The area over which canal irrigation water flows by gravity is known as the command area in irrigation. Following are the types of Command Area.
1.1. Types of Command Area in Irrigation
1) Gross Command Area:
Gross Command Area is the total area which can be economically irrigated from an irrigation scheme without considering the limitations of water.
It is denoted by GCA. It includes cultivating land as well as roads, wastelands, forests, barren land, etc.
GCA = CCA + Uncultivable area
2) Culturable Command Area:
Culturable Command Area is the area in which crop is grown at a particular time or crop season. It is denoted by CCA.
Uncultivable areas are excluded from GCA to obtain CCA.The uncultivable area includes barren lands, forests, etc.
CCA=GCA – Uncultivable area
The culturable Command Area can be of two types. They are:
a) Culturable Cultivable Area:
It is the area within the culturable command area where cultivation is actually done at present.
b) Culturable Uncultivable Area:
It is the area within the culturable command area where the cultivation is possible but not done at present.
3) Net Command Area:
It is the Culturable Command Area obtained after the deduction of canal networks, supply ditches etc constructed in the field. It is denoted by NCA.
NCA=CCA – the area occupied by canals, canals network and ditches.
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