Technical Information

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

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

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

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)

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

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

General specifications of powerhouse

Item	Quantity
Type of powerhouse	Underground Pump Storage
Capacity	1040 mw
Average annual generation
Turbine type	Francis

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 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 outlet tunnels

In this regard no data exists.

Specifications of powerhouse waterways

In this regard no data exists.

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

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

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

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

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)

Complementary operations

In this regard no data exists.

Siahbishe Project