Dont use too much resources  because when we use too much it will be destroy

Ensuring availability of water for future generations. This requires that the withdrawal of fresh water from an ecosystem does not exceed its natural replacement rate.
Energy conservation. Water pumping, delivery and waste water treatment facilities consume a significant amount of energy. In some regions of the world over 15% of total electricity consumption is devoted to water management.
Habitat conservation. Minimizing human water use helps to preserve fresh fire habitats for local wildlife and migrating waterfowl, as well as reduces the need to build new dams and other water diversion infrastructures.