Download the Percolation Test Results Sheet HERE. A relatively large amount of space is required for a soakaway to be considered. NB: If the water table is hit during the excavation, a soakaway will not be suitable. The testing process is simple- dig a pit to specific dimensions, fill the pit with water, and time how long the water takes to soak into the soil. Carry out the test at least 3 times, with at least 2 trial holes. Thus preventing it backing up and causing flooding. During the timed testing only the volume between the top 25% and the bottom 25% are taken into consideration. Percolation test result (Vp) X = X 0.25 = M 2 * Potential number of occupants – this number must represent the number of people who could occupy the dwelling. A percolation test should not be carried out during abnormal weather conditions and if done in Summer, then the times should be increased by 30% to 50%, depending on the recent weather. Make a note of the dimensions of your trial pits on the provided results sheet. From our experience, it is also not uncommon for builders to build the soakaway too small in order to save some time. sufficiently far from any other drainage fields. The water is then released slowly through a small calibrated orifice to control the flow. Make a note of the time taken on the sheet provided. Simple and to the sometimes refered to as ‘storm attenuation’ reduce the rate of water entering the drainage system. Plus areas that won’t ‘soak away’ due to heavy clay, or high water table. How to Run a Percolation Test Part 4 Part 4 in our series on How to Run a Percolation Test. A Soakaway is an area underground where rainwater can infiltrate into the soil. Dig the test hole vertically to the proper depth. In many cases, sites with a high water table or a heavy clay content will also not be suitable. Dig the pit to full depth, squaring off all edges. Excavate a hole 300mm square and 300mm below the proposed outlet from the septic tank or sewage treatment plant. at least 10m from a watercourse or permeable drain. at least 50 m from the point of abstraction of any groundwater supply. drop. 1.33 to 1.38 Part H2 of the Building Regulations 2000: Drainage and waste disposal, 1.27 Part H2 of the Building Regulations 2000: Drainage and waste disposal. Not in any Zone 1 groundwater protection zone. drop. Each pit should have a minimum footprint of 0.3m x 1m. Percolation testing results sheet’ and pen. This is to make sure that the land (soil) is suitable for a soakaway, and to make sure that the soakaway is designed properly. The results from the test allow a drainage engineer to decide if a soakaway is suitable and if so, recommend the correct size. A handy step by step site guide can be downloaded, Download the Percolation Test Results Sheet. The percolation test method is described in 1.33 to 1.38 Part H2 of the Building Regulations 2000: Drainage and waste disposal (Go to page 33). Please contact us for further details. Remove all loose debris. Send the results sheet to email@example.com. Secondly, it forces your builders to build the soakaway to the correct size (see above.) If this is not known, a depth of around 1.5m is typically sufficient. NB large volumes are required for percolation testing. At worst you could have dirty surface water flooding your home and causing damage. Contact our team for advice on other options. A method of digging holes of considerable size. The following guide is broadly written to the standards of BRE365 (UK soakaway design digest.). Allow to seep away overnight. NB: Markings must be clear during the testing process. Where Vp is outside these limits, effective treatment is unlikely to occur. The average figure from the tests is taken. Clearly mark the pit 75% and 25% by scoring the pit wall or using line paint. Small sites that cannot meet the rules regarding the proximity of a soakaway to a development, road or boundary. Stormwater is passed through a self cleaning filter and held within a tank. A source of water. A minimum of two trial pits are required within location of the proposed area for the soakaway. Check first with your local planning authority. Lowest rate (min per inch) The results of the percolation tests were: Trial Hole 1 Trial Hole 2 To demonstrate to your local authority you have carried out the test correctly, we strongly advise you take time-stamped photos of each stage below. Each test can use in excess of 200L. If provided with test results, our team will provide the necessary calculations for a soakaway without obligation. Rain Activ provides simple, cost effective, SuDS for smaller sites at a fraction of the cost of traditional systems. Remember, the purpose of a soakaway is not only to dispose of the effluent into ground, but also to further treat it, using aerobic soil bacteria, before it mixes with groundwater. Before starting each test, ensure the pit is completely emptied. A handy step by step site guide can be downloaded HERE. Rainwater Harvesting Ltd accept no liability for loss or damage whilst using this guidance. Due to instances of urban surface water flooding, the planning authority may stipulate the use of SuDS (Sustainable urban Drainage Systems.). Please check with your Local Authority. A percolation test is ALWAYS required for septic tanks. Rainwater Harvesting and Rain Gardens, are considered good methods for domestic developments but can be difficult to supply the required calculations. Where the calculated result indicates the need for a drainage trench longer than 200 metres, serious consideration should be given to the use of a more economic alternative sewage treatment system. Stop timing when the water level reaches the 25% mark. Measure the depth of the pit then divide by 4. What is a soakaway? Soil Test How to run a soil test on your own! The percolation test calculations for a soakaway are as follows Area (A) = V X P X 0.20 for sewage treatment units and Area (A) = V X P X 0.25 for septic tanks V = the time is seconds for the water in the test hole to drop by Filling should be as fast as possible without causing damage to the walls. What systems are available? A percolation Test fails if the results are under 15 or over 100 seconds/mm. 1.27 Part H2 of the Building Regulations 2000: Drainage and waste disposal (go to page 32) states that. What to do if your site cannot accept a soakaway. Firstly the soakaway can be smaller in size (as there is lots of space in the crates to receive the water in comparison to broken rubble.) Required length of irrigation drain, in metres. Unlike any other SuDS systems, Rain Activ can be easily combined with rainwater harvesting and provide a payback. For example, the results of the test may indicate that a site is only suitable for a single family home, not a duplex or larger development, which can impact how the property will be developed. The average value of Vp must be between 15 and 100 and the preliminary site assessment report and hole tests favourable to use drainage field disposal. Download Here. Why use ‘crate’ soakaways rather than a traditional rubble filled pit? A simplified method is set out below, but for the full method, please click on the link above. Crate soakaways are also less likely to silt up and fail, reducing costs down the line. Fill the test hole with water to a depth of at least 300mm. The answer gives average time in seconds (Vp) required for the water to drop 1mm. Who can’t use a soakaway? Why is proper percolation testing important? Begin timing when the water level reaches the 75% mark. Clearly mark the pit 75% and 25% by scoring the pit wall or using line paint. A percolation Test fails if the results are under 15 or over 100 seconds/mm. Percolation test form Location (address): File #: Date: Tested by: Weather: Test number Depth of base of hole from surface (cm) Timings, mins per inch for water to drop from 6″ to 5″ from base of hole. Contact one of our sales team who will be able to provide some alternative options. It is a test that determines the rate in which soil absorbs a known volume of water. Percolation Test Data Sheet PRODUCT INFORMATION Issue 1 – March 2017 This Percolation Test follows the procedures laid out by the BRE Digest 365 Step 1 - … If the pit has not emptied completely after 24 hours, a soakaway is not suitable. At least 1.2 metres above the highest winter water table level. Non-Electric FilterPod Wastewater Treatment System. Ensure you make a note of the time taken on the sheet provided. A percolation test measures how quickly water drains away from the soil. A drainage field or mound serving a wastewater treatment plant or septic tank should be located: © Water Technology Engineering Ltd.. 2020, A soil percolation test is required to be carried out on the land where the, The percolation test method is described in. A sewage treatment plant will produce a better quality of effluent which, with permission, is fed into a water course or open culvert. However, where there is an alternative form of tertiary treatment to treat the effluent, it may still be discharged into a soakaway. This will cause it to fail. What are SuDS? To conduct a percolation test, a series of holes are dug, and the sides of the holes are roughened before the holes are presoaked.
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