Construction and application of PDD model considering leakage and water-users in water supply network

The whole water is assigned to each node according to the pipes' length in micro-dynamic hydraulic model of water supply network. Traditional hydraulic model of water supply network ignored the category of nodes flow and distributed the total leakage to the network equally. To solve this problem, nodes flow of traditional hydraulic model were divided into water users' consumption and water leakage, and the improved consistent leakage model distributed the leakage flow based on length and built the relationship between the leakage and pressure, then the pressure-driven nodes hydraulic mode (PDD) was finally established. The model was checked based on actual measuring point data, and reached the model checking standard. Based on the actual network data in Y city, the average leakage rate is calculated as well as the fitness function between water supply and actual water supply, then the leakage coefficient of the network model is achieved, and finally the leakage simulation based on pressure-driven nodes flow of the water supply is established. The results show that, the checked PDD model is in good agreement with the actual operation pressure of water supply network so that it can detect and evaluate the leakage control.