Project Information

  • Location: Kerala, India

Idukki Dam

Idukki Dam is a concrete, double curvature parabolic, thin arch dam constructed across the Periyar River between two granite hills known as Kuravan and Kurathi in Kerala, India. Completed in 1973, it is one of the highest arc dams in Asia, with a height of 168.91 m. The width of the dam is 7.62 m at the top and 19.81 m at the bottom. Encardio-Rite was awarded the complete contract for Real Time Early Warning Structure Health Monitoring & Data Interpretation (RESHMI).

Problem

To implement corrective measures, timely detection of any unforeseen behaviour was necessary. It was essential to gauge the impact of any natural event and generate data related to the dam's performance in a real-world situation. The installation of the prism target on the concave side of the double arch dam was quite challenging as it was difficult to reach the installation location due to the double curvature-parabolic surface of the intrados of the dam.

Solution offered

A trained person, with a license to work at heights, did the prism target installations. A rope access technician, at the dam top, controlled/assisted the movement of the installation person. During the installation, an experienced surveyor was always at the robotic total station to ensure the correct direction of the prism target. The successful installation of all the prism targets was quite an achievement.

Encardio-rite offered to supply and installation of geotechnical, geodetic and hydro-meteorological sensors, integration of existing working sensors, setting up data storage and backup servers, programming and commissioning of data loggers with wireless data transmission & robotic total stations with in-house developed control boxes and setting up Drishti software, our in-house data management software.

Compact data loggers and data acquisition systems collected the data from the sensors. Robotic total stations collected and transmitted data from prism targets at desired frequencies. All the data was transmitted to a central server in the control room. With the Drishti database management system, the data is accessible to all the stakeholders, in near real-time, with advanced alerts and warning systems.

An extensive training program was conducted successfully by the Encardio-rite experts regarding the geotechnical, geodetic, hydro-meteorological, seismic sensors and data acquisition systems installed at the site. An elaborate training was also provided on the Drishti database management system, data presentation, evaluation, interpretation etc.

Encardio-Rite supplied geotechnical instruments for monitoring including the uplift pressure meter, Crack meter, Tiltmeter, Concrete temperature meter, Water temperature meter, Flow meter, Water level sensor, Weather station, Dataloggers, Prism targets, earthing and lightning protection.

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