Is the lack of sufficient available water resources to meet water needs within a region.
It affects every continent and around 2.8 billion people around the world at least one month out of every year. More than 1.2 billion people lack access to clean drinking water.
Water scarcity involves water shortage, water stress or deficits, and water crisis. Etc
Above mentioned except Rajasthan all other places water scarcity is mainly due to more population, urbanization etc.
Due to this water scarcity they are many interstate river water disputes. Based on this government of India started the Interstate River Water Disputes Act, 1956 (IRWD Act) is an Act of the Parliament of India enacted under Article 262 of Constitution of India.
These disputes are under two cases :
i. Actions of a downstream state affecting the interest of an upstream state
ii. Actions of an upstream state affecting the interest of a Downstream state.