Practical Guide to Implementing Green-Gray Infrastructure describes tools, experiences, and techniques to implementing green-gray infrastructure to increase the resilience of vulnerable communities. The guide provides information about many aspects of green-gray infrastructure, including identifying, funding, financing, planning, designing, constructing, and monitoring green-gray infrastructure projects. These tools and case studies have been collected based on experiences of members from the Global Green-Gray Community of Practice. The Practical Guide is intended to be used as a resource for selecting, funding, designing, and constructing green-gray infrastructure projects, as well as a tool for education and outreach.