Document Type : Original Articles


Department of Environment Planning, Faculty of Environment, Tehran University


Karaj dam watershed which is the main source of drinking water for the city of Tehran and the surrounding area has been confronted with a reduction of water quality in the recent years. Ecological land use evaluation using GIS aimed to determining suitability of existent land uses, analysis of 10 years (1998-2007) water pollutant averages for determining the river quality and SWOT analysis for recognizing weakness and threats of water quality and strengths and opportunities for its improvement have all been used in this research. The results of these 3 methods have been integrated into a hierarchical process for the zoning of Karaj dam watersheds polluting potentials. As a result five zones - very few, few, average, high and very high pollution potentials - have been identified. The decision making process for reducing the pollution potential of basin zones may be facilitated by taking into consideration the zoning and the time/budget constraints. Keywords: Zoning, Karaj dam, Polluting potential, Ecological land use evaluation, SWOT.