Concept:Water conservation means protecting water resources so that they are available for future use.Explanation:Afforestation and reforestation help conserve water by increasing groundwater recharge and reducing surface runoff.Damming stores water for later use, which is also a conservation practice.Deforestation removes trees and vegetation, which increases soil erosion and rapid water runoff.It reduces water retention and groundwater recharge, so it does not conserve water.Answer:Deforestation