This paper describes a study of the hydraulic performance of the regional sewer network of greater Tel-Aviv. The network, which is 60 Km long, serves 1.8 million people in 24 municipalities with an average flow of 340,000 m3-d-1. The study is comprised of two stages: a sampling campaign that lasted for several months followed by a simulation stage that revealed the hydraulic performance of the whole sewer network. The paper describes the methodology of the study and the results that showed that only limited segments of the network are at their full capacity and should be replaced immediately. These segments are situated at the upper end of the network. The final part of the paper discusses the contribution of the information gained by the study to the engineering department who runs the network.

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