Abstract
The rain warning indicator is an important basis for early warning of Flash Flood. In this study, a semi-distributed hydrological model for small watershed was established based on NAM. Combined with 19990811, 20080817 and 20150805, three floods and floods are used to determine the watershed. - The elevation judgment model of the residents along the line, combined with the results of the on-site investigation to locate the households with the weakest flood control capacity in the village, establishment of flood water level and height determination model for residents along the line, using the method of water level and flow back to deduce the disaster volume of disaster prevention targets; Prediction of rainfall early warning indicators based on model trial method to reach disaster level. The results show that the NAM model can better simulate the rainfall runoff process in the basin and can be applied to the early warning indicators of the basin.
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