The 'command area' of a tank depends on:
Choose the correct answer
Only the tank surface area
Tank capacity (available water), sluice location (command height), crop demand, and topography below the sluice
Only depth of water in tank
Number of irrigation channels
Correct Answer
B. Tank capacity (available water), sluice location (command height), crop demand, and topography below the sluice
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Tank command area: governed by: (1) Sluice location and height (determines area that can be gravity-irrigated); (2) Tank capacity (total water available = storage); (3) Crop water requirement and season; (4) Rainfall in catchment. Command area = f(storage, release, and topography below sluice). Ayacut = net irrigated command area. Ayacut/catchment ratio: 1:25 to 1:50 for peninsular tanks.
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