Hirakud Dam across the river Mahanadi was constructed for flood control, irrigation
and power generation. Hirakud Dam is a composite structure of earth, concrete
and masonary. The Main dam having an overall length of 4.8 km spans between
hills Laxmidungri on left and Chandli-dungri on the right. The dam is flanged
by 21 km long earthen dykes, both on left and right sides to close the low
saddles beyond the abutment hills. It has the distinction of being at one time
the longest earth dam in the world, being 25.8 km long with dams and dykes taken
together. It also has the rare distinction of forming the biggest artificial
lake in Asia with reservoir spread of 743 sq. km at full reservoir level.
Hirakud dam intercepts 83400 sq. km of Mahanadi catchment. The reservoir has
life storage of 5818 million cubic meter with gross storage of 8136 million
from dam enters the turbine through trash rack, intake structure and penstock
and gets discharged to the tailrace through draft tube. To control the flow,
hydraulic intake gates are provided for each machine.
The power component of HPS consists of:
- Power House I at Burla.
- Power Channel- a 25
km long water conductor system to carry the tailrace water from Burla power
house to Chiplima power house.
- Power House- II at
components were completed under three stages which are briefly described below:
The main features of Stage
I are dam and appurtenant works, canal system and power generation & transmission.
Four generating units with installed capacity 123 MW (2x37.5 + 2x24) were
completed in PH-I at Burla.
feature of stage II are Power channel, power generation at PH I & II and
Two more generating units with installed capacity of 75 MW (2 x 37.5) were
added in power house Burla. Three generating units with installed capacity
of 72 MW (3x 24) were completed in Power House- II at Chiplima. The work under
stage II was started on Jan. 1957 and was inaugurated by late Dr. A. N. Khosla.
under stage III covers the installation of 7th Unit (37.5 MW) at Power House-I,
Burla. The work started on 1st December, 1982 and completed on 13th September,