Table 4

1 January 2000

Table 4: Samanalawewa Hydroelectric Project Main Characteristics

Dam
Type	Rock Fill Earth Core
Height	100m
Length	530m
Volume of fill	4.5Mm3
Reservoir
Catchment Area	341.7Km2
Annual Average runoff	598Mm3
Normal High Water Level	EL 460m
High Flood Level	EL 460.7m
Minimum Operation Level	EL 424m
Live Storage Capacity	218Mm3
Spillway
Type	Gated overflow chute
Design Discharge	3600m3/sec (10,000 year flood)
Number of gates	03 Nos.
Dimensions	12m wide, 14m high
Spillway Ogee Level	EL 446.7m
Diversion Tunnels
Number of Diversion Tunnels	02 Nos.
Diameter	6.8m
Length	550m
Designed Capacity	145m3/sec (100 year flood)
Low Level Outlets
Emergency Release Gate	2.0m x 2.0m Jet Flow Gate
Irrigation Release Gate	0.6m dia. Pipe with Howel Bunger Valve
Head Race Tunnel
Diameter	4.5m (concrete lined dia.)
Length	5350m
Surge Chamber
Type	Restricted Orifice Type
Diameter of Riser	6.0m
Diameter of Chamber	18.0m
Height	94 m
Penstock
Type	Steel Surface
Diameter	3.85m to 2.85m
Length	840m
Power Station
Type	Surface
Number of Units	02
Installed Capacity	120MW (2 x 60 MW)
Average Annual Energy	403GWh
Turbine
Turbine Type	Francis
Turbine - Rated Head	320m
Rated Discharge	42m3/sec
Speed	500rpm
Rated Output	62MW
Generator
Rated Output	71.6MVA
Power factor	0.85
Generated Voltage	10.5kV
Fly wheel effect (GD2)	715tm2
Tailrace
Type	Open Cannel
Length	585m
Power Transmission
Transformers	02 Nos., 75 MVA, 3 phase
Transmission Line	132kV double circuit 17km to Balangoda

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