The National Irrigation Board was established in 1966 through an Act of Parliament (Cap 347) to take over the activities of ALDEV. The Board took over the running of Mwea, Hola and Perkerra. Later, the Board developed Ahero, West Kano, Bunyala and Bura schemes.
The first three schemes were developed as pilot schemes in the 1960s and early 1970s and remain so even today. The NIB later expanded the Hola and the Mwea schemes and transferred the control of the Bura Irrigation Scheme to the Ministry of Agriculture. The Board has also facilitated research leading to the development of some public assisted irrigation schemes, such as the Yala Swamp and the South West Kano Schemes.