Company registration number 02992960 - VAT number GB 395 9417 96. N. Speak to the market leaders in slot surface water drainage systems. Fields marked with an asterisk (*) are mandatory. All products are lightweight, durable and non-corrodible. Download. With a life expectancy of 50-100 + years, 100% recyclable at the end of their long, useful lives they offer an eco-friendly, low maintenance and sustainable drainage system option. Harmer Detail outlets are precision cast in aluminium silicon alloy LM6 to BSEN 1559:1997. 5) Uniclass CI/SfB G581 DRAINAGE SYSTEMS. Harmer Aluminium Shower Floor Outlets are precision engineered to establish the highest possible performance standards for versatility, choice and durability offering architects, specifiers and consultants exceptional benefits. All calculations are to BS EN 12056 based upon input data. Alumasc’s Skyline and Rainwater products are available in plain mill finish or polyester powder coated. Flat Roof Calculator. The innovative galvanised steel system is manufactured in Germany using the latest in material and manufacturing technology. A section dedicated to help support your DIY/Installer needs. 5mm thickness channel. It also estimates the cost of purchasing a given amount of gravel. 50 incl VAT. Rainclear Systems is an agent of Alumasc Building Products Ltd. (1 ft³ /min water drained through a 1 1/4" diameter pipe). Can provide an all aluminium eaves/soffit solution. The core is perforated to allow the excess rainwater to flow into the underside and away through the 40+FS to the outlets. Rainclear Systems is an agent of Alumasc Building Products Ltd. g. Use our rainwater drainage calculator to calculate your property's flow requirements or ‘flow capacity’ of the gutters you're considering purchasing. Modular Channel and Gratings for use in unfinished floors such as factories, plant rooms and service areas. Download. Cast iron, galvanised steel & aluminium hoppers. FLAT ROOF DRAIN INSTALLATION MANUALS - more roof drain calculators & tables ;. Gatic. Floor Drains. These calculators are based on corrugated polyethylene pipe. Learn more today at Alumasc Water Management Solutions. 0 on 68 votes . 1671. Drainage Software Informer. Made from 100% recyclable aluminium. Side bars and folds are made so that the selected grafting fits flush with the show edges. Example: Roof area is 300 x 500 ft; 300 x 500 = 150,000 sq. Calculate total roof area. We are delighted to introduce two new members of staff to the Alumasc team - Adam Foley and Jordan Wilkinson. Eco-Friendly. High capacity gutters for traditional or modern buildings. AWMS International brings together all five brands for the international markets with focus on Gatic, Harmer & Wade in key markets including America, the Middle East and Europe. Grow operating margins through new product introductions, improving customer service and operational efficiency. On-site handling and painting are the responsibility of the contractor, andTo regulate the movement of water and protect against dirt and grit penetrating the joints between insulation boards, a water flow reducing layer (WFRL) should be placed on the insulation layer; to assist the flow of water to drainage outlets. 0) This formula yields the required drainage capacity in gallons per minute (GPM). MADE IN THE UK. If you have attempted to log into the website with an incorrect password 3 times, your account will be locked. Virus-free and 100% clean download. Harmer Roof Drainage Roof Outlets, Roof Channel Drains and Raised Deck Supports wealth of information on all aspects of Harmer Drainage and compatible products. co. uk. John Hemphill posted images on LinkedInRain to drain solutions that set the standard for urban water management. Displays several design modules for each design issue, and helps fixing them. When choosing a roof outlet take into consideration some of the factors; medium & deep sump and parapet & balcony outlets. Total Drainage Capacity = Roof Area (in square feet) × Rainfall Intensity (in inches per hour) × Drainage Efficiency (a coefficient typically between 0. Jubilee Modular System. 318 if using imperial units, C is the roughness coefficient of the pipe material, R is the hydraulic radius (cross-sectional area divided by perimeter), and S is the slope of the pipe. In this equation, k is either 0. Checks the capacity of drain tile on existing drainage systems. Harmer Cast Iron Roof Outlets. Rainwater Drainage Drawing tool integrating Quantities Schedule Eaves Drainage Gutter sizing and pipe calculator for Cast and Contemporary gutter types roduct Literature, DWG files and application specific NBS Specification Clauses. The term Vari-Level refers to the fine adjustability of the height of a grating or access cover above a body; this feature enables installation exactly at finished floor level by rotating the grating or access cover. 5) Uniclass CI/SfB G581 Technical Brochure Harmer Roof Drainage Roof Outlets, Roof Channel Drains and Raised Deck Supports . Heritage is a comprehensive range of traditional gutter profiles , round, square and rectangular downpipes and all associated fittings and accessories. Harmer and Wade lead the Food, Drink and Kitchen sector with a range of integrated products that provide a complete hygienic floor drainage solution. Roof. Free next day delivery on Rainwater Hoppers & Metal Guttering from Rainclear Systems drainage supplier. First, figure out the diameter of the pipe you are working with. Double Inspection Chamber - Rectangular. Click here ️ to log in 🔒 The Alumasc Water Management Solutions' Calculator allows Architects, Specifiers and Engineers to design and quantify all the Drainage. Gatic. Contact us here. The roof drainage outlets and rainwater downpipes are calculated based on the design principles for gravity drainage systems established in SS525:2006 Code of Practice for Drainage of Roofs. 5 inches to 8 inches in diameter. Have you seen our new and advanced drainage Online Calculator yet? Our dedicated platform allows you to calculate the drainage requirements for your project…oof Drainage Calculator linked in to local rainfall data Rainwater Drainage Drawing tool integrating Quantities Schedule Eaves Drainage Gutter sizing and pipe calculator for. Product of the Day is GATIC Slotdrain from Alumasc Water Management Solutions, a range of innovative surface water drainage channels that can be specified for every location 1 Alumasc Drainage Calculators, Free Download by Alumasc. Compact drain bodies are ideal to install in all types of solid and suspended floor. The Skyline Soffit plank is a secret fix. Please check that the input data has been correctly interpreted. Alumasc Water Management Solutions Rainfall (l/s/m2) Step 2 - Enter Roof Details. BBA approved polyester powder coating process. Drainage Calculator MicroDrainage Support Technical & Project Support. The new NDS app is the perfect tool for determining runoff and system requirements on the go. Copper & Zinc Gutters. 449. Roof construction Roof outlets are not multi-purpose, versions are designed. firstName }]} {[{ user. Aluminium Fascia, Soffit and Coping. 78 inc VAT Was: £8. UltraSlot is used in external concrete areas which are subject to constant traffic, such as airports & ports. Our objective is to give designers the ultimate freedom to push their creativity to the limit. Retrofit. Use our rainwater drainage calculator to calculate your property's flow requirements or ‘flow capacity’ of the gutters you're considering purchasing. Single Branches. Otherwise, check out these important facts you probably never knew about alumascdrainage. 9 Mar 2022. Alumasc Rubber Mat. Bovingdon High Street - Integrated Alumasc Water Management Solutions specified on new mixed-use development. . We implement a ‘Rain to Drain’ philosophy built around the belief that surface water from both roof and ground level is a valuable natural resource and should be properly. Sizes the piping needed on the acreage to be drained. Download. co. Technical Support Harmer drainage products are backed-up by comprehensive technical Gatic launches new and improved Drainage Calculator Gatic, part of Alumasc Water Management Solutions (AWMS), has launched the latest version of its industry-leading online Drainage Calculator. If you are in need of technical support on any of our products contact us at Alumasc Water Management Solutions today. GBX 162. Aluminium Wall Box. Gatic drainage solution specified for state-of-the-art Farnborough Airport development. Access our supporting technical downloads at Alumasc Water Management Solutions including BIM and CAD files. Drainage Calculator MicroDrainage Support Technical & Project Support. Logged in as {[{ user. Hydro BG USA inc. Discover the Harmer Roof Drainage and Deck Supports brochure, a comprehensive guide to the innovative and versatile range of products and solutions for flat roofing applications. Summary. Aluminium Gutter Systems. Tel: 01787 273998. 45 Harmer Technical Helpline 01536 383810 BIM available [email protected] gutter seamless aluminum roof types cost calculator antonio san rain roofing installed clean cleaning companies perfect slope systems company Top features of installing seamless alum. and other drainage systems in. Utility Programs for Drainage. Tree Grille. Alumasc Drainage Calculators comprise a series of tools to calculate the sizes of Harmer SML pipework. Alumasc waterproofing and green roof solutions are. The standard aluminium RAL colour range includes 29 colours to choose from. Copper & Zinc Gutters. Common drainage pipe sizes range from 1. For more information on our Alumasc guttering range. You can then. Selecting "Re-development" on the "Project Cost" tab of the National Stormwater Calculator influences the site complexity, and shifts the costs towards a higher complexity cost estimation. uk; of 104 /104. Calculations. Harmer backflow valves are available in single flap options for incorporation in drainage systems from 50mm to 200mm diameter and in double flap options from 110mm to 200mm diameter. Gatic sets the standard for heavy duty engineered access covers and frames. Alumasc’s Skyline and Rainwater products are available in plain mill finish or polyester powder coated. £28. Calculating drainage fall and gradients. The Skyline Coping system provides an economical and easily installed capping to upstand parapets, in conjunction with flat or pitched roofs. Deep Sump Vertical Drain Bodies - CDVT100During the sensitive refurbishment of Lambeth Palace Garden Museum, Alumasc Wade HCE drainage channels were specified to efficiently manage water drainage between the garden area and the adjacent café. Download. Speak to the experts. Alumasc offers a full technical and support service as standard for all projects: Drainage calculations. Roof Outlets. Logged in as {[{ user. User of MicroDrainage benefit from a user-friendly interface, auto-design and optimisation as well. g. Latest updates on everything Drainage Software related. The system is designed to ensure sufficient depth of concrete cover over the main body of the channel to withstand ultra heavy-duty loads. Cast Iron Rainwater. uk. Calculates the pipe size based on. . Alumasc Heritage Beaded Deep Run Gutter More Options. Soil & Waste. The package includes 4 calculators: Foul Drainage Calculator, Internal Rainwater Calculator, Roof Outlet Calculator, and Gutter Calculator. FloPlast Plastic Guttering 112mm Half Round Black Plastic Gutter More Options. Stainless Steel Drainage. It is the industry standard software for the detailed design of fully integrated storm-water and foul-water drainage systems. eatures oof Drainage Calculator linked in to local rainfall data Rainwater Drainage Drawing tool integrating Quantities About Harmer. The life expectancy of aluminium is 40 years in rural/suburban areas and up to 25 years in industrial/marine areas. Harmer. A bespoke Gatic CastSlot system was installed as part of the redevelopment of the riverside stand for Craven Cottage, home to Fulham FC. Checks the capacity of drain tile on a new drainage system. Rainclear Systems is an agent of Alumasc Building Products Ltd. Aluminium Gutter Systems. 'A Guide to Access Covers - Design &…Harmer drainage products are backed-up by comprehensive technical literature and by hands-on project support starting with technical and design advice, and extending through site installation to recommendation of appropriate maintenance regimes. We have now been able to to develop a method of manufacturing the Gatic Kerbdrain unit as a single, solid and monolithic system. Floor Gullies. Alumasc Drainage Calculator. There are two options of Rainwater steel gutters available to purchase. Pete Wainer posted images on LinkedIn. The standard aluminium RAL colour range includes 29 colours to choose from. , Rectangular. Bituminous Membranes, Flat Roof Systems, Structural Waterproofing and Green Roofs, complemented by a range of Flat Roof Accessories such as edge protection. If you are in need of technical support on any of our products contact us at Alumasc Water Management Solutions today. For use in airports, docks and ports, industrial and commercial applications. #alumasc #raintodrain Pete Wainer Chris Goring. The majority of the group’s business is in the area of. For example within; industrial, commercial and infrastructure. Project Images. Details. Contact: Sales. 5″ or 2″. +44 (0) 1744 648400. Find out more. Our online tools have been designed with simplicity in mind removing the need for any prior specialist industry knowledge. Selective bolt-on acquisitions that provide synergies, new products and. co. We have an extensive portfolio of successful past solutions in situations where a bespoke rainwater drainage design was the only answer. Drainage Design Calculator Architects and building service engineers can now design andOur market leading drainage calculator has had a revamp. Hopper Heads. In principle, syphonic drainage is a very simple process. It has also become one of the more renowned and iconic spaces to have benefitted from Alumasc WMS expertise, receiving the full ‘rain to drain’ treatment. Overview. Angle (degrees) Area (sq m) Step 3 - Enter Gutter Details. For the gutter calculator click here. Alumasc Water Management Solutions. To book a seminar or find out. Find out more at Alumasc Water Management Solutions. Skyline Copings are equally suited to retrofit and new build projects. Download. Now he is ready to take on a new role in the. Drainage Calculator MicroDrainage Support Technical & Project Support NBS Specifications Request a sample Frequently Asked Questions. A full range of NBS specifications and roof drainage calculators are available via Alumasc’s online NBS Specification Builder at For project. For household sinks, the drain pipe diameter is often either 1. Rainwater. Find out more. The Harmer SML system is fully compatible with Alumasc’s ranges of Aluminium, Cast Iron Outlets, Aluminium Floor Drains, and Modulock Linear Channel Drains – enabling flexible design solutions to be found for all soil, waste and rainwater drainage configurations. Speak to the experts in Aluminium, Cast Iron & Steel Rainwater. . co. Skyline. Made from lightweight & durable aluminium. To learn more about CPD seminars, Micro drainage or to use the Alumasc Drainage. Contact us for further support. The standard range of colours are produced with a 30% gloss unless otherwise stated. package includes 4 calculators: Foul Drainage Calculator, Internal Rainwater Calculator. 5) Uniclass CI/SfB G581 DRAINAGE SYSTEMS. Here at Alumasc Water Management Solutions (AWMS), we have taken measures to make a positive impact and to become more conscious of the environment within the industry. The Company operates through three segments: Water Management, Building Envelope and Housebui lding Products. lastName }]} – Logout Practice:Gain access to all our technical downloads from CAD drawings, BIM files and the Alumasc Drainage Calculator when you login to Alumasc Water Management Solutions. Available sealed or unsealed, circular or square and will a solid top or recessed top for. View options. 28 Jan 2022. How to Use the Calculator. . Gatic Slotdrain from Alumasc Water Management Solutions (AWMS), has been successfully installed at Farnborough Airport’s new innovative hangar facility. Aluminium Downpipes and Hoppers. Rainwater. The current edition covers details of foul water drainage, both above and below ground, pipe sizes, protection of pipes, manholes and inspection chambers. Gatic. It is the industry standard software for the detailed design of fully integrated storm-water and foul-water drainage systems. Steel Rainwater. , 12 feet. Alumasc Drainage Calculators comprise a series of tools to calculate the sizes of Harmer SML pipework. Regional Sales Director - North at Alumasc Water Management Solutions 1yCastSlot features an electro painted ductile iron throat section, which is securely fixed to the galvanised steel channel body to provide an exceptionally robust yet discreet drainage system. The channel top edge has an outward fold for protection over the edge of the concrete encasement. Step One: Calculate Effective Maximum Roof Area B + C _ 2 x length of roof = area in m² Installation Tips For gutter fixings onto wooden fascias use 25mm x No. A 1. Development of further synergies in our “Rain to Drain” strategy. Get widget Add keyword × Add new keyword for tracking Close Track keyword What is MetricsCat. Castle Composites Granite Coping Stone - End Piece From. The design assumes a 50 year building life with a 1. package includes 4 calculators : Foul Drainage Calculator , Internal Rainwater Calculator Tags The given email address and password are not valid Register Forgotten your password?. Alumasc is a UK-based supplier of premium building products. Key Features. Rainclear Systems is an agent of Alumasc Building Products Ltd. Rainwater Victorian Ogee Agrement Certificate 86. 5) Uniclass CI/SfB G581 DRAINAGE SYSTEMS. firstName }]} {[{ user. The FloPlast reputation for technical excellence, competitively priced and quality finished products have established the company as a leading supplier of. Alumasc 125mm x 1. Alumasc Water Management Solutions has launched a new, upgraded version of its popular online drainage calculator, which measures and specifies the. “Wade has built a strong brand on the design excellence and high quality manufacture of its products,” comments Alumasc. free. Tom Burnap’s Post Tom Burnap Specification Manager at Gatic 1yDrainage Design Calculator Architects and Building Services Engineers can now design and quantify all their Rainwater Drainage requirements using Alumasc’s dedicated design software. Drainage Calculator MicroDrainage Support Technical & Project Support. [email protected] portfolio includes a premium range of reinforced polymer modified bituminous waterproofing membranes, single-ply membranes, hot-melt structural waterproofing, cold applied liquid coatings, green roof solutions, stormwater management and a full range of complementary accessories such as building services supports and guardrail edge. Here at Roofgiant, all of our products. A project of two halves that was completed over several years, 2008’s Phase I of the Museum’s update addressed the pressing need for. co. Case study. ainage Design CalculatorHarmer Roof Drainage Roof Outlets, Roof Channel Drains and Raised Deck Supports May 2012 (52. Our recently updated drainage calculator was announced in the October Issue of the @Keyline Civils Specialist Ground Up newsletter! Read it here ️… Liked by Melanie HillThe countdown is on. Login. Double Inspection Chamber - Square. The standard aluminium RAL colour range includes 29 colours to choose from. It is tomorrow! We are ready for the Homebuilding & Renovating Show at Convention Centre, Harrogate. Download. Suited to both flush & projecting eaves applications. Other Harmer Drainage Products 86 Alumasc Premium Products - All Brands 87 For latest prices and delivery to your door visit MyTub Ltd - 0845 303 8383 - - [email protected]. The Alumasc Rainwater website provides a wealth of information on all aspects of rainwater solutions, including gutters, downpipes and associated fittings. Alumasc Rainwater is the UK's market leader of Aluminium, Cast Iron and Steel gutters and downpipes. Local Delivery Only. New business cards have arrived #Alumasc #Harmer #Wade Our dedicated platform allows you to calculate the drainage requirements for your project… Alumasc Water Management Solutions on LinkedIn: #onlinecalculator #drainagecalculator #watermanagement. Drainage Calculator, Internal Rainwater Calculator, Roof Outlet Calculator, and Gutter Calculator. 5) Uniclass CI/SfB G581 DRAINAGE SYSTEMS. Aluminium is 100% recyclable. Alumasc Group - the leading UK supplier of premium building products, systems and solutions - has been. Gutters can be exposed or concealed. David Brown posted images on LinkedInTom Burnap’s Post Tom Burnap Specification Manager at Gatic 1yAlumasc's high performance bituminous roofing membranes include options from the Derbigum and Euroroof ranges. July 2017 (52. The Skyline Soffit plank is a secret fix. Report. Calculator. The range includes Cast, Pressed and Extruded systems. Floor Drains in Changing Rooms Item: Harmer Floor. 50 incl VAT. Larger pipes like 3 inches can accommodate 30-60 GPM, and 4-inch pipes can handle 50-80 GPM. Offsets. A range of stainless steel gully assemblies for finished floors are available for use, particularly in areas associated with food production, processing or preparation where corrosion resistance or minimum maintenance is a requirement. includes a Flow rates and roof outlet calculator – enter the Spec. Rainwater Technical Brochure. Rain to Drain solutions that set the standard for urban water management | AWMS, part of Alumasc Group, is the first joined-up. Harmer. product images. Harmer. Calculator Purpose. The textile is optimised for drainage performance. Speak to the experts in Aluminium, Cast Iron & Steel Rainwater. The strap fixing method avoids penetration of the capping, whilst allowing ventilation over the top of the wall. Detailed NBS specifications, regulatory advice, Cost estimates, safety and product data sheets. With more than 50 years' experience in the industry, Wade is established as a leading manufacturer of quality drainage products. Our portfolio includes a premium range of reinforced polymer modified bituminous waterproofing membranes, single-ply membranes, hot-melt structural waterproofing, cold applied liquid coatings, green roof solutions, stormwater management and a full range of complementary accessories such as building services supports and guardrail edge. Andrew Lee - Specification Manager is presenting the AWMS RIBA Accredited (Core Curriculum) CPD seminar on Soil & Vent Drainage - Design & Specification Duration: 45 mins with 15 mins Q & A. The Alumasc Partnership 8 An Integrated Drainage Solution 9 Project Gallery 10 Harmer SML Product Range Summary 12 The Harmer SML Product Range 14 The Harmer drainage. View Product. Our extensive product portfolio ensures the provision of Rain to Drain solutions that continue to set the standard for urban water management. Nickel Bronze Wall Box. Alumasc Water Management Solutions 2,591 followers 1d Report this post Time is ticking away until our next show!! ⏰ Why visit AWMS at HB&R Harrogate? ⛪ Learn about the sustainable materials we. Improvements have also been made to the mix of. 45 4 comentarios. Manufactured in the UK. Rainwater Victorian Ogee Agrement Certificate 86. Calculate pipe diameter. product images. Designed for perimeter drainage of inverted roof and warm roof constructions, the Harmer Modulock straight channel range, manufactured from either stainless steel or galvanised mild steel, is available in 130mm, 200mm and 250mm widths, with either variable of fixed depths. Download;. Roof Outlet Calculator, and Gutter Calculator. . Speak to the experts in Drainage. Fully compatible with Alumasc’s Skyline fascia/soffit system. Slotdrain UltraSlot was specified during the re-conditioning of Dock 19 to increase capacity from 300,000 twenty-foot equivalent units (TEU) to 463,000 TEU. Tel +44 (0) 1787 475151. 59. Also included are FAQs, file downloads for NBS specification clauses, COSHH information, a CAD library, and much more. 849 for metric or 1. Soil & Waste. key points. Key Features. For more information call the Gatic team on 01787 475151 or visit Users interested in Swimm drainage software generally download: EPA SWMM 5. Skyline today offers a complete collection of unparalleled aluminium design solutions to meet every requirement — from typical to fully bespoke design solutions backed by support from our experienced, dedicated technical teams. lastName }]} – Logout Practice: Alumasc Drainage Calculators comprise a series of tools to calculate the sizes of Harmer SML pipework. Logged in as {[{ user. A Vari-Level gully comprises, as a minimum, a Vari-Level body and a Vari-Level grating; in some versions these items fit together. With a life expectancy of 50-100 + years, 100% recyclable at the end of their long, useful lives they offer an eco-friendly, low maintenance and sustainable drainage system option. If you are in need of technical support on any of our products contact us at Alumasc Water Management Solutions today. 1. Please enter the email address you used to register, then click "Reset Password" If your email address matches an account registered on our system then you will. Alumasc technical support for the Alumasc WMS includes: Design Support. Harmer Roof Drainage Roof Outlets, Roof Channel Drains and Raised Deck Supports May 2012 (52. Rainclear Systems is an agent of Alumasc Building Products Ltd. UltraSlot is used in external concrete areas which are subject to constant traffic, such as airports & ports. Simulations are available for new construction (ASHRAE 90. Stainless Steel Drainage. £72. Get in touch with our friendly customer services team today. For even greater flow capacity, 6-inch pipes can manage 120-160 GPM, and 8-inch pipes. To determine the number and size of drains, you would divide the total capacity by the capacity of a. 5° Fixed Offset. Shower Drains. This will provide a weatherproof covering to upstand parapets as the fixing method does not penetrate the Skyline Coping. Download Review Comments Questions & Answers . The updated calculator, which allows architects, specifiers and civil engineers to design and quantify all of. . . Company registration number 02992960 - VAT number GB 395 9417 96. Re-development combined with information on site suitability, topography, and soil drainage determines whether complex, typical, or simple cost curves apply. Architects, Engineers, and other users of this software must satisfy themselves in respect of the adequacy of the design Alumasc cannot be liable for any design undertaken using this software. Tags. 1-2004) office and. 3. Alumasc Rainwater, Harmer Drainage & Skyline: +44 (0)1536 383 810 Email: info@alumascwms. uk. Alumasc GRP Check Trim. Height and length typically correspond to the wall's height and length. News. Alumasc Water Management Solutions. REGISTER HEREAlumasc Rainwater, the leading manufacturer of all metal systems, introduces Infinity – the new name for its high-performance steel gutters and downpipes. Syphonic Explained. Back SubmitAlumasc. EPA SWMM. Drainage Design Calculator Architects and building service engineers can now design andMicroDrainage is a well-recognised tool for civil engineers working on surface water and external drainage calculations. Can be factory finished to replicate cast iron or with a BBA certificated powder coating in a range of colours. The range includes Cast, Pressed and Extruded systems. exe. uk Call: 01234 359438 or Click here for further contact details. 83m Apex Heritage Cast Iron Downpipe (No Ears) £59. Kerbdrain. A versão mais recente do Alumasc Drainage Calculators pode ser baixada para computadores executando Windows XP/7/8/10/11 de 32-bit. Skyline. Alumasc Water Management Solutions. Water Flow Calculator; Customer Information. Beaded Deep Run. Grease / Sediment. 4 calculators: Foul Drainage Calculator, Internal. 2 Maintaining a Flow of Information The Harmer drainage website provides a wealth of information on all aspects of Harmer Drainagoof Drainage Calculator linked in to local rainfall data Rainwater Drainage Drawing tool integrating Quantities. To learn more about CPD seminars, Micro drainage or to use the Alumasc Drainage Calculator, click here. Check out our updated Drainage Calculator NOW! 👀🆕 We're delighted to. Water Flow Reducing Layer.