Well water is often preferred over canal water for irrigation because ____________________?
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Answer: A. Conveyance losses in well irrigation are less
Explanation
Well water is pumped close to the point of use, avoiding long canal losses. Canal systems suffer substantial conveyance losses through seepage and evaporation along channels. Pumping groundwater locally delivers water directly to fields with minimal transport wastage. Groundwater irrigation relies on tube wells tapping into subsurface aquifers using pumps. Canal irrigation requires vast networks of main canals, distributaries, and watercourses. Conveyance efficiency is the ratio of water delivered to fields versus water diverted at the source.
Farmers often prefer well water for its reliability and independence from distant dam releases. However, excessive well pumping can lead to regional groundwater depletion and land subsidence. Conjunctive use combines canal and well water to optimize agricultural water supply reliability. Well water is not necessarily clearer than canal water because both can contain suspended silt. Lifting water increases operational pumping costs rather than making well water preferable. Well water being used economically is secondary to the primary advantage of avoided conveyance losses.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
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