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Re-optimization and
reoperation study of the
Akosombo and Kpong dams
Dr Marloes Mul
Pre-dam conditions
• 51,800 ha of flood
recession farming
• £160,000
• Dry season flows
insufficient for irrigation
• Fert...
PRE- AND POST DAM AGRIC ACTIVITIES
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Before dam construction
Flood recession...
PLANNED IRRIGATION DEVELOPMENT
• Irrigation (future)
– Kpong left bank – 3,800 ha
– Kpong right bank extension – 8,000ha
–...
• Flood recession agriculture
– Predictable flooded areas (larger the better, for
August and September)
• Irrigation
– Cur...
DAMAGES AGRIC SECTOR
• Costs
– Floods affecting irrigation infrastructure
– US$13,096 and US$ 19,828 per hectare
Flow in m...
• Domestic water use
– Accra – 56 Mm3/a
– GWCL other 23 Mm3/a
– Other water users (industries, hotels) – 8.5 Mm3/a
• Infra...
Thank you for your attention
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Agriculture component of the re-optimization and reoperation study of the Akosombo and Kpong dams

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Presented by IWMI researcher, Marloes Mul, on the Re-optimization and reoperation study of the Akosombo and Kpong dams - Ghana, August 2015. Presented during a stakeholder workshop held in Accra to explore the potential positive and negative impacts of changing flows.

Publié dans : Environnement
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Agriculture component of the re-optimization and reoperation study of the Akosombo and Kpong dams

  1. 1. Re-optimization and reoperation study of the Akosombo and Kpong dams Dr Marloes Mul
  2. 2. Pre-dam conditions • 51,800 ha of flood recession farming • £160,000 • Dry season flows insufficient for irrigation • Fertile soils • Timing unreliable Post-dam conditions • Rainfed farming • Small scale irrigation • Large scale public and private irrigation – Public – 5,500ha – Private – 1,300 ha (and 2,000 within public schemes) AGRICULTURE COMPONENT
  3. 3. PRE- AND POST DAM AGRIC ACTIVITIES Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Before dam construction Flood recession farming Rainfed farming After dam construction Irrigation Rainfed farming
  4. 4. PLANNED IRRIGATION DEVELOPMENT • Irrigation (future) – Kpong left bank – 3,800 ha – Kpong right bank extension – 8,000ha – Accra Plains Irrigation Project – upto 200,000 ha (but more realistically 150,000ha • Total water requirements (current 3,2 m3/s, future 105 m3/s)
  5. 5. • Flood recession agriculture – Predictable flooded areas (larger the better, for August and September) • Irrigation – Current 3,2 m3/s – Future 105 m3/s – Water level at intake (Kpong, Akosombo) TARGET VALUES FOR AGRIC SECTOR
  6. 6. DAMAGES AGRIC SECTOR • Costs – Floods affecting irrigation infrastructure – US$13,096 and US$ 19,828 per hectare Flow in m3/s Q=3,000 Q=5,000 Q=7,000 Q=9,000 Q=10,000 Q=12,000 Q=14,150 Area Size (km2) 0 0 5 9 14 24 45 Future area (km2) 13 47 63 95 137
  7. 7. • Domestic water use – Accra – 56 Mm3/a – GWCL other 23 Mm3/a – Other water users (industries, hotels) – 8.5 Mm3/a • Infrastructural damages to be estimated per flood – Hotels – Houses – Industries TARGET VALUES FOR DOMESTIC
  8. 8. Thank you for your attention

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