Dear Suraj, greetings. Respectfully, I think you missed the point of the application of remote sensing and GIS technology to assessment of the estimated extent of floods of different magnitudes. It is a great "first cut" analysis that then can facilitate the planning of infrastructure to contain floods. There is no conflict between both steps in the engineering approach. Traditionally hydraulic engineers would do this first cut with topographic maps where traditional hydraulic equations would be applied to obtain a first cut estimate of the area that would be flooded by a rain of certain frequency and magnitude. This was a trial and error procedure since most topo maps have significant elevation errors. We now have the marvel of the computers and different hydraulic models that can be linked to a GIS system to do the same analysis a lot more accurate, much quicker and at a much lower cost. Still, the final design of water works to control, manage and contain floods must be based on field surveying and planning as you discussed.  GIS is only one more tool in our toolbox for the management and wise development of basins.

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Dear Suraj, greetings. Respectfully, I think you missed the point of the application of remote sensing and GIS technology to assessment of the estimated extent of floods of different magnitudes. It is a great "first cut" analysis that then can facilitate the planning of infrastructure to contain floods. There is no conflict between both steps in the engineering approach. Traditionally hydraulic engineers would do this first cut with topographic maps where traditional hydraulic equations would be applied to obtain a first cut estimate of the area that would be flooded by a rain of certain frequency and magnitude. This was a trial and error procedure since most topo maps have significant elevation errors. We now have the marvel of the computers and different hydraulic models that can be linked to a GIS system to do the same analysis a lot more accurate, much quicker and at a much lower cost. Still, the final design of water works to control, manage and contain floods must be based on field surveying and planning as you discussed.  GIS is only one more tool in our toolbox for the management and wise development of basins.