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Profile of Arun III

30/05/1995

LOCATION

On the Arun river in Sankhuwasabha district,about 200 km east of Kathmandu

TOTAL POTENTIAL OF THE ARUN BASIN
1,045 mw
PRE-FEASIBlLITY STUDY
March 1985
FEASIBILITY STUDY
June 1987
DETAILED ENGINEERING STUDY
December 1992
TARGET COMMISSIONING DATE
April 1, 2001
TOTAL POWER GENERATION
201 mw (Phase I), 201 mw (Phase II)
TOTAL ESTIMATED COST

US $1.2 billion. of which the 1st phasewill account for US $760 million

OTHER COMPONENTS

117 km access road to the project432 km long 220 kv transmission line to wheel thepower into the national grid at Duhabi in the 1st stage(120 km), and from Duhabi to Kathmandu via Dhalkebarin the 2nd stage (312 km)



Technical profile

FIRM FLOW OF THE ARUN RIVER
75 cubic metre/second
MAXIMUM GROSS HEAD
304 metres
CONCRETE GRAVITY DAM
68 m high and 165 m long
SPILLWAY

Discharge capacity of 8,100 cusec3 radial gates, each with upstream stoplogs2 of the gates equipped with flap gates to control water

HEADRACE SYSTEM

2 head race tunnels, 11.4 km long and 5.6 m in finisheddiameter 2 surge tanks, 95 m high and 15.9 m in diameter

DESANDING BASINS
stage 1- 2 basins (110 m x 17 m x 28 m) Stage 11- 2 basins
TURBINES
3 x 67 mw for each phase
POWER CAVERN

168.24 m x 22 m x 35.25 m to house 6 generating units,and service and unloading bays

TRANSFORMER CAVERN
213.9 m x 10 m x 10 m

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