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NPCIL has proposed to install an interstate multipurpose Nuclear Power Project of Rajasthan and Gujarat states at Mahi Bajaj Sagar reservoir catchment in Banswara district, Rajasthan state. The project authority refers the studies (CWPRS in Pune Technical Report No. 5876. Bathymetry and Sedimentation studies of Mahi Bajaj Sagar reservoir in Banswara, Rajasthan using Integrated Bathymetry System, 2021) to Central Water and Power Research Station (CWPRS), Pune to evaluate present storage capacity, depth contour plots, find out deep pockets for intake for the proposed and estimate siltation pattern (Selva Balan et al. in Reservoir sediment classification and quantization using adaptive imaging technique. Presented in IAHR conference in Colombo, Srilanka during 28–31, August 2016). The study also includes finding out the possible methods to enhance dam water storage capacity by means of siltation removal from reservoirs. Instrumentation Division of CWPRS has carried out hydrographic survey of Mahi Bajaj Sagar reservoir during December 2019 by using dual frequency echo-sounder sensor, Differential Global Positioning System along with antenna and other auxiliary types of equipment firmly fixed to a survey boat. The IBS was expected to have depth accuracy in sub meters. The hydrographic survey was done at water level 280 m RL. FRL is at 281.50 m. Data was collected using a model of echo GPS and Hypack navigation software which generates data sheets having x, y, z data in excel format. Data analysis was carried out using various software viz. Surfer, Autocad ( www.autodesk.com ), QGIS and results obtained such as live storage, silt quantity, deep pockets for intake and contour plot up to FRL. The reservoir live storage capacity is calculated for water spread area of 106.11 sq. km. at water level of RL. 280 m. Reservoir capacity at survey level is 1634.28 MCM and the same when extrapolated up to FRL is 1822.30 MCM. Loss of volume is calculated based on original capacity table provided by project authority. When extrapolated to FRL i.e. 281.5 m the loss of capacity is 358 MCM, which is 16% of original designed capacity.

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Bathymetry and Sedimentation Studies of Mahi Bajaj Sagar Reservoir in Banswara, Rajasthan Using Integrated Bathymetry System—A Case Study

  • 会议论文

  • 发表日期：

    2025年

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  • Selva M. Balan,
  • M. S. Bist,
  • Ajit Singh,
  • Sampath Sreekanth,
  • Prabhat Chandra

摘要

NPCIL has proposed to install an interstate multipurpose Nuclear Power Project of Rajasthan and Gujarat states at Mahi Bajaj Sagar reservoir catchment in Banswara district, Rajasthan state. The project authority refers the studies (CWPRS in Pune Technical Report No. 5876. Bathymetry and Sedimentation studies of Mahi Bajaj Sagar reservoir in Banswara, Rajasthan using Integrated Bathymetry System, 2021) to Central Water and Power Research Station (CWPRS), Pune to evaluate present storage capacity, depth contour plots, find out deep pockets for intake for the proposed and estimate siltation pattern (Selva Balan et al. in Reservoir sediment classification and quantization using adaptive imaging technique. Presented in IAHR conference in Colombo, Srilanka during 28–31, August 2016). The study also includes finding out the possible methods to enhance dam water storage capacity by means of siltation removal from reservoirs. Instrumentation Division of CWPRS has carried out hydrographic survey of Mahi Bajaj Sagar reservoir during December 2019 by using dual frequency echo-sounder sensor, Differential Global Positioning System along with antenna and other auxiliary types of equipment firmly fixed to a survey boat. The IBS was expected to have depth accuracy in sub meters. The hydrographic survey was done at water level 280 m RL. FRL is at 281.50 m. Data was collected using a model of echo GPS and Hypack navigation software which generates data sheets having x, y, z data in excel format. Data analysis was carried out using various software viz. Surfer, Autocad ( www.autodesk.com ), QGIS and results obtained such as live storage, silt quantity, deep pockets for intake and contour plot up to FRL. The reservoir live storage capacity is calculated for water spread area of 106.11 sq. km. at water level of RL. 280 m. Reservoir capacity at survey level is 1634.28 MCM and the same when extrapolated up to FRL is 1822.30 MCM. Loss of volume is calculated based on original capacity table provided by project authority. When extrapolated to FRL i.e. 281.5 m the loss of capacity is 358 MCM, which is 16% of original designed capacity.