This book is based on the one dimensional hydrodynamic model simulation of flood map of one of the largest river basin i.e. Narayani River floodplain, located in the Central zone of Nepal. The study area covers around twenty kilometers of the flood area located at the upper stream of the bridge section in East West Highway of Narayani River. The precipitation data collected from the Department of Hydrology has been used to calculate the four scenario (100, 200, 500 and 1000 years) flood analysis from Gumbell method. The digital model is developed through ARCGIS by feeding the Gumbell analyzed...