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4.3. IMPROVING WATER DISTRIBUTION Command Area Distribution Structures. Gabion Distribution Structures. Advantages: Stabilize the channel bed Proportional distribution of the flow Disadvantages Downstream scour and gullying may undermine the structure

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gabion distribution structures
Gabion Distribution Structures
  • Advantages:
    • Stabilize the channel bed
    • Proportional distribution of the flow
  • Disadvantages
    • Downstream scour and gullying may undermine the structure
    • Gabions may be difficult to repair (gabion mats not easily available)
model 1 flow divider
Model 1: Flow divider

Distribution can be

adjusted with brushwood

Flow approaches

flow divider
Flow divider
  • Advantages
    • Easy to adjust flow distribution
    • Not sensitive to gullying
  • Disadvantages
    • Only works where soil is hard and stony – otherwise it creates scour and erosion of banks
slide6

Important to survey channel bed

downstream and check for gullies

SOME HINTS

The downsteam apron should

be long and deep enough to withstand

the upstream formation of gullies

use of geotextiles
Use of geotextiles

SOME HINTS

Prevents wash-out

of fine materials

underneath the gabions, which can

lead to overturning

Use of geotextile underneath gabions

alternative to gabion structures
Alternative to gabion structures

Stone cones buried deep inside river bed (Hadramawt, Yemen)

general principle
General principle!

Discuss and agree

the water

distribution

structures with the

representative

and authorized

group of water

users:

  • location
  • proportion
  • design
acknowledgement
Acknowledgement

This presentation was prepared with thanks to

Tzegai Teklemariam

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