Influence of Road-Stream Crossing on the Initiation of Gully: Case Study from the Terai Region of Eastern India
The undersized road-stream crossing (RSC) creates the severe problem of soil loss over the landscape of Terai Region, especially in and around the tea estate due to the unconsolidated and fragile condition of the underlying geology. Artificial channel routing for the irrigation of tea gardens has increased the drainage density and decreased the concentration time of runoff at the inlet of RSC. Due to the underestimation of typical hydrology of upstream tea gardens at Site C, the downstream of studied RSC faces unexpected changes in channel geometry between upstream and downstream. The typical hydraulics of Site C has induced an increase in the channel width (480%), depth (560%), and cross-section area (3728%) in the downstream in comparison with its upstream and formed a 981 m-long enormous gully with an area of 5.49 ha, average depth of 12 m, and width of 14–49 m. The comparative study between three RSCs in the same region shows that the process of gully erosion varies with the size of crossing structure and the nature of upstream drainage networks and condition of the riparian zone.
KeywordsRoad-stream crossing Gully Terai region Soil loss Drainage network
Infrastructural facilities were provided by the Department of Geography, Kalipada Ghosh Tarai Mahavidyalaya (KGTM), Bagdogra, Siliguri, West Bengal. Assistance from Mr. Chinmoy Sarkar and Dr. Shayam Charan Barma, Assistant Professors of the Department of Sociology and Economics, respectively, KGTM, during fieldwork was gratefully acknowledged.
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