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Flood Hazard Zonation Using Hydraulic Model of HEC-RAS in GIS


Figures 1 and 2 show the hydrological elements of water level profiles during different return period.


Figure 1. Long profile of water level for the return period of 2, 5 and 10 year.



Figure 2. Long profile of water level for the return period of 25, 50 and 100 year.


The amounts obtained in (I) condition for events 2, 3 and 4 are shown in Figures 3, 4 and 5 as simulated and observed hydrographs in hydrometry station.


Figure 3. Flood Zonation for return period of 5 year



Figure 4. Flood Zonation for return period of 50 year



Figure 5. Flood Zonation for return period of 200 year


The gained results of this study can be concluded that as most Iranian watersheds are submergible and the water resources plans are in progress, use of flood zonation models and techniques like GIS became more important than before. That is because the method is a combination of management and structures issues which makes the system more efficient and decreases the flood–induced damages. This research which is to investigate the efficiency of using GIS as a preprocessor for a comprehensive flood zonation models and to improve the flood forecasting systems in Neka watershed, is a sensible gate in comparison to other methods on this subject and in northern watersheds of Iran. In this study evaluation of the efficiency and use of GIS in hydrological model system was successful. GIS as a suitable technique prepares the great and accurate files of the watershed and is favorable for locations with ground data available. For example, the rainfall distribution and conversion to readable format by hydrological model system which combines these components in an applied hydrological models.

REFERENCES
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  8. U.S. Army Corps of Eng. (2002). HEC-RAS Refrence Manual Version 3.1.243 p.
  9. Andam, K.S. (2003). Comparing Physical Habitat Conditions in Forested and Non-Forested Streams. M.Sc. Thesis, University of Vermont . 136 p.
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