Title: Identification of flood vulnerable zones in Mahanadi delta based on post-Hirakud historical data
Authors: Anil Kumar Kar; Krishna Kumar Gupta; Joygopal Jena; Dipti Ranjan Jena
Addresses: Department of Civil Engineering, Veer Surendra Sai University of Technology, Burla-768018, Sambalpur, Odisha, India ' Department of Civil Engineering, SOA University, Khandagiri Square, Bhabaneswar-751030, Odisha, India ' Department of Civil Engineering, Gandhi Institute for Technological Advancement, Badaraghunathpur, Beside NH-5, Janla, Bhubaneswar-752054, Odisha, India ' Secha Sadan, Keshari Nagar, Unit-5, Bhubansewar-751001, Odisha, India
Abstract: The Mahanadi basin having a large catchment faces hydro-climatic variations. In this study entire catchment of Mahanadi is divided into 10 x 10 grids. Those grids are considered which are covering either fully or partly the basin catchment (at least 25% or more). The gridwise rainfall data are analysed for each flood between 1958-2004. At least 15 days daily rainfall of all the grids prior to a particular flood is considered to find the vulnerable grid for that particular flood. These grids are further analysed statistically to find the possible reasons for occurrence of floods. No increasing trend in rainfall is found over the grids. It is also observed that the decrease in rainy days and more rainfalls in a short period of time remain the reasons for formation of peak floods at the delta. Besides that higher one-day maximum rainfall also makes a concern for floods.
Keywords: gridded rainfall; Mahanadi; Hirakud; vulnerable zone; trend; dam release; flood peak; intercepted catchment; Mahanadi delta.
International Journal of Water, 2019 Vol.13 No.2, pp.139 - 150
Received: 11 Apr 2018
Accepted: 14 Sep 2018
Published online: 07 May 2019 *