大连是国家园林城市,以城市建设和城市绿化闻名全国,随着全球环境五百强的当选,大连的绿化水平将跃上新的台阶。但是大连是一个严重缺水、干旱少雨的城市,近3年平均降雨350毫米,每天需要调水100万吨才能维持正常运转,而且这一数字每年都以10％的比例递增。大连现有绿地面积1700多万平方米,正常年份每年需人工浇水近百万吨。由于近几年严重干旱少雨,绿地需水量大增,绿地与人争水的矛盾就日渐突出。城市绿化是否可持续发展,关键在于淡水资源供应。因此,如何充分利用现有淡水资源,进一步搞好城市绿化工作,将是我们必须面对的重大课题。 充分利用自然降水,提高水资源利用率大连地区年平均降雨500毫米左右,但近3年严重干旱,平均降雨只有350毫米左右,以此计算,市区 Dalian is a national garden city famous for urban construction and urban greening. With the election of the global top 500, Dalian’s greening level will step onto a new level. However, Dalian is a severely water-short and dry city. It has average rainfall of 350 millimeters over the past three years and needs 1 million tons of water per day to maintain its normal operation. This figure is increasing at a rate of 10% every year. Dalian has an area of ​​more than 17 million square meters of green land, which requires about 1 million tons of artificial water for normal years. Due to the serious drought and the lack of rain in recent years, the demand for green space has risen sharply, and the contradiction between green space and people’s vying for water has become increasingly prominent. Urban greening is the sustainable development, the key is the supply of fresh water resources. Therefore, how to make full use of existing freshwater resources and further improve urban greening will be an important issue that we must face. Make Full Use of Natural Precipitation and Increase Utilization of Water Resources Average annual rainfall in Dalian is about 500 millimeters. However, in the past three years there was a serious drought with an average rainfall of only about 350 millimeters. Based on this calculation,