We assess the potential financial benefits of rooftop rainwater harvesting (RWH) in Mexico City from the perspective of property owners and entrepreneurs. A bottom‐up approach was followed by evaluating RWH at individual buildings and aggregating the results to a borough/city level. We consider sector‐specific water demands, potable and nonpotable uses, and user‐specific water tariffs. We find that RWH is economically most beneficial for nondomestic users rather than for small domestic users, who are often the target of RWH interventions. Based on a net present value analysis, a potable RWH system is not favored for most domestic users under the current subsidized municipal water tariff structure. Our analysis only considers capital and maintenance expenses, and not other benefits related to increased access to water and reliability, or social benefits from a switch to a RWH system. If the initial capital expense for RWH is partly financed by transferring the water subsidy to an entrepreneur, then RWH becomes financially attractive for a wide range of domestic users. To improve water access in Mexico City, RWH is attractive in the most marginalized boroughs where water use is currently lower and precipitation is higher. For domestic users relying on trucked water, RWH can have great financial benefits. Our approach provides quantitative data with high spatial specificity, highlighting the places and types of users that would benefit most from RWH.

中文翻译：

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全市范围内对墨西哥城雨水收集的经济效益的评估

我们从业主和企业家的角度评估墨西哥城屋顶雨水收集（RWH）的潜在财务收益。自下而上的方法是评估各个建筑物的RWH，并将结果汇​​总到行政区/市一级。我们考虑特定行业的用水需求，饮用水和非饮用水用途以及用户特定的水价。我们发现，RWH在经济上最有利于非家庭用户，而不是小型家庭用户，后者通常是RWH干预的目标。根据净现值分析，在当前的市政水价补贴结构下，大多数家庭用户都不喜欢使用便携式RWH系统。我们的分析只考虑了资本和维护费用，没有考虑与增加供水和可靠性相关的其他收益，或改用RWH系统带来的社会利益。如果RWH的初始资本支出是通过将水补贴转移给企业家来部分融资的，那么RWH在财务上对许多家庭用户都具有吸引力。为了改善墨西哥城的水供应，RWH在最边缘化的自治市很有吸引力，那里的用水量目前较低，而降水量较高。对于依靠卡车运水的家庭用户而言，RWH可带来巨大的经济利益。我们的方法提供了具有高度空间特异性的定量数据，突出了从RWH中受益最大的用户的位置和类型。为了改善墨西哥城的水供应，RWH在最边缘化的自治市很有吸引力，那里的用水量目前较低，而降水量较高。对于依靠卡车运水的家庭用户而言，RWH可带来巨大的经济利益。我们的方法可提供具有高度空间特异性的定量数据，突出显示将从RWH中受益最多的用户的位置和类型。为了改善墨西哥城的水供应，RWH在最边缘化的自治市很有吸引力，那里的用水量目前较低，而降水量较高。对于依靠卡车运水的家庭用户而言，RWH可带来巨大的经济利益。我们的方法可提供具有高度空间特异性的定量数据，突出显示将从RWH中受益最多的用户的位置和类型。