Concept:Water Harvesting: Water harvesting is a practice to conserve water by collecting rainwater in an organized way.The rainwater is not allowed to flow and get wasted but collected in tanks.The main purpose however is not the collection but the enhancement of groundwater levels. The collected water through tubes is made to recharge groundwater.Maintenance of groundwater is a long term sustainable structure for water conservation.Here the logic is the methods which consume water:Explanation:Kneading:Kneading is a process in the making of dough by mixing water and flour.Example: Kneading dough for roti.Kneading Consumes waterSwimming also needs water to do so.Preparing tea is also a process that consumes.While combing hair, no need of water.