DESIGN OF OUTLET WORKS
Jabori Hydropower Project
Low level outlets:
Designed Width of the outlet B = 3 m
Designed Depth of the outlet D = 3 m
Max. Flood Level = 1384.50 m
Invert Level of outlet = 1377 m
Centre point level of the outlet = 1378.5 m
C = 0.91 m Slightly rounded entrance
Discharge per outlet Q = 88.9 cumecs
Velocity V = 9.9 m/sec
No. of outlets (undersluices) = 3.0
Total discharge through undersluices = 266.6 cumecs 9416
cusec
Undersluices:
Designed Width of the outlet B = 1.5 m
Designed Depth of the outlet D = 2 m
Max. Flood Level = 1384.50 m
Invert Level of outlet = 1377 m
Centre point level of the outlet = 1378 m
C = 0.91 m Slightly rounded entrance
Discharge per outlet Q = 30.8 cumecs
Velocity V = 10.3 m/sec
No. of outlets (undersluices) = 3.0
Total discharge through undersluices = 92.5 cumecs
Total Discharge Passing
Spillway = 119.25 cumecs
4 Low Level Outlets = 266.6 cumecs
3 undersluices = 92.5 cumecs
Total = 478.32 cumecs
PATH OF JET
Jabori Hydropower Project
Low level outlets
Invert level of outlets = 1377 m 4517.9 ft
Height of outlets = 3 m 9.8 ft
Max. flood level MFL = 1384.5 m 4542.5 ft
Head on centre of the outlet h = 6 m
Coefficient of discharge Cv = 0.91
Path of the jet Page 4.4, Handbook of hydraulics by Brater King
y x
El. w.r.t centre of o/let
1378.5 0.0 0.00
1378.0 0.5 3.15
1377.5 1.0 4.46
1377.0 1.5 5.46
1376.5 2.0 6.30
1376.0 2.5 7.05
1375.5 3.0 7.72
1375.0 3.5 8.34
1374.5 4.0 8.92
1374.0 4.5 9.46
1373.5 5.0 9.97
1373.0 5.5 10.46
Path of Jet (Low level outlets)
1379.0
1378.0
1377.0
1376.0
Elevation (m)
1375.0
1374.0
1373.0
1372.0
1371.0
1370.0
0.00 2.00 4.00 6.00 8.00 10.00 12.00
Distance (m)
Undersluices
Invert level of outlets = 1377 m 4517.9 ft
Height of outlets = 2 m 6.6 ft
Max. flood level MFL = 1384.5 m 4542.5 ft
Head on centre of the outlet h = 6.5 m
Coefficient of discharge Cv = 0.91
Path of the jet Page 4.4, Handbook of hydraulics by Brater King
y x
El. w.r.t centre of o/let
1378.0 0.0 0.00
1377.5 0.5 3.28
1377.0 1.0 4.64
1376.5 1.5 5.68
1376.0 2.0 6.56
1375.5 2.5 7.34
1375.0 3.0 8.04
1374.5 3.5 8.68
1374.0 4.0 9.28
1373.5 4.5 9.84
1373.0 5.0 10.38
Path of Jet (Undersluices)
1379.0
1378.0
1377.0
1376.0
Elevation (m)
1375.0
1374.0
1373.0
1372.0
1371.0
1370.0
0.00 2.00 4.00 6.00 8.00 10.00 12.00
Distance (m)
DESIGN OF PLUNGE POOL
Jabori Hydropower Project
Page 402, Design of Small Dams (USBR)
Invert level of outlets = 1377 m 4517.9 ft
Height of outlets = 3 m 9.8 ft
Tail water level = 1375.91 m 4514.4 ft
Tail water level from Hec-ras against "when only undersluice outlets r operating".
Elevation drop H = 2.59 m 8.5 ft
Unit discharge q = 29.6 m2/s 318.86 ft2/s
Ultimate scour depth below tail water level, D = 14.64 m 48.04 ft
Ultimate scour level below tail water level = 1361.27 m
DESIGN OF OUTLET WORKS
A. Page 453, Design of Small Dams (USBR)
B. Flow with partially Open Surface Gates: Page 453, Design of Small Dams (USBR)
Page 458, Design of Small Dams (USBR)
C. Submerged controlled openings: Page 453, Design of Small Dams (USBR)
DESIGN OF PLUNGE BASIN
Page 402, Design of Small Dams (USBR)
PATH OF JET
Page 4.4, Handbook of hydraulics by Brater King
