The growing population has resulted in the need for new alternatives that guarantee water supply to the population. Among the alternatives, there is the individual system for capturing and utilizing rainwater. The objective of this article was to test a municipal policy that makes it mandatory to implement the system and to attest how much it can optimize the current public water supply system through the construction of a simulation model. The simulation considered the policy implementation in one city, and the analysis of the results showed the effectiveness of the policy, which can optimize an average of 114,275.00 m³ in 2030, with demand reduction. However, it was verified that the isolated initiative is not sufficient to solve the problem of supply and demand. There is a need to expand the implementation of the policy to other cities supplied by the studied macro public system. Also, if the current management practices remain, the projection is that the current system will not guarantee supply for the coming years, mainly due to the strong impact of tourism on demand, needing new sources of supply, techniques and management strategies.

人口的增长导致需要新的替代方法来保证人口的供水。在替代方案中，有用于收集和利用雨水的单独系统。本文的目的是测试一项市政政策，该政策强制实施该系统，并通过模拟模型的构建证明其可以优化当前的公共供水系统。模拟考虑了一个城市的政策实施，结果分析表明该政策是有效的，可以平均优化114,275.00 m ³到2030年，需求减少。但是，事实证明，孤立的倡议不足以解决供需问题。有必要将政策的执行范围扩展到所研究的宏观公共系统提供的其他城市。同样，如果保留当前的管理做法，则可以预测，当前的系统将无法保证未来几年的供应，这主要是由于旅游业对需求的强烈影响，需要新的供应来源，技术和管理策略。