杨凌城区雨水资源利用潜力计算及其效益分析

Calculating the available rainwater resources and analyzing the benefits of their utilization in Yangling urban area

应用径流系数法分析了杨凌示范区城区雨水资源利用潜力。2007年可直接收集利用的雨水总量为123.91万m3,占该年杨凌城区总用水量的28.3%;可处理后回用的雨水总量为367.15万m3,但目前仅有占城区总面积1.98%的绿地利用雨水12.93万m3,其它均未予利用;预计到2020年,以枯水年计算,可直接收集利用的雨水总量为3 233.03万m3;可处理后回用的雨水潜力巨大。并进一步对杨凌城区实施雨水利用后可能产生的经济、社会和生态效益进行了评价分析。

Runoff coefficient method is used to analyze the potential amount of rainwater utilization in Yangling Agrieuhural Hi-tech Industries Demonstration Zone, and the results indicate that the total amount of recuperated rainwater from the urban area in 2007 is 1 239 100 m^3, accounting for 28.3 % of the zone＇s total water consumption. The total amount of runoff yield and possible water use is 3 671 500 m^3, but only 129 300 m^3 is now used for green land irrigation. It is predicted that by the year of 2020 year, the total amount of directly harvested rainwater is 32 330 300 m^3, showing a huge potential of rainwater utilization. Evaluation and analysis is also made of the possible economic and social benefits resulted from rainwater utilization.