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In this section the project basic information is presented in form of following items:
Topography
River length is more than 300 km and Bakhtiari dam has a catchment area of 6388 km2.
 
Item
Quantity
Catchment area 6388 km2
Average height of catchment area 2212m
Catchment area slope 35%
Average slope of the river 5.65%
Length of main river 300 km
 
Topography
Meteorology
 
Item
Quantity
Average annual rainfall in catchment area 1117 mm
Average evaporation of reservoir 1780 mm
Average annual temperature of dam construction site 21.2 °C
Probable maximum rainfall (PMP) 144 mm
 
Within the catchment area there are 5 meteorology stations, which although they do not have similar outputs, but generally their situation are estimated to be desirable.
Meteorology
Hydrology
The studied regional stations include Taleh Zang Dez, Tangpanj Sezar, Tangpanj Bakhtiari, Sepid Dasht Sezar, Zaz, Zard Fahrah, Ghelyan and Kazem Abad Kakolestan.
 
Item
Quantity
Catchment area 6388 km2
Concentration time 35 h
Average slope of the river 35%
Average outflow of water in Tangpanj station 144.6 m3
 
Hydrology
Flood
According to the existing data achieved from floods, most of the floods have taken place in spring and fall. The biggest observed flood in Bakhtiari River had a discharge of 4988 m3/s and occurred in Azar of 1994. Estimated discharge of floods with several return periods is presented in the following table:
 
 
Return Period
5
25
100
1000
10000
Peak discharge (m3/s) 2489 3910 5043 6857 8641
Flood
Water quality
Quality of Bakhtiari River water with ER and TDS are orderly 1090 maximum and 376 for drinking and agricultural use.
Water quality
Sedimentation
Annual sediments volume of the area is estimated about 9 million m3.
Sedimentation
Planning the water resources
 
Item
Quantity
Unit
Normal figures
830
masl
Minimum figures
785
masl
Reservoir minimum volume
2722
mmm
Reservoir volume at normal figures 5200 mmm
Reservoir profitable volume 2122 mmm
Annual inlet volume 4307 mmm
Water regulation volume 3688 mmm
Safety functional coefficient 21 %
Power house installation capacity 1500 Mw
Primarily annual energy 2368 GWH
Secondary annual energy 617 GWH
Output 92 %
Planning the water resources
Geology
The project location is wrinkled at north-west of Zagros sedimentary catchment area and is situated in Dezful low lands. This structure is situated mostly on Silica-lime of serok Sazand. Some of the important geological structures of the area are Gir Yoveh & Sia Klooh anticline, F1, F2 and F3 faults and kink bands. The penetration amount in left side is somehow high. Seismic topography tests results shows average velocity of 3200 to 2700 m/s in abutment and 500 m/s at foundation, which are not due to stone mass quality. Underground and galleries explorations and grouting tests are being carried out. 
The soil mechanic tests for determining the module of shape alternation and other physical specifications of stone mass are also being carried out.
Geology
Seismicity
Bakhtiari dam seismocity parameters are studied regarding seismography data of the region and general behavior of Zagros. With use of Deterministic method and Probabilistic method, the maximum amount of land horizontal velocity for
50-year return period (CE) is 0.15g, 145-year return period (OBE) is 0.23 g, 475-year return period (DBE) is 0.32 g and for 2000-year return period (MDE) is 0.45g. Maximum acceptable earthquake (MDE) for F3 fault is equal to 0.55 g which is equal to the vertical velocity of 0.429.
Seismicity
Dam reservoir
 
Item
Quantity
Total volume of reservoir 5200 million m3
Profitable volume of reservoir 3027 million m3
Water normal level 830 masl
Water minimum level 782.2 masl
Water maximum level 840 masl
 
Dam construction area is generally located on silica-lime Sazand of the Serok and according to the layers thickness and silica compounds, is divided into seven sub-units of Sv1 to Sv7. Some of the important geological structures are anticline of Giriveh and Siahkooh, F1-F3 trust, younger fault of F2, kink bands, forked clines and four joint systems at construction site. Slope and direction of layering slope, generally at downstream of anticline axis is N215/75 and in its upstream is N035/50. The issue of studying slope stability in current situation, without considering the artificial off-take of materials in axis area and other structures, does not show any difficulty and the abutments are stable in case of earthquake.
Dam reservoir

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