Mangdechhu Hydroelectric Project

The project comprises a 101.5 m high concrete gravity dam from the deepest foundation level, two intake tunnels of 196 m and 150 m in length, and a 13.54 km long headrace tunnel capable of discharging 118 m3 of water per second. The 152 m high surge shaft has a diameter of 13.5 m.

Encardio-rite was awarded the contract for monitoring the dam, powerhouse, intake, desilting chamber, surge shaft, pressure shafts, and adits. Turnkey services included the supply and installation of geotechnical instrumentation and manual and automatic monitoring.

Instruments used included a piezometer, strain gages, borehole extensometers, load cells, joint meters, temperature meters, plumb lines, seepage measurements, surface settlement markers, portable readout units, an automatic data acquisition system, and seismographs. A web data management system was also provided for the client to present monitoring data online.