Where Vp is outside these limits, effective treatment is unlikely to occur. By providing an approximate figure for the impermeable area of your development (roofs and driveways) and your geographical location, our team can provide a no obligation quotation for a soakaway. The results from the test allow a drainage engineer to decide if a soakaway is suitable and if so, recommend the correct size. Who can’t use a soakaway? Filling should be as fast as possible without causing damage to the walls. This will cause it to fail. Our company always advise the use of modular ‘crate’ soakaways. 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. Begin timing when the water level reaches the 75% mark. 1.27 Part H2 of the Building Regulations 2000: Drainage and waste disposal  (go to page 32) states that. Some authorities may request more tests or more pits. 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 - … The minimum value ensures untreated effluent cannot percolate too rapidly into groundwater before tertiary soil treatment has taken place. drop. You may be required to contact a contractor to carry out the percolation test. at least 10m from a watercourse or permeable drain. Send the results sheet to info@suds-solutions.co.uk. Each pit should have a minimum footprint of 0.3m x 1m. Excavate a hole 300mm square and 300mm below the proposed outlet from the septic tank or sewage treatment plant. Contact one of our sales team who will be able to provide some alternative options. 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. Do bleaches and detergents affect the septic tank? The soakaway must be a minimum of; NB: Due to size constraints, developments in urban areas are sometimes not large enough to use a soakaway. Next day, refill the test section with water to a depth at least 300mm. Stop timing when the water level reaches the 25% mark. A method of digging holes of considerable size. Contact our team for advice on other options. For example a 1.6m pit = 0.4m. 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. A handy step by step site guide can be downloaded, Download the Percolation Test Results Sheet. Clearly mark the pit 75% and 25% by scoring the pit wall or using line paint. Stormwater is passed through a self cleaning filter and held within a tank. Download the Percolation Test Results Sheet HERE. NB: If the water table is hit during the excavation, a soakaway will not be suitable. A percolation Test fails if the results are under 15 or over 100 seconds/mm. Each test can use in excess of 200L. However, where there is an alternative form of tertiary treatment to treat the effluent, it may still be discharged into a soakaway. 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). Carry out the test at least 3 times, with at least 2 trial holes. At worst you could have dirty surface water flooding your home and causing damage. drop. Dig the pit to full depth, squaring off all edges. Allow to seep away overnight. In preparation for timed testing, the test pits should be completely filled then left to drain for 24 hours. A soil percolation test is required to be carried out on the land where the septic tank system or sewage treatment plant soakaway is intended to be built. When building you must insist a percolation test is completed. It is a test that determines the rate in which soil absorbs a known volume of water. In many cases, sites with a high water table or a heavy clay content will also not be suitable. The results of the percolation tests were: Trial Hole 1 Trial Hole 2 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. During the timed testing only the volume between the top 25% and the bottom 25% are taken into consideration. Lowest rate (min per inch) Thus preventing it backing up and causing flooding. From our experience, it is also not uncommon for builders to build the soakaway too small in order to save some time. NB: Markings must be clear during the testing process. A Soakaway is an area underground where rainwater can infiltrate into the soil. A sewage treatment plant will produce a better quality of effluent which, with permission, is fed into a water course or open culvert. Observe the time, in seconds, for the water to seep away from 75% full to 25% full. A minimum of two trial pits are required within location of the proposed area for the soakaway. How to Run a Percolation Test Part 4 Part 4 in our series on How to Run a Percolation Test. SuDS systems? All planning authority calculations are provided. Measure the depth of the pit then divide by 4. The water is then released slowly through a small calibrated orifice to control the flow. At least 1.2 metres above the highest winter water table level. A percolation test measures how quickly water drains away from the soil. IMPORTANT  Some Councils insist that Percolation Tests are carried out by 'qualified persons' and do not accept your own test results.


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