geomembrane or geotextile. The full Rainbloc attenuation tank kit can be found here. 00 £68. Ecomerchant Aquacrate is designed for the storage (attenuation) of stormwater in both attenuation and infiltration schemes. Shop our collection of soakaway crates, attenuation crates & tanks here today from reputable brands like Aquacrate, Polypipe, Graf, Marsh Industries & more!. 0m x 0. VAT. 95% void ratio giving a holding capacity of 0. Its superior design makes it suitable for building storage tanks under HGV trafficked and car park areas as well as non-trafficked areas (e. Polypipe Civils Charnwood Business Park, Loughborough, Leicestershire LE11 1LE Tel: +44 (0) 1509 615100 Fax: +44 (0) 1509 610215 Email: civils@polypipe. Rain Bloc Stormwater Attenuation/Soakaway Crate. 40. Brett. For further information regarding Precast Concrete Tanks Please contact a member of our civil Sales Team on 028 2565 2566, Ext 3. Pluvial Cube and Polystorm Attenuation Crate Systems to install underground stormwater storage tanks. As a simple concept, it works like this. 19m3 per crate. Includes unperforated, perforated and half-perforated pipe in diameters from 110mm-600mm. Rated 5. Latest news & updates for RainBloc Crate for Attenuation and Infiltration tanks. g. AquaCell Core-R has been designed for use in deep applications, subject to regular and heavy traffic loadings, e. It can be easily installed without heavy machinery one EcoBloc Inspect flex module weighs just 8 kg. green amenity areas). Aquacrate Future Build Supplies Ltd 12 x Storm Crates for Soakaway Attenuation, Underground Storm Water Drainage 1000 x 500 x 400 (mm) Suitable for Pedestrian & Transport Applications 62 Tonne. SEPTIC TANKS. Visual and maintenance access can be achieved when used in conjunction with Polystorm Access & Polystorm Inspect. 8% void ratio, allowing rainwater run off to be temporarily stored and then released gradually, either into the soil acting as a. From £269.