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1. HIGHWAY DRAINAGE
STRUCTURE
CHAPTER FIVE
Drainage Structure
1

2. Objective

Drainage Structure
2

3. Introduction

Drainage Structure
3

4. Two Sources of water

Drainage Structure
4

5. Surface Drainage

Drainage Structure
5

6. Rural Surface drainage system
Drainage Structure
6

7. Urban Surface drainage system
Drainage Structure
7

8. Highway Drainage Structure
Drainage Structure
8
Two General Categories of Drainage Structure

9. Drainage Structure
9
Rectangular Box Culvert

10. Drainage Structure
10
Corrugated Steel Pipe
Culvert
Open Alignment
Drainage

11. Drainage Structure
11
Sediment and Erosion Control

12. Drainage Structure
12
Hydrological Consideration

13. Drainage Structure
13
Design Frequency and Spread Vs. geometric
Design standard (ERA 2002)

14. Drainage Structure
14
Factors Affecting Floods

15. Drainage Structure
15
Factors Affecting Flood Runoff

16. Drainage Structure
16
Determination of Runoff

17. Drainage Structure
17
Rational Method

18. Drainage Structure
18
Runoff Coefficient, C

19. Drainage Structure
19
Runoff Coefficient, C from ERA 2002

20. Drainage Structure
20
Other Value of C

21. Drainage Structure
21
Adjusted Rational Method

22. Drainage Structure
22
Values of Frequency Factor Cf

23. Drainage Structure
23
Rainfall Intensity of Jimma Area

24. Drainage Structure
24
Design of Open Channel

25. Drainage Structure
25
Design Principle

26. Drainage Structure
26
The Manning’s Formula

27. Drainage Structure
27
Culverts

28. Drainage Structure
28
Types of Culverts

29. Drainage Structure
29
Typical Plan of Culverts End Wall Using
Concrete

30. Drainage Structure
30
Typical Plan of Culverts End Wall Using
Masonry

31. Drainage Structure
31
Typical Plan of Box Culverts

32. Drainage Structure
32
Unsubmerged Flow Type

33. Drainage Structure
33
Submerged Flow Type

34. Drainage Structure
34
Design of Culverts

35. Gutter Design

Drainage Structure
35

36. Manning’s values for street and pavement gutters

Drainage Structure
36

37. 1. Uniform Cross Slope
 The nomograph is used with the following
procedure to find gutter capacity for uniform
cross-section
Drainage Structure
37

38. Cont.….

Drainage Structure
38

39. 2. Composite Gutter Section
Drainage Structure
39

40. Inlet
Drainage Structure
40

41. Types of Inlet

Drainage Structure
41

42. CONT…

Drainage Structure
42

43. Curb-inlet On Grade

Drainage Structure
43

44. Curb-inlet On Sag

Drainage Structure
44

45. Drainage Structure
45

46. Drainage Structure
46

47. Drainage Structure
47

48. Access/Man Holes Location

Drainage Structure
48

49. Drainage Structure
49

50. Drainage Structure
50

51. Drainage Structure
51

52. Drainage Structure
52
Design of Bridge

53. Exercise 1
Drainage Structure
53

54. Exercise 2

Drainage Structure
54

55. Drainage Structure
55