The irrigation projects are classified into three categories viz major, medium and minor. Projects which have a Cultivable Command Area (CCA) of more than 10,000 ha. are termed as major projects, those which have a CCA of less than 10,000 ha. but more than 2,000 ha. are termed as medium projects and those which have a CCA of 2,000 ha. or less are known as minor projects. A broad assessment of the area that can be ultimately brought under irrigation, both by surface and ground water, made by the various States in sixties has indicated that ultimate irrigation potential of the country would be of the order of 113 m.ha.. However, the ultimate potential is 139 m.ha, the increase being primarily due to upward revision in assessed potential of minor ground water schemes and minor surface water schemes to 64 m.ha and 17 m.ha respectively. Minor irrigation projects have both surface and ground water as their source, while major and medium projects mostly exploit surface water resources.