The correct answer is: A. Separate system
A separate sewerage system is a system that has two separate pipes: one for sewage and one for stormwater. This type of system is the most common in developed countries.
A combined sewerage system is a system that has a single pipe that carries both sewage and stormwater. This type of system is more common in developing countries.
A partially combined system is a system that has a combination of separate and combined sewerage systems. This type of system is used in some areas that have a lot of rainfall.
In a country like India, where rainfall is mainly confined to one season, a separate sewerage system is the most suitable type of system. This is because a separate sewerage system will prevent sewage from being mixed with stormwater. This will help to reduce the risk of waterborne diseases.
A combined sewerage system is not suitable for India because it can lead to the discharge of sewage into rivers and streams during heavy rains. This can pollute the water and pose a health risk to people who use the water for drinking or bathing.
A partially combined system is not ideal for India because it does not provide the same level of protection as a separate sewerage system. However, it may be a better option than a combined sewerage system in some areas.
In conclusion, the most suitable sewerage system for a country like India is a separate sewerage system. This type of system will prevent sewage from being mixed with stormwater and will help to reduce the risk of waterborne diseases.