In the current generation due to climate change, many regions of the earth are facing extreme weather conditions. India also facing adverse effects like atypical floods and droughts due to climate change. Extreme floods are now a common phenomenon in lower Himalayan regions. Many cities and towns of the hills are adversely affected by these events. Central Water Commission (CWC) has published probable maximum precipitation (PMP) atlas for major river basins of India. In which, the current study is based on the PMP atlas for Ganga River Basin. CWC has provided the isohyetal maps of precipitation for various return periods and duration. It is difficult to have a specific precipitation estimation of any subbasin in this large river basin. So, the current study focuses on the precipitation value estimation of Tehri Subbasin of Ganga River. Isohyetal map of 24-h (1 day) duration and different return periods is used in this study. The hourly time distribution function is calculated from station wise rain spells. The catchment delineation is processed by taking Tehri Dam as an outlet. Each specific sub-watershed consists of a precipitation value. GIS tools are used to extract the precipitation value of each subbasin from the isohyetal map. The datasets were used to generate probable maximum flood (PMF) graphs from a calibrated hydrological model of the study area. The data validation has been done by performing hydrologic modeling of Tehri Catchment and comparing it with the designed PMF of Tehri Dam which is 15,500 cumec. The resulting hydrological model for the extreme event has generated 15,883 cumec of inflow at the Tehri Dam which showed quite similar results with the designed PMF of Tehri Dam. The results have shown that PMP atlas can be very useful to study the hydrological applications of extreme events.
PMF Estimation for Extreme Events from PMP Atlas, a GIS, and Hydrologic Model-Based Case Study in Tehri Catchment
Lecture Notes in Civil Engineering
International Conference on Hydraulics, Water Resources and Coastal Engineering ; 2021 December 23, 2021 - December 25, 2021
2023-05-01
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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