Abstract
ABSTRACT Dam breach or dam break causes release of large quantity of storage water from the reservoir creating major flood wave capable of causing disastrous damage to the downstream residents and property. The preparedness to withstand such an eventuality by predicting the possible extent of inundation of downstream zone and by formulating the emergency action plan can mitigate the disaster. The present study aims at predicting the characteristics of the flood wave such as peak flood stage, peak flood discharge and their times of occurrence and stage and discharge hydrographs at different locations downstream in the river due to Tehri dam-breach flood and also for monsoon flood. NWS-BREACH model is used for Tehri dam on the Ganga river, to predict the breach characteristics and the breach hydrograph. The predicted dam-breach flood hydrograph is routed through the Ganga river system using NWS-FLDWAV model, assuming that all the major tributaries joining the downstream Ganga river are already in flood state. The monsoon flood is also routed through the Ganga river system using NWS- FLDWAV. The dam-breach flood wave characteristics at different locations along the downstream of main river and its tributaries are predicted, and the results are discussed. The results of dam-breach flood routing are compared with those of estimated from the monsoon flood routing.
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