**Paula Beceiro 1,2,\*, Rita Salgado Brito <sup>1</sup> and Ana Galvão <sup>2</sup>**


Received: 31 January 2020; Accepted: 16 March 2020; Published: 24 March 2020

**Abstract:** Urban waters represent a crucial component for the enhancement of urban resilience due to their importance in cities. Nature-based solutions (NBS) have emerged as sustainable solutions to contribute to urban resilience in order to meet the challenges of climate change. In order to promote the use of NBS for increasing urban resilience, tools that demonstrate the value of this type of solutions over the long-term are required. A performance assessment system provides an adequate basis for demonstrating this value, as well as for diagnosing the current city situation, selecting and monitoring the implementation of solutions. Regarding NBS management, some assessment approaches have been published, focusing on assessing the effectiveness of NBS in the face of climate change and supporting their design and impact assessment. Nevertheless, an integrated approach to assess the NBS contribution for urban resilience has not been published. This paper presents a comprehensive resilience assessment framework (RAF) to evaluate the NBS contribution for urban resilience, focused on solutions for stormwater management and control. Furthermore, details on stakeholders' validation, with focus on the metrics' relevance and applicability to cities, is also presented.

**Keywords:** Ecosystem Services (ES); Nature-Based Solutions (NBS); Resilience Assessment Framework (RAF); stakeholders' validation; stormwater management and control; urban resilience
