GCA, CCA, NCA

Gross Command Area (GCA)

• GCA is the total area bounded between total boundary of an irrigation project.
• It includes both cultivable as well as uncultivable land.
• It contains unfertile land (barren land), ponds, villages, forest, etc.

Cultivable (Culturable) command area (CCA)

• The area utilized for growing the crops is called cultivable command area.
• It is also called culturable command area.
• Generally, CCA = 80% of GCA.
• CCA = GCA - Uncultivable area 

Net Command Area:

• It is the CCA obtained after the deduction of canal network, supply ditches, bund etc. constructed in the field.
• NCA = CCA - area occupied by canals, canal network, ditches, etc.