The Analysis of Synoptic Conditions of Flood Occurrence in Heavy Rainfalls (Koohrang County)

In this paper we study the heavy precipitation and probability of occurring flood as a result of it for Koohrang station. The synoptic and discharge maps were chosen and drawn in purpose of showing the discharge peak for 29 February by175 mm rainfall. In this day a low pressure center was located in Greek. As this center expanded to the north، the thermal low pressure above the Sudan and Saudi Arabia became dynamic and stretched toward the west of Iran. According to the sea surface، 500 mb and moisture flow، this heavy rainfall was the result of the instability from surface to 500 geopotential levels and generated 5. 7 m2/s discharges in the regain.