Project name: Dawhenya
Year started: 1975
Year completed: 1978
Potential area: 450 ha
Developed area: 200 ha
Irrigated area: 150 ha
Irrigation type: Gravity + Pump
The Dawhenya Irrigation Project was developed by the State Farms Corporation in 1959 with the aim of producing vegetables for the Accra-Tema metropolitan area. Construction started in 1975 and was completed in 1978. It has a total irrigable area of 450 ha and 200 ha have so far been developed.
The Dawhenya reservoir, with a capacity of 5.8 mm3, receives its water from the Dechidaw River, which is ephemeral and has a catchment area of 500 km2 at the dam site.
The area lies entirely within latitudes 5o 04” N and 6o 00” and longitudes 0o 10:W and 0o 05” E. it is bounded in the north by the Akuapim mountains which trends northeast to southwest and in the south of the Accra-Aflao road in the east it shares boundary with the Volta basin and in the west the Densu basin. The two catchments lie entirely within the Accra Plains.
The two rivers feed the Ashaiman and Dawhenya reservoirs take their sources from the Akuapim Mountains. They flow steeply to the foothills laden with sediments. They then flow onto the gently rolling Accra plains until they discharge into the two reservoirs.
The climate is the coastal savannah type. The mean annual rainfall is 737 mm.
Water source/Head-works: A main dam (on River Dawhenya) feeds water into a night storage reservoir through an electrical pumping system. Two pumps operate at a pipeline to the storage reservoir, which feeds the paddy fields through a canal system. Water source is river Dawhenya.
Name of Scheme Manager: Mr. Benedictus Agbeko
Tel: 233 024 3833087