Flood events in the rivers are increasing across the world due to the possible impact of climate change. In the case of reservoirs, flood routing is becoming very important to reduce the damage to the downstream area. The operation of reservoirs needs reliable information on inflow in real time. In the case of an ungauged catchment, it is difficult to apply rainfall-runoff simulation models. In small catchments, the lag time is also very short, and long-term prediction is very difficult to operate reservoirs in case of flood situations. In this study, a hybrid reservoir inflow forecasting model is developed for the Ajwa-Pratappura twin reservoir system. Ajwa and Pratappura reservoirs are constructed to supply the drinking water to Vadodara City. The combined catchment area is 203 km2. Aasoj feeder canal diverts the water from Pratappura reservoir to Ajwa Reservoir. Ajwa Reservoir has a storage capacity of 2240 MCFT. During heavy flood events, both the reservoirs release water into the Vishwamitri River which is passing through the Vadodara City. A careful operation of the Ajwa Reservoir is very much required to manage the flood downstream covering the city area of Vadodara. The objective of the present study is to predict the reservoir water level based on a short-term inflow forecast at the Ajwa-Pratappura Reservoir system. A mathematical model based on the SCS curve number is developed to predict the inflows from the catchment of both the reservoirs during storm events. Catchment delineation is done using DEM data from ISRO-BHUVAN using QGIS. Major storm years from 2015 to 2020 are selected to calibrate and validate the model. The model is further coupled to use 3 h of forecast data of Vadodara Station from meteograms generated through the IMD-GFS model. The framework developed for the inflow prediction is found to have high applicability for generating early warnings and for reservoir operation.
Development of Short-Term Reservoir Level Forecasting Models: A Case Study of Ajwa-Pratappura Reservoir System of Vishwamitri River Basin of Central Gujarat
Lecture Notes in Civil Engineering
International Conference on Hydraulics, Water Resources and Coastal Engineering ; 2021 December 23, 2021 - December 25, 2021
2023-05-01
9 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch