Table 2

1 January 2000

Table 2: Civil works (arch dam, underground powerhouse etc.) – Lot 1B/2/3

Arch dam - Features	Dimension/Quantity	Unit
Height	188	m
Crest length	420	m
Crest elevation	1,145	m
Maximum thickness at base	28	m
Thickness at crest	5.6	m
Low level outlet radial gates – 4 No. at el. 1,057m	8.0 x 5.6	m
Open excavation	310,700	m3
Underground excavation	14,800	m3
Concrete (mass and structural)	1,034,000	m3
Unit Cost of Concrete (incl. cement, not forms)	$100.24	USD
Reinforcing steel	7,000	tonnes
Embedded cooling pipes	204,000	m
Concrete placement period	36	months
Maximum concrete placement rate	46,800	m3/month
Average concrete placement rate	28,700	m3/month
Cement Content (Dam mix including pozolans)	240	kg/ m3
Average dam concrete strength (150mm maximum aggregate mix - 97% std. dev.)	30.2	Mpa
Power Complex - Features	Dimension/Quantity	Unit
Intake structure height	75	m
Upper headrace tunnel, 7.25m lined diameter	320	m
Vertical shaft, 6.75m lined diameter	120	m
Lower tunnel 6.75m reducing to 4 - 4.0m steel lined penstocks	408	m
Powerhouse cavern	95lg x 18w x 38h	m
Tailrace tunnels, 4 No. x 5m diameter x 73m long	292	m
Francis Turbines	4	ea
Plant Maximum Flow	220	m3/sec
Unit Design Head	155	m
River Diversion Works - Features	Dimension/Quantity	Unit
Diversion Tunnel No.1 – invert lined, dia. 7.8m	430	m
Diversion Tunnel No.2 – fully lined, diameter 7.0m	370	m
Upstream cofferdam – Mass concrete
Crest length	75	m
Top elevation	978.5	m
Height	18.5	m
Concrete Volume	10,443	m3
Tunnel No. 2- Duel High Pressure Bonneted Slide gates	2.54w x 2.67h	m

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