|Agricultural Development and Vector-Borne Diseases (FAO - HABITAT - UNEP - WHO, 1996, 91 p.)|
|Topic F: Water use in agriculture|
Slide F.8 Lined canal and canaletti, Morocco
Canaletti are elevated, concrete water conveyance systems. They are constructed of prefabricated units and are particularly functional in areas where extensive irrigation is introduced in highly permeable soils. Examples can be found in Morocco and in Turkey. Little water is lost to seepage in canaletti systems, and as a result mosquito vector breeding in relation to the irrigation system as such as minimum. Schistosomiasis risks are associated with ancillary hydraulic structures such as weirs.
Unfortunately, a good system of afferent canals does not necessarily imply proper drainage. In the 1970s, an outbreak of malaria in Turkeys Çukurova Plain near Adana was caused by insufficient drainage of canaletti-fed cotton production schemes.