浙江省地处东南沿海，光热资源丰富，雨量充沛，应当说发展农业条件较优越。但由于雨量分布不匀，每年7，8，9月伏旱，10，11月秋旱和12月以及次年4月冬旱为浙江省3个旱期，跨越时间约半年，而雨量仅占全年的30％左右。另外，浙江省境内山势陡峻，水系源短流急，地表径流大多集 Zhejiang Province is located in the southeast coast, rich in light and heat resources, abundant rainfall, it should be said that the development of agricultural conditions superior. However, due to the uneven distribution of rainfall, the annual drought in July, August and September, the autumn drought in November and November and the winter drought in December and April next year were three dry periods in Zhejiang Province, spanning about six months, while the rainfall only accounted for About 30% of the year. In addition, the steep mountainous areas in Zhejiang Province, the short source of short-term water system, surface runoff mostly set