Technical Information

Body specifications

Item	Quantity
Dam type	Rock-fill with clay core
Height from foundation	180 m
Crest length	760 m
Crest width	15 m
Foundation width	1075 m
Total volume of the body	28.5 million m3
Sealing grouting width	450 000 m
Area of sealing wall	42 000 m2
Foundation grouting width	250 000 m
Grouting and access gallery length	3750 m
Volume of soil and cement	500 000 m3

Reservoir specifications

Item	Quantity
Total volume of reservoir	4.5 billion m3
Area of reservoir	96.5 km2 at +234 masl
Length of dam lake	90 km at +234 masl
Width of dam lake	1.1 km
Normal level	230 masl

Diversion system

Item	Quantity
Location	Left bank of the river
Numbers of diversion tunnels	2
Length of diversion tunnels	Right: 1453 m Center: 1514 m Left: 1563 m
Tunnel diameter after lining	9.5 m
Open-cut excavation volume	2.2 million m3
Underground excavation volume	550 000 m3
Cross section	U shape
Type of lining	Reinforced concrete
Tunnel excavation diameter	11 m
Discharge capacity	4200 m3/s
Type, height and volume of upstream cofferdam	Rock-fill with clay core, 82 m and 3.5 million m3
Type, height and volume of upstream cofferdam	Rock-fill with clay core, 23.5 m and 400 000 m3

Instrumentation

Dam body instrumentation

Piezometer in foundation	Hydraulic piezometer of body
Pore water pressure cell of foundation
Pore water pressure cell of dam body

Spillway

Item	Quantity
Type of spillway	OG gated with water chute
Location	Left bank
Type of gates	Radial
Numbers of gates	4
OG level	+218
Width of spillway	72 m
Discharge capacity	17500 m3/s
Diameter of gates	15 by 17 m
Concrete placement volume	700 000 m3
Excavation volume	19 million m3

Quarries and their specifications

Type of material	Location of quarry
Fine-graded material	Emamzade Zeid quarry with the distance of 8 km from the site
Drainage material	Beneheydar quarry with the distance of 11 km from the site
Fin-graded filter material	Kohang quarry with the distance of 57 km from the site
Concrete material	Beneheydar, Kohang and Andimeshk quarries
Rip-rap material	Manghati and Chenare quarries both with the distance of 110 km from the site

General specifications of powerhouse

Item	Quantity
Type of powerhouse	Surface
Capacity	1000+1000 mw
Average annual generation	4500 GWh
Turbine type	Francis with vertical axis

Specifications of powerhouse equipments

Item	Quantity
Numbers of turbine	4+4
Power of each turbine	254 MW
Output in nominal condition	94.4 %
Height of turbine design	141 m
Discharge of turbine in nominal condition	193 m3/s
Turbine manufacturer	Voith of Austria Azarab Arak
Numbers of transformers	12+1 (spare) for 4 units 24 for 8 units
Nominal power of each transformer	100 MVA
Nominal second voltage of transformer	400 KV
Numbers and type of generators	4+4 vertical synchronic
Output power of each generator	278 MVA
Nominal voltage of each generator	15.75 KV
Rotation speed of generator	187.5 rotations/minute
Nominal current of generator	10191 A
Generator manufacturer	Elin of Austria Pars Generator
Transformer type	OFWF
Basic nominal voltage	15.75 KV
Cooling system	water

Specifications of powerhouse building

General specifications of building:

(considering development plan)

Length of the building	Width of the building	Height of the building
200m	50m	70m

Item

Quantity

Excavation 3 million m3

Reinforcement 22 000 tons

Structural and filling concrete placement 300 000 m3

Heavy metal works 1300 ton

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

Type

AIS

Voltage level 400 KV

Numbers of high voltage lines 4+2 (development phase)

Input feeders 4

Specifications of tunnels

Water transfer tunnels

Item	Quantity
Length of water transfer tunnel	1400 m
Diameter of intake transfer tunnel	11 m
Type of lining	900 m concrete 500 m steel
Numbers of penstocks	2 series for first phase 4 series for second phase
Length of each penstock	500 m
Average diameters of penstocks	7 m
Numbers of surging tanks	2 series for first phase 2 series for second phase

Depth outlet

Item

Quantity

Ceiling crane 40 tons

Emergency gate (equipped with hydraulic motor) 1 set

Dimension of gates 3 by 4 m

Service gate (equipped with hydraulic motor) 1 set

Dimension of gates 3 by 4 m

Metal lining 1 set

Weight of metal lining 900 tons

Intake structures

Hydro mechanical specifications of intake structure

Item	Quantity
Numbers of intake	4
Width	11 m
Height	26 m
Water filling level	154
Maximum design discharge	900 m3/s
Design head	90 m
Gate crane	150 tons
Course of gate crane	100 m
Numbers of stop log gates	1 set
Width of the gate	7 m
Height of the gate	12 m
Minimum operation level	190 m
Trash rack type	Fixed
Course of trash rack system	7 m
Numbers of wheeled gates	4 sets

Outlet structures

Item

Quantity

Gate crane 30 tons

Stop log gate 2 sets

Dimension of gates 9 by 6 m

Access roads and bridges

1- Technical specifications of access roads

Name of the road	Average width (m)	Length (km)
Substitute road of submerged area and Lali-Masjedsoleiman	9	20 000
Access road to chute	9	9000
Access road to dam crest from left bank	11	5000
Access road from regulating dam to construction site	9	10 000

Technical specifications of the bridges

Name of the bridge	Width (m)	Length (m)	Type of structure
Lali big bridge	14.5	480
Gotvand city bridge	11.5	260
Permanent bridge of the site	13	150

2- Technical specifications of access tunnels

Name of the tunnel	Width (m)	Length (m)	Height (m)
Emamzade Zeid tunnel	10	700	7
Access tunnel to spillway excavations	10	360	7
Access tunnel to water transfer tunnels	10	970	7
Access tunnels to grouting galleries	6	4000	5

Complementary operations

Lateral buildings:
Construction activities of the client’s office and the residential building of equipment contractor are finished and they are handed over temporarily. Sport complex, supervisors and client’s residential building and VIP is in finishing stage. Parallel to that the civil works of the main site and the structure of feasibility building are about to be finished. In the mean time sewerage system of Emamzade Zeid complex is being installed and all of the buildings of equipment contractors are handed over to Engineering Affairs Dept.

Gotvand Project