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Odisha Hydro Power Corporation Ltd.

A Gold rated State PSU( A Govt. of Odisha Undertaking )

Powering Green Energy
Sh Vishal Kumar Dev, IAS
Commissioner-cum-Secretary to Government, Sports & Youth
Services, Department and, Chairman-cum-Managing
Director, OHPC Ltd.

Hirakud -I (Water Conductor System)

PENSTOCKS
Number     7
Internal dia.        7.6 m (unit 1,2,5 ,6 & 7) , 6.1M (3 & 4)
Max. velocity     3.7 m/s (unit 5 ,6 & 7)
2.5 m/s (3 & 4)
No of turbine fed by each
Penstock  One
Max. discharge capacity               166.6 (unit 5 ,6 & 7) , 94.0 CUMECS(3 & 4)
POWER CHANNEL
TOTAL LENGTH                          25.45 KM (83465 FT.)
1ST REACH UPTO POND NO. 1 REGULATOR   9.18 KM (30100 FT.)
2ND REACH UPTO CHIPLIMA                           16.27 KM (53365 FT.)
A)      1ST REACH (FULLY LINED)
BED WIDTH                                                     52.43 M (172 FT.)
BED SLOPE                                                      1 IN 10000
SIDE SLOPE                                                       1:1
FULL SUPPLY DEPTH.                                             7.01 M (23 FT.)
DISCHARGE AT RL 520                                          509.77 CUMECS
                                                                         (18000 CUSECS)
DISCHARGE AT RL 525                                         708.01 CUMECS (25000 CUSECS)
(DESIGNED VALUES)
STORAGE CAPACITY OF POND I FROM RL 516 TO RL 521 = 7.10 M CUM (5764 ACFT.)
B) 2ND REACH (PARTLY UNLINED & PARTLY LINED)
BED WIDTH IN UNLINED SECTION                         83.51 M (274 FT.)
BED WIDTH IN LINED SECTION                               52.42 M (172 FT.)
BED WIDTH IN HILL CHANNEL (FULLY LINED)        38.40 M (126 FT.)
BED SCOPE                                                          1 IN 10000
HILL CHANNEL                                                       1 IN 5000
DISCHARGE                                                           368.11   CUMECS (13000 CUSEC) *
                                                                354.00   CUMES
* DESIGNED VALUE BUT IN ACTUAL PRACTICE  LIMITED TO (12,500 CUSECS.)
C) HEAD REGULATOR AT POND NO. I
NO. OF VENTS                                                       6
SIZE OF VENTS                                                       7.62 X 3.048 M (25 FTX 10 FT.)
SILL LEVEL                                                           RL 505
CAPACITY                                                               382.32 CUMECS (13500 CUSECS)
D) SYPHON SPILLWAY AT POND NO. I
CAPACITY                                                               566.41 CUMECS (20000 CUSECS)
PRIMING                                                  RL 521.30
DEPRIMING                                                             RL 519.50
E) CROSS REGULATOR AT RD 63 450
NO OF VENTS                                                          3
SIZE OF VENTS                                                       4.876X2.438 M (16'X5')
SILL LEVEL                                                              RL 500
CAPACITY                                                                65.13 CUMECS (2300 CUSECS)