Geotechnical & sub soil investigations report of Kumari dam, West Bengal

Wapcos Ltd.

Kumari Dam, West Bengal

SERVICE CATEGORYGeotechnical SectorWater Resource Engineering

In West Bengal many of these dams are in urgent need of strengthening and rehabilitation to ensure their safety and to improve their performance. It was a significant steps of Wapcos Ltd. to entrust M/S BPC Consultant India Pvt. Ltd. to conduct Geotechnical studies by exploration of Bore holes for conducting In-situ Permeability Test, collecting undisturbed samples and Laboratory test for various earthen dams in West Bengal.

The Kangsabati River (also variously known as the Kasai and Cossye) rises from the Chota Nagpur Plateau in West Bengal, and passes through the districts of Purulia, Bankura and Paschim Medinipur district in West Bengal before draining in the Bay of Bengal, 2 kilometres (1.2 mi) from Mukutmonipur.

It is the second largest earthen dam in India. The Kangsabati-Kumari Dam Reservoir Project was started in the year 1956-57.

Till date an irrigation potential of 3,48,477 ha. has been created in the districts of Bankura, Midnapore and Hooghly through this Project.The safety of the dams is very important aspect for safe guarding them, the number of dams have been build all over the India for development of water recourses for irrigation, water supply, power generation and other benefits.

The scope is based on a Geotechnical study was proposed to be carried out for understanding the sub-surface strata.

  • The main scope of work comprising of sinking 4 no. Boreholes up to maximum depth of about 41.25m.The bore holes were of 76mm in diameter. It included advancing the boreholes by Mud Rotary boring equipment.
  • The scope also included conducting Standard Penetration Tests, collecting disturbed samples at regular intervals for identification and logging purposes, collecting undisturbed tube samples at suitable intervals or at change of strata whichever is earlier and testing these in the laboratory and conducting field permeability test by falling head method at suitable intervals. Based on the above, this report presents the Bore Logs, Soil Profile, laboratory and field Test Results.