The Cauvery Division consist of 47 hydrological observation sites including 46 Discharge sites and 1 gauge site on the main Cauvery basin, Tungabhadra, Ghataprabha, Malaprabha sub-basin of Krishna and three sub-basins (Kajvi, Gad & Mandovi) on Tapi &Tadri basin covering most parts of Karnataka, as well as part of Maharashtra, Goa and Kerala. In addition to this, 32 telemetry stations come under the jurisdiction of Cauvery Division. The telemetry stations include 21 rainfall & water level stations and 11 exclusive rainfall stations. Six telemetry stations are on reservoirs/dams. The jurisdiction of this Division covers some of the flood prone areas of the country.
The overall magnitude of floods in the rivers under this Division during the flood season 2021 is estimated as “Normal” considering that above normal floods have been observed in the rivers in Cauvery basin and Krishna Basin. As per IMD records, the overall rainfall recorded during the monsoon season (June to September) 2021 was about 3 % excess in Karnataka, 19 % excess in Maharashtra, 5 % excess in Goa and 16 % deficit in Kerala in comparison to the normal rainfall of these regions. In 2021, in all the 8 inflow forecast stations, a total of 606 forecast were issued for 8 reservoirs/dams during the flood season (June to December) with performance accuracy of 90.26 %.
The daily Hydro-Met bulletins were prepared and sent through e-mails to the Departmental higher authorities as well as other user agencies as a step towards faster dissemination of Water level, Rainfall and Flood forecasts. The Cauvery Division were kept functioning on 24 X 7 basis daily during the flood season of 2021 for reception and transmission of data. Flood forecasts were regularly incorporated in the Water Information Management System through the official website of CWC „https://india-water.gov.in/wims/login.xhtml” on hourly basis round the clock. Necessary communication was maintained throughout the flood season with the Local Civil Administration and Engineering authorities.
This report has been prepared in order to give the details of the Flood Forecasting activities in the Hydro-met section of the Cauvery Division in a systematic manner. At the end of every monsoon season, an appraisal is required to analyse the performance and the accuracy of forecasts issued and to identify the shortcomings if any, in the system and to device a methodology for taking remedial measures to improve the future forecasting. This appraisal report is based on the guidelines issued by the Central Water Commission, New Delhi.
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