Design of Canal (Kennedy & Lacey Theory) & Diversion Headwork

Canal Irrigation & Diversion Headwork
Design of Canal
Kennedy & Lacey Theory

1. Ramanuj jaldhari Water Resource Engineering V Sem (CE)

2. CANAL IRRIGATION & DIVERSION HEAD WORK

3. CANAL IRRIGATION & DIVERSION HEAD WORK

4. INTRODUCTON Canal It is an artificial channel constructed on ground to carry water to the field either from the River or Tank or Reservoir.

5. Classification of Canal Basis on Nature of Source of Supply Permanent Canal Inundation Canal Basis on Financial Output Productive Canal Protective Canal

6. Classification of Canal Basis on Function of Canal Irrigation Canal Carrier Canal Feeder Canal Navigation Canal Power Canal

7. Classification of Canal Basis on Boundary Surface of Canal Alluvial Canal Non Alluvial Canal Rigid Boundary Canal

8. Difference b/w lined & Unlined Canal

9. Regime Canal A Canal is said to be in a state of regime If there is no sitting Velocity of water in channel is greater than critical velocity.

10. Design of Unlined Canal Unlined canal is designed by Two theories. Kennedy’s Theory Lacey’s Theory

11. Design of Unlined Canal Unlined canal is designed by Two theories. Kennedy’s Theory Lacey’s Theory

12. Kennedy’s Theory Theory given in 1895. Kennedy has conducted experiments on a number of sites on the upper Bari Doab canal system (At that time in Punjab but now in Pakistan), made the observations as a result of study of data over 30 years, as given below. (a) Flowing water has to counter act some amount of friction against the bed of the canal. (b ) Friction to the flowing water gives rise to vertical eddies rising up smoothly to the surface from base of canal. (c) Generation of eddies are responsible for keeping most of the silt in suspension .

13. Kennedy’s Theory Design Steps

14. Kennedy’s Theory Design Steps

15. Kennedy’s Theory Design Steps

16. Kennedy’s Theory Design Steps

17. Kennedy’s Theory Drawbacks

18. Lace y’s Theory Given theory in 1939. Consider Kennedy’s theory drawbacks. States for regime condition of canal.

19. Lacey’s Theory

20. Lacey’s Theory

21. Lacey’s Theory

22. Lacey’s Theory

23. Lacey’s Theory Drawbacks i . All formulae are empirical. ii. True regime conditions cannot be easily achieved in reality. iii. Silt friction factor f varies on different factors. iv. Characteristics of regime channel are not defined precisely. v. Concept of semi-elliptical c/s of a regime channel has limited Acceptance. vi. Perfect definitions of silt grade and silt charge are not given.

24. Difference B/W Kennedy’s & Lacey’s Theory

25. Any Query……???