Technical Information

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

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

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

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.

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

Quarries and their specifications

In this regard no data exists.

General specifications of powerhouse

Item	Quantity
Type of powerhouse	Surface
Capacity	480 MW
Average annual generation	843 GWh
Turbine type	Francis with vertical axis

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 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 outlet tunnels

Item	Quantity
Length of concrete lining	60 m
Length of rock lining	160 m
Width of canal	60 m

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

Technical specifications of post and switchyard

No data exists in this regard.

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

Intake structures

No data exists in this regard.

Outlet structures

No data exists in this regard.

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.

Complementary operations

In this regard no data exists.

Seimare Project