Gross command area.pptx

gross

1. The gross command area is the total area bounded within the irrigation boundary of the project that can be irrigated economically without bothering about the limitation of quantity of water available . The gross command area includes the cultivable area and un-cultivable area. The examples of the un-cultivable area include ponds, residential areas, reserved forests and roads . A doab is an area between two drainages. When a canal system lies on a doab , the irrigation is economical. Here, the gross command area is the area enclosed by the drainages on both the sides and hence G.C.A forms the geographical area of the doab .

2. Gross Command Area:   ✔ Gross Command Area is the total area that can be economically irrigated from an  irrigation  scheme without considering water limitations . ✔ It is denoted by GCA . ✔ It includes cultivating land as well as uncultivating lands such as roads, wastelands, forests, barren lands, etc. GCA = CCA + Uncultivable area

3. These terms are mainly used in canal irrigation engineering. When a new canal is constructed, the engineers create its design maps etc. While doing so, they chalk out the entire area within an imaginary line that can be included in the irrigation project under development. This Gross Command Area (GCA) includes cultivable land as well as barren land, forests, houses, wasteland, roads etc . Cultivable Command Area is that part of Gross Command Area, which is fit for cultivating crops. So, cultivable area excludes forest and barren land from the Gross Command Area. What is left is uncultivable area. Gross Command Area=Cultivable Command Area + Uncultivable Area The key feature of cultural command area is that it can be physically irrigated from a scheme and is fit for cultivation of crops.