Use of a Hydrodynamic Model to Forecast Floods of Ambica River in Navsari Region

Using HEC-RAS hydrodynamic model, the levels of peak floods at different locks of Ambica River reach between Padam Dungari and Sidhai Village for 1984 and 1994 year floods. Based on the simulation study carried out considering 23 cross sections for 9km length of river, it is observed that the heightening of embankment system for almost all the existing bank stations both in the left and right embankments are required. In the present study, the analysis has been carried out considering 1984 and 1994 year flood (11000 and 6500 cumecs), as this flood is considered as most significant and under changed climatic conditions. The model was calibrated and verified for steady flow conditions. t provides water levels and inundation areas along the river for two flood events. The result of the study show that out 23 cross sections, 14 cross sections are classified as highly critical, moderately critical and critical. The flood can be predicted with steady flow data which would be useful in development of flood protection measures like levees along the Ambica River.