Designing Flood Hydrograph by Multicharacteristic Synthesis Index Method
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Abstract
Hydrograph derived from various storm events has the different characteristics of the hydrological response such as flood peak, maximum flood volumes at various time durations or time to peak flows etc. These differences have led the significant manners in water resource management. Flood hydrographs at various return periods are important information in reservoir design and management. Most of the flood hydrograph designing methods are developed base upon one specific characteristic individually like flood peak or maximum flood volumes at specific time duration. This lets the development of the design flood hydrograph was limited by some characteristics of flood response. This research developed flood hydrograph designing by considering several characteristics of flood namely flood peak, 1, 3, 5 and 7–day flood volumes. These characterisics were examined and jointly synthesized a representative index by using Multicharacteristic Synthesis Index (MSI) method. The MSI values were then used to design flood hydrographs. When the runoff data at N.13A were diagnosed, the results showed that 7–day flood volume is a significant characteristic affecting the shape of hydrograph with the highest weight. It was also found that the characteristics of design flood hydrograph is relatively subject to the multicharacteristics of flood response taken place in the basin. This shows that multicharacteristic synthesis index method can be used to design flood hydrograph corresponding to flood events occurred in the area.
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