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Improving Water Distribution
Improving Water Distribution
Improving Water Distribution
Improving Water Distribution
Improving Water Distribution
Improving Water Distribution
Improving Water Distribution
Improving Water Distribution
Improving Water Distribution
Improving Water Distribution
Improving Water Distribution
Improving Water Distribution
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Improving Water Distribution

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  • 1. IMPROVING WATER DISTRIBUTION Command Area Distribution Structures 4.3
  • 2. Gabion Distribution Structures <ul><li>Advantages: </li></ul><ul><ul><li>Stabilize the channel bed </li></ul></ul><ul><ul><li>Proportional distribution of the flow </li></ul></ul><ul><li>Disadvantages </li></ul><ul><ul><li>Downstream scour and gullying may undermine the structure </li></ul></ul><ul><ul><li>Gabions may be difficult to repair (gabion mats not easily available) </li></ul></ul>
  • 3. Model 1: Flow divider Flow approaches Distribution can be adjusted with brushwood
  • 4. Flow divider <ul><li>Advantages </li></ul><ul><ul><li>Easy to adjust flow distribution </li></ul></ul><ul><ul><li>Not sensitive to gullying </li></ul></ul><ul><li>Disadvantages </li></ul><ul><ul><li>Only works where soil is hard and stony – otherwise it creates scour and erosion of banks </li></ul></ul>
  • 5. Model 2: Flow distribution structure
  • 6. The downsteam apron should be long and deep enough to withstand the upstream formation of gullies Important to survey channel bed downstream and check for gullies SOME HINTS
  • 7. Use of geotextiles Use of geotextile underneath gabions SOME HINTS Prevents wash-out of fine materials underneath the gabions, which can lead to overturning
  • 8. Geotextile inside gabion mattrass SOME HINTS
  • 9. Alternative to gabion structures <ul><li>Stone cones buried deep inside river bed (Hadramawt, Yemen) </li></ul>
  • 10. Stone cones
  • 11. <ul><li>Discuss and agree </li></ul><ul><li>the water </li></ul><ul><li>distribution </li></ul><ul><li>structures with the </li></ul><ul><li>representative </li></ul><ul><li>and authorized </li></ul><ul><li>group of water </li></ul><ul><li>users: </li></ul><ul><ul><li>location </li></ul></ul><ul><ul><li>proportion </li></ul></ul><ul><ul><li>design </li></ul></ul>General principle!
  • 12. Acknowledgement <ul><li>This presentation was prepared with thanks to </li></ul><ul><li>Tzegai Teklemariam </li></ul>

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