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In this section the technical information of the project is presented in form of the following items:
Body specifications

Upstream Dam

Item
Quantity
Dam type Rock-fill with concrete lining (CFRD)
Height from foundation 82.5 m
Crest length 436 m
Crest width 12 m
Foundation width 280 m
Total volume of the body 1.55 million m3
Total volume of concrete placement 13506 million m3

Downstream Dam

 
Item
Quantity
Dam type Rock-fill with concrete lining (CFRD)
Height from foundation 102 m
Crest length 332 m
Crest width 12 m
Foundation width 360 m
Total volume of the body 2.3 million m3
Total volume of concrete placement 14057 million m3
Body specifications
Reservoir specifications

Upstream Dam

 
Item
Quantity
Total volume of reservoir 4344220 m3
Area of reservoir 141.105 km2
Length of dam lake 1000 m
Width of dam lake 400 m
Normal level +2406.5 m

Downstream Dam

Item
Quantity
Total volume of reservoir 6874709 m3
Area of reservoir 234.284 km2
Length of dam lake 1100 m
Width of dam lake 1000 m
Normal level +1905.4 m
Reservoir specifications
Diversion system

Upstream Dam

Item
Quantity
Item
Quantity
Location Right abutment Excavated diameter after lining 2.95 m
Numbers of diversion tunnels 1 Volume of open-cut excavation
Length of diversion tunnels 594 m Volume of underground excavation 3935 m3
Cross section Circular Discharge capacity 22.9 m3/s
Type of lining Concrete Type, height and volume of upstream cofferdam Rock-fill
5000 m3
Excavation diameter of tunnel 2.95 m Type, height and volume of downstream cofferdam 

Downstream Dam

Item
Quantity
Item
Quantity
Location Right abutment Excavated diameter after lining 4 m
Numbers of diversion tunnels 1 Volume of open-cut excavation
Length of diversion tunnels 707 m Volume of underground excavation 8792 m3
Cross section U shape Discharge capacity 32 m3/s
Type of lining Concrete Type, height and volume of upstream cofferdam Rock-fill
15000 m3
Excavation diameter of tunnel 4 m Type, height and volume of downstream cofferdam 
Diversion system
Instrumentation

Upstream Dam

 
Item
Quantity
Ross Arm Extensometer (UEX) Surface Displacement Point
(Full Structure) (USP)
Vertical joint Meter (UJM) Surface Displacement Point
(Concrete Structure) (UCS)
In Place Inclinometer (UIM) Vertical Inclinometer & Settlement Measurement (UISM)
Perimeter Joint Meter (UPM) Hydraulic Settlement Cell (UHS)
Total Pressure Cell (UEP) Electro Levels (UEL)
Electrical Piezometer (UPP)  

Downstream Dam

Item
Quantity
Ross Arm Extensometer (UEX) Surface Displacement Point
(Full Structure) (USP)
Vertical joint Meter (UJM) Surface Displacement Point
(Concrete Structure) (UCS)
In Place Inclinometer (UIM) Vertical Inclinometer & Settlement Measurement (UISM)
Perimeter Joint Meter (UPM) Hydraulic Settlement Cell (UHS)
Total Pressure Cell (UEP) Electro Levels (UEL)
Electrical Piezometer (UPP)  
Instrumentation
Spillway

Upstream Dam

 
Item
Quantity
Type of spillway Free staircase
Location Left abutment
Discharge capacity 203 m3/s
Length of chute 490.3 m
Width of chute 20 m

Downstream Dam

Item
Quantity
Type of spillway Free staircase
Location Left abutment
Discharge capacity 860 m3/s
Length of chute 198.25 m
Width of chute 30 m
Spillway
Quarries and their specifications

Upstream Dam


 Quarry
 Specifications
 Quantity
Quarry no.1 Volume of exploitable rock 1.981 million m3

Downstream Dam


 Quarry
 Specifications
 Quantity
Quarry no.2 Volume of exploitable rock 0.83 million m3
Quarry no.3 Volume of exploitable rock 1.8 million m3

Quarries and their specifications
General specifications of powerhouse
Item
Quantity
Type of powerhouse Underground Pump Storage
Capacity 1040 mw
Average annual generation
Turbine type Francis
General specifications of powerhouse
Specifications of powerhouse equipments
Item
Quantity
Numbers of turbine 4 units
Power of each turbine 260 mw
Maximum output 97 %
Height of turbine design 504 m
Discharge of each unit at manufacturing time 65 m3/s
Discharge of each unit at generation time 50 m3/s
Turbine manufacturer Foit Siemens Fuji
Numbers and capacity of main transformers 13 by 105 mva
Numbers and capacity of auxiliary transformers 3 by 10 mva
Transforming ratio of main transformers 18 kw/400 kv
Impedance of short circuit 12 to 14 %
Numbers and type of generators 4 units synchronic
Output power of each generator 260 mw
Nominal voltage of each generator 18 kv
Rotation speed of generator 500 rotations per second
Nominal voltage of generator 12500 Ampere
Generator manufacturer Siemens
Capacity of emergency generator 1.9 mw
Type of emergency turbine Diesel
Cooling system of transformers OFWF (ODWF)
Nominal frequency of transformer 50 hertz
Specifications of powerhouse equipments
Specifications of powerhouse building
1-Powerhouse cavern:

 
Length
Width
Height

131 m

34.5 m

46.5 m


 
2-Transformer cavern:

Length
Width
Height

160 m

13 m

22 m

 
3-Gates cavern:

Length
Width
Height

79 m

4.5 m

8 m

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
Item
Quantity
Item
Quantity
Type GIS Numbers of high voltage lines 3+1
Voltage level 400 kv Numbers of intake feeders of XPLE cable 4
Technical specifications of post and switchyard
Specifications of tunnels
Item
Quantity
Numbers 2
Cross section Circular
Diameter of each water transfer tunnel 5.7 m diameter of concrete cross section
5 m diameter of metal cross section
Excavation diameter 6.9 m
Length of left tunnel 2225 m to tank surge
Length of right tunnel 2185 m to tank surge
Lining type of left water transfer tunnel 2040 m concrete lining
185 m metal lining
Lining type of right water transfer tunnel 1985 m concrete lining
197 m metal lining
Water transfer capacity of each tunnel at turbine status 130 m3/s
Water transfer capacity of each tunnel at pumping status 100 m3/s
Diameter if leaning shafts 5 m
Length of each leaning shaft 540 m
Lining type of leaning shafts Metal
Diameter of outlet tunnel 6 m
Specifications of tunnels
Intake structures
Item
Numbers
Dimensions (m)
Weight (Ton)
Emergency intake gates
2 series
2 pieces
5.1 by 5.4 25
Fixing gates 1 series
3 pieces
5.2 by 5.4 17
Trash racks 2 series 10 by 14 34
Intake structures
Outlet structures
Item
Numbers
Dimensions (m)
Weight (Ton)
Emergency outlet gates (Bulkhead)
2 series 5.3 by 7.1 18.4
Trash racks 2 series 9.5 by 13.6 32
Outlet structures
Access roads and bridges
1- Technical specifications of access roads

Upstream Dam

 
Name of the road
Average width (m)
Length (km)
Access road from Chalus road to upstream dam 8 1499
Access road to bottom outlet from upstream dam crest 8.7 1171
Access road to surging tanks through upstream dam crest 10.5 3000
Access road to entrance of bottom outlet through upstream dam crest 11 878
Access road to intake gates chamber through upstream dam cerst
 

Downstream Dam

Name of the road
Average width (m)
Length (km)
Access road to Daryabak Complex from Chalus road 7 2365
Access road to dam crest from Daryabak road 10 380
Access road to area of GIS post
This road continues to admin building and then to entrance of main access tunnel
This road is the continuation of access road to dam crest
7.9 750
Connection road between the downstream and upstream dams This road passes near the entrance of main access tunnel and ends to the access road to surging tank of upstream dam 7 4030
Access road to AGC 7 1000
Access road to NAG 7 1800
Access road to middle access gallery to pressure shafts (Intermediate Adit) 1 1700
Access road to surging tanks 7 4030
Access road to substitute chamber in waterways 7 520
Access roads to consultant and client offices 7 550
Access road to contractor office (Joint B) 7 1200
Access road to entrance of bottom outlet through downstream dam crest 6 500
Access road to exit of bottom outlet through downstream dam crest
 
 
2- Technical specifications of the bridges
 
Name of the bridge
Width (m)
Length (m)
Type of structure
The bridge on chute of upstream dam 7.5 21.6 Metal with concrete lining (Composite)
The bridge on chute of downstream dam 6.2 31.5 Metal with concrete lining (Composite)
The bridge on Garmrudbar river 8 62 Metal with concrete lining (Composite)
Access roads and bridges
Complementary operations
In this regard no data exists.
Complementary operations

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