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Importance of Flood Severity Estimation for Flood Plain Management in a River Valley
Journal: Journal of River Engineering
Issue: Journal of River Engineering (Volume: 1 , Issue: 1 )
Author: Saqib Ehsan , Walter Marx , Silke Wieprecht
Keywords : flood severity , Flood plain management , Jhelum river valley , Extreme flooding , MIKE 11
Abstract:

Climate changes strongly affect the occurrence of floods. Extreme flooding can occur due to dam failure but sometimes high outflows that exceed the downstream safe channel capacity can also cause significant flooding. This paper emphasizes the importance of flood severity estimation in a river valley for long-term flood plain management. For hydraulic analysis, about 329 km long, the Jhelum river valley downstream of Mangla dam in Pakistan has been considered. The project reach has been modelled for unsteady flow conditions with MIKE 11 (1D). The flood severity has been computed downstream of the dam for different flooding scenarios by various flood severity criteria and the results have also been compared. The information about flood severity at downstream river locations plays a very important role in dealing with flood risk assessment and damage estimation. This study is intended to provide useful guidelines for the realistic estimation of flood severity in a river valley.

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