Nikachhu Hydropower Project

Nikachhu Hydropower Project

Nikachhu Hydropower Project

Nikachhu Hydropower Project is a run-of-the-river project located between the junction of Nikachhu/Chhunabchhu and Nikachhu/Mangdechhu in Trongsa District, Bhutan. It is located almost 3 km from Chhunabchhu junction downstream. 

Dam: 38 m high concrete gravity dam

Head Race Tunnel (HRT) : Diameter 4 m ; Length 12,144 m

PowerHouse: Design discharge hits two Pelton turbines with a capacity of 118 MW. The water is then discharged into the reservoir of Mangdechhu Hydropower Project

The complete instrumentation & monitoring work for the Dam, Power House, and Head race tunnel project was awarded to Encardio-rite. The scope of work included:

  • Supply of all instruments
  • Installation & monitoring of geotechnical instruments installed on surface & underground works 
  • Preparation of monitoring reports including data interpretation and analysis where required
  • Calibration, testing, and maintenance 

The instrumentation consisted of hundreds of geotechnical sensors including:

  • Piezometer
  • Uplift pressure cells
  • Automatic water level recorder
  • Digital Inclinometer
  • Load cell, center hole
  • Strain gage - rosette with no stress-strain gage
  • Concrete pressure cell
  • Shotcrete pressure cell
  • Joint meter – linear
  • Joint meter – tri-axial
  • Temperature meter
  • Borehole Extensometer (Multi-point)
  • Plumbline – normal and inverted
  • Bi-reflex target
  • Automatic data acquisition system
  • Automatic weather station
  • Strong motion accelerographs

An automatic Data Acquisition System was installed and commissioned to collected data from the above geotechnical instruments. The data was collected automatically at required intervals. 

Encardio-rite provided a comprehensive monthly monitoring report, combined for geotechnical and geodetic monitoring data on a weekly and monthly basis. Monitoring reports included interpretations of variations observed in instrument data with respect to the construction progress in the respective area.



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