镇江市雨水利用示范工程水量平衡计算及效益分析

The Water Balance Calculation and Benefit Analysis of Rainwater Utilization Demonstration Project in Zhenjiang

针对镇江市某医院雨水利用示范工程,结合该医院绿化和景观用水状况及过去20年的日降雨量、蒸发量资料,建立相应的水量平衡方程,对区域内雨水利用系统收集和利用的雨水量进行核算。结果表明,示范工程雨水收集量能够满足该区域内绿化用水、道路喷洒用水、水面蒸发和其他损失的水量,不需要补充自来水。该系统雨水利用率达到81%,每年可节约自来水12 526 m3。经济效益分析表明,系统运行6年即可收回基建投资。

Based on the present conditions of the greening and landscape water consumption, along with daily precipitation and evaporation data of the last 20 years, the corresponding balance equation of water volume is established for the rainwater harvesting demonstration project in a hospital of Zhenjiang, to calculate the amount of rainwater,that has been collected and utilized in this system. The results reveals that the collected water of this design can meet the water demands of greening, road spraying, surface evaporation and other kinds of water loss. The water saving efficiency of this system can reach as high as 81%, and 12 526 m3 of tap water can be saved every year. The economic efficiency analysis indicates that the construction investment of the system can be recovered in six years running .