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In this section the technical information of the project is presented in form of the following items:
Body specifications
 
Item
Quantity
Dam type Double arc concrete
Height from foundation 315 m
Crest length 434 m
Crest width 10 m
Foundation width 50 m
Total concrete placement of the body 3.1 million m3

Specifications of sealing system

Sealing method Grouting curtain
Total length of grouting 58 km
Body specifications
Reservoir specifications
Item
Quantity
Total volume of reservoir 5200 million m3
Area of reservoir 58.7 km
Length of dam lake 59 km
Width of dam lake 1000 m
Normal level 830
Profitable volume of reservoir 3027 million m3
Reservoir specifications
Diversion system
 
First tunnel
Location Left abutment
Length of diversion tunnels 1151 m
Cross section Circular
Tunnel diameter after lining 12 m
Discharge capacity 2090 m3/s
Type of lining concrete
Second tunnel
Location Left abutment
Length of diversion tunnels 1180 m
Cross section U shape
Tunnel diameter after lining 13 m
Discharge capacity 1680 m3/s
Type of lining concrete
Type an height of upstream cofferdam RCC 51 m
Type an height of downstream cofferdam RCC 25 m
Diversion system
Instrumentation
No date exists in this regard.
Instrumentation
Spillway
Item
Quantity
Type of spillway Gated with tunnel
Location Right abutment
Type of gates Radial
Numbers of gates 2
Diameter of tunnel 11 m
Discharge capacity 5830 m3/s
Dimension of gates 17.7 by 11 m
 
Item
Quantity
Type of auxiliary spillway Orifice
Location  Dam body
Type of gates Radial
Numbers of gates 2
Diameter of tunnel 11 m
Discharge capacity 1510 m3/s
Dimension of gates 6.5 by 3.5 m

 

 

Spillway
Quarries and their specifications
Totally around 3 500 000 m3 of sand material is needed for the project. In order to find the suitable quarry, it became evident that within the radius of 40 km around the dam location, no river quarry exists. Therefore three areas were considered for this purpose.
 
A- Excavation materials within the area of dam body
     and power house:
The volume of excavation materials of dam foundation, spillways, power house will reach 2 700 000 m3, from which only 60 percent (equal to 1 600 000 m3) will be used for sand material.
 
B- QU1 and QU2 quarries:
These quarries are located within 2 km range of downstream of dam axis and the volume of their material reaches 3.5 million m3.
 
C- Upstream quarries:
This quarry is located in the area of fourth unit of Saruk Sazand (upstream of batching plant location). It has a good volume of 4 million m3 suitable material.
The results of short term chemical and physical tests is generally satisfactory and the reactions of available material are alkaline-solicit and alkaline-carbonate. Therefore long term tests are being carried out in this regard.
Quarries and their specifications
General specifications of powerhouse
 Item  Quantity
 Type of powerhouse  Underground
 Location  Left abutment
 Capacity  1500 mw
 Average annual generation  3000 million kw/h
 Turbine type  Francis with vertical axis
 Operation level  Minimum critical  770
 Normal  791
Maximum   830
General specifications of powerhouse
Specifications of powerhouse equipments
Item
Quantity
Numbers of turbine (main phase) 6 units
Numbers of turbine (development phase) Being designed
Power of each turbine 250 MW
Maximum output 92 %
Height of turbine design 250 m
Design discharge of each unit 104.5 m3/s
Numbers of generators (main phase) 6 units
Numbers of generators (development phase) Being designed
Type of generators Being designed
Output power of each generator 250 mva
Rotation speed of generator 272.7 rotations per minute
Specifications of powerhouse equipments
Specifications of powerhouse building

Powerhouse cavern
Length
Width
Height

161m

 24m

64m

Total volume of excavation

180 000 m3

Total volume of concrete placement

Being designed
 
Specifications of powerhouse building
Specifications of powerhouse outlet tunnels
In this regard no data exists.
Specifications of powerhouse outlet tunnels
Specifications of powerhouse waterways
In this regard no data exists.
Specifications of powerhouse waterways
Technical specifications of post and switchyard
Specifications of switchyard and 400 kv transfer lines
Post voltage 400 KV
Arrangement type of post 1.5 key
Numbers of  B Being designed
Intake numbers Being designed
Outlet numbers Being designed
Area of post land 50 000 m2
Specifications of 400 post
Numbers of transformers

Being designed

Numbers of feeders of transformers Being designed
Power of each transformer Being designed
Numbers of outlet feeders Being designed
Voltage of each outlet feeder Being designed
Technical specifications of post and switchyard
Specifications of tunnels
Main Phase
Length of water transfer tunnel 504 m
Diameter of intake transfer tunnel 8 m
Diameter of outlet transfer tunnel 9.5 m
Type of lining Concrete
Numbers of intake penstocks 6
Length of each penstock 51 m
Average diameters of penstocks 6.5 m

 

Development phase is being designed.

Specifications of tunnels
Intake structures
Item
Quantity
Numbers of intake 3
Maximum design discharge 104.5 m3/s
Design head 228.5-289.3 m
Numbers of  valves 2 series of 4
Type Stop-log
Valve of intake structure Radial
Width of valve Being designed
Height of valve Being designed
Intake structures
Outlet structures
Item
Quantity
Numbers of intake 6
Water filling level Being designed
Design head Being designed
Numbers of  valves Being designed
Type Being designed
Width of valve Being designed
Height of valve Being designed
Outlet structures
Access roads and bridges
A- Internal access roads

1-Technical specifications of internal access roads
 
Name of the road
Average width (m)
Length (km)
Downstream road

9

8

Access road to crest and site stabilization area

9

10

 
 
2- Technical specifications of internal bridges
 
Name of the bridge
Width (m)
Length (m)
Type of structure
Sezar 3 bridge

9

190

Metal sheet shaft with concrete
Dez bridge

9

150

Metal sheet shaft with concrete
Doab bridge

9

40

Metal sheet shaft with concrete
Sezar 2 bridge

7

100

Metal sheet shaft with concrete
The bridge adjacent to diversion tunnel

6

90

Roof-truss
Entrance bridge to GL6 tunnel

6

75

Roof-truss
 
B- External access roads

In order to have road access to construction location of Bakhtiari dam, Board of Managers of IWPC approved to construct an access road from Khorramabad city to Tangpanj station. The distance between Khorramabad and Tangpanj station is 112 km.
The width of the said road is 7 m and other details are being designed. This road includes the following components:
1- Khorramabad- Cheshmak with the length of 32 km, including the existing asphalt road
2- Cheshmak- Emamzade Seyed Ali with the length of 25 km, including the existing road which need asphalt lining
3- Emamzadeh Seyed Ali- Tanghaft with the length of 35 km, 20 km of which is rehabilitation of the existing road and the rest should be constructed
4- Tanghaft- Tangpanj with the length of 20 km, that should be constructed
Access roads and bridges
Complementary operations
In this regard no data exists.
Complementary operations

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