Abstract
This research developed a small-scale flood model that integrates Geographic Information and hydrological models. HEC-RAS model helped in simulation and to develop a relationship between runoff and rainfall in Banas River, Gujarat, India. Banas River has been taken as the study area because it is a region which was mostly flooded and having a severe effect on the Gujarat 2017 flood. This model compromises two models, a rainfall-runoff model that converts rainfall excess to surface flow and river runoff, and a second model as a hydraulic model that covers unsteady state flow through the river channel network. In HEC-RAS model, new GIS tool RAS Mapper has been used which is compatible with GIS facilities and modelling has been done with this tool. Results are also available in different parameters such as flood inundation depth, flood water velocity and time. Validation of the model is important, the results at the end of the simulation were compared with the previous observed flood water level data from past flood events in a particular fixed location. The results of this research will benefit in flood management and also used in future modelling for flood disaster forecasts.
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