How to Join Different Types of Plastic Pipe. Where Vp is outside these limits effective disposal is unlikely to take place in a soakaway drainage field. Please follow steps 1-5 and fill out the Perc Test Table below. Furthermore, soakaway systems do not get installed under driveways, parking areas, buildings or near trees, dwellings, boundaries, rivers and streams. V = The amount of time in seconds for the water in the test hole to drop by 1mm. Professional percolation tests, required for septic leach fields, are expensive, and unnecessary for a small greywater system. Your email address will not be published. Please note that the test will differ depending on whether the soakaway will be for foul water or surface water drainage. Fill the perc. (3) Type of hole. 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. However, an acceptable approximation can be made by accounting for the soil texture and by making measurements under non-saturated conditions. Blue clay is quite common in the UK. Six or more tests shall be made in separate test holes spaced uniformly over the proposed absorption area site. This site uses Akismet to reduce spam. Immediately before the percolation test, water shall be placed in the hole to a minimum depth of 6 inches over the gravel and readjusted every 30 minutes for 1 hour. 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. If provided with test results, our team will provide the necessary calculations for a soakaway without obligation. There are two very different types of soakaway – foul water soakaways and surface water soakaways. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Soakaway planned in adjacent field. The installer will then likely perform further calculations to find out the length of pipes required. Fill the 300mm square section of the hole to a depth of at least 300mm with water and allow it to seep away overnight. Thirdly, the percolation test, as outlined, is required. 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. CALCULATION OF PERCOLATION RATE . You’ll then need to repeat this exercise several more times with a total of three being the minimum. The Pennsylvania Code website reflects the Pennsylvania Code changes effective through 50 Pa.B. 2. The tests are part of the British Standards BS 6297:2007. However, the percolation test is only the last of the three mandatory tests which assess your site: It’s important to note that it is not recommended to carry out the percolation test during abnormal weather conditions such as heavy rain or drought as this will skew any results with unusual groundwater levels. The Pennsylvania Code website reflects the Pennsylvania Code which is a necessity if you’re going to install a septic tank or soakaway crates system. Percolation test results cannot be translated into field saturated hydraulic conductivity A parameter that describes the capability of a medium to transmit water. So basically, there are different soil types, and obviously a sandy fine soil is going to drain water away much faster than a dense thick blue clay will. V = the time is seconds for the water in the test hole to drop by 1mm. Which depends on the width of the trench. ), Be warned, soakaway crates and tunnels are NOT allowed for septic tank and sewage treatment plant soakaways. How to do a Percolation Test for Soakaways / Septic Tanks. With the previous result (Vp), you can now calculate how much surface area you need to house your soakaway system: Vp = The speed at which the water in the test holes percolates through the soil. Discharge to drainage ditches - who owns the ditch? Bore the test hole vertically to the appropriate depth taking care to remove all loose debris. The answer gives the average time in seconds (Vp) required for the water to drop 1mm. A trial hole should be dug to determine the position of the standing ground water table. Repeat this exercise at least two more times with at least two more trial holes. A percolation test hole 300mm x 300mm x 300mm deep should be excavated below the proposed invert level of the effluent distribution pipe. Where deep excavations are necessary a modified test procedure may be adopted using a 300mm earth auger. Percolation tests should not be carried out during abnormal weather conditions such as heavy rain, severe frost or drought. Percolation test - results and drainage field calculation … (2)  Results. ', Area (A) = V X P X 0.20  for sewage treatment units and. Many thanks. The percolation test calculations for soakaway installation are as follows: Area (A) = V x P x 0.20 for sewage treatment systems, V = the time in seconds for the water in the test hole to drop by 1mm, P = the maximum number of persons that the treatment system/tank is designed to serve, The calculation gives the area in square metres required for the soakaway trenches. The resulting calculation will give you the area in m2 required for the soakaway system. Make sure you don’t carry these tests out in abnormal weather conditions such as severe frost, heavy rain or drought. Thanks so much for this guide, made my life a lot easier when it came to installing my soakaway system! (iv)   When a percolation test hole is dry at the end of a 10 minute testing interval, that hole may not be used in the calculation of the arithmetic average percolation rate. You can carry the test out yourself, but if you are uncertain it is always worth asking your installer to conduct this on your behalf: Your ground is only suitable a soakaway (drainage field) if the percolation test results show average values of Vp between 15 and 100. Beware of the 'Cowboy Traders! Avoid doing the perc test when raining. The percolation test measures the amount of time it takes for water in a test hole to drop 1 inch. 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. The results of a percolation test are required to properly design a septic system. The percolation test is the LAST of the 3 mandatory tests to determine if a new or replacement soakaway can be installed.

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