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close this bookAgricultural Development and Vector-Borne Diseases (FAO - HABITAT - UNEP - WHO, 1996, 91 p.)
close this folderTopic F: Water use in agriculture
View the documentList of slides
View the documentF.1 Eighty percent of freshwater use is for agriculture
View the documentF.2 Water lifting for irrigation by human power, West Africa
View the documentF.3 Water lifting for irrigation by human power, India
View the documentF.4 Water lifting for irrigation by human power, China
View the documentF.5 Water lifting for irrigation by human power, China
View the documentF.6 Water lifting for irrigation by animal power, Egypt
View the documentF.7 Water lifting for irrigation by tractor, Tunisia
View the documentF.8 Lined canal and canaletti, Morocco
View the documentF.9 Hood irrigation, Egypt
View the documentF.10 Furrow irrigation with siphons, Tunisia
View the documentF.11 Sprinkler irrigation, India
View the documentF.12 Central pivot irrigation, Zambia
View the documentF.13 Trickle or drip irrigation, bananas, Egypt
View the documentF.14 Trickle or drip irrigation, tomatoes, Egypt
View the documentF.15 Irrigation canal and turn-outs, Pakistan
View the documentF.16 Effects of lack of infrastructure and poor irrigation management, Pakistan
View the documentF.17 Effects of lack of infrastructure and poor irrigation management, Pakistan
View the documentF.18 Waterlogged fields with crops
View the documentF.19 Waterlogged soybeans in the USA
View the documentF.20 Minor canal with aquatic weeds, Rahad, Sudan
View the documentF.21 An irrigation scheme in an arid area, Chad
View the documentF.22 Tank with dense Salvinia growth, Sri Lanka
View the documentF.23 Water storage for drinking water and livestock
View the documentF.24 Shallow well, Mozambique
View the documentF.25 Improved well, Keita, Niger
View the documentF.26 Village hand pump, Nepal
View the documentF.27 Aquaculture, India
View the documentF.28 Aquaculture in rice fields
View the documentF.29 Trimming and cleaning of a fishpond

F.8 Lined canal and canaletti, Morocco


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 Turkey’s Çukurova Plain near Adana was caused by insufficient drainage of canaletti-fed cotton production schemes.