Which one of the following statements is not an argument in favour of multi-purpose river projects?

1. Multi-purpose projects bring water to those areas which suffer from water scarcity.
2. Multi-purpose projects by regulating water flow helps to control floods.
3. Multi-purpose projects lead to large scale displacements and loss of livelihood.
4. Multi-purpose projects generate electricity for our industries and our homes.

Here are some false statements. Identify the mistakes and rewrite them correctly.

1. Multiplying urban centres with large and dense populations and urban lifestyles have helped in proper utilisation of water resources.
2. Regulating and damming of rivers does not affect the river's natural flow and its sediment flow.
3. In Gujarat, the Sabarmati basin farmers were not agitated when higher priority was given to water supply in urban areas, particularly during droughts.
4. Today in Rajasthan, the practice of rooftop rainwater water harvesting has gained popularity despite high water availability due to the Indira Gandhi Canal.

What is water scarcity and what are its main causes?

Compare the advantages and disadvantages of multi-purpose river projects.