![]() ![]() We now need to add 50% for climate change and a 100-year storm giving us 3 cubic metres. (to keep this easily understandable to the readers I am going to calculate on a 10m x 10m roof only) we work out our square metres 100 in this case we divide this by 10 to give us the number of 0.2 cubic metre requirements in this case 10 giving us a total basic requirement of 2 cubic metres for our soakaway. This equal 0.2 cubic litres per 10 square metres. ![]() So our calculation for standard good draining soil is, we require 200 litres of capacity for each 10 square metres of area of capture progressing to our soakaway. There are 2 more important things we need to take into account when we calculate our soakaway : climate change allowance and 100-year storm scenario.Īt BP Plastics we work on a general rule of 15% climate allowance and 35% 100-year storm allowance, giving a resilience level overall of 50%. What is 100-year storm and climate change allowance?.Ok so now we have the main information we need to calculate the size of soakaway we need (again I must remind you this is only general and may vary). If the water has not drained by this time then the location we have tested is not suitable for a soakaway, at this point we can explore trying a test at a different location to see if results improve or to accept we are going to look at moving to attenuation solution which is a slightly more complicated option to soakaway and often more expensive. However, if the water has not totally receded we need to move to part 2 of the test and come back the next morning and check our test hole, if the water has all gone we can then move on to calculate the size of our soakaway as we have medium draining soil. Our soil is good draining and we can proceed to calculate the required size of our soakaway. If the water has disappeared we have a result. 6 hours later we go back and check the hole. (To simplify we are trying to find if the soil is good, medium or poor draining as this will help us calculate the size of our soakaway).Īt BP Plastics we have an absolute minimum test requirement of digging a hole approximately 100mm (post hole size using an auger maybe) to a depth of 1.2 metres deep, we should start the next part of the test early in the day, we fill this test hole with water to the top. Next we need to perform a percolation test at this location (scary terms and requirements may vary in different areas and with different engineers or professionals, the purpose of a percolation test is simply to discover how well the soil drains at our proposed location for our soakaway. ** Orders in excess of 4no crates are subject to our non-standard delivery terms (2-5 days). We will not be beaten on price or service! Please call us if you would like more information.Įxplore our extensive selection of plastic drainage pipes. Please note, the Soakaway Crates we offer are ready built and not flat pack crates supplied by other manufacturers.īuild Plumb Plastics buy in bulk and are able to offer the cheapest price for Soakaway Crates. For a guide to installation and technical specification, please call or email our technical support team to request the appropriate brochure or download the Polypipe Polystorm technical installation guide and the Brett Martin StormCrate Installation Guide here. The Soakaway Boxes are manufactured to the same exacting standards as other high-quality brands such as the Wavin Aquacell crates.Įach crate is supplied with the correct number clips and sheer connectors to aid installation. We offer a range of silt traps, flow control units and adaptors are also available to complete the system. Soakaway Crates are quick & simple to install and a variety of size-configurations can be easily formed. These modular water storage cells have a high void ratio and are used for either attenuation or infiltration of stormwater in residential, commercial, industrial and agricultural applications. Our range of Soakaway Crates include the Polypipe Polystorm, Polypipe Polystorm Lite, Aqua Storm and the Brett Martin StormCrate. Brett Martin Cascade Cast Iron Effect Guttering ![]()
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