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　　RESPONSE BY STUDENT 2 Word count: 210

　　The professor made the point that the use of water for irrigation is very high. In general, agriculture uses a lot of water, and the water for irrigation cannot be used for other purposes. For example, it cannot be the water supply for homes and industry. The reading does not discuss this point.

　　Another important point is that some irrigation methods are not efficient in using water. For example, surface methods of irrigation use a lot of water. Surface methods deliver water to a field directly from a canal, well, of ditch. Examples are flooding, border irrigation, and basin irrigation. Surface methods are not efficient because they waste a lot of water. For example, the surface technique of flooding large fields requires a large amount of water. However, half of the water is used by the crop, and the rest is lost to evaporation. In general, surface methods of irrigation are not efficient, but the reading does not discuss this point.

　　Finally, the professor stated that some technology is more efficient than flooding. An example is the sprinkler method, which sprays crops with water. However, sprinklers are a surface method, and some water is wasted. In general, the professor discusses problems with surface irrigation that the reading dies not include.

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