Flood Level Mitigation Study Using 1-D Hydrodynamic Modeling

Abstract

The Lhasi Nadi is a tributary of the Andheri River, which is a tributary in the Chambal River basin, India. A specific part of the Lhasi catchment faces the risk of being flooded and this, in turn, restricts any industrial or residential development in the area. The present paper concerns with a study which aims to model the hydrodynamic transport of flood runoff in Lhasi and simulate, through numerical modeling, the maximum anticipated flood water levels that are likely to be realized at various locations along the course of river Lhasi corresponding to some identified extreme rainfall events having specified return periods. The study also aims at finding the specific reason for the occurrence of floods in the region and the possible measure to be taken so that there are no severe flood events in the coming future. The study proposes to use observed and indirect estimates of water levels at the Lhasi Railway Bridge site (a nearby location) following the flood event of July, 2000 as a benchmark for reference. In the process of study ArcGIS, SWAT (Soil and Water Assessment Tool) and MIKE (DHI) software packages have been used for the study. To understand the impact of bed geometry of Lhasi and flows in Andheri on the water surface profiles as they develop in Lhasi, hydrodynamic simulations of water surface profiles were derived for various flow scenarios and concluded in suggesting site specific preventive measures for the annual floods.