is the management technique which eliminates the wastage of water or maximises the efficiency of its use.

The correct answer is Water Conservation.

Key Points Definition → Water conservation is the practice of using water efficiently to reduce unnecessary water usage [reducing water wastage].

• Water conservation refers to the practice of using water wisely and efficiently to preserve this vital natural resource. It involves
  • reducing water waste,
  • managing water usage,
  • protecting water quality for both present and future generations

• Factors Affecting Water Usage: 
  • Population, household size, and growth and affluence
  • Climate change
• Less than 1% of the world's water is freshwater. One objective is to ensure water availability for future generations without surpassing the natural replenishment rate.

Additional InformationSoil Conservation → It refers to the prevention of loss of the topmost layer of the soil from erosion or prevention of reduced fertility caused by over usage, acidification, salinization or other chemical soil contamination.

What is Evapotranspiration → It is the process by which water is transferred from the land to the atmosphere by evaporation from the soil and other surfaces and by transpiration from plants through their porous surfaces such as leaves, etc.