120 MW Rammam Hydroelectric Power Project, Stage III

120 MW Rammam Hydroelectric Power Project, Stage III

120 MW Rammam Hydroelectric Power Project, Stage III

The location of the project is approximately 150 km from Bagdogra / Siliguri in the Darjeeling district. The location of the dam is 3 km upstream of Lodhama, West Bengal. Rammam project is a run-of-the-river type of hydroelectric power project. The head & discharge of the project is 481.33 & 28 cumsec. The length of the D-shaped headrace tunnel is 8.2 km & dia. is 4 m. The surge shaft is a restricted orifice type with a dia. of 14.5 m & a height of 52.5 m. The length of the pressure shaft/penstock is 1520 m with a dia. of 2 .5 m. The tailrace tunnel is cut & cover box section type with size (4×3 m) & its length is 740 m long. The output capacity of the project is 120 MW i.e (40×3 ).

Encardio-rite was awarded the sub-contract for supply, installation as well as monitoring of geotechnical instrumentation for the Barrage and headrace tunnel. The instrumentation included:

  • Piezometers
  • Pressure cells
  • Strain meters – rosette with no stress strain meter
  • Inclinometers
  • Joint meters
  • Borehole extensometer – multipoint 
  • Automatic water level recorder
  • Portable readout units
  • Dataloggers
  • Strong motion accelerometer 

 

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