Domestic examples of water management are
Short flush toilets,
Showering instead of bathing,
Economy settings on dishwashers and washing machines,
Greywater used on the garden,
Rain collection for watering the garden.
Industrial examples of water management are
Installing water meters at production plants,
Educate staff about the use of water in the anitation facilities,
Reusing waste water.
Agricultural examples of water management are
Drip irrigation as it delivers water straight to the plant roots with minimal losses,
Rainfall sensors can be used so that crops are only watered when they need it,
Creating furrows in the fields to retain water and to prevent run off.