Abstract. Water distribution is generally installed through underground pipes. Monitoring the underground water pipelines is more difficult than monitoring the water pipelines located on the ground in open space. This situation will cause a permanent loss if there is a disturbance in the pipeline such as leakage. Leaks in pipes can be caused by several factors, such as the pipe's age, improper installation, and natural disasters. Therefore, a solution is required to detect and to determine the location of the damage when there is a leak. The detection of the leak location will use fluid mechanics and kinematics physics based on harness water flow rate data obtained using flow liquid meter sensor and Arduino UNO as a microcontroller. The results show that the proposed method is able to work stably to determine the location of the leak which has a maximum distance of 2 metres, and it's able to determine the leak location as close as possible with flow rate about 10 litters per minute. IntroductionWater is an essential element for every organism, the needs for providing a good water distribution system is a must. Sometimes, the condition in certain location does not allow us to create a good water distribution system on the ground and the development of constructions causes the current water distribution system to residentials, offices, and industry premises through pipes under the ground.Flow liquid meter sensor is one of the sensors that is used for this monitoring process. This sensor uses Hall Effect sensor inside it to measure the water flow rate and is placed on a pipe that has a diameter equal to the diameter of the sensor. The sensor will retrieve water flow data by analysing rotation count of the wheel. A microcontroller is required to process this data in order to know how the rate of water flow through [1]. Then the data will be sent by the microcontroller to the end node via internet access.Clean water is a critical requirement in human life. Commonly, water distribution is done through underground pipes, where the water pipeline will become more difficult to control than the one in the open space. This situation will cause a permanent loss if there is a disturbance in the pipeline such as leakage. Leaks in pipes may be caused by several factors, such as the age of the pipeline, improper installation, and the condition of the environment (natural disaster, etc.). Therefore, an efficient solution is required to detect and to locate the damage in underground pipeline system.

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