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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 180 m
Crest length 202 m
Crest width 6 m
Foundation width 28 m
Total volume of the body Approx. 550 000 m3
Total volume of concrete placement Approx. 650 000 m3
Body specifications
Reservoir specifications
Item
Quantity
Total volume of reservoir 3200 million m3
Area of reservoir 69.5 km2
Length of dam lake 40 km
Width of dam lake 202 m
Normal level 720 masl
Reservoir specifications
Diversion system
Item
Quantity
Numbers of diversion tunnels 2
Cross section

Tunnel no.1: circular

Tunnel no. 2: U shape

Length of diversion tunnels

Tunnel no.1: 473 m

Tunnel no. 2: 397 m

Type of lining Concrete
Tunnel diameter after lining

Tunnel no.1: 10.5 m

Tunnel no. 2: 8.3 m

Open-cut excavation volume

Tunnel no.1:

Tunnel no. 2:

Underground excavation volume 230 000 m3
Cross section 87 200 m3
Type, height and volume of upstream cofferdam Rock-fill with clay core, 575 700 m3 volume, 10 m width and 24 m height
Type, height and volume of upstream cofferdam Rock-fill with clay core, 54 600 m3 volume, 5 m width and 12 m height
Diversion system
Instrumentation
Totally 632 instrumentation device is used including direct and upside- down pendulums,  joint meter, three dimension joint meter, thermometer, inclinometer, extensometer, piezometer and 360 thermocouple for measuring temperature during construction period.
Instrumentation
Spillway
Item
Main spillway
Auxiliary spillway
Type of spillway Gated Free
Type of gates Radial
Numbers of gates 2 4
Dimensions of gates 11 by 15.5 m
Discharge capacity 5763 m3/s 2467 m3/s
Spillway
Quarries and their specifications
In this regard no data exists.
Quarries and their specifications
General specifications of powerhouse
Item
Quantity
Type of powerhouse Surface
Capacity 480 MW
Average annual generation 843 GWh
Turbine type Francis with vertical axis
General specifications of powerhouse
Specifications of powerhouse equipments
Item
Quantity
Numbers of turbine 3 units
Power of each turbine 163.3 MW
Maximum output 94.5 %
Height of turbine design 114 m
Discharge of turbine in max. load condition 156 m3/s
Generator manufacturer Alstom
Numbers of transformers

12+1 (spare) for 4 units


24 for 8 units

Output power of each generator 178 MW
Nominal voltage of each generator 13.8 KV
Rotation speed of generator 187.5 rotations/minute
Nominal current of generator 7447 A
Turbine manufacturer Alstom
Specifications of powerhouse equipments
Specifications of powerhouse building
General specifications of building:

Length of the building
Width of the building
Height of the building
95 m 47.5 m 51.5 m
 
Specifications of powerhouse building
Specifications of powerhouse outlet tunnels
Item
Quantity
Length of concrete lining
60 m
Length of rock lining 160 m
Width of canal 60 m
 
Specifications of powerhouse outlet tunnels
Specifications of powerhouse waterways
Item
Quantity
Length
1476 m
Diameter 11 m
Type of lining Concrete and metal
Numbers of penstock 3
Length of each penstock 170 m
Average diameter of penstocks 5.7 m
Specifications of powerhouse waterways
Technical specifications of post and switchyard
No data exists in this regard.
Technical specifications of post and switchyard
Specifications of tunnels
Length of water transfer tunnel
1476 m
Diameter of water transfer tunnel 11 m
Type of lining Concrete and metal
Numbers of penstocks 3
Length of each penstock 170 m
Average diameters of penstocks 5.7 m
Specifications of tunnels
Intake structures
No data exists in this regard.
Intake structures
Outlet structures
No data exists in this regard.
Outlet structures
Access roads and bridges
1- Technical specifications of access roads
 
Access roads of this project have been constructed with mixed river materials, after excavation and embankment with proper compaction percentage and 20-cm of sub-base layer. It should be noted that the width of these roads is averagely 8 m.
 
2- Technical specifications of the bridges
 
Totally 17 bridges have been constructed in this project. These bridges are constructed according to specifications mentioned in annual journal of Management Organization (2002 issue), mostly with width of 1 m, rock walls of both sides and often with cement pipes with 1 m diameter. Foundations of all bridges are concrete and their maximum and minimum heights are 3 and 1 meter. In the mean time an arc bridge is constructed in the route of access road to dam body.
Access roads and bridges
Complementary operations
In this regard no data exists.
Complementary operations

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