Base Information

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.

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.

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.

Flood

Quantity of flood with different return periods at dam location is estimated from relation of average flood.

Return period (Year)	2	5	10	20	50	100	200
Discharge (m3/s)	185	325	434	552	719	855	100

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.

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 ?????? 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.

Planning the water resources

Normal levels	1756
Minimum levels of operation	1721
Reservoir volume similar to normal levels	228.3
Reservoir volume similar to minimum levels of operation	103.7
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	434.5 m
Minimum head	414 m
Maximum head	440 m
Design discharge of each unit	58.8 cubic meters per second

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.

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.

Dam reservoir

Water normal level	1756
Volume of reservoir	228 million cubic meters
Length of lake	20 km
Useful volume	124.6 million cubic meters
Bedrock	Dolomite lime (Dalan formation)

Rudbar Lorestan Project