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In this section the project basic information is presented in form of following items:
Topography
Rudbar Lorestan Dam is situated on Rudbar River( one of the main branches of east Dez River) 100 km south of Aligoodarz city in Lorestan Province and within the territory of Zagros chain of mountains in west of Iran. This region has a highly rough and tectonic topography.
 
Catchment Area
Average elevation of Catchment
Max Elevation
General slope of catchment Area
2255 KM2
2537 masl
2500 masl
7.27%
Topography
Meteorology
Existence of high mountainous bulkheads south of Rudbar catchment area has caused a topographic situation so that currents of humid air masses create a special climate for this region by clashing with high mountains and deep valleys as the result of which these masses lose their humidity with precipitations from west and south to north and precipitations at north of catchment are reduced as of height increases. Rain gage stations of Zard Fahreh and Hargan in Kazem Abad that were constructed by Ab Niroo Company in 1383 at site location are being operated. These stations are operated periodically by Regional Water Organization and the company operates Ab Niroo station since three years ago.
 

Monthly rainfall on Catchment (mm)

Jan
Feb
Mar
Apr
May
Jun
July
Aug
Sep
Oct
Nov
Dec
48.4
100.4
60.2
70
60.9
0.5
0.1
0
4.9
0
71
92.7
 

Monthly Average Temperature at site (Cº)

Jan
Feb
Mar
Apr
May
Jun
July
Aug
Sep
Oct
Nov
Dec
1.5
2.1
6.1
11.6
17.2
22.6
26.2
26.5
23
17.4
11.1
5.3
 

Reservoir Monthly evaporation (mm)

Jan
Feb
Mar
Apr
May
Jun
July
Aug
Sep
Oct
Nov
Dec
26.5
26.5
55
107
165.9
244.5
243.1
246.1
217.1
174.2
114.2
58.8
Meteorology
Hydrology
Ab Rudbar River is one of the main branches of east branch of Dez or Bakhtiari River. Main branches of this river include Ghalian river (that is formed by merger of Dareh Dozdan, Dai and Dareh Elko main branchs), Kakolestan River and Vahregan River. This river circles around a chain of U- shape heights with the length of 38 meters on its way and changes its name to Alken River. Area of catchment area up to dam location is 2255 square meters and yearly current of river at dam site is equal to 30.2 cubic meters per second.
Hydrology
Flood
Quantity of flood with different return periods at dam location is estimated from relation of average flood.
 
 
Return period (Year)
2
5
50
100
1000
10000
PMF

Discharge (m3/s)

435

720
1440
1630
2050
2500
3500
Flood
Water quality
Results of water quality in Rudbar axis are not available but quality of water in the closest station to axis is suitable for agricultural consumption and is classified as good for drinking purposes.
Water quality
Sedimentation
Sedimentation load at location of Rudbar Dam is equal to 874785 tons per year and its special sedimentation has been estimated to be 1105.7 tons per square kilometer per year.
In connection with sedimentation issues some studies were carried out about Sediment flashing operations and manner of discharge of sediment from lower discharger but this issue was not continued due to risk of demolition of concrete and unknown matters.
Sedimentation
Planning the water resources
Normal levels
1756

Minimum levels of operation

1721

Reservoir volume similar to normal levels
228
Reservoir volume similar to minimum levels of operation
104
Installation capacity
450 Mega Watt
Number of units
2
Total energy
986 Giga Watt per hour per year
Average inlet current
975.3 million cubic meters
Overflow
32.1 million cubic meters per year
Design head
430.74 m
Minimum head
401.74 m
Maximum head
436.74 m
Design discharge of each unit
57.8 cubic meters per second
Planning the water resources
Geology
Valley of dam location is a narrow valley with sharp sloppy walls made of dolomite limes of Dalan formation (Perminpecin). It seems that these limes form the carbonate section of upper Dalan formation. We witness younger formations towards the bottom of outcrop such as Grow and Serook towards upstream and inside the reservoir of formation of outcrop corridor- larger section of project scope( 100 km radius around central point) in Zagros tectonic unit and smaller section of project scope( north and northeast) are situated in Sanandaj ring.
Geology
Seismicity
Building site of Rudbar Dam and power plant is situated in Zagros folded-driven ring. The closest active and seismogenic formation is Saravand- Boznavid fault (Ghalikooh fault) that is part of main young fault of Zagros. This fault is also called Bakhtiari and Ghalikooh fault as well. The most important formation in dam site is F1 fault. This fault crosses the dam axis and has been identified by fault mirror in the axis territory, inclination of fault plate is 90 degrees and level of its displacement is 6 meters. This fault is a right slip fault.
Important faults:
1- Saravand-Boznavid (Ghalikooh) fault
2- Eslam Abad fault
3- F1 fault
Silafor earthquake (January 1909) with 7.4 Richter scale has been reported 76 km from dam site.
Seismicity
Dam reservoir
Rudbar Lorestan Dam and Hydropower Plant Project (HPP) is located on Rudbar River   (in upper East of Dez River catchment area) in Zagros Mountain, and nearly 100 kilometers distance from South of Aligoodarz City in Lorestan Province.
 

Volume of reservoir

228 million cubic meters

Useful volume
115 million cubic meters

Water minimum level

1721

Water maximum level

1764

Bedrock
Dolomite lime (Dalan formation)
Dam reservoir

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