Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Irrigation is the single biggest use of water. Overhead irrigation wastes a lot of water. Drip irrigation wastes a lot less. Figure below shows a drip irrigation system. Water pipes run over the surface of the ground. Tiny holes in the pipes are placed close to each plant. Water slowly drips out of the holes and soaks into the soil around the plants. Very little of the water evaporates or runs off the ground. Answer: drip irrigation
Does overhead irrigation or drip irrigation use less water?