I am working to predict flood in a basin of NE India with ArcGis, but I am not able to make the velocity field for it. Give me some suggestions to do my work.
You can try the hydrology tools in ArcGIS for developing unit hydrographs on a cell by cell basis for a watershed. A reference you could use is:
https://onlinelibrary.wiley.com/doi/abs/10.1002/(SICI)1099-1085(199606)10:6%3C831::AID-HYP374%3E3.0.CO;2-N?casa_token=6inN_4aWHK8AAAAA%3AtjTD_g-9B8BxaRQb3e3lFQZ6cbIHonyXeB3nNGSUlMHSCJlkU0tMJEZYDZiXE4-YsGBlxKltAMB6iOm9
I think you may use HEC-RAS to generate inundation scenarios for your specified discharges at certain locations. Such discharges may be design discharge or any other specific discharge. Then import the tiff files (output of HEC-RAS) back to GIS using GeoRAS and you can also bring back the velocity component as well. This will give you the velocity of flow in the channel and other hydraulic structures.
Tehrany, M. S., Pradhan, B., Mansor, S., & Ahmad, N. (2015). Flood susceptibility assessment using GIS-based support vector machine model with different kernel types. Catena, 125, 91-101.
Yang, J., Townsend, R. D., & Daneshfar, B. (2006). Applying the HEC-RAS model and GIS techniques in river network floodplain delineation. Canadian Journal of Civil Engineering, 33(1), 19-28.
Konadu, D. D., & Fosu, C. (2009). Digital elevation models and GIS for watershed modelling and flood prediction–a case study of Accra Ghana. In Appropriate Technologies for Environmental Protection in the Developing World (pp. 325-332). Springer, Dordrecht.
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