2D FLOOD SIMULATION OF NAGAVALI RIVER BASIN USING HMS AND RAS
Keywords:
Flash Flood, Rainfall, Model, Runoff, SimulationAbstract
Nagavali River Basin is one of the important east-flowing rivers between Rushikulya and Godavari in Odisha and Andhra Pradesh states in India. The river originates from the hill near Lakhbahal village in Thuamul Rampur block in Kalahandi District and Kalyansinghpur in Rayagada district in Odisha and travels for a distance of about 256 km. the total catchment area of the river basin is 9205 sq.km. The length of the Nagavali river is 161 km in Odisha and the remaining 95 km is in Andhra Pradesh and lies within the geographical co-ordinates of 180 30' to 190 30' North latitudes and 830 00' to 840 00' East longitudes. Nagavali River is a non-perennial river and heavy floods occurred in the river during the 2006 monsoon season over the period of 50 years period from 1971-2020 the river was over flooded which caused lots of losses either economic or damaged the property. In this paper, the methodological approach was adopted, focused on the hydrologic modelling through the Hydrologic Engineering Centre Hydrologic Modelling System (HEC-HMS) and the hydrodynamic modelling with the Hydrologic Engineering Centre River Analysis System (HEC-RAS). The aim of this study was to flood inundation behaviour of the Nagavali river basin during extreme flood events in 2006 year. 2-D HEC RAS model was simulated by using output results of HEC HMS runoff depth/excess rainfall and simulated results of Srikakulam GD station (R2 is 0.625) match well with the observed data. Flash flood model is very useful for flood warning systems by generating pre-flood inundation maps and decision-makers.
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