FLOOD MAPPING IN GREATER NOIDA USING ArcGIS AND HECRAS

Abstract

Floods are considered major hazardous processes, given the rising number of events, the large number of people affected, the associated damage and losses and the growing socioeconomic impacts which cause widespread disturbance. Hydraulic modeling is an important tool for a reliable flood forecasting system. Simulation results from hydraulic modelling can be used to produce flood inundation mapping that community officials or the general public can deploy to evaluate their flood risk. Mapping a floodplain requires the forecasting of the stream behaviour for various recurrence intervals, storm events and the ability to translate the forecasted results into an extent of flooding plan view. With the companion GIS utility HEC-Geo RAS, water surface profile can easily be converted into flood inundation maps. The present work discusses general hydraulic modelling and softwares as applied to some select area of western of Uttar Pradesh. 1-D hydraulic model HEC-RAS of steady flow, using a higher resolution topographic surface including hydro geomorphological details and other features influencing hydraulic characteristics, was applied to Hasanpur drain as well as urban and rural areas in order to determine the flood prone areas for a return period of 2,10and 25 years.