49
Figure 10.3. Distribution of Full Control Surface Irrigation Drained
Source: AQUASTAT, 2013
10.1. African Group
Distribution of drainage areas in Benin has a value which is 5630 ha (Annex 10).
A similar situation is observed in non-irrigated cultivated area drained (dry farming)
areas. Non-irrigated cultivated area drained in Nigeria is close to 100% (Annex 10).
The same situation occurs in the areas having fully controlled drainage system
under surface irrigation in the African Group Countries. Sufficient data is unavailable
for the African Group countries that could be assessed. It is only 11% control surface
irrigation drained in the Benin (Annex 10).
10.2. Arab Group
Assessment of area of drainage under irrigated and non-irrigated areas of Arab
Group countries is the same as African Group countries. The data concerning the area of
drainage under irrigated and non-irrigated areas is not sufficient. Figure 10.4 shows that
Egypt has 3 million ha, Morocco has 0.6 million ha, Syria has drainage area of 0.25
million ha and Tunisia has 0.2 million ha area of irrigation that has drainage system.
Figure 10.5 shows the distribution of soil salinity in the areas having fully
controlled drainage system under surface irrigation in the Arab Group countries. Soil