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Preferred source for hilly region

Short answer

A protected spring is most preferred in hilly Nepal because it flows by gravity without pumping, is clear and nearly bacteria-free, low cost, perennial, locally available, and uses simple technology. A perennial stream with a sedimentation tank is the next choice; wells and rivers are less suitable due to depth and pumping needs.

Among the available sources, which type of source is preferred in the public water supply system of a community in the hilly region of Nepal, and why?

In the hilly region of Nepal, a spring (protected by a spring box) is the most preferred source, followed by a perennial stream or small river.

Reasons

  1. Gravity flow: Springs occur at high elevation, so water reaches the village by gravity. No pumping or electricity is required, which cuts the operating cost.
  2. Good quality: Spring water is filtered by soil and rock, so it is clear and almost free from bacteria. Little or no treatment is needed; usually only chlorination is required.
  3. Low cost: The intake is simple (a spring box), and the scheme is cheap to build and easy for the community to run and maintain.
  4. Reliability: Many springs are perennial. Once the dry-season discharge has been checked, they give a dependable supply.
  5. Local availability: Springs are abundant on hill slopes, while rivers lie deep in the valleys far below the settlements, making lifting expensive.
  6. Simple technology: Locally available materials and local labour can be used.

Where springs are insufficient, a stream with a sedimentation tank is used. Wells and rivers are less suitable in the hills because of their depth and the need for pumping.

✓ Answer checked by Claude Opus 5.5 (high effort)

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