“干旱”这个话题是既有自然属性,又有社会属性、制度属性和经济属性的问题,还是一个公共环境资源应用的问题。水是最重要的公共环境资源之一。这两年的大旱,使大家对农田水利的关注比以前多很多。进入新世纪以来中国数次大旱,2002年华北大旱,2006年川渝大旱,2008年春到2009年冬的华北旱情,2010年春的西南大旱,去冬到今春的华北和黄淮旱情。一到春天,耳边就是旱情消息,而且经常被冠以“多少多少年不 ”Drought “ is a topic that has both natural and social attributes, institutional attributes and economic attributes, or is a problem of the application of resources in the public environment. Water is one of the most important public environmental resources. The drought in these two years has brought much more attention to farmland water conservancy than before. Since the beginning of the new century, there have been many severe drought in China, the severe drought in North China in 2002, the drought in Sichuan and Chongqing in 2006, the drought in North China in spring 2008 and the winter in 2009, the drought in Southwest China in the spring of 2010, and the drought in North China and the Yellow River between last winter and this spring. When it comes to spring, the ear is a drought news, and often be labeled ”how many years do not