Improving water distribution command area distribution structures
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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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IMPROVING WATER DISTRIBUTION Command Area Distribution Structures

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Improving water distribution command area distribution structures

4.3

IMPROVING WATER DISTRIBUTIONCommand Area Distribution Structures


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


Model 2 flow distribution structure

Model 2: Flow distribution structure


Improving water distribution command area distribution structures

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


Geotextile inside gabion mattrass

Geotextile inside gabion mattrass

SOME HINTS


Alternative to gabion structures

Alternative to gabion structures

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


Stone cones

Stone cones


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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