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Flood Estimation Studies for Lower Tapi—A Case Study
Flood is the most common and widespread natural severe weather event. A flood occurs when water levels rise over the top of river banks. In recent times, several Indian coastal cities such as Surat, Mumbai and Chennai have witnessed unprecedented flooding due to various causes such as heavy downpour, releases from the upstream dams, poor urban planning. In the urban flood-prone areas, it is essential to estimate the peak flood, time of peak, flood response of contributing catchments for planning, riverfront development (RFD) works, etc. The extreme rainfall depth and the catchment physiographic characteristics are required for the estimation of peak flood. Surat is one of the cities of Gujarat, situated in Lower Tapi Basin (LTB). The LTB is a flood-prone area and also witnessed at least ten major floods in the past century out of which the worst one was 2006. In view of the above, Surat Municipal Corporation (SMC) has a proposal of RFD for Tapi with in Surat City to minimize the devastation due to flooding as well as improve the aesthetic view. On request of SMC, CWPRS carried out flood estimation study for RFD works of Tapi. The present paper is a case study related to flood estimation at location of interests on Tapi, i.e. Kathore Bridge, Singanpur Weir and ONGC Bridge. For this study, delineation of LTB sub-catchments (i.e. downstream of Ukai Dam) and extraction of the physiographic parameters and also extreme value analysis IMD rainfall data were carried out. Estimation peak flood of contributing catchments of LTB for 25-yr, 50-yr and 100-yr return periods were carried out by adopting the CWC flood report (sub-zone-3B). Further, the peak flood of LTB catchments and Ukai Dam discharges were considered for the estimation of peak flood at location of interests.
Flood Estimation Studies for Lower Tapi—A Case Study
Flood is the most common and widespread natural severe weather event. A flood occurs when water levels rise over the top of river banks. In recent times, several Indian coastal cities such as Surat, Mumbai and Chennai have witnessed unprecedented flooding due to various causes such as heavy downpour, releases from the upstream dams, poor urban planning. In the urban flood-prone areas, it is essential to estimate the peak flood, time of peak, flood response of contributing catchments for planning, riverfront development (RFD) works, etc. The extreme rainfall depth and the catchment physiographic characteristics are required for the estimation of peak flood. Surat is one of the cities of Gujarat, situated in Lower Tapi Basin (LTB). The LTB is a flood-prone area and also witnessed at least ten major floods in the past century out of which the worst one was 2006. In view of the above, Surat Municipal Corporation (SMC) has a proposal of RFD for Tapi with in Surat City to minimize the devastation due to flooding as well as improve the aesthetic view. On request of SMC, CWPRS carried out flood estimation study for RFD works of Tapi. The present paper is a case study related to flood estimation at location of interests on Tapi, i.e. Kathore Bridge, Singanpur Weir and ONGC Bridge. For this study, delineation of LTB sub-catchments (i.e. downstream of Ukai Dam) and extraction of the physiographic parameters and also extreme value analysis IMD rainfall data were carried out. Estimation peak flood of contributing catchments of LTB for 25-yr, 50-yr and 100-yr return periods were carried out by adopting the CWC flood report (sub-zone-3B). Further, the peak flood of LTB catchments and Ukai Dam discharges were considered for the estimation of peak flood at location of interests.
Flood Estimation Studies for Lower Tapi—A Case Study
Lecture Notes in Civil Engineering
Timbadiya, P. V. (editor) / Patel, Prem Lal (editor) / Singh, Vijay P. (editor) / Manekar, Vivek L. (editor) / Patra, Annapurna (author) / Chowdhury, Ujjal (author) / Srishailam, C. (author)
International Conference on Hydraulics, Water Resources and Coastal Engineering ; 2021
2023-09-01
10 pages
Article/Chapter (Book)
Electronic Resource
English
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