Water Conveyance Loss and Designing Conveyance System - Practices of Irrigation and On-farm Water Management - page 1

Chapter 1
Water Conveyance Loss and Designing
Conveyance System

Contents

1.1 Water Conveyance Loss ........................... 2

1.1.1 Definition of Seepage ........................

2

Factors Affecting Seepage ......................

1.1.2 2

Expression of Seepage ........................ 1.1.3 3

1.1.4 Measurement of Seepage ...................... 4

1.1.5 Estimation of Average Conveyance Loss

in a Command Area .......................... 7

Reduction of Seepage ........................ 1.1.6 8

Lining for Reducing Seepage Loss ..................

1.1.7 8

1.2 Designing Open Irrigation Channel ...................... 10

Irrigation Channel and Open Channel Flow .............. 1.2.1 10

1.2.2 Definition Sketch of an Open Channel Section ............. 10

Considerations in Channel Design .................. 1.2.3 11

Calculation of Velocity of Flow in Open Channel ............ 1.2.4

12

1.2.5 Hydraulic Design of Open Irrigation Channel .............

14

Sample Examples on Irrigation Channel Design ............

1.2.6 18

1.3 Designing Pipe for Irrigation Water Flow ................... 21

Fundamental Theories of Water Flow Through Pipe ........... 1.3.1 21

1.3.2 Water Pressure - Static and Dynamic Head .............. 23

1.3.3 Hydraulic and Energy Grade Line for Pipe Flow ............

25

Types of Flow in Pipe - Reynolds Number ...............

1.3.4 25

1.3.5 Velocity Profile of Pipe Flow ..................... 26

1.3.6 Head Loss in Pipe Flow and Its Calculation .............. 26

1.3.7 Designing Pipe Size for Irrigation Water Flow ............. 31

Sample Workout Problems ......................

1.3.8 32

Relevant Journals ................................

32

Questions .................................... 33

References ................................... 34