Report on Modeling and management of erosion and sedimentation processes in a stretch of Gandak River using morphodynamic modeling :A Purpose Driven Study under National Hydrology Project (PDS NO: NIH-34 _ 2019 _107)

Abstract

A project proposal entitled “Modelling and management of erosion and sedimentation processes in alluvial river using morphodynamic modelling” was submitted to National Hydrology Project (NHP) as Purpose Driven Study (PDS) in May 2019. National Institute of Hydrology (NIH), Patna is the lead organization and Water Recourses Department (WRD), Government of Bihar (GoB) is the partner organization in this PDS study. WRD nominated officials from Flood Management Improvement Support Centre (FMISC), WRD GoB as Principal Investigator (PI) and Co-PI (Annexure-I). The partner organization has the responsibility of providing the logistic support during field visit, data support and identification of a study site. Altogether 15 vulnerable sites (8 on Gandak river, 6 on Kosi river and one on Ganga river) were intimated by FMISC (Annexure-II). For this study the site one Gandak river from Kunwari village (near 47 km. of Saran Embankment) in u/s of Rewa Ghat up to Baligaon (near 30 km. of Saran Embankment) in d/s of Rewa Ghat bridge was finalized in consultation with FMISC. The main reason for selection of this stretch was its vulnerability to bank erosion at several locations and many anti-erosion works have been carried out in this stretch. However, the problem is not limited to this stretch and is widely spread over the entire alluvial stretch of Gangetic plain, and therefore, the lesson learnt from the specific study may be transferred to other reaches aslso.