So obviously, how large your soakaway will need to be, or if you can even install one at all, will depend on which type of soil you’re installing into, and a percolation test is the way to determine this. (2) Results. However, the percolation test is only the last of the three mandatory tests which assess your site: ... Our installer will perform further calculations to find out the length of pipes required. Septic Tank Regulations 2020 – Are You Compliant With The New Legislation? While every jurisdiction will have its own laws regarding the exact calculations for the length of line, depth of pit, etc., the testing procedures are the same.”. Make sure you don’t carry these tests out in abnormal weather conditions such as severe frost, heavy rain or drought. A percolation test is also known as a soil porosity test. If provided with test results, our team will provide the necessary calculations for a soakaway without obligation. This site uses Akismet to reduce spam. Here at Direct Drainage we have a comprehensive in-house knowledge of waste water treatment processes, pumping stations, separators and rain water harvesting systems. Typically 1x1m wide and 2m deep. P = the max. In this guide we’ll go through the basics of performing a percolation test. With operations in 12 locations across Europe, we supply a comprehensive range of products to over 50 countries worldwide. (ii) The drop that occurs in the final period in percolation test holes, expressed as minutes per inch, shall be used to calculate the arithmetic average percolation rate. Calculate Percolation rate – The percolation rate is the average time in minutes required for water to fall 1 inch. A trial hole should be dug to determine the position of the standing ground water table. The provisions of this § 73.15 amended under sections 7.2 and 9 of the Pennsylvania Sewage Facilities Act (35 P. S. § § 750.7b and 750.9); The Clean Streams Act (35 P. S. § § 691.1691.1001); and section 1920-A of The Administrative Code of 1929 (71 P. S. § 510-20). The installer will then likely perform further calculations to find out the length of pipes required. Read EasyMerchant’s blog. A percolation test measures how quickly water drains away from the soil. In this guide we’ll outline how to perform a percolation test for foul water. The percolation test is the LAST of the 3 mandatory tests to determine if a new or replacement soakaway can be installed. With over 30 years’ experience in the waste water treatment operation you can trust our comprehensive knowledge to supply you with the correct part at the right price. Foul water soakaways deal with small volumes over a long period, whereas the rainwater soakaway may have to handle large volumes in a short time and the percolation test explained here is ONLY for foul water soakaways. The Pennsylvania Code website reflects the Pennsylvania Code A percolation test is carried out to determine how suitable the ground conditions are for installation of a soakaway (drainage field), for properties or sites that are unable to connect to a watercourse. Dig the test holes, 300mm square to a depth at least 300mm below the required invert level of the infiltration pipe. Further calculations are required to give the length of pipes required depending on the width of the trench, e.g. This section cited in 25 Pa. Code § 71.63 (relating to retaining tanks); and 25 Pa. Code § 73.54 (relating to subsurface sand filters). The provisions of this § 73.15 adopted January 21, 1983, effective January 22, 1983, 13 Pa.B. We operate directly with the major manufacturers such as Kingspan Klargester, Premier Tech Aqua, Grundfos, WPL, Charles Austen, Bauer, Clearwater and more. ), Be warned, soakaway crates and tunnels are NOT allowed for septic tank and sewage treatment plant soakaways. 508; amended November 1, 1996, effective November 2, 1996, 26 Pa.B. The Pennsylvania Code website reflects the Pennsylvania Code changes effective through 50 Pa.B. Dig holes – Using a 4- to 8-inch hand auger, post hole digger, or shovel, dig at least three (preferably four) holes spaced evenly where the drain field is planned. The minimum value ensures that untreated effluent can’t percolate too rapidly into the ground water. for a 600mm wide trench, the AREA would be divided by 0.6. Fill the hole with water to a depth of 300mm and allow it to drain away overnight. Area (A) = V X P X 0.20 for sewage treatment units. Preparing the test hole. A percolation test should then be carried out to assess the further suitability of proposed area. Perc test holes should be made at points and elevations selected as typical in the area of the proposed absorption field. 4882 (August 29, 2020). In its broadest terms, percolation tests are simply a way of observing how quickly a known volume of water dissipates into the subsoil of a drilled hole of known surface area. A percolation test (colloquially called a perc test) is a test to determine the water absorption rate of soil (that is, its capacity for percolation) in preparation for the building of a septic drain field (leach field) or infiltration basin. We had a perc test completed prior to purchasing, and used this site to confirm our results are ok. 3 bed house with max 6 occupants P x Vp x 0.25 (septic tank with no secondary treatment) = 6 x 21.23 x 0.25 = 32 m2. Please contact Building Control if your Vp falls outside this 12-100 band. After the final presoaking period, water in the hole shall again be adjusted to approximately 6 inches over the gravel and readjusted when necessary after each reading. If the test is carried out in summer, the likely winter groundwater levels should be considered. There are also several other factors to be considered and by no means is a percolation test result the only concern. Six or more tests shall be made in separate test holes spaced uniformly over the proposed absorption area site. If the soil is suitable, a percolation test will then decide how large your soakaway system will need to be. Where deep excavations are necessary a modified test procedure may be adopted using a 300mm earth auger. Depending on the results you will then be able to calculate the size of the soakaway or drainage field required. V = the time is seconds for the water in the test hole to drop by 1mm. This could be up to a metre below the ground, so you may need to dig a hole large enough to stand in before digging your percolation test hole. The drop in the water level during the last 30 minutes of the final presoaking period shall be applied to the following standard to determine the time interval between readings for each percolation hole: (i) If water remains in the hole, the interval for readings during the percolation test shall be 30 minutes. The percolation test should be carried out at least three times with at least three trial holes. 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 1mm. Ecover Products and Sewage Treatment Plants, New Septic Tank Rules - General Binding Rules 2020, Septic Tank Registration and Inspection- IRELAND, soakaway crates and tunnels are NOT allowed for septic tank and sewage treatment plant soakaways, Home - Wastewater Treatment and Septic Tank Systems. PERCOLATION TEST PROCEDURE & FORM Use the following instructions to conduct a percolation test. Please follow steps 1-5 and fill out the Perc Test Table below. The result (A) will be the area in m2 required for the soakaway system. P = The maximum number of persons that the tank or plant is designed to serve Area (A) = V X P X 0.20 for sewage treatment units It is crucial that a percolation test gets carried out if you are thinking of installing a new soakaway system or replacing an existing one to avoid any future soakaway problems. The percolation test measures the amount of time it takes for water in a test hole to drop 1 inch. As experts in Sheet Moulding Compound (SMC), Tricel design, develop and supply wastewater treatment plants constructed from this versatile material. Dig the hole to 300mm wide by 300mm deep below the required invert level of the drainage pipe. Where Vp is outside these limits effective treatment is unlikely to take place in a drainage field. Many greywater codes use a soil type chart to predict drainage rates instead of percolation rate data.
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