水作为人类生存和发展不可替代的资源 ,是实现社会经济可持续发展的基础。从当前和２１世纪的发展看 ,洪涝灾害、干旱缺水、水生态环境恶化三大问题 ,特别是水资源短缺问题 ,将越来越成为制约我国农业和经济社会发展的重要因素。水资源状况形势严峻我国水资源总量２８０００多 As an irreplaceable resource for the survival and development of mankind, water is the basis for achieving sustainable social and economic development. From the current and the 21st century’s development, the three major issues of floods, drought and water shortage, and the deterioration of aquatic environment, especially the problem of water shortage, will increasingly become an important factor that restricts China’s agriculture and economic and social development. Water situation is grim China’s total water resources more than 28,000