- Asked 4/21
- 2081 Chaitra · 4 marks
- 2077 Chaitra · 1+3 marks
- 2074 Bhadra · 4 marks
- 2071 Magh · 4 marks
Water carriage vs conservancy sanitation
Short answer
Sanitation is the safe collection, removal, treatment, and disposal of human excreta, wastewater, and solid waste to prevent disease and maintain a clean environment. The conservancy system collects wastes in dry containers for manual removal, while the water-carriage system conveys all liquid wastes through closed underground sewers by water. Water-carriage is preferred because it is hygienic, eliminates foul smells and flies, operates automatically, requires less space, handles large volumes, and has lower operating costs.
Define sanitation. What is the major difference between the conservancy and water-carriage systems of sanitation? Justify why the water-carriage system is preferred (more popular) than the conservancy system.
Sanitation is the science and practice of maintaining healthy living conditions by the safe collection, removal, treatment and disposal of human excreta, wastewater and solid waste, so that disease is prevented and the environment stays clean.
Main difference
The two systems differ in how night soil (human excreta) and other wastes are removed.
- Conservancy system (dry system): wastes are collected in separate dry containers or pits. Night soil is stored in pans or vaults and carried by manual scavengers or vehicles to a disposal site. Kitchen and bath waste (sullage) and storm water are taken through separate drains, and refuse by carts.
- Water-carriage system: all liquid wastes, including night soil, are carried by water through closed underground sewers by gravity to the treatment plant.
Comparison
| Point | Conservancy | Water carriage |
|---|---|---|
| Carrying medium | Hand, cart, vehicle | Water in sewers |
| Health risk | High, manual handling of excreta | Very low, closed pipes |
| Smell and flies | Common | Almost none |
| Labour | Large, scavengers needed | Little, mostly automatic |
| Initial cost | Low | High |
| Operation cost | High in the long run | Low |
| Suitable for | Small towns, villages | Large towns, cities |
| Water need | Little | Much (about 100 lpcd or more) |
Why water carriage is preferred
- It is hygienic: excreta never come in contact with people, so there is little chance of disease.
- There is no foul smell or fly breeding because the sewers are closed and underground.
- It is automatic, fast and continuous; no scavengers are needed.
- It takes less space and does not pollute streets or the groundwater near houses.
- It can handle large quantities of waste from dense populations and allows proper treatment and reuse.
- Its running cost is low, and it gives comfort and a better standard of living.
Its drawbacks are high initial cost, need for plenty of water and skilled operation, but for a populated town its benefits are much greater.
✓ Answer checked by Claude Opus 5.5 (high effort)
Related questions
- Separate vs combined sewerage systems · Sanitary Engineering, chapter 1 · asked 4×
- Storm water estimation and its limitations · Sanitary Engineering, chapter 2
- Circular sedimentation tank, population 80000 · Sanitary Engineering, chapter 7 · asked 2×
- Completely mixed ASP reactor, 10,000 m³/day · Sanitary Engineering, chapter 7
- T/F: radial more reliable than network · Transmission and Distribution System Design, chapter 5 · asked 2×
- T/F: more circuits rather than higher voltage · Transmission and Distribution System Design, chapter 2
- RE: no more than 3 a's · Theory of Computation, chapter 2
- Why 3D graphics is more complex than 2D · Computer Graphics, chapter 4