Maroon Dam with maximum volume of 1274 MCM was built on this river by Khuzestan Water & Power Authority (Dams Identity). The dam Controls the Destroyer Floods and adjusts water And Energy and prevents from seasonal high flood damages and saves large amounts of water for agricultural consumptions. The river has flash floods with high peaks, so it seems that flood control and management are cases of high importance in this catchment and it is necessary to have information about flood volume for flood management, downstream programming and consumption estimation. In this study, Flood Hydrographs Analysis was used to check inlet Hydrological regime to the reservoir and Flood Events and To Assess Flood Control Volume of reservoir With Entrance Flood events relatively. Also this study is tried to Analysis the Act of Medial Basin. The Results Indicated that Only in The Rare Cases Flood’s volume was More Than Reservoir Control volume. So One Can simply Decrease Flood Control Volume and use it To Supply Water and Energy Requirement goals. in the Terms of Quantitative, Simply can Dedicated Within Amount 140 Million cubic meters of Flood control Reservoir For other needs that Confidence in this Volume is At least 90% Observed events .