hydraulic structures in irrigation distribution systems l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Hydraulic Structures in Irrigation Distribution Systems PowerPoint Presentation
Download Presentation
Hydraulic Structures in Irrigation Distribution Systems

Loading in 2 Seconds...

play fullscreen
1 / 27

Hydraulic Structures in Irrigation Distribution Systems - PowerPoint PPT Presentation


  • 862 Views
  • Uploaded on

Hydraulic Structures in Irrigation Distribution Systems. Chapter 5. Valves in pipe networks. On-Off valves Throttling valves Pressure Regulating Valves Check Valves Surge Control Valves Pressure Relief Valves Vacuum relief valves (Air release valves. Pressure regulating valve.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Hydraulic Structures in Irrigation Distribution Systems' - hasad


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
valves in pipe networks
Valves in pipe networks
  • On-Off valves
  • Throttling valves
  • Pressure Regulating Valves
  • Check Valves
  • Surge Control Valves
  • Pressure Relief Valves
  • Vacuum relief valves (Air release valves
flow measurements in pipelines
Flow measurements in pipelines
  • differential pressure flow meters
    • Venturi meters
    • Orifice meters
    • Elbow meters

Rotating mechanical flow meters

Bypass flow meters

Ultrasonic flow meters

Magnetic Flow meters

control structures in open channels
Control structures in open channels
  • Intake structures
  • Check structures
  • Check-drops
  • Drop and chute structures
flow measurements in open channels
Flow measurements in open channels
  • Volumetric method
  • Velocity area method
    • Using float method
    • Current meters
  • Control sections
    • Thin plate weirs
    • Broad Crested weirs
    • Flumes
assumptions
Assumptions
  • no head losses (E1 = E2) (the means no significant turbulence)
  • water surface elevation remains constant, note: this is physically impossible, but actual errors are small
  • pressure at crest (station 2) = Patmo throughout depth.
slide21

For Cd=0.611, weir equation becomes:

  • For SI units, g= 9.81 m/s2, or
  • For foot units, g=32.2 ft/s2, or
  • In general, discharge could be given by:
  • Where, C is a weir coefficient.
weirs
Weirs
  • Advantages:
    • Accurate measurement.
    • Simple and easy to construct with non-obstruction by moss (type of algae) or floating materials.
    • Durable
  • Disadvantages:
    • Require considerable fall of water surface.
    • Deposition of sand, gravel and silt upstream of weirs
example
Example
  • An end-contracted weir of total length 286 ft and crest height 5 ft is used to discharge water without exceeding a head of 2.5 ft from a tank 300 ft wide. The weir carries piers that are 10 ft clear distance apart and 2 ft wide, to support the footway. Determine the discharge. Cd = 0.6