Table 5 gives the information about Kanyonyomba marsh users before the implementation of irrigation system.
According to Table 5, it appears that 33% of the farmers were already working in the swamp. This means that
the irrigation system has the effect of increasing the number of marsh users in the swamp. Thus, irrigation system
in this marsh has the effects of concentrating and intensifying production on a smaller area resulting in the
protection of forests or wild lands from being converted to agriculture [4].
Respondents told us that all the swamp was not exploited before the implementation of irrigation system. Exploited
part of the marshland of Kanyonyomba was characterized by mixed farming while the unexploited part
was undrained marshland with a typical savanna vegetation dominated by papyrus species of grasses and several