Flood Risk Mapping and Analysis Using Hydrodynamic Model HEC-RAS: A Case Study of Daraudi River, Chhepatar, Gorkha, Nepal
Journal Title: Grassroots Journal of Natural Resources - Year 2019, Vol 2, Issue 03
Abstract
Nepal has been ranked as one of the most multiple hazard prone countries in the world. Studies claim flood as the most common and third most deadly disaster in Nepal. It causes loss of life, casualties, financial loss and displacement. Heavy monsoon, fragile geography, constructions along the embankments and mining in the upstream riverbeds cause the river to flood. Daraudi River, one of the seven tributaries of Gandaki River, experience flood every year. Despite regular flooding, no studies have been carried out in the river zone. Hence, this study is carried out in the Chhepetar flood plain of Daraudi River basin. This article is based on a study that used HEC-RAS, HEC-GeoRAS and ArcGIS for preparation of 1D flood plain maps and WECS/DHM method to analyze the flood frequency in different return periods. The flooding in the river is found to be correlated with maximum rainfall in a year and occurs particularly between June and September every year – the period of Monsoon season in Nepal. A direct relationship between the inundation area and the flood discharge of various return periods has been identified. Plantation, bioengineering technique, dry wall construction on the river bank and different non-structural approaches of flood management have been suggested by the study for eco-restoration.
Authors and Affiliations
Pratibha Banstola, Bidhan Sapkota
Keywords
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- EP ID EP695120
- DOI 10.33002/nr2581.6853.02033
- Views 124
- Downloads 0
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