Journal of Food, Agriculture and Environment

Assessment of changes in hydrologic regime of the Teesta River by Teesta–V Hydroelectric Power Project in Sikkim India


Timsina Kausila

Recieved Date: 2020-07-12, Accepted Date: 2020-09-08


Hydrologic studies and its linkages to the socioeconomic and environmental bearings have been scarce in the Himalayan state of Sikkim. The present study assesses the changes in hydrologic regime of the 4657 km2 Teesta-Dikchu watershed (name given for the present study) located 88°13’E, 28°12N’ to 88°51’ E to 27°20’N, by the construction of the Teesta V hydroelectric power project. The study uses the SWAT hydrological model to generate a 30 years of continues time series flow data (calibrated and validated) and the Indicators of Hydrologic Alteration (IHA) as an analysis tool to understand the changes. Thus the highest hydrologic alteration factors of Teesta V dam construction pre and post construction are seen as the median of monthly flow indicating a decreasing trend compared to the pre dam construction period. While the magnitude and duration of extreme flow events show a decreasing trend indicating the daily weekly, monthly and quarterly minimum flow cycle are negatively influenced by the reservoir regulation.


SWAT, IHA, Sikkim, Teesta

Journal: Journal of Food, Agriculture and Environment
Year: 2020
Volume: 18
Issue: 3&4
Category: Environment
Pages: 122-134

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