تاثير رگبارهاي منفرد بر مديريت بحران سيل (نمونه مطالعاتي حوضه فارسان)

The Effect of Single Thunders on Floodʹs Management (Case Study: Farsan Basin)

Based on studies done so far and according to rainfallsʹ durability time, the rate of damages caused by flood in smaller basins is higher than larger ones. To survey flood conditions in this basin, we analysed less than 24-hours showers and single thunders. The rate of density in different return periods and durability time, equal to concentrate time, was estimated through accounting relations. Farsan basin is a part of the great Karoon basin. This basin with a population of 60000 is economically dependent on agriculture (farming and gardening). The lands under irrigation are all located on the Farsan river terraces, and every year they are badly affected by flood event; thus the lands and water resources are threatened. Moreover, it has affected the economical progress of this area. According to the amount of the density and discharge of the rainfall, the following crisis strategies are proposed: performing biological operations in the heights, building reservoir dams, controlling the river bank, preventing and decreasing the rate of agricultural-economical damage caused by such floods.