OHPC Hydro Power Dam

Hirakud -I (Water Conductor System)

Penstocks
Number 7
Internal Dia. 7.6 M (Unit 1, 2, 5, 6 & 7) , 6.1 M (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 1:01
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 Slope 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 FT X 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 4.876 X 2.438 M (16′ X 5′)
Sill Level RL 500
Capacity 65.13 CUMECS (2300 CUSECS)

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