Download - Shabelle River Wocca
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Shabelle River
Challenges and solutions
Robbert van der Steeg, WOCCA
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Source: SWALIM
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El Nino in 2015• Flash floods• High water level• Preparedness at
regional level• Drought in parts of
Ethiopia• Weak points were
mapped
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Perception of the people• Loss of productive assets and sometimes lives• Flood frequency increases• Past measures: dredging, maintenance of canals and
embankments• Solutions:
– Strengthening river Embankment– De-silting of the River Bed– Preposition of Sand Bags at village Level– Continuous recording of the River Level – Rehabilitation of Sabun/FAO canal and Chinese Canal that can
reduce the risk of Floods.
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Characteristics of the River
• Lots of sedimentation• Serves irrigation system since 1925 (Weir)• Limited maintenance since the war started• Concrete intakes but many are done with
sandbags (although diminishing)• Floods are increasing in frequency• Floods can also be caused by overflowing of
the embankment
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Sedimentation
Photo GSA/YME
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Weir
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Irrigation system and flood relief canal
Information source: MottMacDonald
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Solutions
• Higher embankments• Higher embankments further away from the
river• Restoration of the flood relief system• Dredging
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Embankment improvement
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Irrigation system and flood relief canal
Information source: MottMacDonald
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Dredging
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Thank you