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One of our services is to find answers for our clients on a range of technical issues. Each week we select one of the many questions we receive and provide the answer directly to the person who asked the question as well as publishing the questions and answer on the website. If you would like to ask a question fill in the simple registration form; you will not only receive regular technical updates but may also have your questions answered directly. You will also have access to a range of technical reports. This weeks question came from an irrigator at Mildura. Q: “I have often seen the expression cv associated with drip products, what does it mean?” A: cv is the coefficient of variation. It is also known as the manufacturing coefficient of variation and is a measurement of the variation in the discharge rate of drippers. For example the nominal discharge rate of a dripper might be 2 L per hour at a given pressure however because of small variations in the manufacturing process the actual discharge from a batch of drippers may vary from say 1.8 L/Hr to 2.2 L/Hr. If drippers are tested according to the ISO standard then they can be classified as Class A, Class B or not classified. Class A drippers have cvs of less than 5%, Class B drippers have cvs between 5 and 10% and unclassified drippers have a cv of greater than 10%. The table below shows the flow ranges for the different classes of dripper. It is important for the irrigator to know exactly how much water they are applying so that the irrigation schedule is correct. Actual flow rate range for different classes of dripper
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