crates for soakaway. Clay soils typically do not drain very well and can in some cases be impermeable. crates for soakaway

 
 Clay soils typically do not drain very well and can in some cases be impermeablecrates for soakaway Aquacrate Future Build Supplies Ltd 6 x 190 Litre Storm Crates for Soakaway Attenuation, Underground Storm Water Drainage 1000 x 500 x 400 (mm) Suitable for Pedestrian, 62 Tonne

Add to basket. The main function of a soakaway crate is to collect excess water from areas such as roof gutters and driveways and then slowly release the water into the. Our soakaway crates clip together to form a load-bearing underground water storage/attenuation system. 28 crates per m 3. The geotextile wrapping prevent soil ingress that can reduce the storage capacity and the ability to discharge into the ground. Wrap the whole system in the membrane, including the inlet pipe to stop anything from getting inside the system. Alternatively, contact us on webchat or email us here. 38 × 30 m 3 = 11. Mob: 07943 434 386. Can be used for both Trafficked and Non-Trafficked areas. £8. Capacity: Up to 120L (8 crates = 1m³) Colour: Black. 50 each. The soak pit is to be a hole filled with rocks. A Core Water Soakaway Crate with membrane measuring 800mm x 500mm x 540mm. Traditionally back filled with rubble, membrane over the top to prevent soil percolating down and filling the voids, then topped with soil. Void Ratio: 95%. (When calculating the size of a soak pit, the volume of water storage available for a rock-filled hole is 0. Soakaway crate sizes can vary, but a common size for residential use is around 1m x 1m x 1m. 4m3 per crate) £57. £27. Roof Repair. SDS GEOlight® has been constructed entirely from post-consumer recycled PVC waste, which is normally destined for landfill. Soakaway Crates – True or False “It’s cheaper to use hardcore to create a soakaway” False In fact, to buy the required amount of RecoCrates to fill a 1m³ hole is comparative with the cost to fill the same hole with recycled hardcore, making RecoCrates the cheaper option once you’ve factored in time & motion and labour. Soakaway Crates are now the favoured option for disposing of surface water in the UK. uk , buy now from Attenuation Tank Crates or call the sales office on 01255 258525. • Graf Stormwater soakaway crates: 3. 25m3 of water. •DYKA Rainbox 3S soakaway crates: 3. Suitable for Condensing Boilers. f - is the soil infiltration rate, in m/s, determined in accordance with clause 3. Underground drainage is a system that transports excess rainwater away from your home to stop the ground from becoming too wet. It can hold 0. 9 48 - 49 Installation 5 50 - 63 Health and safety 5. VAT£ 68. If you have any questions regarding our soakaway crate range, then please do not. ¾ in. Capacity – 400 Litres. 6m³ kits. And to do that, you will need to: 1. Wood crates, stackable milk crates and heavy duty plastic crates at great prices! Get free shipping on select items. Polystorm-R. A soakaway crate is used as part of a full drainage system in areas that experience high levels of surface. 3 72 - 73 Project Solutions. org. The list below also shows how many crates fit per m 3. A soakaway crate is a type of underground drainage solution used in home drainage systems. Supply Soakaway Crates, Polypipe Polystorm Cells for Multi Functional Water Management System. Rainsmart Ellipse Soakaway Set Flat-Packed with Silt Trap & Lid 1 Cubic Metre. Code 90004M3FK. These fabrics function. Stacked on pallets to save space during transport reducing costs and CO2 emissions. Price (highest first) FloPlast 110mm Underground Drainage Pipe 3m - Terracota. If you do not understand the formula, the percolation test, or the best way to form a soakaway, then come back and we will point you in right direction. 8 44 - 47 General layouts 4. If this isn’t the case it can be positioned next to the crates and held in place by the filler. Only 8 left in stock. These plastic crates have been designed as an alternative to gravel or other free-draining material used to fill a soakaway trench. Soakaway Crates are. First published in 1991 as a replacement for the old BRE 151, BRE 365 has become the standard methodology for soakaway design in the UK. Polystorm R Soakaway Crate (PSM1A) Sold complete with clips. Always cover the soakaway crates with a geotextile membrane to maintain the performance of the system. Soakaway crates for Attenuation and Infiltration. ONLINE STORE. Aquascape 71mm Interlaken Cast Iron Drain Grate 278mm - Pack of 4. £54. 95 incl VAT. ) as well as perform. Wrap the fabric over the top and shovel in topsoil, slightly overfilling to allow for settlement. A soakaway shouldn't require any maintenance, but it is a good idea to lift the cover and check the structure every few months or so to check for silting or contamination. Features & Benefits. More complex soakaway construction with additional depth, pipework, size or reinforcement. Soakaway crates are a popular solution for managing stormwater runoff, as they allow water to percolate into the ground. Plastic Packing Shims. Features & Benefits: AquaCrate Stormwater Soakaway and Attenuation Crate 20 Tonne - 2. damp proofing. 1. Flow Control Chambers - Orifice Chambers - Vortex Flow Control Units* ( orifice flow restrictor) We also offer a diverse range of Soakaway Crates for your convenience. Being much lighter than gravel they are easier to transport and handle and can be easily removed if your soakaway is temporary. a soakaway (designed for draining rainwater) installed after December 2007; Instead you must either: upgrade to a drainage field that meets British Standards (see rule 9) and check whether you. Add the crates into the hole on top of the membrane. The steps involved: Test the area for it’s porosity. 00 incl VAT. Compare. Stackable Black plastic crates Size:- Length: 2. Purchase Drainwell DIY soakwells or Drainwell plastic leach drains directly from the manufacturer. FloPlast 110mm Underground Drainage Double Socket Coupling - Terracotta. Brett Martin 315mm Inspection Chamber Riser 185mm High. 38 times the volume of the hole. We also offer Polystorm Access and Polystorm Inspect, which allow for. Delaware Valley Box and Lumber is the largest supplier in the New Jersey, Eastern Pennsylvania, Delaware and Northern Maryland area of custom wood crates for domestic and export shipping. A soakaway is simply a hole excavated in the ground and traditionally filled with rubble and coarse stone. g. Geotextile membranes are also used in a wide range of drainage projects such as soakaways and land drains. Either solution can be wrapped in a standard. A typical test for a surface water soakaway would be a pit 1000 x 1000 x 2000mm filled to the brim and the level recorded at various times until the pit is empty. The Ellipse Soakaway Crates are high quality, easy to assemble recycled plastic soakaways. They are often used to line a soakaway or land drain hole before the elements are inserted, to prevent any silt or debris from entering the soakaway, extending its lifespan by preventing blockages from occurring. Home & Garden Store. Brand new | Business. 9kg. co. Installing ACO drains is a very simple, straightforward process that anybody can do using the step-by-step guide below. A inspection chamber must be installed between the septic tank and the soakaway. 97' x 2. The purpose of these innovative crates is to allow excess rainwater to be released back into the ground. If significant silting-up is occuring on a regular basis, it may be worth constructing a catch pit to intercept silt from the inlet pipeline before it gets to the soakaway. Dig your hole neat to the box dims as the proper approach is to wrap the crates in geotextile and fill the overbreak with gravel. £58. Quality. Silt traps typically include a filtration bucket to separate solids. It is ideally suited to deeper applications and can accommodate a wide range of traffic loadings, from pedestrianised areas to large HGV parks. Therefore the above size soakaway will suffice. A popular size of soakaway crate specified by building inspectors is 1 cubic metre, which will drain a roof area of approximately 50m2 and hold 1,000 litres of rainwater. Years ago, soakaways began as a hole dug in the earth, before being lined with geotextile and filled with permeable material such as rubble or stone. We cannot be beaten on Quality or Price. 22 ex VAT) View Details. Aquacrate Future Build Supplies Ltd 6 x 190 Litre Storm Crates for Soakaway Attenuation, Underground Storm Water Drainage 1000 x 500 x 400 (mm) Suitable for Pedestrian, 62 Tonne. Fill out the sides of the soakaway with 150mm. How do I install a soakaway in my garden? Follow these 6 simple steps to install soakaway crates – both quickly and correctly: Step 1 – Create space. 50 each. Brett Martin Perforated Blown Socket Plastic Underground Drain Pipe More Options. Step 3: Determine the percolation rate. . £ 82. A soakaway crate is a plastic crate with a grid-like structure that allows water to filter through soil at a controlled rate, preventing standing water and pressure on underground pipes. Get It Tomorrow. The process is laid out in-depth in our how to build a soakaway article but essentially involves digging a large hole in the ground and stacking soakaway or attenuation crates within it. Then out a layer of your landscaping fabric across the surface. Quantity. 100% recyclable at the end of its lifespan. Our full range of Polystorm soakaway crates can be viewed here. co. Designed for heavy trafficked conditions which require shallow excavations and burial depths. Usually one cubic metre in volume below the inlet pipe. For more . £30822. The kit also includes 1 x 10m2 roll of white non-woven geotextile. Our Rainsmart shallow crates come flat-packed for easy assembly on site. 2m3 per crate) £36. 19m3 per crate. Septic Tank Hydro Crates Soakaway Crates Plastic crates to fill soakaway hole for a septic tank. Brand Rainsmart. Minimum soakaway drainage field distances. 37 postage estimate. 00 - $70. 4m in size. Get it Thursday, 28 Sept - Friday, 29 Sept. A soakaway is the name for a pit filled with rubble or hard core that helps water drain slowly into the soil around it. 5 The disposal of road runoff through soakaway systems is reasonably well established within Ireland. Features & Benefits: Polypipe PSM1A Polystorm Plastic Soakaway and Attenuation Crate. A soakaway solution can be provided as part of either our Permavoid system (a shallow geocellular solution), or our Polystorm system (a deep geocellular system), allowing surface water run-off to infiltrate into the ground, which would otherwise have been prevented by impermeable developments. We offer a full design service, please contact us at [email protected] experts will work closely with your team, to create small boxes or large crates that will optimize the shipping process of your products. The premium BioDisc® sewage treatment system is available in four sizes for all types of domestic applications. 3 58 - 60 Typical installation procedure - soakaway 5. An inspection chamber base is naturally the ‘bottom’ component that’s closest to the drain pipes. Our durable and robust crate will help to alleviate flooding by creating a structural void in. Office: 3908 Tennessee Ave. Stores a massive 240 litres; Open cell structure allows rapid dispersion of water; Cells can be nested reducing on site storage;. 19m3 per crate. It’s called the Bullet because it is so shallow, and only takes approximately 1 hour to install. This short video from the PBSL Group explains how best to connect plastic soakaway crates together. 71. 00 incl VAT. The Soakaway Crate, or at times referred to as a soakaway drainage crate, water block or aquablock, is a handy product in that it effectively replaces the debris infill in the soakaway pit. Leach Drains. 2m x 1. £545. Residential developments. Box 202. - Size: 3. 10. Hydrocell Options Choose from 0. Soakaway crates are a great invention that help to mitigate the risk of floods. Geocellular crate for soakaway (infiltration) or storage (attenuation) applications for surface and storm water. 15m from any building, and sufficiently distant from any other soakaway, including roof water. 00 incl VAT. For deeper excavations please seek specialist advice. Wrap the whole system in the membrane, including the inlet pipe to stop anything from getting inside the system. PLEASE NOTE - This video has been superceded, you can find the new video here:. Add to basket. Different jurisdictions require different permits. About RecoCrate soakaway crates. Plates simply click into place, helping speed up the system’s installation by up to 50. The crates are situated beneath the ground and are used to create an underground void space for storing rainwater. The most commonly used in the industry is: Soakaway Volume = Area x (Rainfall Rate/3000) For a standard 60m2 roof or driveway in the UK the calculation would be: 60m2 x (50mm/3000) = 1m3 volume This means you would require 5 of our CORE Water Crates to create a 1m3 soakaway. Plastic Soakaway Crates are now the favoured option in the UK for draining surface water runoff and preventing water damage and dampness to your house. Brand Rainsmart. You can opt for one of our popular cubic metre sets which comes with enough geotextile membrane to cover your tank or individual crates. As the crate structure fills, water begins to exfiltrate from the tank into the surrounding ground. Clark Drain D400 Cast Iron SW Badged Manhole Cover & Frame - 600mm x 600mm x 100mm. If the soakaway is to be installed under a driveway then expect it to take 2-3 days. • ACO StormBrixx soakaway crates: 2. 7 reviews / 4. Underground Stormwater Storage Plastic Soakaway Crate. The crates feature voids, allowing large volumes of water sufficient surface area to seep back into the ground. . A soakaway is the name for a pit filled with rubble or hard core that helps water drain slowly into the soil around it. The drainage system and water storage-permeation and filtration system along side the roads, parking lot, water storage and drainage for the ecological. First and most important - a septic tank soakaway drainage field is NOT a 'hole filled with stones or crates'! These soakaways are for ROOF WATER ONLY and are illegal for sewage effluent. This product can bear up to 62 tonnes and is 1m x 0. £4. CleverMade Plastic Collapsible Milk Crates - 25L, Pack of 3 in Stone - Stackable Storage Bins, Holds 50lbs Per Bin - Clevercrates are Heavy Duty, Collapsible Storage Crate for Multi Purposes. Recharging of local groundwater (if infiltration/soakaway application) Aerobic purification to improve water run-off quality Sustainable, cost effective management of the water environment Helping SuDS and planning approval The proven qualities and performance of AquaCell systems not only support the achievement of SuDS, but can also help. co. Stackability: Plastic crates can be stacked, which saves space. SOAKAWAY CRATES FOR DRAINAGE SYSTEM. Our RecoCrate range of soakaway crates are versatile lightweight modular cells with high void ratios which are used for creating water storage systems for a wide range of landscaped areas. Each Brett Martin crate measures 1200mm long, 600mm wide and. Soakaway Crates: Polystorm 61 tonne Polypipe Soakaway Crate - 1m x 0. Large net storage volume of 287 litres per crate (302. £518. £46. All soakaway crates should always be wrapped in non-woven geotextile membrane. : LY-M6841; Size : 640*450*410mm; Material : PP; Color : Black or Blue; Pressure Strength : 25-40tons/sqm; Working Temperature :-30℃ to +120 ℃ Apply Place : Road Drainage, Residential Area, Car Parking Lot, Golf Course etc; Weight : 8kg/module; Package : 680*410mm 8pcs/bundle. uk create new emailBRE Digest 365 is one of the most regularly used design guidance reports issued by the Building Research Establishment. Kitchen Appliances. The crates feature voids, allowing large volumes of water sufficient surface area to seep back into the ground. VAT £29. Geocellular attenuation or soakaway crates are also extremely versatile, which means they can be configured around site constraints. 01277 211141. 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 &. Versatility: Plastic crates are available in a variety of sizes and shapes, making them a versatile storage solution. 200 to 299. Access for inspection and maintenance can be facilitated by the inclusion of Polystorm Access and Inspect. Underground Drainage. 94' x 1. Roof Sealant. The performance of a soakaway is dependent on the shape and size of the soakaway, the surrounding soil’s infiltration characteristics and the depth to groundwater. It is also a highly efficient way to transport wastewater to a sewage treatment facility from your home. The condensate pipework may terminate above or below ground level. Then. Suitable for both attenuation and soakaway systems. DIY Soakwells. £14. 18. Fill with water to depth of 300mm. It can hold 0. 74 – 30. 88 Lowest Recent Price. 2 68 - 71 Fabrications 6. However, modern day technologies have allowed for the design of a specific type of soakaway system, a soakaway crate. It allows water to filter through it, and literally soak into the ground (away). The crate should be wrapped with the Geotextile Filtration Membrane provided. Preston, Lancashire. In this septic tank soakaway kit you will get: 1 x shallow dig bullet septic tank. 4m in size. , Blackstone, Virginia. Rainsmart Ellipse Soakaway Set Assembled with Silt Trap & Lid 1 Cubic Metre. View options. A) CRATE SYSTEM. £1,613. 95% void ratio providing greater water storage capacity with reduced excavation and disposal costs. It can hold 0. Under normal conditions, this would be sufficient to hold water from a roof area of. The CORE Water Crate is the perfect product for creating soakaways in residential and commercial projects. Cover. . This is because they have very poor levels of porosity and in many. In order for anything to soakaway in the ground, the ground needs to be able to drain. Lightweight and easy to handle with unique rounded corners. Rainwater soakaways are usually made from gravel or stone or even plastic soakaway crates. Lightweight recycled polypropylene structure. Soakaway Crates. bark as final layer. 300 to +. Wavin AquaCell units are a tried and tested modular technique for managing excessive rainfall and can be assembled to create an underground structure as either a. Add to basket. Cost effective, particularly when used as a hybrid, value engineered system. These include:Stormcell ® is a high-capacity, low-maintenance modular stormwater and surface water storage system that can be customised to suit shallow, deep or irregular sites. . Polystorm-R has been designed to provide surface water retention, surface water attenuation or surface water infiltration as a soakaway solution at a variety of depths in trafficked and loaded areas. Shipping calculated at checkout. Step 5 – Add Gravel and Complete the Soakaway. CORE Water | Soakaway Crates | Attenuation, Infiltration, Stormwater Retention Crate for Residential and Commercial Projects | Perfect for Flood Mitigation, Stormwater Management System Brand: CORE Gravel $15000 Flood mitigation with effective stormwater management Sediment prevention with 80gsm infiltration membrane Superior structural integrity See full list on diydoctor. 3 crates per 1m3) Polypipe Polystorm soakaway crate (5 crates per 1m3) Aquavoid Stormwater soakaway crate (2. £27. Cost effective, particularly when used as a hybrid, value engineered system. 84m 3 . Fit a plastic underground drainage pipe from the drainage channel or rainwater pipe into your soakaway, and attach a gully trap at the top end of the pipe. Stormwater Retention, Attenuation and Infiltration The Polypipe Polystorm Cells can be mainly used for rainwater Retention, Attenuation, Infiltration. Soakaway crates and rubble soakaway systems are methods of drainage for landscaping and construction projects. The tradesmen will likely work in pairs to fit a soakaway and shouldn't take any longer than a day in most cases to complete the work. Full drainage design suite (50% Discount) including 7 spreadsheets; Soakaways built in Clay Soils need to be carefully designed in order to operate effectively due to the low infiltration rate of most clay soils. They are only for rainwater and surface water soakaways. A further amount of a minimum of 150mm of the soil that was excavated can then be shoveled back in and firmly tamped down – this will minimise any depressions caused by ground settlement. Suitable for both attenuation and soakaway systems. The storm crates are buried beneath the earth, gravel and other permeable materials to create an underground void space, ideal for holding rainwater or surface water run-off. For soakaway crate for rainwater wholesalers, feel free to check our soakaway crate for rainwater list and find great items for your clients and their pets. Once the soakaway is blocked it cannot be repaired unless you either use soakaway worms or you install a new soakaway. 00 incl VAT. The PSM1A is a well-established product in the underground drainage. We supply our Rainsmart crates either fully assembled or flat-packed for on-site construction and. A soakaway is a hole dug into the ground that is filled with coarse stone and rubble or plastic crates. Shop our range of Soakwells at warehouse prices from quality brands. Soakaway Crate (81 products available) Environmental 60T Pp Crate Plastic Collector Garden rainWater Harvesting System module Soakaway Crate $60. These plastic crates have been designed as an alternative to gravel or other free-draining material used to fill a soakaway trench. Laying of pipe/crates membrane and gravel etc. 100 depth below invert = 1. The soakaway should be backfilled using 150mm of sand or pea shingle all around the sides and above the top of the crates. Dimensions. line the hole with geo fabric. Full Drainage Design Suite. 45 reviews. Top and side inlets fit 32 or 40mm pipe. Add to basket. This product can bear up to 62 tonnes and is 1m x 0. The amount of water that can be disposed of by a soakaway within a specified time depends mainly on the infiltration potential of the surrounding soil. Step 6 – Replace any ground that was removed. Aquacrate Future Build Supplies Ltd 6 x 190 Litre Storm Crates for Soakaway Attenuation, Underground Storm Water Drainage 1000 x 500 x 400 (mm) Suitable for Pedestrian, 62 Tonne. Laying of pipe/crates membrane and gravel etc. Dialogue with BC for detail and internet for crates (or find a friendly milkman. Sort By 100mm x 100m Perforated Coiled Drainage Pipe. 5m deep in a lower part of your garden and preferably at the bottom of a slope. 216 cubic meters). Steps: To build a basic stand-alone soakaway, dig a pit in your soft turf no less than 1m2 and 1. It is a crate-like structure made of interlocking pieces typically made of plastic or concrete. However, modern day technologies have allowed for the design of a specific type of soakaway system, a soakaway crate. Geocellular attenuation tanks or attenuation crates are also extremely space efficient, with a typical surface water holding capacity of 95% or above. Add to basket. * * You can view all the datasheets for the range here:. Product Description. Soakaways should be constructed in a circuit to make a continuous loop. £545. Can be used as part of an intelligently engineered hybrid system in. The most commonly used in the industry is: Soakaway Volume = Area x (Rainfall Rate/3000) For a standard 60m2 roof or driveway in the UK the calculation would be: 60m2 x (50mm/3000) = 1m3 volume This means you would require 5 of our CORE Water Crates to create a 1m3 soakaway. 81 £294. Hole 300mm square to depth of 300mm below where pipe will go into the soakaway. Soakaway Crates in Clay. It can hold 0. 5 x 5m Geotextile Membrane; 16 Clips; 8 Shear Connectors Percolation test procedure for surface water soakaways. This product can bear up to 20 tonnes and is 1m x 1m x 0. . Complete crate weighs 9kg. This is measured below the pipe invert so you' generally dig 1. A traditional soakaway will typically drain between 30m2 2and 300m of impermeable area to every 1m2 area in the base of the soakaway (ie a ratio of between 30:1 and 300:1). FloPlast 110mm Underground Drainage Bend Double Socket 45 - Terracotta. They are only for rainwater and surface water soakaways. Sort By: Show: RainBox 3S Attenuation Crates (Pack of 10) Soakaway crate sizes can vary, but a common size for residential use is around 1m x 1m x 1m. Add to basket. With its dimensions of 1200mm x 600mm x 347mm, it can hold up to 0. Add to cart. In this episode of Two Storey Extension, Tony takes you through the process of Digging Soakaway Drains and Footings. You ideally want to use permeable paving or. The crates are designed to handle large amounts of roof and surface rainwater in both commercial and domestic properties. General yardstick is 1 cube of soakaway for 30 sqm of roof. RainCatcher’s cells are 1200 x 600 x 420mm in dimension and each holds a capacity of 300 litres (95% void), taking up less space for higher volumes of water. Soakaway crates help to control the level of surface water, particularly in areas that are prone to flooding. 300 to +. We understand the unique needs of our customers and incorporate innovative, yet simple design features to protect your valuable goods and equipment. Brett Martin Soakaway Crates; Graf Soakaway Crates; View All Soakaway Crates; Flood Defence. This water crate is easy to assemble and can be installed beneath gardens, pedestrian areas and driveways with light traffic. Underground Drain Pipe Double Socket PVC Pipe Coupler - 110mm. £27. Bore a hole 150mm in diameter with an auger, to a depth of one metre. so neater hole means less gravel. 5 Per m3. 50 Save 25%. We now stock a range of sizes to meet your drainage needs. This protects the soakaway by preventing any soil or sand particles from entering the crate structure, keeping the void clear for rainwater storage alone. visi. The base should be a 100mm layer of sharp sand, and surrounding the crates there needs to be a 100mm of gravel and a 500mm layer above. Silt / Oil Interceptor Tank - Black. Soakaway crates, tunnels, etc. An 800 Litre Soakaway will cost between £1,000 and £1,100, while a 950 Litre Soakaway will cost between £1,100 and £1,200. This has to be assumed for initial calculation purposes. £518. 00 each. 83 per M. AquaCell NG is designed primarily for landscaped. 20 Tonne Loading. In modern times, soakaways which give much more benefits have been constructed using modular water storage cells called soakaway crates due to their resemblance to old-style plastic milk crates. £545. Superior Shipping Products. 5 per cubic metre. Cast Iron Soil Pipes; Plastic Soil Pipes; Plastic Waste Pipes; Stainless Steel Pipesseptic tank soakaway cratesyou looking for a septic tank soakaway product that is easy to ins. TNW3000 – Protection Fleece Non-Woven Geotextile 2m x 50m TNW3000 – Protection Fleece Non-Woven Geotextile 2m x 50m quantity ADD Save for Later RemoveGet your septic tank or treatment plant emptied - ok, so this might be the only easy solution, but it might just do the job. Stormwater attenuation and infiltration/soakaway crates . (When calculating the size of a soak pit, the volume of water storage available for a rock-filled hole is 0. Kitchen Gadgets. 11 inc VAT. Soakaway crates help to remove some of the burdens that surface water and run-off put on drainage systems by providing an alternative drainage solution. Backfill and compact the area. EJ Cast Iron Hinged Pedestrian Gully Grating & Frame D400 - 420mm x 420mm. 5m x 0. See more ideas about drainage, drainage solutions, damp proofing. 00 incl VAT. To figure out which size you need, the first step is to calculate the area of the roof that will discharge into the soakaway. 9,8.