Investigation of Quantitative and Qualitative Characteristics of Inflow to the Proposed Urban Lake at the West of Great Tehran

According to the natural and man-made environment of Tehran and based on government approval, the largest artificial lake located in far northwest of great Tehran and into the new made District-22 of Tehran Municipality is being designed. This region with and area of about 10000 hectares has been planned as a last connatural limitation of Tehran. Overflow of the Kan and the Vardavrd Rivers such as the one in 1969 in the Kan-Sologhan region and some other purposes like providing a recreational place to attract tourists and making the weather fresh and humid specially in dry seasons turn out to be the reasons for proposing the construction of an artificial lake. The lake is planned with an area of about 225 hectares and 11 million cubic meters volume. The Kan and the Vardavard Rivers, the middle part watershed basins runoff, groundwater, municipal runoff and the waste water of Ekbatan treatment plant are the most important water resources in the area. Annual flow of these resources together is about 120 million cubic meters and there is the possibility of taking 40 million cubic meters of this flow to provide the lake water. To indentify the water quality of resources, samples were taken, analyzed and statistics of hydrometric stations in the region have been assessed. Comparison between these results and standards proved that the Kan and the Vardavard Rivers, groundwater’s and the middle part watershed basins runoff have the highest quality. In Ekbatan treatment plant wastewater and municipal runoff total coliformis 1.1×104 MPN/100ml and 2.2×1029 MPN/100ml respectively which is higher than standards and inappropriate to provide the lake water.