On July, 1987, a devastating flash flood occurred on northern Tehran the capital of Iran. The addressed basin catchment (named Golabdareh&darband) discharged about 250m3/s runoff (excluded mud flow) in 30Km2 watershed area that caused more than 300 casualties and a large amount of losses to public and
individual properties. A huge amount of mud, boulders and stones were deposited on the streets in an urban area. Many houses and other proprieties were also buried under sediments (Kuritkara Co.2006).
Flash floods happen in a very suddenly gesture that cause huge amount of damages to urban facilities, foundations and human lives in no time taking into consideration the main reasons as decreased humanbasin interface which leads vast modifications in hydrological characterizations of basin. The management of emergencies, resulting from natural or man-made disasters, requires enough information as well as experienced responders both in technical and co-ordination matters (Hernandez&Serrano,2001). Information requirements may be partially satisfied with the development of telematics systems which make it feasible to build up applications integrating sensors, communications and real-time data bases to provide raw information about the state of a natural or artificial installation
such as a chemical plant or a watershed. In this way, a great amount of information is available that should be used to improve the management of the emergency, which generally means making the best decision at the right moment. In order to support the decision-makers in the evaluation of this raw information, knowledge-based systems (KBS) are good candidates, as they are able to integrate both theoretical and common sense knowledge directly taken from the expert decision-makers. Furthermore, KBS are able to provide explanations of their recommendations; this is of fundamental importance in any emergency domain, as the responsible personnel cannot adopt a decision and response to the event without fully understands it (Hernandez&Serrano, 2001).
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