MODELING CHLORINE RESIDUALS IN URBAN WATER DISTRIBUTION NETWORKS (AL-ASHRAFIEH – HOMS)

Maintaining water quality in the water distribution networks has become a prominent issue. Chlorine Residual is an indicator to ensure water quality in the network A hydraulic analysis of the water distribution network in the Al-Ashrafieh city in Homs governorate was used to determine the chlorine residual concentration in the network. Samples were collected from the network to determine the percentage of free residual chlorine at three points and to compare with the program results. The results of the program represent a good simulation of field values, with an error less than 5%, RMSE = 0.02, 0.1, 0.02 for nodes 14, 11, and 3 respectively. The simulation showed that chlorine values in the network were within the permissible values in more than 95% of the network pipes, where Chlorine values decrease at peak times and at high-pressure values. Available data indicate a decrease in the percentage of free residual chlorine at some points. Three support point scenarios were studied, where the UCC (Uniform Chlorine Coefficients) increases when the support is used by using number of points of support near the pipes that has the low levels of chlorine from a value of 0.84 to 0.9.