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 Easy to use channel to channel locking system with concave grid for maximum flowshallow drainage channel  Plastic Construction

6 x Black channel with galvanised Steel Grate Ultra Low Profile Shallow Flow Drain Plastic Grating 50mm Deep x 1m Length x 125mm Width Drainage Channel suitable for Garden Patios and Driveways £59. With a broad knowledge of expertise in rainwater management, the HAURATON team can support your project from the early planning stage right through to completion. 5% slope built in but can be manufactured with any slope specified. 2. With one length of channel and a grate, you can manage waterflow from your lawn, landscaped area, downspout, patio or walkway. Talk to us today on 0800 372 465. each. VAT) Quick view. 53 Inc. The drainage channel MEARIN PLUS F is particularly suitable for multi-storey car parks or underground garages, especially in the ramp area, due to its shallow height. 12. The benefit of this drainage channel is it can relieve hydraulic pressure within the ground and drain waterlogged soil. Our portfolio includes a variety of channel and grate assemblies, including pedestrian and driveway options, as well as monocast and heavy duty, high capacity drainage systems. Made in Australia, from 100% recycled polymer, EasyDRAIN Compact channel is a sustainable and eco-friendly drainage choice for homeowners and installers. Stainless Steel/Marine. By collecting run-off and dispersing it over a large area, it acts as a gutter for your ground. Channel drains are most commonly used on driveways, patios, pavements, and other areas where water can pool and cause problems. Channel drain easily connects to underground drainage systems thanks to its 3- and 4-inch outlets. ABT Permavoid is a modular interlocking plastic system designed for use as a combined drainage component and sub-base replacement. When laying the concrete base, make sure it is level with enough space for the channel drainage unit. In todays video we show you how to fix drainage issues on a concrete slab. Designed for doorways up to 1000mm, but multiple channels can be run. VAT. 1 m, which includes the level of the extended drainage collector pipe, depth of discharge, and safe margin for the free disposal of the sumps effluent. Add to Cart. Roads will affect the natural surface and subsurface drainage pattern of a watershed or individual hillslope. Each order. Chapter 4, Subsurface Drainage, contains criteria for plan- ning ditches for use in subsurface drainage of agricultural land. Shallow Polydrain Channel Drain System . The Swiftdrain 600 starts at $60 per linear foot with non traffic rated grates. 5. Overall, 11 out of 24 reaches of the surface drainage channels were required to lower the bed level. 00 (inc. The speed or celerity of disturbances in shallow water is given by c = (g Dh) 1/2, where D h is the hydraulic depth. 4-3/4" Wide Shallow Linear Trench Drain System. 11% Mail-In Rebate Good Through 11/22/23. When the pipe is connected, level the area where the drain is going to be laid. surface drainage system will therefore minimize this type of damage. Add to basket. Featuring Disruptaflow linear bar grating, the innovative six-bar design blocks the flow of water and prevents it from crossing the grate. There are different types of shallow relief drains, and they are defined by the shape of their channel. Chapter 4, Subsurface Drainage, contains criteria for plan- ning ditches for use in subsurface drainage of agricultural land. To connect to 4 in. LiteAqua 100 Shallow 1Mtr Channel 48mm Depth – B125 Ductile Iron Diagonal Slotted Grate £ 37. Channel Drainage. 02 inc. Designed in accordance with EN 1433. ACO Eyeled Lighting Cable Splitter - 300mm x 300mm. In Stock. The bed level of an open drain collecting flow from field pipe drains should be such as to allow free fall from the pipe drain. The flushing box allows access to the installed 325 sub-surface drainage system to enable jetting equipment to remove any silt build-up. They are suitable for both domestic and commercial use. . Thanks to its versatile design the Mufle 4All Shallow Drainage Channel A15 can be used in a number of settings, from residential or commercial projects to landscaping or industrial projects. Menu . Slope. Shallow depth trench drain system, available in 100mm, 200mm and 300mm internal widths for both general purpose and heavy duty applications. #1 Home Improvement Retailer Store Finder Shallow trench drains are used for site conditions with depth restrictions. Add a 50mm layer of bedding aggregate to the bottom of. A surface system is the only means for drainage improvement on soils that absorb or transmit water slowly. 584All Shallow Channel x 1m Galvanised Grate. . 3. As you dig the trench you need to allow for a fall of around 5mm. is a shallow profile. Humes supply a wide selection of channels and grates for surface drainage that meets. The resultant high precision monolithic trench is faster and easier to install when compared to traditional. According to ABT, Inc. 1. Surface Water Drainage. Shallow Concentrated Flow: After approximately 100 feet, sheet flow usually becomes shallow concentrated flow collecting in swales, small rills, and gullies. Offers flexibility as each section of channel can be snapped together for longer runs or divided down to lengths as short as 4" for smaller, interlocking sections. 2 This Standard provides information on the hydraulic design of surface water channels and should be treated as such in the design of new schemes. The system will function only as well as its outlet. For use with vinyl and other flexible sheet material Stainless steel clamp ensures watertight connection, access to channel and outlet is easily achieved without disturbing the floor covering. Since swales are not as deep as ditches or channels found in many surface drainage systems, they are a more subtle. 74. 99 Inc. Code: DCLP708. 1-20 of 22 items. Channels, trench drains, sump units, gratings and accessories. When water hits the channel drain, it's sent off in another direction, well away from the house or garage. 16 Surface Pond Design Requirements Page 17 4. Collection Select your store. Roads will affect the natural surface and subsurface drainage pattern of a watershed or individual hillslope. Using our ‘Complete the look’ range, designed to be used with ACO’s best-selling domestic drainage channels ACO HexDrain® and ACO RainDrain®, you can pick from. Grates have non-slip textured surface; 3 bottom outlets in every channel drain; No clips or screws required to assemble; CLASS B: Loads of 61-175 psi. Sizes: 500 x 550mm – (14”x 22”) and 250 x 550mm – (10”x 22”) Water drainage GratingBuy great products from our Channel Drainage Category online at Wickes. Our HexDrain installation tutorial shows you how easy and quick it is to prepare and install ACO HexDrain drainage channels and accessories. high, and 4 ft. 58 A low profile drainage channel is an effective way to get rid of standing water while the lengths of channel themselves are more shallow and therefore are easier to install. S. corrugated pipe or MOLE-Pipe - install RELN part 000225 (4 Corrugated Pipe Adapter) To create a water-tight connection, apply RELN Part 000309 - 83 ml. When depth restrictions require a shallow channel PolyShallow offers a practical and economical drainage solution. Model: DCLP707. long; length can be cut to size with a saw. The ACO Building Drainage Deckline 125 galvanised steel channel drainage system is a further development of our current highly successful Deckline channel solution. An open channel is a conveyance in which. Drainage channels (3) End caps (1) Linear drainage accessory (1) Brand. Features. We offer solutions in surface drainage channel systems for all kind of needs in polymer concrete. Next, a long channel drain is placed in the trench. As part of a complete drainage system, channel drains collect and convey water to drain pipes, which carry the water downstream to discharge with a pop-up emitter or to percolate into the ground with a dry well or. Chapter 860 addresses the design of small open channels called roadside channels that are constructed as part of a highway drainage system. Hynds Skid Ring Joint Jacking Pipe SystemChannel drains, also known as trench drains, are long, narrow drains used for surface drainage of flat areas such as hardscapes. 1. The success of mole drainage depends on the formation of cracks1. Channel drainage is a key point in the management of surface water intercepting and conveying water to the next phase of it’s journey – a journey that has to be carefully and properly managed through cleaning, infiltration, attenuation and release. PolyDrain Domestic Low Profile Heelguard Channel Drainage (Class A15) A high quality, high strength shallow channel drainage system for low profile linear draina. A field drainage system can be a surface drainage system (to remove excess water from the surface of the land) or a subsurface drainage system (to control the water table in the soil). 8 x Black channel with galvanised Steel Grate Ultra Low Profile Shallow Flow Drain Plastic Grating 50mm Deep x 1m Length x 125mm Width Drainage Channel suitable for Garden Patios and Driveways £79. Especially in our current climate, where rainfall is expected and can be unpredictable. The basement floor must slope toward a channel drain, so the trench is usually dug at the lowest point. The shallow ditches discharge into larger and deeper collector drains. The grates allow water to enter the channel from a large surface area, facilitating quick water intake. 1. B. 1. A channel drain also has many benefits as to why you should get one installed in the first place. It offers a cheap, elegant and simple solution that can minimise costly underground pipework. The shallow drainage channels, also known as shallow trench drains, is a type of drain used to collect and convey water from small areas such as patios, decks, and driveways. Add to Cart. Drainage Channels are often called Linear Channels or Channel Drains and are an easy and effective way to clear surface water away from an area. 60 ex VAT £81. The shallow drain is used for storm water drainage for shallow water drainage where vehicles can pass over it and is used on the road itself or going across the road. 2 Hauraton Top X (2 MB) Related products. £. Drainage channels are designed to be used to provide drainage solutions for surface water on driveways and patios and around garage and conservatory entrances and exits. Add to Basket. Our linear drainage provides a uniform plain of fall for surface water removal, allowing the use of larger format, luxury tiles. The destructive power of flowing water, as stated in Section 3. 3-inches to 5-inches (7. Whatever surface drainage project you might be working on, we will help you to ensure that you have everything that you need to get the job done right. These are often used in driveways or when building patios and are very easy to install. To properly specify our shallow trench drain systems you don’t have to do anything. View all: FloPlast Drainage Channels. Our grated channel drain systems provide outstanding drainage as well as contribute to the aesthetics. Channel materials include: Fiber Reinforced Concrete. Figure 861. those of the local community. Showing 1-36 of 47. It prevents the risk of any interference with underground services while also reducing excavation costs. The velocity for newly constructed channels with drainage areas in excess of 1 square mile must meet the stability requirements specified for the CPS Code 582, Open Channel. NDS Micro Channel Drain Systems are engineered with recessed grate openings and improved runoff capture for residential applications. They function through gravity, needing nothing more than nature to take its course. The road drainage system consists of two parts: dewatering and drainage. Add to Cart. DrainTEK Outdoor Low Profile Linear Grate - Wedge Wire / Heel Guard Style - 120mm - Matte Black - Custom Length and Outlet. Channels around the iris allow the fluid to drain away. Watch Video Drainage. The new shallow channel for balconies, terraces and low height applications is Versatile, Practical and Easy to assemble. The V-shaped drainage channel base aids a self-cleansing flow, and a tapered throat helps prevent blockages. 5 Tonne. V-shaped channels are not efficient for conveyance of high flows and are generally designed for collection of intermittent. The channels have different widths, profiles and grating options, and can be used for slabs, garages, basements and other applications. Rain Bird Low Profile 5” Channel Drain is our in line drainage solution perfect for sidewalks, driveways and pool decks because it is lightweight, durable and UV stabilized. If you’ve already dug the trench for the drainage pipes, then all that’s left is connecting the drainage channel to the pipes. Set into the ground at surface level to drain water away. PDX is available in 7 different interior widths from 6” [152mm] up to 24” [609mm] with depth increments from 0. Open drain. Compact Series 5. 5” overall), the 500 Series’ polymer concrete channels are shallow enough to be used in raised concrete platforms. For surface drainage Homes with open drainage systems typically have higher heating and cooling costs. Polycon is a leader in the design, manufacture, and distribution of channel drainage systems. Chapter 3, Surface Drainage, deals with small field ditches. Wishlist. Build the channels so that they have side slopes of 6 to 1 or flatter or as recommended in local guides if they are to be crossed regularly in farming operations. Cross Sectional Diagram of a Two Stage Drainage Ditch. With the trench fully dug, it is time to connect your polypropylene drain to the channel drain. EUR 5. Channel drains have several outlets at the sides and bottom for connecting to pipes. 93 inc VAT. 32 Inc. Install The Piping. Surface drainage systems, when properly planned, eliminate ponding, prevent prolonged saturation,. Drainage refers to the method of removing surface or sub-surface water from a particular area. 99. They offer an excellent balance between durability and weight with asbestos. Step 3. Provided in a range of capacities and with a choice of styles and load bearing limits, Marshalls has a concrete drain channel that will meet any scheme’s needs. Look out for maximum point load (weight. Our Micro channel drain sections snap together easily to make installation fast and simple. Blade the spoil to the lower side of the channel to form a low,8. . 7 ACO BuildLine Grate hydraulics A grate fails hydraulically when water bypass occurs. 1. Master Planning Parks of All Sizes. Use a string line to indicate the finishing height of the grate, which should be 2mm lower than. Field surveys of road drainage concentration at three sites in the western United States are used to test simple models relating channel initiation and shallow landsliding to ground slope and contributing area thresholds. Combine interlocking trench drain sections to create runs of almost any. x W 4. 43 £5. A low profile drainage channel is an effective way to get rid of standing water while the lengths of channel themselves are more shallow and therefore are easier to install. Types of surface drainage systems Ditches or open drains. Clear your planned area for the trench of any concrete or bricks so there is a place for the trench to go. Installing a channel drain starts with a narrow trench cut into the concrete or asphalt. Blade the spoil to the lower side of the channel to form a low,Homes with open drainage systems typically have higher heating and cooling costs. Rain Bird Standard 5" Channel Drain is the complete professional drainage system. Patented flying buttress design provides load-bearing support from both sides as well as underneath the channel. 38. Specialists in. 1 – Introduction . External Width: 125mm. 58 £ 59 . Allproof’s Polymer Concrete channel drain has been designed for commercial applications. By doing so, water is collected with. 85 ex. Surface drainage is the removal of excess water from the surface of the land. The Mufle 4All Shallow Drainage Channel A15 is a plastic drainage channel that is specially designed to be used in shallow environments where other drainage channels might not fit. The primary advantage of closed drains, and the reason they are preferred by engineers and administrators, is that they don’t take up surface space. 1). The pre-sloped commercial trench drain line is offered in 2″ , 4″ , 6″ , 8″ , 10″ , 12″ , 18″ , 24″ , 36″, and 48″ widths. An overall depth of 70mm can be achieved with the DD1, however for these applications we would recommend a custom stainless steel channel and grate solution. The shallow depth design can accommodate the most challenging applications around the home. The hold down feet and pipe cut–outs make it simple to install. It shows the field (or internal) and the main (or external) systems. 3. Standing surface water is not only a slip hazard—it can lead to mildew growth, concrete staining, and costly damage. The main inputs are the labour to excavate and move material as well as to analyse soil, precipitation and runoff conditions. 7. £5. 37. The intensity attribute refers to how fast a given. ~120 feet of Firestone EPDM PondGard rubber geomembrane liner, ~$450. 95. The internal drainage of most agricultural soils can prevent severe waterlogging (anaerobic conditions that harm root growth), but many. 5. Delivery. This is often due to: • The wide roadway sections, flat grades in longitudinal and transverse directions, shallow watercourses, and absence of side channels. These are often used in driveways or when building patios and are very easy to install. Pour 8 inches of gravel into the bottom of your drainage trench, atop the landscape fabric. Jan 30, 2021 - Explore Foster Avor's board "Precast Concrete Drainage Channels" on Pinterest. Use large-to-medium-sized rocks, crushed stone #3, or 3/4 inch gravel. 87 postage estimate. Channel drains are available with various material top grates. Surface Drainage. To create the channel you would have to cut 2 parallel lines 2-3 inches apart and then chip out the concrete between. Shallow drainage channels are commonly used in. The shallow drainage pieces of a threshold drainage channel system are available with black or original Aluminium Grating 1m in length. A field lateral is the principal ditch for field or farm areas adjacent to it. 05 of 12. VectorDrain® is an ADA compliant slot drain channel with a narrow profile and clean lines using an underground PVC system for drainage. Because of their low-profile design, the Compact Series Modular Trench Drain systems are perfect for low water flow areas in landscape water drainage projects. € 58. Components. Creating diversions for surface water via precast half channels or box format. NDS Channel Drain systems are an effective and popular solution when perimeter drains are needed for hardscaped areas. They also reduce the risk of children playing in or falling into polluted water. Use as bottom or side outlet for 5" Pro Series Shallow Profile Channel. Spee-D Channel Drains are 4-3/4 in. If you need a shallow trench drain it can be as shallow as 2″. Reln 600mm Stormwater Pit Square 660mm Deep Base Only. Grassed Channel . If you're an engineer or. 5 feet. Brand new | Business. 5 feet. Add to basket; LiteAqua 100 Shallow 1Mtr Channel 55mm Depth – A15 Composite InterLock Grate £ 5. £65. . Using 100%. $127. Surface drainage is the removal of water that collects on the land surface. French drains consist of a linear trench which hosts a perforated pipe encased by free draining gravel. River Rock Can Be Used To Fix Other Drainage Options. The high quality ACO RainDrain channels interlock, allowing for quick and easy installation. Channel drainage is an essential component for almost every drainage system from landscaping right up to airport runways. 20% VAT) ( £8. Dimension(s): 19-11/16" L x 8-1/4" W x 4-1/2". ADD. sewer and drain pipe. This mound — called a "berm" — prevents runoff water from continuing its downhill flow. The Althon channel drainage range of surface water drainage products caters for all types of construction site circumstances. Most Drain Pipes come in 3 inch, 4 inch, and 6 inch although larger size is available for industrial applications. Product Code: 902852. Buy it now. Trapped gullies (round) eliminate odours through the use of a water seal while untrapped gullies and silt boxes (square) are used for collection of surface water. A shallow drainage channel is a type of drainage system that is designed to collect and channel water away from a specific area. Zurn Z884 4" [102mm] wide trench drainage system. 50 incl VAT. Channel drains, also known as trench drains, are long, narrow drains used for surface drainage of flat areas such as hardscapes. ACO HexDrain is a. The benefit of this drainage channel is it can relieve hydraulic pressure within the ground and drain waterlogged soil. The destructive power of flowing water, as stated in Section 3. We supply trade quality DIY and home improvement products at great low pricesA channel drain also has many benefits as to why you should get one installed in the first place. Excavation for open drain. When looking at different types of surface drainage systems, here are four main possibilities and some of their subgroups. This is because you have to activate both the Grand Lift of Dectus and the Grand Lift of Rold to. Use a mallet to gently press the channel drainage into the trench, before adding backfill or concrete around the channel run. Visit our website to learn more about micro channel drains. 2. The world’s most popular modular trench drain system. Manufactured in stainless steel, these products are the drainage channels for residential, retail and commercial processing plants. What are channel drains? Channel drains are occasionally referred to as linear or Aco drains – and the chances are, you’ve probably walked or driven over numerous channel drains in the last 24 hours. ULMA offers a range of shallow drainage channels for areas with height limitations, pedestrian use and light traffic. - •Classy 304-Grade Stainless Steel Shower Drain Channels in multiple designs. Always mark a line 3mm below where the finished surface will be. 9" depths. We understand the importance of better utilizing one of our planet's vital resource, water, and are working tirelessly to improve its utilization, collection and reuse. Check out our wide selection of frames and grates for all applications. Trench Drain Compact 3-Pack 40-in L x 5-1/4-in W Drain in the Outdoor Drainage Accessories department at Lowe's. Align with providing an aesthetically pleasing finish to the drainage channel; these grates help to keep debris from clogging any part of the system. shallow channel drains CIVIL - S Polymer concrete shallow drainage channels for heavy duty. They have a high load-bearing capacity and they do their intended job inconspicuously. . Square Catch Basins; Round Spee-D Basins; Catch Basin Universal Outlets; Catch Basin Grates; Dry. each. Easy to install as the required depth to dig down is very shallow. Shallow Polydrain Channel Drain System Standard Channel Drainage System Clark Drain B125 Drainage Channel Clark Drain C250 Channel Blockslot B125 Channel Drain Shallow Channel Yard Drain Unit Galvanised Slot Drain Deck-A-Drain Dek-Drain Channel Drainage. The system has exceptionally high compressive strength due to its engineered co. 20 Easements for Surface R/D Facilities Page 20Plan, design and construct a surface drain, main or lateral to comply with all Federal, State, Tribal and local laws, rules and regulations. 2, increases exponentially as its velocity increases. 2. 99Inc Vat. 1. NDS Spee-D Channel Drains and Grates 10-ft L x 5-3/4-in W x dia Drain. A channel for conveying storm-water runoff; usually lined with concrete, grass, riprap, or the like, to reduce erosion of the channel. Galvanised Steel Removable Grid Supplied. MEALINE S Drainage Channel with Galvanised Slotted Grating 1m - A15. 95. ACO MultiDrain M100D - 135mm x 150mm x 1000mm. All SAB drainage Channels comes equipped with a series of lateral and lower preset connections for pipes, each preset connection has an opening that can easily cut on site. It is a high quality steel reinforcement for cast concrete applications. Then go for the perfect finish. Surface drainage utilizes waterways, ditches, and other means to help direct excess water off a field and into larger streams and rivers. This Old House landscape contractor Roger Cook helps a homeowner solve a driveway drainage dilemma. Humps and Hollows. We will try to find the right answer to this particular crossword clue. reduce velocities, protects the channel from erosion, and acts as a filter to treat stormwater. These resources will be invaluable later when the ditches have to be re-shaped or the channel re-graded. The Shallow Invert Channel is fully manufactured from stainless steel and is available in grade 304 & 316L. Product Code: 903578. Open drain. - via an existing manhole or existing inspection chamber. NDS Pro Series Channel Drains are lightweight, but feature side ribs and thick channel walls for added strength. 6000 Series Shallow Profile Slot Drain < Shallow Profile Slot Drain is a cost effective surface drainage system that is available in stainless steel. Drainage. SURFACE DRAIN, FIELD DITCH CODE 607 (ft) DEFINITION A graded channel on the field surface for collecting excess water. $0. The Kent Invert Shallow Drainage Gully takes all 25mm deep gratings offered by Kent Stainless including civils. Application. ADD TO CART. A crack may not be immediately visible at first, but will eventually become visible ov. Length: 1000mm. Water is carried into the outlet by main drains, which receive water from the laterals. It combines line drainage with point drainage by using an open-sided drainage channel to collect and convey rainwater to drainage points with a raised or suspended deck structure. ACO offer a range of stainless steel drainage products to be installed in both stormwater and wastewater applications in buildings. Low profile drainage channels can solve such issues and provide effective water management for your project. Silt Boxes come with one hole tapped out, the remaining three can be tapped out if required. Point drainage. drains, grates, and surface water management solutions in the industry. The NDS Pro Series is a lightweight Channel drain system with interlocking joints, so connections are made quickly and easily. A support bar is recommended in C250 and D400 applications. 1. 4. Vodaland designs all trench drain channels, including stainless steel trench drain channels, to be connectable to one another via male-to-female connections. There are 4 ways to connect new drainage to an existing system:-. Continue to 5 of 12 below. £19. Trench or Channel Drain System Cost. We manufacture shallow trench drains starting at 2" deep. When rainfall or runoff leave standing surface water on your driveway, patio, or courtyard, the water needs a better way to drain. Performing a similar function to french drains, surface drainage channels catch water running off a surface and divert it to a collection or disposal point. 75″ deep interior (2. ACO Deckline125 Level 50mm Invert End Outlet Channel Drain - 1000m. Installing driveway drains alleviates standing water that causes siding to rot and damage to foundations. Stormwater Drainage Manual to show that the size of the proposed drainage systems is adequate for the rain water from the site. Press the guttering into the wet concrete to leave a clear imprint. With our BG-FILCOTEN® mini channel, there’s no compromise on quality or durability. Such systems are used primarily in flat areas having poor natural drainage to remove water that collects on the land surface when the rainfall rate exceeds the. long; length can be cut to size with a saw. Drainage channels work by removing surface water away from a given area. 9mm) opening, PaverGrate® is both ADA and Heel Proof. 16. This publication contains information on guidelines for agricultural drainage in British. This allows them to collect water more efficiently. A decent little stream of water comes in the basement where floor (slab) meets wall in a heavy sustained rain. 70 £ 11. Discreet Drainage CHANNEL For Architectural Pavers. W x 3. 12 inc VAT Was: £0. 72 to EUR 387. At suitable points along. 77 GPM per foot, UV inhibitors. Surface drainage systems, when properly planned, eliminate ponding, prevent prolonged saturation,. Hence, it was required to lower the bed level of the surface drainage channel from 2. The unique materials mean that Concrete Canvas is used as an eco-friendly concrete drainage ditch solution to support a range of sectors and community projects. Our portfolio includes a variety of channel and grate assemblies, including pedestrian and driveway options, as well as monocast and heavy duty, high capacity drainage systems. Road drainage design has as its basic objective the reduction and/or elimination of energy generated by flowing water. The width of your trench should also be wide enough to fit your French drain in, as well as at least 25mm either side. M100K Linear Mini Drain. Such systems are used primarily in flat areas having poor natural drainage to remove water that collects on the land surface when the rainfall rate exceeds the. 99 Inc. We also offer a variety of additional drainage grate materials to suit your project. We also offer a variety of additional drainage grate materials to suit your project. FILCOTEN light NW100 Mesh Grating B125 x 1m. Drainage areas are to correspond to points of concentration/design as example; 1) where off-site runoff enters the site (street, channels, etc. View all: FloPlast Drainage Channels.