IR-TEHRAN DRAINAGE

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The objectives of the Tehran Drainage Project are to: 1) provide storm water drainage to divert flood waters away from flood-prone areas of the city for the protection of human life and property; 2) transfer appropriate technology for constructing tunnels; and 3) strengthen the city's institutional capacity through technical assistance for project planning and implementation, and for sound municipal finance management. The project will reduce the health risks posed by sewage overflows onto streets and will minimize water logging and flooding problems in the low-income areas to the south of the city. The project includes two major subprojects, namely a trunk tunnel and lateral drains and appurtenances, which are required to intercept rainwater runoff collected in the central part of Tehran; and a main interceptor and outfall system consisting of a tunnel, an open channel, a retention reservoir, and a pipe outfall to the Kan River. The system will protect the central part of Tehran and the low-lying areas to the south of the city from frequent floods.