This publication presents a methodology for the evaluation of the water footprint of urban renewal projects. The indirect water footprint is obtained by adding together the embodied or virtual water of the materials incorporated in the 12-month project, while the direct footprint is mainly due to the green areas and rainwater collection system over its 40-year life span. The methodology, originally defined for the agricultural sector, is adapted to an urban system that includes gardens and sustainable urban drainage systems. In an innovative way, the present work analyses the amortisation of the indirect water footprint of the construction products by improvements in the city water cycle. The project involves street renewal with water-sensitive criteria, with five green areas, and road and pavement construction. The methodology identifies changes in garden designs, soil drainage, and rainwater-collecting systems in terms of blue, green, and grey water footprints. Five scenarios of a project in Seville, Spain are studied. The indirect water footprint of the project is 2.6 times higher than that in a standard project, but, due to annual savings of 65% in its direct water footprint, the breakeven point is reached in the 10th year.

本出版物介绍了一种评估城市更新项目水足迹的方法。间接水足迹是通过将包含在 12 个月项目中的材料的实体水或虚拟水相加得到的，而直接水足迹主要是由于绿地和雨水收集系统超过 40 年的使用寿命。该方法最初是为农业部门定义的，适用于包括花园和可持续城市排水系统在内的城市系统。本工作以创新的方式分析了通过改善城市水循环来摊销建筑产品的间接水足迹。该项目涉及具有水敏感标准的街道更新、五个绿化区域以及道路和人行道建设。该方法根据蓝色、绿色和灰色水足迹识别花园设计、土壤排水和雨水收集系统的变化。研究了西班牙塞维利亚的一个项目的五个场景。该项目的间接水足迹是标准项目的2.6倍，但由于其直接水足迹每年可节省65%，第10年达到盈亏平衡点。