The Study On Night Legal Water Consumption Prediction And DMA Leakage Analysis Method

None revenue water(NRW) is the difference between the supplied and the selled water in water supply enterprise, which mainly includes the apparent leakage and the real leakage. To control and lower the NRW is of great significance for saving water resources, reducing the economy loss and ensuring the security of water supply. For the reasons of pipeline laying under ground, the wide water supply area, and concealment of the apparent leakage and the real leakage is more real, it’s of great difficulty to take full-scale inspection and leak detection, as well as the very low efficiency.DMA technology divide pipe network into several regions by installing the remote transmission flow meter and pressure meter, through real-time monitoring and analysis of remote transmission flow data, pressure, it can be determined which is the major cause of regional water loss, the DMA technology is one way to efficiently control and reduce none revenue water. However, there is still a lack of key parameters, the problem of insufficient of analysis methods when the technology used in Chinese water supply network, it will bring certain interference with the result of analysis.This paper, taking Guangzhou remote transmission household table intelligent village and DMA villages as the foundation, makes some study and optimization on the night legal water consumption and analysis methods of DMA technique.Night legal water consumption analysis and quantify. First the paper analysis the whole area household night legal water consumption of different date and distribution among users, the area consumption of different date fluctuates around the average within a certain scope, it’s found that the groups daily water consumption and night legal water consumption show a simultaneously increase trend in statistics.Then optimize the quantify method of night legal water consumption and fit "daily household average consumption- daily household average night legal water consumption", "whole night legal consumption range-average", respectively to forecast average night legal water consumption and fluctuation range in different village, superior to the traditional no-identification single parameter method. In addition, the scope changes of different moving average night legal water consumption are studied and quantified.The analysis of none revenue water balance and the judgement of apparent leakage.This paper introduce the main process on none revenue water balance analysis, identify the real leakage quantitative error sources, and deduce the quantitative formula of real leakage error. On the basis of the water meter measuring features and consuming mode, this paper also establish quantitative method for reasonable water metering error range, which can be treated as the determination of apparent leakage parameters, combined with none revenue water balance analysis result to judge and guide the apparent leakage control.The judgement of DMA real leakage.In order to improve the judgement efficiency and reduce interference.This paper study the influence factors of real leakage judgement during the DMA running period and establish the minimum night flow moving average differential method to determine the real leakage.Through model transformation and data samples analysis, it is worked out to determine the optimal moving average number of days, and the real leakage judgement parameter threshold of different district.