Table 1: The Krahnjkar hydro scheme in figures
Installed capacity |
690MW |
Generating capacity |
Approx. 4,600GWh/year |
Turbines |
Francis, vertical axis |
– Number |
6 |
– Rated discharge per unit |
24m3/sec |
– Rated output per unit |
115MW |
Total head |
599m |
Rated discharge (maximum discharge) |
144m3/sec |
Average discharge |
110m3/sec |
Hlsln reservoir |
|
– Area of full reservoir |
57km2 |
– Length of reservoir |
25km |
– Live storage |
2,100Mm3 |
– Reservoir full supply level (FSL) |
625m asl |
– Reservoir minimum operating level (MOL) |
575m asl |
– Hlsln reservoir catchment area |
1806km2 |
– Average inflow to Hlsln reservoir |
107m3/sec |
|
|
Krahnjkastfla dam |
|
– Maximum dam height |
193m |
– Dam length |
730m |
– Fill materials |
8.5Mm3 |
|
|
Desjarrstfla dam |
|
– Maximum dam height |
60m |
– Dam length |
1100m |
– Fill materials |
2.8Mm3 |
|
|
Sau_rdalsstfla dam |
|
– Maximum dam height |
25m |
– Dam length |
1.100m |
– Fill materials |
1.5Mm3 |
|
|
Ufsarln pond |
|
– Area of full reservoir |
1km2 |
– Maximum water level |
625m asl. |
– Ufsarln pond catchment area |
430km2 |
– Average inflow to Ufsarln pond |
31m3/sec |
|
|
Ufsarstfla dam |
|
-Maximum dam height |
37m |
– Dam length |
620m |
– Fill materials |
0.6Mm3 |
|
|
Keldurln reservoir |
|
– Area of full reservoir |
7.5km2 |
– Reservoir full supply level (FSL) |
669m asl |
– Live storage |
60Mm3 |
|
|
Keldurstfla dam |
|
– Maximum dam height |
26m |
– Dam length |
1,650m |
– Fill materials |
0.8Mm3 |
|
|
Tunnels |
Approx. 72km |
Headrace from Hlsln (dia: 7.2-7.6 m) |
39.7km |
Headrace from Ufsarln (dia: 6.5 m) |
13.3km |
3 adits to headrace (dia: 7.2-7.6 m) |
6.9km |
2 diversion tunnels and adit at dam |
2,4km |
Grouting galleries at dam |
0.5km |
Surge tunnel (dia: 4.5 m) |
1.7km |
2 diversion tunnels Hraunaveita (dia: 4.5 m) |
3.7km |
2 vertical pressure tunnels (dia: 4.0 m) |
0.8km |
Access tunnel to power station (dia: 7.5 m) |
1km |
Tailrace tunnel (dia: 9.0 m) |
1.3km |
Cable tunnel (dia: 4.0 m) |
1km |
Source: Landsvirkjun